HF/VHF ALL MODE TRANSCEIVER

Transcript

1 HF/HF ALL MO TRANIR -0XZ- Jul. 00

2 INTROUTION This service manual describes the latest technical information for the I-00 HF/HF ALL MO TRANIR at the time of publication. AUTION NR connect the transceiver to an A outlet or to a power supply that uses more than specified. This will ruin the transceiver. MOL I-00 RION UR FRA N ITR P KOR ARRIR POWR 00W O NOT expose the transceiver to rain, snow or any liquids. O NOT reverse the polarities of the power supply when connecting the transceiver. O NOT apply an RF signal of more than 0 dm (00 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. e sure to include the following four points when ordering replacement parts:. 0-digit Icom parts numbers. omponent name. quipment model name and unit name. Quantity required <ORR XL> ORRING PART 000.I TAFNG I-00 MAIN UNIT pieces 0000 crew screw I-00 Top cover 0 pieces Addresses are provided on the inside back cover for your convenience. RPAIR NOT. Make sure that the problem is internal before disassembling the transceiver.. O NOT open the transceiver until the transceiver is disconnected from its power source.. O NOT force any of the variable components. Turn them slowly and smoothly.. O NOT short any circuits or electronic parts. An insulated tuning tool MUT be used for all adjustments.. O NOT keep power ON for a long time when the transceiver is defective.. O NOT transmit power into a tandard ignal Generator or a weep Generator.. ALWAY connect a 0 d to 0 d attenuator between the transceiver and a eviation Meter or pectrum Analyzer when using such test equipment.. RA the instructions of test equipment throughly before connecting a test equipment to the transceiver. Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United tates, the United Kingdom, Germany, France, pain, Russia and/or other countries.

3 TAL OF ONTNT TION PIFIATION TION INI IW TION IAMLY INTRUTION TION IRUIT RIPITON - RIR IRUIT TRANMITTR IRUIT PLL IRUIT ANTNNATUNR IRUIT POWR UPPLYIRUIT TION AJUTMNT PROUR - PRPARATION FOR RIING PLL AJUTMNT TRANMIT AJUTMNT RI AJUTMNT AJUTMNTMO TION PART LIT TION MHANIAL PART TION MI-ONUTOR INFORMATION TION OAR LAYOUT TION TION TION 0 LOK IAGRAM WIRING IAGRAM OLTAG IAGRAM FRONT UNIT LOGI UNIT MAIN UNIT RF UNIT TRL UNIT TUNR UNIT PA UNIT P UNIT

4 TION. PIFIATION General Frequency coverage : (Unit: MHz) Receive * * Transmit.00.*.00.* * * *.0.000* * * * * * ome frequency ranges are not guaranteed. * epending on version. Mode : U, L, W, RTTY, AM, FM No. of memory ch. : 0 ( regular, scan edges and call) Antenna connector : O- ( for HF/0 MHz and for MHz; 0 Ω) Operating temp. range : 0 to +0 ; + F to +0 F Frequency stability : Less than ± ppm from min. to 0 min. after power ON. After that, rate of stability is less than ± ppm/hr. at (+ F). Temperature fluctuations 0 to +0 (+0 F to + F) less than ± ppm. Frequency resolution : Hz Power supply :. ±% (negative ground) Power consumption : Transmit Max. power.0 A Receive tandby. A Max. audio.0 A imensions : (W) 0(H).() mm (projections not incl.) (W) (H) () in Weight (approx.) :.0 kg; lb oz A connector : -pin IN connector A connector : -pin IN connector ATA connector : Mini IN -pin I- connector : -conductor. (d) mm ( ) Transmitter Output power (continuously adjustable): /W/RTTY/FM Less than to 00 W AM Less than to 0 W Modulation system : PN modulation AM Low power modulation FM Phase modulation purious emission : 0 d (HF bands) 0 d (0/ MHz) arrier suppression : 0 d Unwanted sideband : d suppression TX variable range : ±. khz Mic. connector : -pin connector (00 Ω) L-KY connector : -conductor.(d) mm ( ) KY connector : -conductor.(d) mm ( ) N connector : Phono (RA) AL connector : Phono (RA) Receiver Receive system : Triple conversion superheterodyne system Intermediate frequencies: st. MHz nd khz rd khz ensitivity (typical) :, W, RTTY 0. μ* (.0. MHz) (0 d /N) 0. μ* (0 MHz) 0. μ* ( MHz) AM (0 d /N) μ (0.. MHz) μ* (.0. MHz) μ (0* /* MHz) FM ( d INA) 0. μ* (.0. MHz) 0. μ* (0 MHz) 0. μ* ( MHz) * Pre-amp is ON, * Pre-amp is ON, * Pre-amp is ON quelch sensitivity (Pre-amp: OFF):, W, RTTY Less than. μ FM Less than.0 μ electivity : (W:. khz) More than. khz/ d Less than. khz/ 0 d W (W: 00 Hz) More than 00 Hz/ d Less than 00 Hz/ 0 d RTTY (W: 0 Hz) More than 0 Hz/ d Less than 0 Hz/ 0 d AM (W: khz) More than.0 khz/ d Less than.0 khz/ 0 d FM (W: khz) More than.0 khz/ d Less than 0.0 khz/ 0 d purious and image rejection ratio: HF/0 MHz More than 0 d (except IF through on 0 MHz band) MHz More than 0 d AF output power : More than.0 W at 0% distortion (at. ) with an Ω load RIT variable range : ±. khz PHON connector : -conductor. (d) mm ( ) xt. P connector : -conductor. (d) mm ( )/ Ω Antenna tuner Matching impedance range: HF bands. to 0 Ω unbalanced (Less than WR :) 0 MHz band 0 to Ω unbalanced (Less than WR.:) Minimum operating input power : W (HF bands) W (0 MHz band) Tuning accuracy : WR.: or less Insertion loss : Less than.0 d (after tuning) All stated specifications are typical and subject to change without notice or obligation. -

5 TION. INI IW MAIN AN RF UNIT st LO PLL circuit PLL I (I0: M0) nd LO and reference oscillator circuit st mixer circuit (Q, Q: K0) rd LO PLL circuit nd mixer (: HW) RF unit * Located under side of the point TX rd mixer (I00: M) P unit RX rd mixer * (I0: TWF) MAIN unit -

6 ( PA AN TRL UNIT TRL unit WR detector bit PU (I: M0M) FILTR unit PA unit HF/0 MHz power amplifiers (Q, Q: ) ( MHz power amplifiers Q0, Q0: -

7 TION IAMLY AN OPTION INTALLATION Opening the transceiver s case Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units, etc. AUTION: IONNT the power cable from the transceiver before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equipment damage. q Remove the screws from the left side of the transceiver to remove the carrying handle as shown at right. w Remove the screws from the top of the transceiver and the screws from the sides, then lift up the top cover. e Turn the transceiver upside down. r Remove screws from the bottom of the transceiver, then lift up the bottom cover. UT-0 OI YNTHIZR UNIT The UT-0 announces the accessed readout s frequency, mode, etc. (-meter level can also be announced) in a clear, electronically-generated voice, in nglish (or Japanese). Push [LOK/PH] for sec. to announce the frequency, etc. q Remove the top and bottom covers as shown above. w Remove the protective paper attached to the bottom of the UT-0 to expose the adhesive strip. e Plug UT-0 into J0 on the MAIN unit as shown in the diagram at right. r Adjust the trimmer, PH LL: R on the MAIN unit, to set the speech level if desired. Refer to the illustration at right. t Return the top and bottom covers to their original positions. R J0 MAIN unit UT-0 -

8 R- HIGH TAILITY RYTAL UNIT y installing the R-, the total frequency stability of the transceiver will be improved. q Remove the bottom cover as shown on the previous page. w Remove the screws from the shield cover of the RF unit, and disconnect P (HAI) from J (MAIN unit), then lift up the shield cover. There is an earth spring on the shield cover, so be careful not to lose it when removing the cover. TUNR (antenna tuner) connector arth spring hield cover P (HAI) RF unit J (MAIN unit) e Remove the screws from the RF unit, disconnect J, J and J, then remove the RF unit. r Remove the supplied internal crystal and replace with the R-. t Return the RF unit, J, J and J to their original positions. lue belt J lue lack belt J lack J Red R- upplied crystal Red belt oldering points RF unit y onnect a frequency counter to the J, LO IN, then adjust the reference frequency to be MHz with the L0 on the RF unit. u Return the J, shield cover, earth spring and bottom covers to their original positions. onnect a frequency counter, then adjust the frequency to be MHz. RF unit J LO IN L0 -

9 TION. IRUIT RIPTION - RIR IRUIT -- RF WITHING IRUIT (TRL, RF AN PA UNIT) The RF switching circuit leads receive signals to bandpass filters 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 (on HF/ m bands) from [ANT ] or [ANT ] pass through the antenna selector (TRL unit; RL), tuner switching relays (TRL unit; RL, RL), transmit/receive switching relay (TRL unit; RL), and low-pass filter (TRL unit; L, L, L,, 0, ), and are then applied to the RF unit via J (P). The signals from the TRL unit bypass or pass through the 0 d attenuator (RF unit; RL, R, R). y selecting the attenuator, 0 (bypass) and 0 d attenuations are obtained. The signals are then applied to the RF filters. While operating on the MHz band, the RF signals from the [ MHz ANT] are passed through the low-pass filter (PA unit; L0 L0, 0, 0 0) and transmit/receive switching relay (PA unit; RL0), then applied to the RF unit via J0 (P0). -- RF FILTR IRUIT (RF UNIT) The RF filter circuit contains bandpass and low-pass filters. andpass filters pass only the desired band signals and suppress any undesired band signals. () 0.0. MHz The signals are applied to the attenuator and low-pass filter directly (see above at right). (). 0 MHz The signals pass through the high-pass filter (L L, ) to suppress excessively strong signals below. MHz. The filtered signals are applied to a low-pass or one of bandpass filters (see above at right). RF y 0.0. MHz 0 L, L, R R,,. MHz L L, MHz L L, MHz L L, MHz L L, MHz L L, MHz L L, 0 MHz L L, 0 0 MHz W 0 L0 L0, MHz L L, MHz W 0 L0 L0, MHz R None (via 00) 0, L0, L0 -- PR-LIFIR IRUIT (RF UNIT) Atotal of pre-amplifier circuits are employed in this transceiver. for HF/ m bands and for MHz band operation. When the pre-amplifier operation is turned OFF, the RF signals bypass this circuit. When [P.] is selected, the filtered signals are applied to the pre-amplifier circuit (Q, Q), which has 0 d gain for the. MHz range, and when [P.] is selected, the signals are applied to the pre-amplifier circuit (I), which has d gain for the 0 MHz range. The pre-amplified signals are applied to the 0 MHz cut-out lowpass filter (L0 L,, ). uring MHz band operation, the filtered signals are preamplified at the HF pre-amplifier (Q0) when the [P.] is turned ON, and passed through the tunable bandpass filter (0 0, L0 L0). The filtered signals are applied to the st mixer circuit. () 0 MHz The MHz band signals are bypassed or passed through the attenuator (R), then applied to the tunable bandpass filter (see above at right). The filtered signals are applied to the pre-amplifier circuit. ANT or ANT MHz ANT MHz 0 MHz st mixer Q, Q st LO FIa/b rystal filter. MHz nd mixer nd LO.0 MHz FI rystal filter khz rd mixer I0 khz P rd LO khz to squelch gate (I0) -

10 -- T MIXR AN T IF IRUIT (RF UNIT) The st mixer circuit mixes the received signals with the st LO signal to convert the received signals into a fixed. MHz st IF signal. The signals from the pre-amplifier circuit, or signals which bypass the pre-amplifier circuit, are applied to the st mixer (Q, Q) and mixed with the st LO signal (.. MHz) coming from the st LO PLL circuit via the LO amplifier (Q0) and low-pass filter. The mixed st IF signal is passed through the MFs (Monolithic rystal Filter: FIa/b) to suppress out-of-band signals. The filtered signal is amplified at the IF amplifier (Q), and then applied to the nd mixer circuit. When the bandscope function is activated, the st LO sweeping signal is supplied to the st mixer circuit. -- N MIXR IRUIT (RF UNIT) The nd mixer circuit converts the st IF signal into the nd IF frequency by mixing with the nd LO signal (.00 MHz). The st IF signal from the IF amplifier (Q) is applied and converted into a khz nd IF signal at the nd mixer circuit () by mixing with a fixed MHz nd LO signal. The nd IF signal is passed through the low-pass filter (L, ) to suppress undesired signals such as the nd LO signal, and the applied to the MAIN unit via J. The nd LO signal is a doubled reference frequency, generated at the reference oscillator (X0:.0 MHz) and doubled at Q0 and Q0. -- NOI LANKR IRUIT (MAIN 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 (, ). A portion of the nd IF signal from RF unit is amplified at the noise amplifiers (Q00 Q0), and is then detected at the noise detector (00) to convert the noise components to voltages. The signal is then applied to the noise blanker switch (Q0, Q0). At the moment detected voltage exceeds Q0 s threshold level, Q0 outputs a blanking signal to close the noise blanker gate (, ). The PLL unlock signal are also applied to Q0 to control the noise blanker gate. ome voltage from the noise detector circuit is fed back to the noise amplifiers (Q00, Q0) via the amplifiers (Q0, Q0). The amplifiers function as an AG circuit to reduce average noise. Therefore, the noise blanker function shuts off pulse-type noise only. -- N IF IRUIT (MAIN 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 (, ) is amplified at the nd IF amplifier (Q0) and passed through the ceramic filters (FI, FI). The filtered signal is applied to the rd mixer circuit. -- R MIXR AN R IF IRUIT (MAIN UNIT) The rd mixer circuit mixes the nd IF signal with the rd LO signal to obtain the rd IF ( khz) signal. The nd IF signal from the ceramic filters (FI, FI) is applied to the rd mixer circuit (I0, pin ). The rd LO signal from the rd LO PLL circuit is also applied to the rd mixer (I0, pin ). The mixed signal is output from pin. The rd IF signal is passed through the low-pass filter (I0a) and amplified at the rd IF amplifier (I0b). The filtered and amplified signal is then applied to the P unit via RIF line. -- P RIR IRUIT The P (igital ignal Processor) circuit enables digital IF filter, digital noise reduction, PN (Phase hift Network)/ Low Power/Phase demodulation, digital automatic notch, and etc. The khz rd IF signal from the rd IF amplifier (MAIN unit; I0b) is amplified at the differential amplifiers (Ia/b), and is then applied to the A/ converter section in the O I (I0). At the same time, the converted signal is level-shifted to. in the I (I0). The level-shifted signal is applied to the P I (I0) for the digital IF filter, demodulator, automatic notch and noise reduction, etc. The output signal from the P I is applied to the /A converter section in the O I (I0) to convert into the analog audio signals. Also the signals are level-shifted. to at the level converter section in the I (I0). The level-shifted audio signals are passed through the active filter (I0a), and then applied to the MAIN unit via J0 (pin ) as the RAF signal. P receiver circuit rd IF signal RIF khz Ib/a ifferential converter I0 O I A/ converter Level converter I0 P I /A converter Level converter I0a Aactive filter RAF AF signals MAIN unit -

11 --0 TWIN PT IRUIT General PT (Passband Tuning) circuit shifts the center frequency of IF signal to electronically narrow the passband width. This transceiver uses the Pcircuit 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 P I (I0) controlled by the [TWIN PT] controller adjusts the rd IF passband width and rejects interference. -- AG IRUIT 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 (MAIN unit; I0, pin ). The /A converter for AG (I0) supplies control voltage to the AG line and sets the receiver gain with the [RF/QL] control. The rd IF signal from the O I (I0) is detected at the AG detector section in the P I (I0). The output signal from the P I (I0) is level-shifted at the level converter (I0) and applied to the /A converter (I0). The AG voltage is amplified at the buffer amplifier section in I0 and is applied to the MAIN unit to control the AG line. When receiving strong signals, the detected voltage increases and the AG voltage decreases via the buffer amplifier (I0). As the AG voltage is used for the bias voltage of the IF amplifiers (RF unit; Q, MAIN unit; Q0), IF amplifier gain is decreased. -- AF LIFIR IRUIT (MAIN UNIT) The AF amplifier amplifies the audio signals to a suitable driving level for the speaker. The AF signals (RAF) from the P unit are passed through the squelch gate (I0) and amplified at the AF amplifier section of I0 (pins, ), and volume is controlled by the AFG signal at the A section (pins ). The volume controlled AF signals are passed through the AF mute gate (I0, pins, ), then applied to the AF power amplifier (I0, pin ) via the ripple filter (Q0). The amplified audio signals are passed through the [PHON] and [XT P] jacks then applied to the internal speaker when no plug is connected to the jacks. The AF mute gate is controlled by the [AF] control via the sub and main PUs. -- TON QULH IRUIT (MAIN UNIT) A portion of the detected FM audio signals from the P unit via the MONI line are amplified at the AF amplifier (I00). The amplified signals are applied to the low-pass filter (I00) to cut-out the 00 Hz or higher audio components, and subaudible tone signals only pass through. The filtered signal (subaudible tone) is then applied to the main PU (I00, pin 0). The main PU detects the frequency of the applied subaudible tone signal and releases the audio mute when a matched tone frequency signal is detected. -- QULH IRUIT (MAIN UNIT) The squelch circuit mutes audio output when the -meter signal is lower than the [RF/QL] setting level. The NQL or QL signal from the P unit is applied to the main PU (I00) and is compared with the threshold level set by the [RF/QL] control. The [RF/QL] setting signal is passed through the sub PU (IPLAY board; I00, pin ), and then applied to the main PU. The main PU analyzes the compared signal and outputs control signal to the squelch gate (I0, pin ) to open or close the squelch as the QL signal. AF amplifier circuit RAF P unit QL signal I0 I0 A quelch gate AFG signal MAIN unit AFM signal I0 Q0 Ripple filter Mute switch AF power amp. I0 [PHON] [XT P] Int. speaker - -

12 - TRANMITTR IRUIT -- MIROPHON LIFIR IRUIT (MAIN UNIT) The microphone amplifier circuit amplifies microphone audio signals to a level needed for the P circuit. Audio signals from the [MI] connector (MI board; J, pin ) are amplified at the audio amplifier section in I00 (pins, ), and then applied to the A section (I00, pin ). The gain controlled signals are output from (I00, pin ) and amplified at the AF amplifier (I0, pins ) and passed through the low-pass filters (I0, pins ) and analog switch (I0, pins, ). The signals are then applied to the P circuit as the TAF signal. The A section in I00 (pins ) controls microphone input gain according to the [MI GAIN] control level using the MIG signal coming from the main PU via the I/O expander (I0, pin ). -- OX IRUIT (MAIN UNIT) The OX (oice-operated-transmission) circuit sets transmitting conditions according to voice input. When the OX function is activated, a portion of the microphone signals are amplified at the OX amplifier (I0 pins, ) and applied to main PU (I00, pin 0) via the OXL line. A portion of the power amplified AF signals from the AF power amplifier (I0) are amplified at the anti- OX amplifier (I, pins, ) and applied to the main PU (I00, pin 0) via the AXL line. Then the main PU compares these and controls the transmitter circuit. -- P TRANMITTR IRUIT (P UNIT) The P (igital ignal Processor) circuit enables PN (Phase hift Network)/Low Power/Phase modulation, transmitter monitor, side tone, and etc. The microphone audio signals from the MAIN unit via the TAF line are amplified at the differential amplifiers (I0a/b), and are then applied to the A/ converter section in the O I (I0). At the same time, the converted signals are level-shifted to. in the I (I0). The level-shifted signal are applied to the P I (I0) and modulated at the P I to produce the khz transmitter IF signal. The modulated IF signal from the P I is applied to the /A converter section in the O I (I0) to convert into the analog IF signal. Also the signal is level-shifted. to at the level converter section in the I (I0). The level-shifted IF signal is passed through the active filter (I0b), and then applied to the MAIN unit via J0 (pin ) as the TIF signal. -- PH OMPROR IRUIT (P UNIT) 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 O I (I0) is applied to the P I (I0) and compressed at the P I to obtain an average audio level. At the same time, the compressed signals are modulated at the P I and applied to the /A converter section in the O I (I0). -- IF LIFIR AN MIXR IRUIT (MAIN AN RF UNIT) The modulated rd IF signal from the P unit (TIF: khz) is amplified at the rd IF amplifier (MAIN unit; I0a) and passed through the low-pass filters (MAIN unit; I0b/c). The filtered signal is applied to the rd mixer circuit (MAIN unit; I00, pin ). The applied rd IF signal is mixed with the rd LO signal from the circuit (RF unit; I0) to produce a khz nd IF signal. The nd IF signal is output from pin and passed through the ceramic bandpass filter (MAIN unit; FI) for unwanted signals are suppressed. The filtered nd IF signal is amplified at the nd IF amplifier (MAIN unit; Q0). The amplified signal is applied to the nd mixer circuit on the RF unit via J0. The nd IF signal is mixed with the MHz nd LO signal, coming from the PLL circuit, at the nd mixer circuit (RF unit; ) to obtain a. MHz st IF signal. The st IF signal is passed through the MFs (RF unit; FIb/a) to cutoff the undesired signals, and is then amplified at the st IF amplifier (RF unit; Q) via the T/R switch (RF unit; ). The amplified st IF signal is applied to the st IF mixer circuit (RF unit; ) via the attenuator (RF unit; ) and low-pass filter circuit. Transmitter construction I00 MI A I0 TAF MO signal P unit khz IF I00 TIF khz rd LO ( khz) FI eramic filter MAIN UNIT. khz nd LO (.00 MHz) FIb/a rystal filter andwidth khz st LO LPF RF UNIT PFs - -

13 The operating (transmitting) frequency is produced at the st IF mixer circuit (RF unit; ) by mixing the st IF and st LO signals. The mixed signal is then applied to the RF circuit. -- RF IRUIT (RF AN PA UNIT) The RF circuit amplifies operating (transmitting) frequency to obtain 00 W of RF output. The signal from the st IF mixer is passed through one of the low-pass or bndpass filters (Refer to page - for bandpass filters used) and high-pass filters after passing through the low-pass filter (RF unit; L, L,, ). The filtered RF signal is amplified at the wide-band YGR amplifier (RF unit; I), and is then applied to the PA unit via J. The signal applied from the RF unit is amplified at the predrive (PA unit; Q, Q) and drive (R board; Q, Q) amplifiers. These amplifiers cover all HF, 0 MHz and MHz band amplifying operation. When operating on the HF or 0 MHz band, the signal from the drive amplifier is power amplified at the HF/0 MHz power amplifier (PA unit; Q, Q) via the band switching relay (PA unit; RL). However, the MHz signal is power amplified at the MHz power amplifier (PA unit; Q0, Q0) to obtain a stable 00 W of RF output power. The amplified signal is applied to the desired antenna connector via one of low-pass filters. -- AL IRUIT (MAIN 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 PWR] control even when the supplied voltage shifts, etc. The RF power level is detected at the WR detector circuit (HF/0 MHz bands: TRL unit;, MHz band: PA unit; 0) to be converted into voltage and applied to the MAIN unit as the FOR (HF/0 MHz) or FOR ( MHz) signal. The FOR or FOR signal is applied to the comparator (I00, pin ). The PO signal, controlled by the [RF PWR] control via the I/O expander (I0, pin ), is also applied to the other input (pin ) for reference. The compared signal is output from pin and applied to the IF amplifiers in the MAIN (Q0) and RF (Q) units to control amplifying gain. When the FOR or FOR signal exceeds the PO voltage, AL bias voltage from the comparator controls the IF amplifiers. This adjusts the output power to a specified level from the [RF PWR] control until the FOR (FOR) and PO voltages are equalized. In AM mode, the comparator operates as an averaging AL amplifier. Q0 turns ON and the PO voltage is shifted for 0 W AM output power (maximum) through R0. The AL bias voltage is also applied to the AL meter amplifier (I00, pin ) to obtain an AL meter signal (ALL). The amplified signal is passed through the analog switch (I 00, pins, ) and applied to the main PU (I00, pin 0) to drive the /RF meter via the sub PU (I00) on the IPLAY board. An external AL input from the [AL] jack or [A] sockets is applied to the buffer amplifier (Q0). xternal AL operation is identical to that of the internal AL. The FOR or FOR signal is also applied to the power meter amplifier (I0, pin ). The amplified signal is applied to the main PU (I00) after being switched by the analog switch (I00, pins, ) as an FORL signal to drive the /RF meter via the sub PU (IPALY board; I00). -- AP IRUIT (MAIN UNIT) The AP (Automatic Power ontrol) circuit protects the power amplifiers on the PA unit from high WR and excessive current. The reflected wave signal appears and increases when the connected antenna is mismatched to 0 Ω. The WR detector circuit (HF/0 MHz bands; TRL unit;, MHz band; PA unit; 0) detects the reflected signal, and applies it to the AP circuit (I00, pin ) as a (HF/0 MHz) or ( MHz) signal. When the or 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 (I00, pins, ). When the current of transistors is increased, the amplifier controls the AL line to prevent excessive current flow. A portion of the or signal is applied to the WR meter amplifier (I0, pin ). The amplified signal is applied to the main PU (I00) after being switched by the analog switch (I00, pins, ) as an L signal to drive the WR meter. P receiver circuit AF signal TAF I0b/a ifferential converter I0 O I I0 P I I0b Aactive filter TIF khz IF signal A/ converter Level converter /A converter Level converter MAIN unit P unit MAIN unit -

14 -- TMPRATUR PROTTION IRUIT (MAIN AN RF UNIT) The cooling fan (HAI; MF) is activated while transmitting or when the temperature of the power amplifier exceeds the preset value. The temperature protection circuit consists of Q0, Q0 and 0 (MAIN unit), I0 and Q00 Q00 (RF unit), and ARITOR-A/// boards. While transmitting, I0 (RF unit) outputs FANL signal to Q00 (RF unit). Then Q00 (RF unit) is turned ON, Q0, Q0 (MAIN unit) provide a voltage to the cooling fan to rotate at low speed. The ARITOR- board, detects the temperature of Q; PA unit (ARITOR- board for Q0; PA unit), and I0 (RF unit) outputs FANM signal and activates Q00 (RF unit) to accelerate the cooling fan at medium speed when the detected temperature exceeds 0 ( F). When the detected temperature is at 0 ( F) or more, I0 (RF unit) outputs FANH signal and activates Q00 (RF unit), the cooling fan rotates at high speed. The temperature protection circuit keeps the cooling fan rotating even while receiving until the Q (PA unit) or Q0 s (PA unit) temperature drops to 0 (0 F) or below. --0 MONITOR IRUIT (P UNIT AN MAIN UNIT) The microphone audio signals can be monitored to check voice characteristics. () When FM/AM modes (MAIN UNIT) A portion of the microphone audio signals are passed through the P unit, and then applied to the AF amplifier circuit as the MONI signal. () When /RTTY modes (P UNIT) A portion of the transmit IF signal from the P I (I0) is mixed with a khz LO signal to demodulate into the AF signals. The demodulated signals are level-shifted. to at the level converter (I0) and then applied to the /A converter (I0) to convert into the analog AF signal. The AF signals are then applied to the MAIN unit as the MONI signal. The MONI signal from the P unit is amplified at the AF amplifier (MAIN unit; I00, pins, ) and passed through the analog switch (MAIN unit; I00) and then applied to I0 (MAIN unit). The applied signal is amplified at the AF amplifier section (pins, ) and volume controlled at the A section (pins, ). The volume controlled AF signals is applied to the AF amplifier circuit (MAIN unit; I0). -- T LO PLL IRUIT (RF UNIT) The st LO PLL contains a main and reference loop as a dual loop system. The reference loop generates an approximate 0. MHz frequency using a circuit, and the main loop generates a. to. MHz frequency using the reference loop frequency. () RN LOOP PLL The oscillated signal at the reference O (Q0, 0) is amplified at the amplifiers (Q0, Q0) and is then applied to the I (I0, pin ). The signal is then divided and detected on phase with the generated frequency. The detected signal output from the I (pin ) is converted into voltage (lock voltage) at the loop filter (R, R, ) and then fed back to the reference O circuit (Q0, 0). () MAIN LOOP PLL The oscillated signal at one of the main loop Os (O board, Q0, 0, Q,, Q,, Q, ) is amplified at the buffer amplifiers (PLL board, I0, Q) and is then applied to the PLL I (I0, pin ). The signal is then divided and detected on phase with the reference loop output frequency. The detected signal output from the PLL I (pin ) is converted into a voltage (lock voltage) at the loop filter and then fed back to one of the O circuits (O board, Q0, 0, Q,, Q,, Q, ). The oscillated signal from the buffer amplifier (I0) is also applied to the MAIN unit as a st LO signal after being doubled or passed through the low-pass filter. Using O and st LO frequencies Operating frequency Using O st LO frequency 0.0. MHz Q0, 0.0. MHz.0. MHz Q,.0. MHz.0. MHz Q,.0 0. MHz MHz Q, MHz MHz Q,. MHz (with doubler) MHz Q, MHz (with doubler) - PLL IRUIT -- GNRAL The PLL circuits generate a reference frequency (.000 MHz); st LO frequencies (.. MHz); nd LO frequency ( MHz), rd LO frequency (.000 khz). The st LO PLL adopts a mixer-less dual loop PLL system and has O circuits which cover from 0 khz to MHz. The st LO and rd LO use s, while the nd LO uses the fixed frequency of the crystal oscillator. -- N LO AN RN OILLATOR IRUIT (RF UNIT) The reference oscillator (X0, Q0) generates a.0 MHz frequency for the circuits as a system clock and for the LO output. The oscillated signal is doubled at the doubler circuit (Q0, Q0) and the.0 MHz frequency is picked up at the double tuned filter (L0, L0). The.0 MHz signal is applied to the RF circuit as a nd LO signal. -

15 -- R LO IRUIT (RF UNIT) The I (I0) generates a 0-bit digital signal using the MHz system clock. The digital signal is converted into an analog wave signal at the /A converter (R0 R0). The converted analog wave is passed through the bandpass filter (L0, L0, L0, 0, ) and then applied to the MAIN unit as the rd LO signal (.000 khz). -- MARKR IRUIT (RF UNIT) The signal divided at the circuit (I0) is used for the marker signals. The reference signal for the circuit (.0 MHz) is divided by to produce an acceptable frequency signal, MHz, with the programmable divider then divided again by 0 to obtain 00 khz cycle square-wave signals. The generated marker signals are output from pin of the I (I0) and then applied to the st mixer circuit (Q, Q) via the marker switch (I0) as the MKR signal. - ANTNNA TUNR IRUIT -- MATHING IRUIT (TUNR 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 unit; I) via the buffer amplifier (Q Q) ground one of the taps of L L, L, L and add capacitors ( ). After selecting the coils and capacitors, motors (MF, MF) adjust and using the antenna tuner PU (TRL unit; I) and the motor driver circuit (TRL unit; Q Q) to obtain a low WR (tanding Wave Ratio). -- TTOR IRUIT (TRL UNIT) () WR detector Forward and reflected power are picked up by a current transformer (L), detected by and, and then amplified at Ib and Ia, respectively. The amplified voltages are applied to the antenna tuner PU (I, pins, ). The antenna tuner PU detects the WR. () 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 rectified at. The rectified current is amplified at the -MO inverter amplifier (Ie) and buffer amplifier (Ia). The amplified signal is then applied to the phase comparator (Ia).RF voltage is detected by and rectified at. The rectified voltage is amplified at the -MO inverter amplifier (Ic) and buffer amplifer (Ib). The amplified signal is then applied to the phase comparator (Ib). The output signal from the phase comparator (Ia, pin for RF current, Ib pin for RF voltage) is rectified at and for conversion into voltage. The rectified voltages are combined, and amplified at Ib, then applied to the antenna tuner PU (I, pin ). A -MO inverter I is used for the buffer-amplifier (I) to improve functionable sensitivity. The -MO inverter amplifier is very responsive, and ensure quick and stable signal detection, even at a low RF signal level input. () Resistance components detector Resistance components are picked up by L, and detected by, and Q. The detected resistance components are amplified at the amplifier (Ia), and then applied to the antenna tuner PU (I, pin ). -- MOTOR ONTROL IRUIT The control circuit of the internal antenna tuner consists of the PU, PROM*, tuning motors and tuning relays. *lectronically-rasable Programmable Read Only Memory PLL circuit ANT RF signal st mixer Q, Q. MHz rystal filter RF unit nd mixer MAIN unit rd mixer I to unit Q0 Q Q Q or.. MHz Main loop PLL st LO PLL circuit I0 bit /A.0 MHz khz /N divider Phase detector PF PF Phase detector I0 / Q0 Ref. loop PLL Q0 Q0 /A I0 Reference oscillator X0:.0 MHz -

16 () PU and PROM (TRL unit) The antenna tuner PU (I) controls the tuning motors via the motor driver circuit (Q Q) and tuning relays directly, and memorizes the best preset position in 00 khz steps. The memory contents are stored in the PROM (I) without a backup battery. () Tuning motors (TRL unit) The motor driver circuit (Q Q) rotates the tuning motors (MF, MF) to obtain a low WR. () Tuning relays (TUNR unit) According to the operating frequency band and antenna condition, tuning relays select the capacitors ( ) and coils ( L L, L, L). -- ANTNNA TUNR PU PORT ALLOATION (TRL unit; I) Pin number,, 0 Port name AN AN AN0 PWR TI IKY IT THRU R TR XIN, XOUT NHF, O, O, O, I, I, I HF, M, M, M, 0M, M, M P0 P0 P0 P00 AN escription Input port for the resistance components detection voltage. Input port for the reflected RF power voltage. Inpout port for the forward RF power voltage. Input port for the transceiver power OFF. Input port for the reference voltage setting. Outputs tuner data signal. Input port for the serial signal. Outputs the [TUNR] ON/OFF signal. Input port for reset signal. Input port for the TX/RX switching signal. Input ports for the antenna tunner PU system clock. Output the capacitor selection signals. Output the coil selection signals. Output ports for the tuning motor (MF) drive signals. Output ports for the tuning motor (MF) drive signals. Input port for the reactance components detection voltage. - POWR UPPLY IRUIT -- PA UNIT Line H H H -- -LOGI OAR Line -- MAIN UNIT Line escription Receive converted from the line and R regulated by the R regulator circuit (Q, Q). T -- PLL UNIT Line PLL escription The voltage from an external power supply via the common filter circuit (FILTR board, L). The same voltage as the H line passed through a fuse. The same voltage as the H line passed through the switching relay (RL). The same voltage as the line passed through coils (L, L). ommon converted from the line and regulated by the + regulator circuit (I). ommon converted from the line and regulated by the + regulator circuit (I). ommon converted from the H line and regulated by the + regulator circuit (I). escription ommon converted from the line and regulated by the - converter (I0). Transmit converted from the line and regulated by the T regulator circuit (Q0, Q). escription ommon converted from the line and regulated by the regulator circuit (I0). -

17 TION AJUTMNT PROUR - PRPARATION FOR RIING RQUIR TT QUIPMNT QUIPMNT GR AN RANG QUIPMNT GR AN RNG Output voltage :. Frequency range : Hz power supply Audio generator urrent capacity : 0 A or more Measuring range : 00 m Measuring range : 0 00 W Frequency range : MHz tandard signal RF power meter Frequency range :. 00 MHz Output level : 0. µ to m generator (G) (terminated type) Impedance : 0 Ω ( to dm) WR : Less than. : igital multimeter Imput impeadance : 0 MΩ/ or beter Frequency range : MHz Frequency counter Frequency accuracy : ± ppm or better A millivoltmeter Measuring range : 0 m 0 ensitivity : 00 m or better voltmeter Input impedance : 0 kω/ or better Frequency range : MHz RF voltmeter ammeter Measurement capability: A/0 A Measuring range : Frequency range : At least 0 MHz Frequency range : 00 MHz pectrum analyzer FM deviation meter pectraum bandwidth : 00 khz or more Measuring range : 0 to ± khz Power attenuation : 0 or 0 d Frequency range : At least 00 MHz Attenuator Modulation analyzer apacity : 0 W or more Measuring range : 0 00 % Input impedance : Ω Frequency range : khz ±0 % xternal speaker istortion meter apacity : W or more Measuring range : 00 % Resistance : 0 Ω and 00 or Ω Frequency range : 0 MHz Terminator Oscilloscope apacity : 0 W or more Measuring range : ONNTION FM deviation meter tandard signal generator Modulation analyzer pectrum analyzer RF power meter istortion meter Attenuator to [P] to the antenna connector to [. ] Ammeter AUTION! O NOT transmit while an G is connected to the antenna connector. power supply peaker [ANT] [ANT] [ANT MHz] Audio generator + Terminator For entering the AJUTMNT MO, connected to [RMOT]. [MI] PTT -conductor. (d) mm ( ") horten inner and outer terminals. -

18 - PLL AJUTMNT AJUTMNT AJUTMNT ONITION UNIT MAURMNT LOATION ALU AJUTMNT POINT UNIT AJUT RN FRQUNY isplayed freq. : Any Preset R0 (RF unit) to the center position. Preset L0 (RF unit) approximate. mm downside from top of the coil s case. Receiving RF onnect an RF voltmeter to the check point P0. Maximum level (0 dm or more) RF L0, L0, Receiving onnect a frequency counter to the check point P MHz L0 (L0, R0 for critical adjustment) LPL LOK OLTAG O LOK OLTAG LO OUTPUT LL LO OUTPUT LL MARKR OUTPUT LL isplayed freq. : MHz Mode : U Receiving isplayed freq. :. MHz Mode : U Receiving isplayed freq. :. MHz Mode : U Receiving isplayed freq. :. MHz Mode : U Receiving isplayed freq. : MHz Mode : U Receiving isplayed freq. : MHz,. MHz MHz,. MHz MHz,. MHz MHz, MHz MHz, MHz, MHz Receiving isplayed freq. : Any Mode : U Receiving isplayed freq. : MHz Mode : W Marker : ON Receiving RF RF RF RF FRONT onnect a digital multimeter or oscilloscope to the check point P0 (L). onnect a digital multimeter or oscilloscope to the check point P0 (L). onnect an RF voltmeter to the check point P00. onnect an RF voltmeter to the check point P0. isplay.0.0 dm or more dm or more or more (-meter level) RF RF 0 0 erify erify erify -

19 R0 Reference frequency adjustment P0 Reference frequency check point P00 st LO outoput level check point Reference frequency adjustment O lock voltage adjustment L0 L0 L0 L0 0 P0 rd LO output level check point P0 (L) O lock voltage check point 0 LPL lock voltage adjustment P0 (L) LPL lock voltage check point -

20 - TRANMITTR AJUTMNT AJUTMNT ILING URRNT (for driver) (for HF/0 MHz band final amplifier) (for MHz band final amplifier) M PAK TX PAK TRANMITTR TOTAL GAIN Ic AP isplayed freq. : MHz Mode : U [MI GAIN] : Max.W [RF POWR] : Max. W [TUNR] : OFF Preset R, R, R0, R0, R (PA unit) to max. counter clockwise. Transmitting Transmitting Transmitting AJUTMNT ONITION Transmitting isplayed freq. : MHz Mode : U Transmitting Transmitting isplayed freq. : MHz Mode : RTTY Transmitting isplayed freq. : MHz Mode : U et following controls as: [RF POWR] : Max. W [MI GAIN] : enter [KY P]: enter [PITH] : enter isconnect P (PA unit) from J (RF unit). onnect an audio generator to [MI] connector and set as: Frequency :. khz Level : mrms Transmitting isplayed freq. : MHz Mode : U onnect an audio generator as: Frequency :. khz Level : mrms Transmitting Transmitting isplayed freq. : MHz Mode : U [MI GAIN] : enter onnect an audio generator to [MI] connector and set as: Frequency :. khz Level : mrms Transmitting Mode : RTTY onnect P00 to. Transmitting on the maximum TX current band. UNIT PA Rear panel RF Rear panel Rear panel Rear panel MAURMNT LOATION onnect an ammeter between the power supply and the transceiver. onnect an RF power meter to the [ANT MHz] connector. onnect a digital multimeter or oscilloscope to the check point J. After adjustment, re-connect P (PA unit) to J (RF unit). onnect an RF power meter to the [ANT] connector. onnect an RF power meter to [ANT] connector. onnect an ammeter between power supply and the transceiver. ALU Measure the driving current, and note it as the "initial value." +. A more than initial value +00 ma more than step "" +00 ma more than step "" +00 ma more than step "" +00 ma more than step "" After adjustment, disconnect the ammeter between the power supply and the transceiver. Maximum output power Maximum output Level 0 W Max. output power 0 W A AJUTMNT POINT UNIT PA PA RF Front panel MAIN MAIN MAIN AJUT R R R0 R0 R 0 Adjust in sequence L, L, L, L several times. [MI GAIN] control L0 R R -

21 L 0 TX peak adjustment R0, R Idling current adjustment for MHz band final amplifier R, R0 Idling current adjustment for HF/0 MHz bands final amplifier R Idling current adjustment for driver J TX peak check point TX peak adjustment L L L L L0 TX peak adjustment R Transmitter total gain adjustment R Ic AP adjustment -

22 TRANMITTR AJUTMNT continued AJUTMNT HF AN OUTPUT POWR 0 M AN OUTPUT POWR M AN OUTPUT POWR AM ARRIR AM MOULATION FM IATION RIUAL AM WR TTOR AJUTMNT ONITION isplayed freq. :.0000 MHz Rear Mode : RTTY panel [RF POWR] : Max. W [TUNR] : OFF Transmitting isplayed freq. : MHz Rear Mode : RTTY panel [RF POWR] : Max. W [TUNR] : OFF Transmitting isplayed freq. : MHz Rear Mode : RTTY panel [RF POWR] : Max. W [TUNR] : OFF Transmitting isplayed freq. :.0000 MHz Rear Mode : AM panel [RF POWR] : Max. W [MI GAIN] : enter Apply no audio signals to [MI] connector. Transmitting isplayed freq. :.0000 MHz Rear Mode : AM panel [MI GAIN] : enter [RF POWR] : Max. W onnect an audio generator to [MI] connector and set as: Frequency : khz Level : 0 mrms Transmitting isplayed freq. :.0000 MHz Rear Mode : FM panel Tone : OFF [RF POWR] : Max. W [MI GAIN] : enter onnect an audio generator to [MI] connector and set as: Frequency : khz Level : 0 mrms Transmitting isplayed freq. : MHz Rear Mode : FM panel Tone : OFF [RF POWR] : Max. W [MI GAIN] : enter onnect an audio generator to [MI] connector and set as: Frequency : khz Level :. khz deviation at the connected deviation meter. Transmitting isplayed freq. :.0000 MHz TRL Mode : FM [RF POWR] : Max. W [TUNR] : OFF (Through) onnect P (TI) on the TRL unit to. onnect a 0 Ω dummy load or an RF power meter to [ANT] connector. Transmitting After adjustment, disconnect P (TRL unit) from. AJUTMNT MAURMNT ALU POINT UNIT LOATION UNIT AJUT onnect an RF power meter to [ANT] connector. onnect an RF power meter to [ANT] connector. onnect an RF power meter to [ANT MHz] connector. onnect an RF power meter to [ANT MHz] connector. onnect a modulation analyzer to [ANT] connector through an attenuator. onnect an FM deviation meter to [ANT] connector through an attenuator. onnect an FM deviation meter to [ANT MHz] connector through an attenuator. onnect a digital multimeter or oscilloscope to the check point P. 00 W 00 W 00 W 0 W 00% or less. khz ±0. khz Minimum RIUAL AM level Minimum voltage MAIN MAIN MAIN MAIN RF TRL R0 R R R0 erify erify L, L, -

23 R0 HF bands output power adjustment Residual AM adjustment R 0 MHz band output power adjustment L L R MHz band output power adjustment R0 AM carrier power adjustment WR detector adjustment P WR detector check point P (TI) WR detector pre-setting -

24 - RIR AJUTMNT AJUTMNT AJUTMNT ONITION UNIT MAURMNT LOATION ALU AJUTMNT POINT UNIT AJUT RX PAK isplayed freq. : MHz Mode : U et following selections, controls and functions as: [RF/QL] : enter [PITH] : enter [AG]: OFF, [ATT] : OFF [N] : OFF, [RIT] : OFF PT : enter, PT : enter [P.] : P. IF Filter :. khz [NR] switch : OFF [NOTH] switch: OFF Preset L (RF unit) to rotation downside from top of the coil s case. onnect an G to [ANT] connector and set as: Frequency :.000 MHz Level : 0 µ* ( dm) Modulation : khz/±. khz dev. Receiving Filter : khz et an G as : Frequency : MHz Level : m* ( dm) Modulation : khz/±.0 khz ev. Receiving Rear panel onnect an A millivolt meter to [XT P] connector with an Ω load. Maximum audio output level RF L, L, isplayed freq. : MHz et an G as : Level : OFF Receiving onnect an A millivolt meter to [XT P] connector with an Ω load. Minimum noise output level R RIR TOTAL GAIN isplayed freq. : MHz Mode : U Filter :. khz [P.] : OFF et an G as : Frequency :.000 MHz Level : 0 m* ( dm) Modulation : khz/±.0 khz dev. Receiving MAIN onnect an oscilloscope to the check point P0..0 p-p MAIN R NOI LANKR isplayed freq. : MHz Mode : U [P.] : P. [N] : OFF [N LL] : 0% et an G as : Frequency :.000 MHz Level : µ* ( dm) Modulation : OFF and apply following signal to [ANT] connector. MAIN onnect an oscilloscope to the check point P00. Maximum noise level MAIN L0, L0, L0, 00 msec. msec. Preset R00 (MAIN unit) to the o clock position. Receiving [N] : ON Receiving *This output level of a standard signal generator (G) is indicated as G s open circuit. At the point where the voltage just reduces. R00 -

25 RX peak adjustment L L L L R L0 L0 L0 R00 Noise blanker adjustment R Receiver total gain adjustment L RX peak pre-setting -

26 - AJUTMNT MO AJUTMNT AJUTMNT ONITION IPLAY OPRATION NTRING AJUTMNT MO TX AJUTMNT nter the adjustment mode: q Turn power OFF. w Terminate the [RMOT] jack with a.(d) mm mini-plug. e While pushing [MNU] and [], turn power ON. onnect an RF power meter to [ANT] connector and [ANT M] connector. onnect a 00 Ω or Ω dummy load to [ANT] connector. onnect an audio generator to [MI] connector and set as: Frequency :. khz Level : 0 mrms TX RX.0-0 Push [F (TX)] or [F (RX)] to select each adjustment mode. Once enterring adjustment mode, use [F ( )] to skip items, or [F ( )] to return the opening display. AUTION: NR select ajustment items [F- (TX)] while transceiver is connected to an G. ecause transceiver automatically transmits when most transmit items in the [F- (TX)] is selected TX RX.0-0 POWR HF/0M 0% chk T Push [F (TX)] to enter the TX adjustment. Push [F (T)] to set and to step next. POWR HF Tuner chk T POWR HF 0% chk T POWR HF 0% chk T POWR HF 00% chk T POWR 0M Tuner chk T POWR M 0% chk T et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR HF Tuner meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR HF 0% meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR HF 0% meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR HF 00% meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR 0M Tuner meter into memory, and to step next. Push [F (T)] to set and to step next. 0 POWR M 0% chk T POWR M 0% chk T POWR M 00% chk T et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR M 0% meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR M 0% meter into memory, and to step next. et the output power to 0 W using [MAIN IAL]. Then push [F (T)] to store the POWR M 00% meter into memory, and to step next. - 0