756PRO3.pdf. Instruction.pdf. Installer. W_README.txt

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1 GUID FOR D ) OMPOSITION I_PRO PRO.pdf FY Aformat.pdf Aformat.pdf Instruction.pdf Unitparts.pdf Installer areng.exe W_RADM.txt ) DSRIPTION PRO.pdf PRO.pdf is a service manual for I-PROIII and including all service information in this D. This file is mainly used for viewing on the computer display and checking page order to make printed service manual. Or when you want to find a component, you can find very fast using FIND function (except oard layout). Aformat.pdf Aformat.pdf consists of A format pages (oard layout, Mechanical parts and disassembly, and etc.) in PRO.pdf. This file is used for printing out A format pages. Aformat.pdf Aformat.pdf consists of A format pages (ircuit description, Adjustment procedures, Parts list, and etc.) in PRO.pdf. This file is used for printing out A format pages. Instruction.pdf Instruction.pdf is a instruction manual for I-PROIII. This file is exactly same as supplying instruction manual withproduct and consists of all A format pages. If you have A format printer, you can print out and make brand new instruction manual any time you want. Also this fi le is very helpful when you want to change or set product conditionfor adjustment or else. Unitparts.pdf Unitparts.pdf is assemble unit information for I-PROIII. This information for authorized dis-tributor/dealer only. ecause we (IOM I.) don t sell assemble unit to general. areng.exe areng.exe is an installation program of Adobe Acrobat Reader. (nglish version) for Microsoft Windows //Me/NT//XP users.

2 W_RADM.txt W_RADM.txt is a readme text about this service manual for Windows user that not installed Acrobat Reader yet. ========================================================================================= Icom, Icom Inc. and Icom logo are registered trademarks of Icom Incorporated (Japan) in the United states, the United Kingdom, Germany, France, Spain, Russia and/or other countries. Acrobat Reader opyright - Adobe Systems Incorporated. All rights reserved. Adobe, the Adobe logo, Acrobat, and the Acrobat logo are trademarks of Adobe Systems Incorporated. Microsoft and Windows are registered trademarks of Microsoft orporation in the U.S.A. and other countries. opyright Icom Inc. =========================================================================================

3 SRVI MANUAL HF/MHz ALL MOD TRANSIVR

4 INTRODUTION This service manual describes the latest service information for the I-PROIII HF/MHz ALL MOD TRANSIV- R. VR.NO. SYMOL VRSION # # # # # # # USA UR FRA UK ITA KOR SP U.S.A. urope France United Kingdom Italy Korea Spain DANGR NVR connect the transceiver to an A outlet or to a D power supply that uses more than V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than dm ( mw) to the antenna connector. This could damage the transceiver s front end. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. ORDRING PARTS e sure to include the following four points when ordering replacement parts:. -digit order numbers. omponent part number and name. quipment model name and unit name. Quantity required <SL ORDR> S.I NJMM I-PROIII MAIN-A UNIT pieces Screw ih M ZK I-PROIII Top cover pieces Addresses are provided on the inside back cover for your convenience. RPAIR NOTS. Make sure a problem is internal before disassembling the transceiver.. DO NOT open the transceiver until the transceiver is disconnected from its power source.. DO NOT force any of the variable components. Turn them slowly and smoothly.. DO NOT short any circuits or electronic parts. An insulated tuning tool MUST be used for all adjustments.. DO NOT keep power ON for a long time when the transceiver is defective.. DO NOT transmit power into a signal generator or a sweep generator.. ALWAYS connect a d to d attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment.. RAD the instructions of test equipment thoroughly before connecting equipment to the transceiver. Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

5 TAL OF ONTNTS STION SPIFIATIONS STION INSID VIWS STION IRUIT DSRIPTION STION ADJUSTMNT PRODURS STION PARTS LIST STION MHANIAL PARTS AND DISASSMLY STION SMI-ONDUTOR INFORMATION STION OARD LAYOUTS - DISPLAY OARD MOD OARD PHON OARD KY OARD TN-KY OARD PT OARD RIT OARD MI OARD MMORY OARD MAIN-A UNIT DSP-A OARD RF- UNIT PF-A OARD PR OARD PLL UNIT PA UNIT FILTR-A UNIT TRL-A UNIT TUNR-A OARD STION LOK DIAGRAM STION VOLTAG DIAGRAMS - FRONT UNIT DSP-A OARD TUNR-A, MMORY OARDS AND TRL-A UNIT MAIN-A UNIT PLL UNIT PA AND FILTR-A UNITS PF-A, PR OARDS AND RF- UNIT

6 STION SPIFIATIONS GNRAL Frequency coverage: Receive.. MHz*, * Transmit.. MHz*.. MHz*.,.,.,.,. MHz*.. MHz*.. MHz*.. MHz*.. MHz*.. MHz*.. MHz*.. MHz*.. MHz* * Some frequency bands are not guaranteed. * Depending on version. * [USA] only. Mode : US, LS, W, RTTY, AM, FM Number of memory channels : ( regular, scan edges) Antenna connector : SO- ( Ω) phono jack (RA; Ω) Usable temp. range : to + ( F to F) Frequency stability : Less than ±. ppm from min. after power ON. ( to + ; F to F) Freq. resolution : Hz Power supply requirement:. V D ±% (negative ground) urrent drain : Transmit max. power A Receive stand-by. A (typical) max. audio. A (typical) Dimensions : (W) (H) (D) mm (proj. not included) ; (W) (H) (D) in Weight (approx.) :. kg ( lb oz) A connector : -pin DIN connector A connector : -pin DIN connector I-V connector : -conductor.(d) mm ( ") Display : -inch (diagonal) TFT color LD TRANSMITTR Output power : SS/W/RTTY/FM W AM W Modulation system : SS PSN modulation AM Low power modulation FM Phase modulation Spurious emission : Less than d (HF bands) Less than d ( MHz band) arrier suppression : More than d Unwanted sideband suppression: More than d TX variable range : ±. khz Mic. connector : -pin connector ( Ω) L-KY connector: -conductor.(d) mm ( ") KY connector : -conductor.(d) mm ( ") SND connector : Phono jack (RA) AL connector : Phono jack (RA) RIVR Receive system : Triple-conversion superheterodyne system Intermediate frequencies: st IF. MHz nd IF khz rd IF khz Sensitivity : SS, W, RTTY (at. khz bandwidth).. MHz*. µv ( d S/N).. MHz*. µv ( d S/N) AM (at. khz bandwidth).. MHz µv ( d S/N).. MHz*. µv ( d S/N).. MHz*. µv ( d S/N) FM (at khz bandwidth).. MHz*. µv ( d SINAD).. MHz*. µv ( d SINAD) * Pre-amp ON * Pre-amp ON Squelch sensitivity : (Pre-amp OFF) SS/W/RTTY Less than. µv FM Less than. µv Selectivity : SS/RTTY (at. khz bandwidth) More than. khz/ d Less than. khz/ d W (at Hz bandwidth) More than Hz/ d Less than Hz/ d AM (at khz bandwidth) More than. khz/ d Less than. khz/ d FM (at khz bandwidth) More than khz/ d Less than khz/ d Spurious and image rejection ratio: More than d (except IF through in MHz band) RIT variable range : ±. khz Audio output power : More than. W at % distortion (at. V D) with an Ω load PHONS connector: -conductor.(d) mm ( ") XT SP connector : -conductor.(d) mm ( ") Ω ANTNNA TUNR Matching impedance range: HF bands. to Ω unbalanced* MHz band to Ω unbalanced* * Less than VSWR : * Less than VSWR.: Minimum operating input power: W Tuning accuracy : VSWR.: or less Insertion loss : Less than. d (after tuning) All stated specifications are subject to change without notice or obligation. -

7 STION INSID VIWS TOP VIW PA unit Power amplifiers (Q, Q: S ) ooling Fan fan FILTR-A unit TUNR-A unit Antenna tuner PU (I: MM-FP) Fan control circuit Q, Q: S Q, Q: S Drive amplifier circuit (Q, Q: S ) Voltage regulator I: TAF I: TAS I: TAT ommon filter (L: LR-) ommon filter (L: LR-) TRL-A unit urrent transformer (L: LR-) -MOS I (I: TAF) -

8 OTTOM VIW PLL unit LO PLL I (I, I: LMXTM) VO- circuit VO-A circuit SLO PLL I (I: LM) LO DDS I (I, I: S-A) LO/SLO DDS I (I, I: S-) Reference frequency oscillator (X: R-..MHz) MAIN-A unit LD contorller (I: SDFA) MAIN PU (I: HDFF) DSP-A board RF- unit PF-A board PR board TX st mixer (D: HSWS) FM IF I (I: TAFN) RX st mixer circuit RX nd mixer (D: HSWS) TX nd mixer (D: HSWS) Noise blanker circuit RX rd mixer (I: TWFU) TX rd mixer (I: NJMV) -

9 STION IRUIT DSRIPTION - RIVR IRUIT -- RF SWITHING IRUIT (TRL-A AND RF- UNITS) The RF switching circuit leads receive signals to bandpass fi lters from an antenna connector while receiving. However, the circuit leads the signal from the RF power amplifier to the antenna connector while transmitting. RF signals from [ANT ] or [ANT ] pass through the antenna selector (RL), transmit/receive switching relays (RL, RL, RL), and low-pass fi lter (L, L,, ), and are then applied to the RF- unit via J (RF- unit). The signals from the TRL-A unit either bypass or pass through the d (RF- unit, R, R, R, RL) and/or d (RF- unit, R, R, R, RL) attenuators via the antenna selector (RL). y selecting the attenuators, (bypass),, and d attenuations are obtained. The signals are then applied to the RF fi lters. When the [RX ANT] is selected, the RF signals are passed through the low-pass filter (RF- unit, L, L, ), then applied to the antenna selector (RF- unit, RL). -- RF ANDPASS FILTR IRUIT (RF- UNIT AND PF-A OARD) RF bandpass fi lters pass only the desired band signals and suppress any undesired band signals. The RF circuit has bandpass fi lters and low-pass fi lter. ().. MHz (RF- UNIT) The signals pass through the low-pass filter (L L,, ), attenuator (R R), and are then applied to the RF amplifi ers (Q, Q). (). MHz (RF- UNIT AND PF-A OARD) The signals pass through the band switch (D) and highpass filter (L L,,, ) to suppress excessively strong signals below. MHz. The fi ltered signals are applied to one of bandpass fi lters on the table at right above, and then applied to or bypassed the preamplifi er circuit. Used RF filter and ontrol Input ontrol Input and signal diode signal diode.. MHz D MHz D. MHz *D MHz D MHz *D MHz D MHz *D MHz W D MHz *D MHz D MHz *D MHz W D MHz D *: On the PF-A board -- PR-LIFIR IRUITS (PRI OARD) The I-PROIII has gain levels of pre-amplifi er circuits. One has d gain for the. MHz bands and the other one has d gain for the upper MHz bands. When the [P.] switch is set to [P. ] or [P. ], the signals are applied to the pre-amplifier (Q, Q) or pre-amplifi er (Q) circuit, respectively. Preamplifi ed or bypassed signals are applied to the RF amplifi er circuits (RF- unit; Q, Q or Q, Q). -- RF LIFIR AND ST MIXR IRUITS (RF- UNIT) The st mixer circuit mixes the receive signals with the st LO signal to convert the receive signal frequencies into a. MHz st IF signal. The I-PROIII has two st mixer circuits for the dualwatch function. The signals from the pre-amplifier circuit, or signals which bypass the pre-amplifi ers, are divided at L, L. ach signal is applied to a MHz cut-off low-pass fi lter, RF amplifi er (Q, Q for sub readout or Q, Q for main readout) and then to a st mixer (Q Q sub readout or Q Q for main readout) to convert the frequency into the. MHz st IF signal. ach st LO signal (.. MHz) from the PLL unit via J or J. The LO signals are amplifi ed at the LO amplifi er (Q; sub or Q; main), fi ltered by a lowpass fi lter, and then applied to each st mixer. Receiver construction LPF or PF.. MHz st mixer Q Q st LO FI rystal filter. MHz st mixer A Q Q st LO A nd mixer D nd LO. MHz RF- UNIT FI eramic filter khz MAIN-A UNIT rd mixer I khz DSP-A board rd LO khz to squelch gate (I) -

10 -- ST IF IRUIT (RF- UNIT) The st IF circuit filters and amplifies the st IF signal. The st IF signal combined at L and is then applied to a MF (Monolithic rystal Filter; FI) to suppress out-ofband signals. The st IF signal level is adjusted at the PIN attenuators (D, D, D; sub or D, D, D for main) controlled by the [AL] controller for the dualwatch function. The signal is applied to the st IF amplifier (Q; sub or Q; main) and then combined at L. The combined signal is pass through the MFs (FI) and is then applied to the st IF amplifier (Q). The amplified signal is then applied to the nd mixer circuit. Some D voltage from the noise detector circuit is fed back to the noise amplifiers (Q, Q) via the D amplifiers (Q, Q). The D amplifiers function as an AG circuit to reduce average noise. Therefore, the noise blanker function shuts off pulse-type noise only. -- ND IF IRUIT (MAIN-A UNIT) The nd IF circuit amplifies and filters the nd IF signal, and applies the nd IF signal to the rd mixer circuit. The nd IF signal from the noise blanker gate (D, D) is amplified at the nd IF amplifier (Q) and passed through the ceramic filter (FI). The filtered signal is applied to the rd mixer circuit. -- ND MIXR IRUIT (RF- UNIT) The nd mixer circuit mixes the st IF signal and nd LO signal (. MHz) for conversion into the nd IF signal. The st IF signal from the st IF amplifier (Q) is converted into a khz nd IF signal at the nd mixer circuit (D). The nd IF signal is applied to the noise blanker gate (MAIN-A unit) via the J. -- NOIS LANKR IRUIT (MAIN-A UNIT) The noise blanker circuit detects pulse-type noise, and turns OFF the signal line when the noise appears. The nd IF signal from the RF- unit is applied to the noise blanker gate (D, D). A portion of the nd IF signal is amplified at the noise amplifiers (Q Q, Q), and is then detected at the noise detector (D) to convert the noise components to D voltages. The signal is then applied to the noise blanker switch (Q, Q). At the moment the detected voltage exceeds Q s threshold level, Q outputs a blanking signal to close the noise blanker gate (D, D). The PLL unlock signal are also applied to Q, to control the noise blanker gate. -- RD MIXR AND RD IF IRUITS (MAIN-A UNIT) The rd mixer circuit mixes the nd IF signal and the rd LO signal to obtain the rd IF ( khz) signal. The nd IF signal from the ceramic filter (FI) is applied to the rd mixer circuit (I, pin ). The rd LO signal from the PLL unit is applied to the rd mixer (I, pin ). The rd IF signal is output from pin. The rd IF signal is passed through the low-pass filter (Ia) and amplified at the rd IF amplifier (Ib). The amplified signal is then applied to the DSP-A board via J (pin ) as DRIF signal. -- DSP RIVR IRUIT (DSP-A OARD) The DSP (Digital Signal Processor) circuit enables digital IF filter, digital noise reduction, digital PSN (Phase Shift Network)/Low Power/Phase demodulation, digital automatic notch, and etc. The khz rd IF signal from the rd IF amplifier (MAIN-A unit, Ib) is amplified at the differential amplifiers (Ia/b) after being passed through the T/R switch (I), and is then applied to the A/D converter (I). DSP receiver circuit rd IF signal DRIF khz I TXS signal Ib/a Differential converter I A/D converter I Level converter I DSP I I Level converter I D/A converter T/R switch MAIN-A unit DSP-A board Ix Iz MAIN-A unit I Iy Ia Ia I Mixer DRAF LPF HPF AF amplifier signals TXS signal TXS signal -

11 The converted signal is changed from a V level signal to a. V signal in the level converter (I), and is then applied to the DSP I (I) for khz digital IF filter, demodulation, automatic notch and noise reduction, etc. The output signal from the DSP I (I) is changed from a. V level signal to a V level signal in the level converter (I), and is applied to the D/A converter (I) to convert into the analog audio signals. The converted audio signals are passed through the active filter (Ia), AF amplifier (Ib), analog switches (I, pins, and pins, ) then applied to the low-pass filter (I, pins, ). The filtered signals are passed through the analog switches (I, pins, and I, pins, ), high-pass filter (IA) and mixer amplifier (IA), and then applied to the MAIN-A unit via J (pin ) as the DRAF signal. -- TWIN PT IRUIT (DSP-A OARD) General PT (Passband Tuning) circuit shifts the center frequency of IF signal to electronically narrow the passband width. The I-PROIII uses the DSP circuit for the digital PT function and actually shifts the both lower and higher passbands of rd IF filter within ±. khz. The twin PT circuit in DSP I (I) controlled by the [TWIN PT] controller adjusts the rd IF passband width and rejects interference. -- AG IRUIT (DSP-A OARD) The AG (Automatic Gain ontrol) circuit reduces IF amplifier gain and attenuates IF signal to keep the audio output at a constant level. The receiver gain is determined by the voltage on the AG line (I, pin ). The D/A converter (I) for AG supplies control voltage to the AG line and sets the receiver gain with the [RF/SQL] control. The rd IF signal from the level converter (I) is detected at the AG detector section in DSP I (I), and is applied to the D/A converter for AG via the level converter (I). The AG voltage is amplified at the buffer amplifier (Ib), and is then applied to the MAIN-A unit via J (pin ) to control the AG line. When receiving strong signals, the AG voltage decreases via the buffer amplifier (Ib). As the AG voltage is used for the bias voltage of the IF amplifier (RF- unit; Q), and IF amplifier gain is decreased. -- S-MTR IRUIT (MAIN-A UNIT) The S-meter circuit indicates the relative received signal strength while receiving by utilizing the AG voltage which changes depending on the received signal strength. A portion of the AG bias voltage from the DSP-A board is applied to the differential amplifier (Ia, pin ) where the difference between the AG and reference voltage is detected. The detected voltage is passed through the analog switch (I, pins, ) as the SML signal and applied to the main PU (I, pin ) to activate the S/RF meter via the sub PU (DISPLAY board, I). -- SQULH IRUIT (MAIN-A UNIT) The squelch circuit mutes audio output when the S-meter signal is lower than the [RF/SQL] setting level. The S-meter signal is applied to the main PU (I, pin ) and is compared with the threshold level set by the [RF/SQL] control. The [RF/SQL] setting signal is applied to the main PU via the sub PU (DISPLAY board; I, pin ). The main PU analyzes the compared signal and outputs control signal to the squelch gate (I, pin ) via the interface I (I, pin ) to open or close the squelch as the SQLS signal. -- AF LIFIR IRUIT (MAIN-A UNIT) The AF amplifier amplifies the audio signals to a suitable driving level for the speaker. The AF signals (DRAF) from the DSP-A board are passed through the squelch gate (I, pins, ) and amplified at the AF amplifier section of I (pins, ), and volume is controlled by the AFGV signal at the VA section (pins ). The volume controlled AF signals are passed through the AF mute gate (I, pins, ), then applied to the AF power amplifier (I, pins, ). The amplified audio signals are passed through the SP mute switch (RL) and [XT SP] jack then applied to the internal speaker when no plug is connected to the jack. The AF mute gate is controlled by the [AF] control via the sub and main PUs. When headphones are connected, the SP mute signal from the main PU (I, pin ) is applied to the SP mute switch (RL) via the US driver (I, pins, ) as the SPS signal. AF amplifier circuit DRAF I SQLS signal I VA Squelch gate AFGV signal MAIN-A unit AFMS signal I RL I AF power amp. Mute switch SPS signal [PHONS] [XT SP] DSP-A board Int. speaker -

12 - TRANSMITTR IRUITS -- MIROPHON LIFIR IRUIT (MAIN-A UNIT) The microphone amplifier circuit amplifies microphone audio signals to a level needed for the DSP circuit. Audio signals from the [MI] connector (MI board; J, pin ) are amplified at the audio amplifier section in I (pins, ) via the analog switch (I, pins, ), then applied to the buffer amplifier section (I, pin ) and VA section. The gain controlled signals are output from (I, pin ) and passed through the analog switch (I, pins, ) and then applied to the DSP circuit via J (pin ) as the DTAF signal. The VA section in I (pin ) controls microphone input gain according to the [MI GAIN] control level using the MIGV signal coming from the main PU via the I/O expander (I, pin ). -- VOX IRUIT (MAIN-A UNIT) The VOX (Voice-Operated Transmission) circuit sets transmitting conditions according to voice input. A portion of the audio signals from the VA section (I, pin ) is applied to the AF amplifier (Ib, pins, ), and then applied to the main PU (I, pin ) after passing through the analog switch (I, pins, ) as the VOXL signal. The VOGV signal is applied to the VA section in I (pin ) from the main PU via the I/O expander (I, pin ) to adjust VOX actionable sensitivity. This is controlled by the VOX gain set in the VOX ST mode. -- DSP TRANSMITTR IRUIT (DSP-A OARD) The microphone audio signals from the MAIN-A unit via the DTAF line are applied to the analog switch (I, pin ) and output from pin or to the each modulation circuits. () When SS mode The audio signals from the analog switch (I, pin ) are amplified at the limiter amplifier (Ib) and applied to the low-pass filter (Ic/d) to limit the transmit passband width. The filtered signals are then applied to the differential amplifiers (Ia/b) via the analog switch (I, pins, ) and T/R switch (I, pins, ). () When FM/AM modes The audio signals from the analog switch (I, pin ) are applied to the modulation adjustment pots (R: FM mode, R: AM mode) via the limiter amplifier, preemphasis circuit (only FM mode) and splatter filter consist of I. The level adjusted signals are applied to the differential amplifiers (Ia/b) after being passed through the analog switch (I, pins,, ) and T/R switch (I pins, ). The pre-emphasis circuit is cancelled by Q, Q, Q on AM mode. The amplified signals at the differential amplifiers (Ia/ b) are applied to the A/D converter (I pins, ). The converted signals are changed from V level signals to. V level signals in the level converter (I). The converted signals are applied to the DSP I (I) and modulated at the DSP I to produce the khz transmitter IF signal. The modulated IF signal from the DSP I is changed from a. V signal to a V signal in the level converter (I), and is applied to the D/A converter (I) to convert into the analog IF signal. The converted IF signal is passed through the active filter (Ia), buffer amplifier (Ib), analog switch (I, pins, ) then applied to the low-pass filter (Ic/d). The filtered signal is applied to the MAIN-A unit via J (pin ) as the DTIF signal. When SS or RTTY mode, a portion of the filtered signal from the low-pass filter (Ic/d) is amplified at the IF and buffer amplifiers (Ia/b) and is applied to the transmit monitor circuit for the monitor function. DSP Transmitter circuit AF signal DTAF Iz Mode switch SS mode FM/AM mode MODS signal Ib Limitter Ia Limitter Ic/d LPF Ib LPF I Ix T/R switch Mode switch TXS signal Ia/b Differential converter MAIN-A unit I A/D converter DSP-A board I Level converter I DSP I I Level converter I Ix D/A converter TXS signal Id/c LPF DTIF khz IF MAIN-A unit -

13 -- SPH OMPRSSOR IRUIT (DSP-A OARD) The speech compressor compresses the transmitter audio input signals to increase the average output level (average talk power). When the speech compressor function is ON, the level shifted signal from the level converter (I) is applied to the DSP I (I) and compressed at the DSP I to obtain an average audio level. At the same time, the compressed signals are modulated at the DSP I and applied to the level converter (I). -- IF LIFIR AND MIXR IRUITS (MAIN-A AND RF- UNITS) The modulated rd IF signal from the DSP-A board (DTIF: khz) is applied to the rd mixer circuit (MAIN-A unit; I, pin ). The applied rd IF signal is mixed with the rd LO signal from the DDS circuit (PLL unit; I) to produce a khz nd IF signal. The nd IF signal is output from (MAIN-A; I, pin ) and amplified at the IF amplifier (MAIN-A unit; Q). The amplified signal is passed through the ceramic bandpass filter (MAIN-A unit; FI: FM/AM modes, FI: other modes) for unwanted signals are suppressed. The filtered nd IF signal is amplified at IF amplifier (MAIN-A unit; Q) and applied to the nd mixer circuit on the RF- unit via J (MAIN-A unit). The nd IF signal is mixed with the MHz nd LO signal, coming from the PLL unit, at the nd mixer circuit (RF- unit; D) to obtain a. MHz st IF signal. The st IF signal is passed through a MFs (RF- unit; FI) to cut-off the undesired signals then amplified at the IF amplifier (RF- unit; Q) via the T/R switch (RF- unit; D). The amplified st IF signal is applied to the st IF mixer circuit (RF- unit; D). The operating (transmitting) frequency is produced at the st IF mixer circuit (RF- unit; D) by mixing the st IF and st LO signals. The mixed signal is then applied to the RF circuit. -- RF IRUIT (RF- AND PA UNITS) The RF circuit amplifies operating (transmitting) frequency to obtain W of RF output. The signal from the st IF mixer (RF- unit; D) is passed through the low-pass filter (RF- unit; L, L, ) and amplified at the RF amplifier (RF- unit; I). The amplified signal is amplified again at the wide-band YGR amplifier (RF- unit, I) after passing through one of bandpass (Refer to page - for bandpass filters used) and high-pass filters, and is then applied to the PA unit via J (RF- unit). The signal applied from the RF- unit is amplified at the pre-drive (Q), drive (Q, Q) and power amplifiers (Q, Q) in sequence to obtain a stable W of RF output power. The amplified signal is applied to one of low-pass filters in the FILTR-A unit. -- LOW-PASS FILTR IRUIT (FILTR-A UNIT) The low-pass filter circuit contains hebyschev low-pass filters to suppress the higher harmonic components. The amplified signal from the PA unit is applied to one of low-pass filters, which is selected by the I/O expander (TRL-A unit, I) via the buffer amplifier (TRL-A unit; I). The filtered signal is then applied to one of antenna connectors via the TRL-A unit. -- AL IRUIT (MAIN-A UNIT) The AL (Automatic Level ontrol) circuit controls the gain of IF amplifiers in order for the transceiver to output a constant RF power set by the [RF POWR] control even when the supplied voltage shifts, and etc. The RF power level is detected at one of the AP detector circuits (TRL-A unit; D) to be converted into D voltage and applied to the MAIN-A unit as the FORV signal. The FORV signal from the TRL-A unit is applied to the comparator (Ib, pins, ). The POV signal, controlled by the [RF POWR] control via the I/O expander (I, pin ), is also applied to the other input (Ib, pin ) for reference. The compared signal is output from pin and applied to the IF amplifiers in the MAIN-A (Q) and RF- (Q) units to control amplifying gain. Transmitter construction I Ix VA DTAF MI I MISL signal MOSL signal DSP-A board khz IF I DTIF khz rd LO ( khz) FM/AM modes other modes FI eramic filter FI eramic filter MAIN-A UNIT D. khz nd LO (. MHz) FI rystal filter D st LO (.. MHz) LPF RF- UNIT PFs PAIN PA UNIT -

14 When the FORV signal exceeds the POV voltage, AL bias voltage from the comparator (Ib) controls the IF amplifiers (Q). This adjusts the output power to a specified level from the [RF POWR] control until the FORV and POV voltages are equalized. In AM mode, the comparator operates as an averaging AL amplifier. Q turns ON and the POV voltage is shifted for W AM output power (maximum) through R. The AL bias voltage is also applied to the AL meter amplifier (Ia, pins, ) to obtain an AL meter signal (ALL). The amplified signal is passed through the analog switch (I, pins, ) and applied to the main PU (I, pin ) to drive the S/RF meter via the sub PU (I) on the DISPLAY board. An external AL input from the [AL] jack or [A] sockets is applied to the buffer amplifier (Q). xternal AL operation is identical to that of the internal AL. The FORV signal is also applied to the power meter amplifier (Ia, pins, ). The amplified signal is passed through the analog switch (I, pins, ) as an FORL signal and applied to the main PU (I, pin ) to drive the S/RF meter when the power meter is selected. -- AP IRUIT (MAIN-A UNIT) The AP (Automatic Power ontrol) circuit protects the power amplifiers on the PA unit from high SWR and excessive current. The reflected wave signal appears and increases when the connected antenna is mismatched to Ω. The AP detector circuit (TRL-A unit; D and L) detects the reflected signal, and applies it to the AP circuit (Ic, pins, ) as RFV signal. When the RFV signal level increases, the AP circuit decreases the AL voltage to activate the AP. For the current AP, the power transistor current is obtained by detecting the voltages (IH and IL) which appear at both terminals of the current detector (PA unit; R). The detected voltages are applied to the differential amplifier (Id, pins ). When the current of transistors is increased, the amplifier controls the AL line to prevent excessive current flow. A portion of the RFV signal is applied to the SWR meter amplifier (Ib, pins, ). The amplified signal is passed through the analog switch (I, pins, ) as an RFL signal and applied to the main PU (I, pin ) to drive the S/RF meter when the SWR meter is selected. The thermistor (R) detects the temperature of the final amplifier (Q), and activates Q and Q to accelerate the cooling fan when the detected temperature exceeds ( F). The cooling fan rotates at high speed at ( F) or more. The thermistor keeps the cooling fan rotating even while receiving until the Q temperature drops to ( F) or below. -- MONITOR IRUIT (DSP-A OARD AND MAIN-A UNIT) The microphone audio signals can be monitored to check voice characteristics. () When FM/AM modes (MAIN-A UNIT) A portion of the microphone audio signals from the VA section (I; pins, ) are applied to the analog switch (I; pins, ). The selected audio signals are applied to I (pin ), and the output signals from pin are applied to the AF amplifier circuit (I, pin, ). () When SS/RTTY modes (DSP-A OARD) A portion of the transmit IF signal from the low-pass filter (Ic/d) is amplified at the IF (Ib) and buffer (Ia) amplifiers, and applied to the digital mixer circuit (I). The applied signal is mixed with a khz LO signal from the D/A converter (I) to demodulate into the AF signals. The demodulated signals are passed through the buffer amplifier (Ia), low-pass filter (Ib/ c) and AF amplifier (Id), and then applied to the MAIN-A unit via J (pin ) as the DMAF signal. The DMAF signal from the DSP-A board is amplified at the AL amplifier (MAIN-A unit; I, pins, ) and applied to the VA section of I (MAIN-A unit; pins, ). The volume controlled AF signals is applied to the AF amplifier circuit (MAIN-A unit; I, pins, ). - PLL IRUITS -- GNRAL The PLL unit generates a pair of st LO frequencies (.. MHz) for dualwatch and spectrum scope functions; a nd LO frequency ( MHz), rd LO frequency ( khz) and sweep LO frequency for the spectrum scope function. The st LO PLLs adopt a mixer-less dual loop PLL system and has VO circuits. The LOs, except the nd, use DDSs while the nd LO uses the fixed frequency of the crystal oscillator. -- TMPRATUR PROTTION IRUIT (PA UNIT) The cooling fan (HASSIS; MF) is activated while transmitting or when the temperature of the power amplifier exceeds the preset value. The temperature protection circuit consists of Q Q and R. While transmitting, Q and Q are turned ON, and provide a voltage to the cooling fan to rotate at medium speed. -- ST LO PLL IRUIT The st LO PLLs contain a main and reference loop as a dual loop system. oth PLLs have equivalent circuits this manual describes only the st LO PLL A circuit. The reference loop generates a. to. MHz frequency using a DDS circuit, and the main loop generates a. to. MHz frequency using the reference loop frequency. -

15 () RFR LOOP PLL The oscillated signal at the reference VO (Q, D) is amplified at the buffer amplifiers (Q, Q) and is then applied to the DDS I (I, pin ). The signal is then divided and detected on phase with the DDS generated frequency. The detected signal output from the DDS I (I, pin ) is converted into D voltage (lock voltage) at the loop filter (R R,, ) and then fed back to the reference VO circuit (Q, D). () MAIN LOOP PLL The oscillated signal at one of the main loop VOs (Q, D, D), (Q, D, D), (Q, D D) and (Q, D D) is amplified at the buffer amplifiers (Q, I) and is then applied to the PLL I (I, pin ) via the low-pass filter (L, ). The signal is then divided and detected on phase with the reference loop output frequency. The detected signal output from the PLL I (I; pin ) is converted into a D voltage (lock voltage) at the loop filter and then fed back to one of the VO circuits (Q, D, D), (Q, D, D), (Q, D D) and (Q, D D). The oscillated signal is amplified at the buffer amplifiers (Q, I) and then applied to the RF- unit as a st LO A signal after being passed through the low-pass filters (L, and L L, ) and highpass filter (L, ) and mute circuit (D). -- ND LO AND RFR OSILLATOR IRUITS The reference oscillator (X, Q) generates a. MHz frequency for the DDS circuits as a system clock and for the LO output. The oscillated signal is doubled at the doubler circuit (Q, Q) and the. MHz frequency is picked up at the double tuned filter (L, L). The. MHz signal is applied to the RF- unit as a nd LO signal. -- RD LO IRUIT The DDS I (I) generates a -bit digital signal using the MHz system clock. The digital signal is converted into an analog wave signal at the D/A converter (R R). The converted analog wave is passed through the bandpass filter (L, L, ) and then applied to the MAIN-A unit as the rd LO signal. -- MARKR IRUIT The divided signal at the DDS circuit (I) is used for the marker signals with the I-PROIII. The reference signal for the DDS circuit (. MHz) is divided to produce an acceptable frequency signal, MHz, with the programmable divider then divided again by to obtain khz cycle square-wave signals. The generated marker signals are output from pin of the DDS I (I), and are then applied to the RF- unit via the mute switch (I) and J as the MKR signal. PLL IRUIT ANT.. MHz st mixer A Q Q RF- unit FI. MHz rystal filter nd mixer D khz rd mixer I MAIN-A unit khz to DSP-A board LOA Q Q Q Q.. MHz /N divider st LO PLL A circuit Main loop PLL st mixer LO. MHz.. MHz PLL unit LO khz LO to scope circuit (RF- unit, I) SLO. MHz to scope circuit (RF- unit, D) SLO I Ref. loop PLL Q Phase detector.. MHz / bit D/A st LO PLL circuit PF X Q Q PF D/A LPF D/A LPF Loop filter Q. MHz I Phase detector DDS DDS I DDS I PLL I I Reference oscillator X:. MHz -

16 - ANTNNA TUNR IRUITS -- MATHING IRUIT (TUNR-A UNIT) The matching circuit is a T-network. Using tuning motors, the matching circuit obtains rapid overall tuning speed. Using relays (RL RL), the relay control signals from the antenna tuner PU (TRL-A unit; I) via the buffer amplifier (I, I) ground one of the taps of L L and add capacitors ( ). After selecting the coils and capacitors, motors (TRL-A unit; MF, MF) adjust and using the antenna tuner PU (TRL-A unit; I) and the motor controller (TRL-A unit; Q Q, D, D, D, D) to obtain a low SWR (Standing Wave Ratio). -- DTTOR IRUIT (TRL-A UNIT) () SWR detector Forward and reflected power are picked up by a current transformer (L), detected by D (FOR) and D (RF), and then amplified at Ia and Ib, respectively. The amplified voltages are applied to the antenna tuner PU (I, pins, ). The tuner PU detects the SWR. () Reactance components detector Reactance components are picked up by comparing the phases of the RF current and RF voltage. The RF current is detected by L and R and buffer-amplified at Ie and Ia and then applied to the phase comparator (Ia). RF voltages are detected by and then applied to the phase comparator (Ib) after being amplified at the buffer amplifiers (Ic, Ib). The output signal from the phase comparator (Ia, pin for RF current, Ib pin for RF voltage) is rectified at D and D for conversion into D voltage. The rectified voltage signals are combined, then amplified at the inverter amplifier (Ib), then applied to the antenna tuner PU (I, pin ). A -MOS I is used for the buffer amplifier (I) to improve functionable sensitivity; the inverter amplifier (I) is very responsive even with a low signal level input. Together, these ensure quick and stable signal detection even at low RF signal level input. () Resistance components detector Resistance components are picked up by L, and detected by D, D and Q. The detected resistance components are amplified at the inverter amplifier (Ia), and then applied to the antenna tuner PU (I, pin ). () Tuning motors (TRL-A and TUNR-A units) A motor controller (Q Q, D, D, D, D) rotates the tuning motors (TUNR-A unit; MF, MF) to obtain a low SWR. () Tuning relays (TUNR-A unit) According to the operating frequency band and antenna condition, tuning relays select the capacitors and coils. -- ANTNNA TUNR PU PORT ALLOATION (TRL-A unit; I) Pin Port Description number name AN Input port for the resistance components detection voltage. AN Input port for the refl ected RF power voltage. AN Input port for the forward RF power voltage. PRS Input port for the transceiver power OFF. IKY Outputs transmit control signal to the main PU (I ). ISTA Input port for the antenna tuner start signal. THRU Input port for the [TUNR] ON/OFF signal from main PU (I).. TR Input port for the TX/RX switching signal. VHF Output the coil select signals for the tuner unit. M, M, M, M, M, M O O, I I AZ, AY, AX, AW, PZ, PY, PX, PW M, M, M, M, M, M AN Output the coil select signals to the tuner unit. Output the capacitor select signal to the tuner unit. Output pulse-type control signals for the tuning motors. (MF, MF) Output the coil select signal to the tuner unit. Input port for the reactance components detection signal. -- MOTOR ONTROL IRUIT (TRL-A AND TUNR-A UNITS) The control circuit of the internal antenna tuner consists of the PU, PROM (lectronically-rasable Programmable Read Only Memory), tuning motors and tuning relays. () PU and PROM (TRL-A unit) The antenna tuner PU (I) controls the tuning motors via the motor controller (Q Q, D, D, D, D) and tuning relays, and memorizes the best preset position in khz steps. The memory contents are stored in the PROM (I) without a backup battery. -

17 - SOP IRUITS -- SOP RIVR IRUIT (RF- UNIT) A portion of the. MHz st IF signal from the st mixer circuit (Q Q: while receiving) or IF amplifier (Q: while transmitting) is passed through the PIN attenuator (Q) and amplified at the IF amplifiers (Q, Q), and then mixed with the. MHz scope nd LO (SLO) signal at the mixer circuit (D) to produce the. MHz IF signal. The mixed IF signal is passed through the ceramic bandpass filters (FI, FI) to suppress unwanted signals. The filtered IF signal is applied to the FM IF I (I, pin ). The applied. MHz IF signal is mixed with the sweep LO (SLO) signals from the PLL unit at the FM IF I (I). The mixed IF signals are filtered at the ceramic bandpass filter (FI) then applied to the limiter amplifier section in the FM IF I (I, pin ). The applied IF signals are converted into D voltages according to the applied IF signal strength at the RSSI section in the I. The converted voltages are output from pin (I) and amplified at I, then applied to the MAIN-A unit as the SPL signal. Some of the D voltages from the FM IF I (I) are amplified at I to produce AG voltages for the IF amplifiers (Q, Q), producing wider dynamic range. y sweeping LO signals (SLO) are applied to the mixer section in the FM IF I (I), the spectrum scope function is activated. -- SWP LO IRUIT (PLL UNIT) The sweep LO signals (SLO) are generated by the DDS I (I) using the MHz system clock. A -bit digital signal is converted into analog wave signals at the D/A converter (R R). The converted analog wave is passed through the bandpass filter (L, L, ) then applied to the RF- unit via (J) after being amplified at the buffer amplifier (Q). - POWR SUPPLY IRUITS -- PA UNIT LIN PHV HV V VA av V HV -- FRONT UNIT LIN VF V V V +V DSRIPTION The voltage from an external power supply via the common filter circuit (FILTR-A unit; L, L). The same voltage as the PHV line passed through a fuse (F). The same voltage as the HV line passed through the switching relay (RL). The same voltage as the V line is applied to the AF power amplifier (MAIN-A unit; I). ommon V converted from the V line and regulated by the + regulator circuit (I). ommon V converted from the V line and regulated by the + regulator circuit (I). ommon V converted from the HV line and regulated by the HV regulator circuit (I). DSRIPTION ommon V converted from the V line and regulated by the + regulator circuit (I). ommon V converted from the V line and converted by the D-D converter circuit (I, Q, D). The voltage is applied to the V, V regulator circuits and etc. ommon V converted from the V line and regulated by the regulator circuit (I). ommon V converted from the V line and regulated by the V regulator circuit (I). ommon V converted from the V line and converted by the V D-D converter circuit (I, Q, D). SOP IRUIT DIAGRAM st LO signal to nd mixer circuit SLO signal (.. MHz*) RF signals st mixer A Q Q Q IF amp. Q IF amp. SLO signal (. MHz) eramic PF eramic PF D FI FI Ib I Mixer Limiter amp. FI eramic PF AG RF- unit to the MAIN-A unit SPL signal amp. RSSI Ia *depending on sweeping passband width -

18 -- MAIN-A UNIT LIN RV TV -- TRL-A AND PLL UNITS LIN DSRIPTION V V - LOGI IRUITS DSRIPTION Receive V converted from the V line and regulated by the RV regulator circuit (Q, Q, D). Transmit V converted from the V line and regulated by the TV regulator circuit (Q, Q, D). ommon V for the antenna tuner PU (TRL-A unit; I), PROM (TRL-A unit; I) and etc. converted from the V line and regulated by the + regulator circuit (TRL-A unit; I). ommon V for each PLL-A and PLL- circuits regulated from the V line and regulated by the + regulator circuit (PLL unit; I: PLL-A, I: PLL-). -- AND SLTION DATA (RF-, TRL-A, PLL UNITS) Frequency [MHz] I I (RF- ) I (TRL-A).... LS.... LS W.. LS.. W.. LS.. W.... LS.. W.. W.. LS.... W.. LS.. W.. LS.... W I (PLL) VAS VAS VAS VAS I (PLL) VS VS VS VS -- SU-PU PORT ALLOATIONS (DISPLAY OARD; I) Pin number,,,,,, Port name OS, OS DRS MS, MSA DOTK, DSHK MDM MDM TNRD, MOND ND, NRD LOD, TXD RXD, PTD NOTD P, PA MTV RSA, RS PA, P LMFD LFMD ALL NRL MIGL PWRL MPL KYSL DLL NOTL PITL Description Input and output ports for the system clock oscillator (X;. MHz). Input port for the reset signal. Input port for the [DIAL]; pulse-type signals are applied. Input ports for the [L-KY] jack. Output ports for the S/RF meter backlight and function switch activation indicator brightness control signal. Port MDM MDM MDM acklight level High Low High Low High Low High Low High High Low Low High High Low Low Low High High High High ontrol signal output ports for the activation indicator of function switches. High : When the function is activated. Input port for the [TWIN PT (inner)] control (PT board, S/inner). Outputs the S/RF meter (M) drive signal. Input ports for the [RIT/ TX] control; pulse-type signals are applied. Input port for the [TWIN PT(outer)] control (PT board, S/outer). Input port for data signal from the main-pu (MAIN-A unit; I). Outputs data signal for the main-pu (MAIN-A unit; I). A/D input port for the [AL] control (R/ inner). A/D input port for the [NR] control (R/ outer). A/D input port for the [MI GAIN] control (R). Input port for the [RF POWR] control (R). Input port for the [OMP] control (R). Input port for the [KY SPD] control (R). Input port for the [K-IN DLAY] control (R). Input port for the [NOTH] control (PT board, R/inner). Input port for the [W PITH] control (PT board, R/outer). -

19 -- MAIN-PU PORT ALLOATIONS (MAIN-A UNIT; I) Pin number,, Port name A A, A A, A A SKYS RTKI Description Address signal output ports for the LD controller (I). Input port for the [KY] jack. Low : During key down Input port for the RTTY keying. Pin number, Port name ON (PDAT) ON (PK) XTAL, XTAL Description Outputs data signal for the DDS circuits (PLL unit; I, I). Outputs clock signal for the DDS circuits (PLL unit, I, I). Input ports for the PU system clock oscillator (X;. MHz).,, DPGI DSDR PWRK DSKY D D, D D, D D TXD RXD MK MDAT TRVI IKY RXS TXS ISTA DRS UNL PST Power supply detection input port for the DSP-A board. Input port for data signal from DSP-A board. Input port for the [POWR] switch. Low : When the [POWR] is pushed. Outputs W/RTTY keying. Data bus lines for the LD controller (I) and I/O expander (I I). Outputs the I-V signal. Input port for the I-V signal. Outputs clock signal. Outputs data signal. Input port for the [XVRT] detection signal. Input port for transmit control signal from the antenna tuner PU (TRL-A board; I). Outputs RV regulator (Q, Q, D) control signal. Low : While receiving Outputs TV regulator (Q, Q, D) control signal. Low : While transmitting Outputs antenna tuner start signal. Outputs reset/inhibit signal to the sub- PU (DISPLAY board; I), DDS Is (PLL unit; I, I), antenna tuner PU (TRL-A board; I), and etc. Input port for unlock signal from the PLL unit. Outputs strobe signals for the I/O expander I (PLL unit; I). LRS LTXD LRXD TMD SPL VOXL AVXL ASO ASO ASO STON P SNI Outputs reset/inhibit signal for the LD controller (I), I/O expander (I I), and etc. Outputs data signal for the sub-pu (DISPLAY board; I). Input port for data signal from the sub-pu (DISPLAY board; I). Outputs [TIMR] indicator control signal. High : When the timer function is ON Input port for the scope signal. A/D input port for the VOX gain. A/D input port for the anti-vox level. A/D input port via the analog switch (I) for the SML signal from the S-meter amplifier circuit (Ia), and ALL signal from the AL meter amplifier circuit (Ia). A/D input port via the analog switch (I) for the NSQO signal from the level conveter (DSP-A board; I), for noise squelch operation, and FORL signal from the power meter amplifier circuit (Ia). A/D input port from the analog switch (I) for the FNTL signal from the low-pass filter (DSP-A board; Ia), for tone squelch operation, and RFL signal from the SWR meter amplifier circuit (Ib). Outputs W side-tone signals. Outputs beep audio signals. Input port for connected microphone s PTT switch and SND signal from the A jacks. High : While PTT switch is pushed or activated from an external unit. PSL ON Outputs strobe selection signals for the I/O expander (PLL unit; I). Outputs control signal for the DDS circuits (PLL unit; I, I). PWRS Outputs control signal for the power switching relay (PA unit; RL). High : During power ON -

20 -- INPUT XPANDR ALLOATIONS () DISPLAY board; I Pin number, Port name KI MUDK KI KI KI, KI Description Input port for the [RIT], [ TX] and [LAR] switches. Input port for [UP] and [DN] switches of the connected microphone. Input port for the [DUALWATH], [HANG], [V/M] and [M/S] switches. Input port for the [TUNR], [MONITOR], [N] and [NR] switches. Input ports for the multi-function switches. () MAIN-A unit; I Pin Port number name Description TFL Input port transmission status for W RTDT Input port for RTTY decode data. Input port for the KY signal from the KY connected AH-. Low : While tuning or tune NG Input port for AH- connection detection. TON High : When AH- is connected. VINT Input port for interrupting signal from audio recoder. VRA Input port for address clock signal from audio recoder. Input port for busy signal from SSY the installed UT- SPH SYNTHSIZR. -- OUTPUT XPANDR ALLOATIONS () PLL unit; I Pin number Port name PST PST PST PST PST PST PST Description Outputs strobe signals to DDS I (I) for the st LO PLL A circuit. Outputs strobe signals to PLL I (I) for the st LO PLL A circuit. Outputs strobe signals to DDS I (I) for the st LO PLL circuit. Outputs strobe signals to PLL I (I) for the st LO PLL circuit. Outputs strobe signals to DDS I (I) for the rd LO PLL circuit. Outputs strobe signals to PLL I (I) for the S LO PLL circuit. Outputs strobe signals to DDS I (I) for the S LO PLL circuit. () PLL unit; I Pin number Port name MAKS PAMT PAFS VAS VAS VAS VAS () PLL unit; I Pin number Port name PMT PFS VS VS VS VS Description Outputs the marker mute switch (I) control signal. High : When the marker ON is selected. Outputs LO mute switch (Q) control signal. Low : Muted Outputs bandpass filter select switch (Q) control signal. High : When less than MHz is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Description Outputs LO mute switch (Q) control signal. Low : Muted Outputs bandpass filter select switch (Q) control signal. High : When less than MHz is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. Outputs the LO switch (Q) control signal. High : While.. MHz band is displayed on the main band. -