Top cover 10 pieces Addresses are provided on the inside back cover for your convenience. Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.
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SECTION 1 SPECIFICATIONS M GENERAL • Frequency coverage : 380.000–430.000 MHz [USA-03] 450.000–512.000 MHz [USA-01], [USA-02], [USA-04] 450.000–520.000 MHz [GEN-01], [GEN-02] 350.000–390.000 MHz [GEN-04] 400.000–470.000 MHz [others] • Mode : FM • Type of emission : Wide: 16K0F3E (25.0 kHz) Middle: 14K0F3E (20.0 kHz) Narrow: 11K0F3E/8K50F3E (12.5 kHz) •...
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SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW AF amplifier +5 Regulator APC amplifier (IC15: TA7368F) (IC17: NJM2870) (IC16: TA75S01F) IF amplifier Mute switch TX/RX switch (Q7: 2SC4215 O) (D29: MA2S111) IF IC D16: 1SV307 D17: MA2S077 (IC9: TA31136FN) VCO circuit PLL IC...
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SECTION 3 DISASSEMBLY INSTRUCTION • REMOVING THE CHASSIS UNIT • REMOVING THE PA UNIT 1 Unscrew 1 nut A, and remove 2 knobs B, C. 1 Unscrew 3 screws M. 2 Unscrew 2 screws D. 2 Unsolder 4 points N, and take off the PA unit in the 3 Unscrew 2 screws E.
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SECTION 4 OPTIONAL UNIT INSTALLATION l l a o l l l l a fl fl u l l o l l , s i t f i l s ’ t ™ ™ next page. n i l , t f a l i above.
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n i l above. - r i a l l o i t l l a l l a above. ™ 4 - 2...
SECTION 5 CIRCUIT DESCRIPTION 5-1 RECEIVER CIRCUITS The RF signals from the bandpass fi lter are mixed with the 1st LO signals, where come from the RX VCO circuit via the 5-1-1 ANTENNA SWITCHING CIRCUIT (PA UNIT) low-pass filter (L46, C396, C397), at the 1st mixer circuit The antenna switching circuit functions as a low-pass fi...
The 2nd IF signal from the 2nd mixer (IC9, pin 3) passes The “NOIS” signal from the FM IF IC is applied to the CPU through the ceramic filter (FI2) to remove unwanted (IC22, pin 75). Then the CPU analyzes the noise condition heterodyned frequencies.
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5-2-3 DRIVE/POWER AMPLIFIER CIRCUITS posed of microphone amplifier, compressor, scrambler, (PA UNIT) limiter, splatter fi lter, MSK modulator, etc. at the microphone amplifi er section. The drive/power amplifi er circuits amplify the VCO oscillating signal to an output power level. The AF signals (MIC) from the microphone (MC1) are applied to the amplifier (IC23, pins 6, 7).
5-3-2 VCO CIRCUITS (MAIN UNIT) (MAIN unit; IC16; pin 3), and the “T2” signal from the D/A converter (MAIN unit; IC12, pin 23), controlled by the CPU The VCO circuits contains a separate RX VCO (Q17, D9, (MAIN unit; IC22), is applied to the other input for reference. D11) and TX VCO (Q16, D10, D12, D13).
5-6 PORT ALLOCATIONS 5-5 OTHER CIRCUITS 5-6-1 D/A CONVERTOR IC (IC12) 5-5-1 COMPANDER CIRCUIT (MAIN UNIT) IC-F43GT/GS/F44GT/GS have compander circuit which can Port improve S/N ratio and become wide dynamic range. The Description number name circuit is composed in the base band IC (IC14).
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5-6-2 CPU (MAIN unit; IC22) Port Port Description Description number name number name 13, 15, CENC0– Output the CTCSS/DTCS signals. Input port for the PTT switch detection CENC2 signal. Low: While switch Outputs the reference oscillator cor- pushed. recting voltage. The voltage is applied to the buffer amplifier (IC24, pin3).
SECTION 6 ADJUSTMENT PROCEDURE 6-1 PREPARATION When adjusting IC-F43GT/F43GS/F44GT/F44GS, the optional CS-F33G ADJ (Rev. 1.0 or later), OPC- ADJUSTMENT SOFTWARE OPC-478U and a JIG CABLE (see illustration at page 5-3) are CLONING CABLE (RS-232C type), CLONING CABLE (USB type) required.
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• CS-F33G ADJ’S SCREEN EXAMPLE NOTE: The above values for settings are example only. Each transceiver has its own specific values for each setting. q: Transceiver’s connection state !1 : CTCSS/DTCS deviation w: Reload adjustment data !2 : Squelch level e: Receive sensitivity measurement !3 : Reference frequency r: Connected DC voltage measurement...
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• CONNECTION AC millivoltmeter To [MIC] Audio generator to the antenna connector Standard signal generator Personal 0.1 µV to 32 mV computer (–127 dBm to –17 dBm) CAUTION! DO NOT transmit while an SSG is connected to the antenna connector. OPC-478 to RS-232C port Attenuator...
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6-2 SOFTWARE ADJUSTMENT (TRANSMITTING) Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION PLL LOCK • Operating CH : CH1 Check the “LVIN”...
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SOFTWARE ADJUSTMENT (RECEIVING) • Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard. • Need to adjust “S-METER ADJUSTMENT” after “RX SENSITIVITY ADJUSTMENT” is adjusted. Otherwise, “S-METER ADJUSTMENT” will not be adjusted properly. MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITION...
SECTION 7 PARTS LIST [MAIN UNIT] [MAIN UNIT] S.=Surface mount M.=T: Mounted on the Top side, B: Mounted on the Bottom side ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 1110006350 S.IC LM2902PWR 55.4/23.8 6200007921 S.COL ELJRF 15NJFB 80.1/24 1110005771 S.IC S-80942CNMC-G9CT2G 20.8/41.5 6200007901 S.COL ELJRF 22NJFB 75.1/30.2...
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[MAIN UNIT] [MAIN UNIT] S.=Surface mount M.=T: Mounted on the Top side, B: Mounted on the Bottom side ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 7030005000 S.RES ERJ2GEJ 471 X (470) 69/34.6 R256 7510001730 S.TMR ERTJOEP 473J 20/32.9 7030009270 S.RES ERJ2GEJ 821 X (820) 73.1/30.9 R257 7030005090 S.RES ERJ2GEJ 104 X (100 k)
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[MAIN UNIT] [MAIN UNIT] S.=Surface mount M.=T: Mounted on the Top side, B: Mounted on the Bottom side ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C133 4030017640 S.CER ECJ0EC1H150J 70.3/24.3 4550007120 S.TAN F92 1D 224MPA 78/26.3 C134 4030017630 S.CER ECJ0EC1H120J e, t, u, !3 , !5 , !7 4030017510 S.CER ECJ0EC1H680J 98.2/34.9 69.9/31.8...
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[MAIN UNIT] [MAIN UNIT] S.=Surface mount M.=T: Mounted on the Top side, B: Mounted on the Bottom side ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C314 4030017740 S.CER ECJ0EB1E821K 55.2/18.7 5010000160 S.LED LNJ310M6URA 57.3/6 C315 4030017330 S.CER ECJ0EF1C104Z 49.2/20.6 5010000160 S.LED LNJ310M6URA 57.3/39.4 C316...
SECTION 8 MECHANICAL PARTS [CHASSIS PARTS] [PA UNIT] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6910015910 ANT CONNECTOR 104 J701* 6510024391 IMSA-6176S-03Y902 6910015860 IMSA-6277S-O2A-G J702 6910015891 9230B-1-02Z140-PT1 2510001061 K036NA500-67 F701* 5210000901 0467003.NR 8900009640 OPC-963 MP701* 8410002370 2337 PA HEATSINK 8010019454 2721 CHASSIS-4 8210020531 2721 T-FRONT PANEL-1 [FUSE UNIT] (Inc.
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MP25 ( C ) SP1 ( C ) MP30 ( C ) MP13(C) MP29 ( C ) W1 ( C ) J1(C) MP36(C) MP35(C) MP2 ( C ) MP8(C) MP31(C) MP20 ( C ) MP33 ( C ) MP12 ( C ) MP1(C) MP12 ( C ) MP17(C)
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SECTION 9 BOARD LAYOUTS • MAIN UNIT (TOP VIEW) SP1 (CHASSIS) • PA UNIT (TOP VIEW) AFOUT CLONE MICG C766 C767 D705 C763 • BC-160 (TOP VIEW) L707 • ANT UNIT (TOP VIEW) C762 EP711 C742 Q703 • FUSE UNIT (TOP VIEW) R712 L703 D701...
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SECTION 11 VOLTAGE DIAGRAM TONE EVQ–PUL 02K @compC C131 0.1 IC13 R514 R510 R120 R151 C170 TC4W53FU 100 k 47 k 47 k 47 k C136 100 P 33 k R122 R154 120 k R121 220 k EMER 68 k R291 R219 CP45...
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[H]: High–band. [L]: Low–band. TPC6103 C: 4.0 RX VCO 2SC4116 BL C: 3.9 C404 0.01 CR–781 15.3MHZ C: 3.8 6.8 k 6.8 k R103 220 k IC24 VCON C126 R304 T: 2.0 2SK880 Y R104 100 k TA75S01F 12 P ERJ2GE–JPW R: 0.0 R516 100 k...
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