AFJIC-T7HAmateur Radio Equipment

INSTRUCTION MANUAL This device complies with Part 15 of the FCC rules. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. DUAL BAND FM TRANSCEIVER iT7H RWARNING! NEVER hold the transceiver so that the antenna is very close to, or touching exposed parts of the body, especially the face or eyes, while transmitting. The transceiver will perform best if the microphone is 5 to 10 cm (2 to 4 in) away from the lips and the transceiver is vertical. RWARNING! NEVER operate the transceiver with a headset or other audio accessories at high volume levels. Hearing experts advise against continuous high volume op- eration. If you experience a ringing in your ears, reduce the volume level or discontinue use. NEVERconnect the transceiver to an AC outlet or to a power source of more than 16 V DC. Such a connection will damage the transceiver. NEVERconnect the transceiver to a power source that is DC fused at more than 5 A. Accidental reverse connection will be protected by this fuse, higher fuse values will not give any pro- tection against such accidents and the transceiver will be ruined. NEVERattempt to charge alkaline or dry cell batteries. Be- ware that external DC power connections will charge batteries inside the battery case. This will damage not only the battery case but also the transceiver. i IMPORTANT READ ALL INSTRUCTIONS carefully and completely before using the transceiver. SAVE THIS INSTRUCTION MANUAL—This instruction man- ual contains important operating instructions for the IC-T7H. EXPLICIT DEFINITIONS The explicit definitions below apply to this instruction manual. CAUTIONS WORDDEFINITION RWARNING Personal injury, fire hazard or electric shock may occur. CAUTION Equipment damage may occur. NOTE If disregarded, inconvenience only. No risk of personal injury, fire or electric shock. The IC-T7H complies with essential requirements of the 89/336/EEC directive for Electromagnetic Compatibility. This compliance is based on conformity with the ETSI specification ETS300 684 (EMC product standard for Commercially Available Amateur Radio Equipment). ii UNPACKING Accessories included with the transceiver:Qty. ÀAntenna ............................................................................1 ÁHandstrap .........................................................................1 ÂBattery pack (BP-173/BP-180) or battery case (BP-170) attached to the transceiver................................................1 ÃBelt clip .............................................................................1 ÄWall charger* ....................................................................1 *Not supplied with battery case versions. Antenna for U.S.A. version differs from that shown above. DO NOT push the PTT when not actually desiring to trans- mit. DO NOT operate the transceiver near unshielded electrical blasting caps or in an explosive atmosphere. AVOID using or placing the transceiver in direct sunlight or in areas with temperatures below –10°C (+14°F) or above +60°C (+140°F). Place unit in a secure place to avoid inadvertent use by chil- dren. The use of non-Icom battery packs/chargers may impair transceiver performance and invalidate the warranty. Even when the transceiver power is OFF, a slight current still flows in the circuits. Remove the battery pack or case from the transceiver when not using it for a long time. Otherwise, the battery pack or installed dry cell batteries will become ex- hausted. For U.S.A. only CAUTION:Changes or modifications to this device, not ex- pressly approved by Icom Inc., could void your authority to operate this device under FCC regulations. À Á Â Ã Ä TABLE OF CONTENTS iii IMPORTANT ........................................................................ i EXPLICIT DEFINITIONS ..................................................... i CAUTIONS .......................................................................... i UNPACKING ....................................................................... ii TABLE OF CONTENTS ..................................................... iii 1 PANEL DESCRIPTION ............................................ 1 – 5 nSwitches, controls, keys and connectors ................... 1 nFunction display ......................................................... 5 2 BATTERY PACKS AND ACCESSORIES ................ 6 – 9 nBattery pack charging ................................................ 6 nCharging precautions ................................................. 6 nAbout the battery pack ............................................... 6 nCharging connections ................................................ 7 nBattery case ............................................................... 8 nAccessory attachment ................................................ 9 3 BASIC OPERATION ............................................ 10 – 14 nPower ON ................................................................. 10 nSetting a frequency .................................................. 10 nSetting tuning steps .................................................. 11 nSelecting a memory channel .................................... 12 nLock function ............................................................ 12 nReceive and transmit ................................................ 12 nRepeater operation .................................................. 13 4 ADVANCED FUNCTIONS ................................... 15 – 22 nMemory/call channels .............................................. 15 nDTMF memory operation ......................................... 17 nScan operation ......................................................... 18 nSubaudible tone operation ....................................... 21 5 OTHER FUNCTIONS ........................................... 23 – 26 nInitial set mode ......…

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0 -_ ,. .: ,,( Application for Equipment Certification FCC Identifier AFJIC-T7H December 8, 1998 Scanning Receiver Statement for Compliance with 5 2.1033 (b) (12) The equipment under application herein incorporates a scanning receiver. Accordingly, $ 15.121 of the Commission’s rules applies. The equipment under application herein is incapable of operating (tuning), or being readily altered by the user to operate within the frequency bands allocated to the Domestic Public cellular Radio Telecommunications Service (“Cellular Radio Service”). The equipment is also incapable of converting digital cellular transmissions to analog voice audio. The receiver portion of the equipment under application herein scans two bands 136-174MHz, 400-470MHz, and the receiver does not scan the bands used by the Cellular Radio Service, 824-849 and 869-894MHz. The receiver portion of the equipment under application cannot be altered to enable it to scan the Cellular Radio Service bands by means of clipping the leads of or installing a diode, resistor and/or jumper wire, or other such simple component. Nor can the receiver be made to scan the Cellular Radio Service bans by replacing a plug-in semiconductor chip, since no such plug-in chips are utilized. The semiconductor chips that are utilized in the equipment cannot be erased and reprogrammed. The equipment has no circuitry capable of connecting any digital signals into analog voice audio. In view of the above, the equipment complies with 15.121 of the Commission rules. Sincerely yours, ICOM Incorporated Masaaki Takahashi Manager, New Product Development First in Communications

SECTION 10 BLOCK DIAGRAM 10 - 1 D51: MA2S077D52: MA2S077 PA BOARD VT4CTRL Q705: 2SA1588 VT4 D703: MA2S111 Q202: 2SA1588 T4REG +3CVCC BANDSEL TXSEL Q203: UN9210 T4 Q304: 2SC5108Q305: 2SC5108 DUAL VCO BOARD Q702: 2SB1132Q703: 2SD2216D702: MA133 VHFSHIFTSW Q354: UN9210 SHIFT Q353:UN9115 LVCO+3C Q357:UN9115 LVCOCTRL Q853:UN9115 VCOCTRL D354:MA132WA HVCOCTRL HVCO Q854:UN9210 UHFSHIFTSW V VCOU VCO Q301: 2SC5006Q302: 2SC5006D302: MA2S077D301: HVU350 Q306: 2SC5108 Q351: 2SC5107 T4CTRL TXC Q704:UN9211 D353: MA2S077 Q852: 2SC4403 UT4CTRL D352: MA2S077D351: MA2S077 Q701:2SC3356 Q201:2SC3356 BANDSW VCC1 VGG1VGG2 D201: MA2S077 Q401: 2SK3074 Q402: 2SK3075 VOUT UOUT VCC2 D551: MA2S077Q204: UN921L D722: 1SV271 TX RX VERSION VERSION 144~146430~440 EUR APCSENS Q201:2SC4226 FI201: EFCH445MWN [USA-3] EFCH435MWN [other] R250: 0.15 1W APCSET VCC IC301: TC4W53FUQ305: UN9210Q306: UN9213Q307: XP1114Q308: XP1213Q309: UN9114Q310: UN9210 D301: MA2S111D302: MA2S111 Q250: 2SC4081Q253: DTC114TUD250: MA8030 VCC APC Q255: 2SB1462D251: MA8043 VCC Q202: 2SC4403 IC250: NJM2904M Q400:2SC5107 FI101: CFWM450E PLL IC IC851: UPD3140GS X851: CR-515 Q352: 2SC5107 REF 15.2MHz TUNECTRL Q355:2SK880 Q356: 2SC4081 15.2MHz Q4: XP1501Q5: 2SA1588D402: MA132WA IF IC 45.6MHz IC101:TA31136FN 2NDLO DCSW CHG HV FI401:FL-244 Q101:2SC4215 Q901: 2SB1132D902: MA133D904: SB07-03C IF: 45.15 MHz D903: MA2S728Q902: HAT1024R Q401:2SC4403 D54: MA304 Q51: 2SC5226 D53: MA304 Q52: 2SC4403 ITA SEA 136~174400~470140~150430~440 USA-3 EUR ITA SEA USA-3 IC151: TA7368F 2F UNIT (TO BATT) + VCC Q10:2SJ364 Q12: XP6501 CTCIN R3.5 IC13:NJM2904M IC12:BA4510F VCC R3REG +3C +3C VCC MICAMP MUTESW IC12:BA4510F Q31:UN9211 D901: RB060L-40 HV REVERSVOLTPROTECT MC1:EM-123TH S2: JPM1990-2013R SP1:CS028014-12 TXSENS +3CPUREG VCC IC2: S-81335HG-KI RESET +3CREG VCC +3C Q4: XP1501Q5: 2SB1132Q40: UN9213D3: MA2S111 D19: MA2S111Q42: UN9211IC3: S-80730SL-AT LEDDRIVER LEDDRIVER VCC VCC 5.039MHz X1: CR-534 Q34: UN9215Q36: UN9215Q44: UN9215 Q1: UN9210D1: MA2S111 LIGHT NOISE DS2: LNJ310M6URADS1: LNJ310M6URA DS3:LT1EPS3A AFREG VCC AFON Q151: 2SB1201Q152: XP1501 VOL 1F UNIT TP96D96E20-15F10KA SENS INITIALMATRIX KEY CPU EEPROM IC1 M38267M8L-219GP [USA-3] onlyM38267M8L-155GP [Other] DS4: LD-BU4323J CTCOUT DTMF Q32:2SB1462 LOGIC UNIT LCD IC15: X25080SI-2.7 D303: MA304D304: MA2S077 BUFF LOOPFILLOOPFIL BUFF x3 LPF MIC PROTECT D4:MA8051 MICREG Q30:UN9115 -3C LPF LPF CTCREG BPF DRIVEAMP AFMUTE DETSW IFAMP XTALBPF LOAMP BPF RX LOFREQUENCY LOAMP LOAMP TXSW RXSW BUFFBUFF AF AMP Q35: UN9215 BPF BPF BPF RFAMP RFAMP RFAMP D52: MA304 APCCTRL DRIVEAMP PWRAMP LPF HPF D701: MA2S077 LPF LPF HPF TXSW ANTSW ANTSW D724: 1SV308D723: 1SV308D552: MA2S077 LIMITTER LIMITTER CLONESW VR3VREG UR3VREG Q404: UN9115D400: MA2S077 D202: MA2S077Q403: UN9115D203: MA2S077 R3.5 VR3 VR3V R3.5 UR3 UR3V Q45:UN9115 IC102: TC4S66F COMMONRXDATA BUSTX 144~148430~450 144~146430~440136~174400~470118~174430~440118~174400~470 FREQUENCY RX LOFREQUENCY 189.15~191.15384.85~394.85181.15~219.15354.85~424.85163.15~219.15354.85~424.85163.15~219.15384.85~394.85 D202: MA2S077 VT4 D725: 1SV271 D201: 1SV271 D55: 1SV271 REMOTE T4 D6: MA2S111D7: MA2S111D8: MA2S111 ANT SECTION 11 VOLTAGE DIAGRAM 11 - 1 • LOGIC UNIT SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 C1 C2 C3 C4 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 10 20 21 22 23 24 25 26 27 28 29 35 36 30 31 32 33 34 DS4 LD-BU4323J COM0 COM1 COM2 COM3 CLONEOUT CLONEIN D1 MA2S111 Q1 UN9210 R215 k VIN REMOTE C212 0.001C213 0.001C214 0.001C215 0.001 123456789101112131415161718192021222324252627282930 J1 08-6210-030-800 AFMODPLCKUR3LVCO+3C800300PLSTDICKDIUDVR3REMOTEPDA/UL C211 0.001 C1660.001 C1670.001 SP1CS028014-12 R221330 k R22268 k VCC +3C C2090.001 R11 10 k C210.1 C180.001 D3 MA2S111 R1210 k C220.001 3 2 1 5 Q4 XP1501 AB C190.01 C1680.001 Q5 2SB1132 R C17100 R2241 M R207220 k C2022 C2347 IC2 S-81335HG-KI R1904.7 k 1 VDD 2 VSS 3 NC 4 NC 5 IC3S-80730SL-AT C150.001 AFON AM UR3 H/L 300 800 C157 0.1 Q42 UN9211 D19MA2S111 +3CPU+3C P67/AN7 P66/AN6 P65/AN5 P64/AN4 P63/SCLK22/AN3 P62/SCLK/21AN2 P61/SOUT2/AN1 P60/SIN2/AN0 1 2 3 4 5 6 7 8 P57/ADT/DA2 9 P56/DA1 10 P55/CNTR1 11 P54/CNTR0 12 P53/RTP1 13 P52/RTP0 14 P51/PWM1 15 P50/PWM0 16 P47/SRDY1 17 P46/SLCK1 18 P45/TXD 19 P44/RXD 20 P43/ /TOUR 21 P42/INT2 22 P41/INT1 P40 P77 23 24 25 VL1 100 C1 99 C2 98 VL2 97 VL3 96 COM0 95 COM1 94 COM2 93 COM3 92 AVSS 91 VREF 90 VCC 89 SEG0 88 SEG1 87 SEG2 86 SEG3 85 SEG4 84 SEG5 83 SEG6 82 SEG7 81 SEG8 80 SEG9 79 SEG10 78 SEG11 77 SEG12 76 P76 26 P75 27 P74 28 P73 29 P72 30 P71 31 P70/INT0 32 RESET 33 XCIN 34 XCOUT 35 XIN 36 XOUT 37 VSS 38 P27 39 P26 40 P25 41 P24 42 P23 43 P22 44 P21 45 P20 46 P17 47 P16 48 P15/SEG39 49 P14/SEG38 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 IC1M38267M8L-219GP [USA-3]M38267M8L-155GP [Other] C50.001 R21010 k C60.1 R230100 k CONT C2100.001 R19747 k R20947 k SEG12SEG11 COM3COM2 RESETVR3LVCOMM/RMBLEDI1I2KR0KR3SHIFTHVCOTXSELMICCLIGHTPTTCFC C15627 P X1CR-534 R22010 k C15524 P ESIO Q40UN9213 CS 1 SO 2 WP 3 VSS 4 SI 5 SCK 6 HOLD 7 VCC 8 IC15 X25080SI-2.7 PCON R205100 k R2341 M ESIO C870.001 C2030.001 R2331 M Q45 UN9115 R1871 M R186470 k C2080.001 HVCODETONOISEGNDGNDH/LSDTXSEL C200 0.001C201 0.001C202 0.001C216 0.001C217 0.001 R2161 M R211470 k R21582 k R21482 k R21382 k 1 5 6 7 8 IC13 NJM2904M R241100 k C1810.01 C1800.1 C1720.1 R2192.2 M C1730.0022 C1690.0015 C1700.1 C1710.039 C179100 P R183100 DS3LT1EP53A R240120 k R242470 k C1780.1 R208100 R184100 DS2LNJ310M6URA DS1LNJ310M6URA R185100 Q36UN9215 Q44UN9215 Q34 UN9215 Q35 UN9215 ECSECK DIUD DICK POWER I3 CONT KS0KS2KS3KS1KS4 CLONEIN CLONEOUT C2040.001 R2234.7 k C2050.001 C174 0.01C175 0.1 CTCIN VIN CTCOUT NOISE LOCK KS1 KS0 KS2 KS3 KS4 DTMF PCON PDA/UL PLST…

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I I lcom ,4merica, Inc. j Coworate Headquarters / 2380116thAve NE Bellevue, Washington 98004 Phone. (425) 454-8155 Fax (425) 454-1509 / Customer Servrce (425) 454-7619 December 8, 1998 Federal Communications Commission EQUIPMENT APPROVAL SERVICES PO Box 358315 Pittsburgh, PA 15251-3315 Attention: Authorization & Evaluation Division Applicant: ICOM INCORPORATED Equipment: FCC ID: AFJIC-T7H FCC Rules: Part 15.37 (B) (New) Gentlemen: On behalf of the Applicant, enclosed please find the Application Form Test Data Report and all pertinent documentation, the whole for certification of the referenced equipment as shown. Filing fees are attached to the Fee Processing Form. Should you need any further information, kindly contact the writer who is authorized to act for the Applicant. Best regards Masaaki Takahashi Manager, New Product Development MT: sg Enclosures First in Communications CANADA SALES/SERVICE OFFICE 3071 -:5 Road,Unit9, Richmond. B.C., CanadaV&X2T4 (604)273-7400 FAX (504)273-1900

/ ICOM America, Inc. I 1 Coruorate Headquarters / 2380 ‘16th Ave N E. / / Beliewe, Washpgcn 98004 Phone (425) 454-8155 1 Fax (425) 454-1509 1Customer Servce (425) 454-7619 December 8,1998 Federal Communications Commission Authorization & Evaluation Division 7435 Oakland Mills Road Columbia, Maryland 21046 Gentlemen: This is to advise that we are in full compliance with the Anti-Drug Abuse Act. The Applicant is not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 12 USC 862, and no party to the application is subject to a denial of federal benefits pursuant to that section. Sincerely, ICOM America, Inc. Masaaki Takahashi Manager, New Product Development MT: smg First in Communications CANADA SALES/SERVICE OFFICE 3071 - pt5 Road, Unit 9, Richmond, B.C., Canada V5X 2T4 (604) 273-7400 FAX (604) 273-1900

1. SERIAL NUMBER PLATE. ‘0 ICOM IGT7H . -. _ FCC ID:AFJ IC-T7H td%i i!ziN CONTAINS NICKEL- CADMIUM BATTERY. MUSTBE RECYCLED OR DISPOSED OF PROPERLY. 2. PICTURE OF TRANSCEIVER SHOWING LOCATION OF ABOVE PLATE. 3. VERBAL DESCRIPTION OF WHERE THE LABLE IS LOCATED. LOCATION OF THE FCC SERIAL NUMBER PLATE IS ON THE REAR CASE OF CENTER PART OF THE TRANSCEIVER. T.Tsujiuchih ?Asa Director of Engineering Dept .2 Oct.15.1998 SIGNATURE TITLE 1. FCC PART 15 INDICATION. -. - This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 2. THE LOCATION OF ABOVE INDICATION. a. DUAL BAND FM TRANSCEIVER IC-T7H lcom Inc. 3. VERBAL DESCRIPTION OF WHERE THE LABLE IS LOCATED. THE FCC PART 15 INDICATION IS FORNT OF THE INSTRUCTION MANUAL OF CENTER POSITION. L T.Tsujiuchi of Engineering Dept.2 Oct.15.1998 SIGNATURE TITLE DATE

SECTION 4CIRCUIT DESCRIPTION 4 - 1 4-1RECEIVER CIRCUITS 4-1-1DUPLEXER CIRCUIT (1F UNIT) The transceiver has a duplexer (low-pass and high-pass fil- ters) on the first stage from the antenna connector to sepa- rate the signals into VHF and UHF signals. The low-pass fil- ter (L10–L12, C16–C22) for VHF signals and high-pass filter (L1–L3, C1–C5) for UHF signals. The separated signals are applied to each RF circuit. 4-1-2VHF ANTENNA SWITCHING CIRCUIT (1F UNIT) The antenna switching circuit functions as a low-pass filter while receiving. However, Its impedance becomes very high while transmitting by applying a current to D51 and D52. Thus, transmit signals are blocked from entering the receiv- er circuits. The antenna switching circuit employs a 1/4 λ type diode switching system. The passed signals are then applied to the RF amplifier circuit on the 2F unit. 4-1-3VHF RF CIRCUIT (2F UNIT) The RF circuit amplifies signals within the range of frequen- cy coverage and filters out-of-band signals. The signals from the antenna switching circuit are applied to the limitter (D55), and are then passed through the band- pass filter (D52, L53). The filtered signal is applied to the RF amplifiers (Q51, Q52). The amplifier consists of a cascade circuit. The amplified signals are passed through the next stage band-pass filter (D53, D54, L54, L55) to suppress unwanted signals. The filtered signals are then applied to the mixer circuit (Q401). D53 and D54 track the band-pass filters and are controlled by the PLL lock voltage. These diodes tune the center fre- quency to obtain good image response rejection. 4-1-4UHF RF CIRCUIT (2F UNIT) The signals from the antenna switching circuit (1F unit; D551, D552, D722–D724 and Q204) are applied to the limit- ter (D201), and are then amplified at the the RF amplifier (Q201). The amplified signals are passed through the band- pass filter (FI201), and are then applied to another RF ampli- fier (Q202). The amplified signals are applied to the 1st mixer circuit (Q401). Common circuits with VHF band are used later stage from the 1st mixer. 4-1-51ST MIXER AND 1ST IF CIRCUITS (2F UNIT) The mixer circuit converts the received signal to a fixed fre- quency of the 1st IF signal with a 1st LO (VCO output) fre- quency. By changing the PLL frequency, only the desired frequency will be passed through a crystal filter at the next stage of the mixer. The received signals from the VHF or UHF RF circuit are mixed with the 1st LO signal (VCO output signal) at the 1st mixer (Q401) to produce a 45.15 MHz 1st IF signal. The 1st IF signal is applied to a crystal filter (FI401) to sup- press out-of-band signals. The filtered 1st IF signal is ampli- fied at the IF amplifier (Q101) and is then applied to the 2nd mixer circuit (IC101, pin 16). 4-1-62ND IF AND DEMODULATOR CIRCUITS (2F UNIT) The 2nd mixer circuit converts the 1st IF signal to a 2nd IF signal. A double superheterodyne system (which converts receive signals twice) improves the image rejection ratio and obtains stable receiver gain. The FM IF IC (IC101) contains the 2nd mixer, 2nd local oscillator, limiter amplifier, S-meter detector and quadrature detector circuits. • 2nd IF AND DEMODULATOR CIRCUITS Mixer 16 Limiter amp. 2nd IF filter 450 kHz PLL IC IC851 X1 15.2 MHz RSSI IC2 TA31136FN 13 2nd IF (45.15 MHz) from Q101 (1F unit) "SD" signal to the CPU pin 3 (Logic unit: IC1) 11 10 9 87 53 2 17 16 Active filter FI101 Noise detector FM detector Noise comp. "NOISE" signal to the CPU pin 12 (Logic unit: IC1) 12 C107 C115 R112 C501 C112 C111 C113 R104 L21 AF signal "DETO" to the LOGIC unit 3 Q356 2nd local oscillator C116 R113 R106 L102 R111 R112 "LO" signal from Q852 on the LOGIC unit 1F unit 2F unit 4 - 2 The 1st IF signal (45.15 MHz) from the IF amplifier (Q101) is applied to the 2nd mixer section of IC101 (pin 16), and is mixed with the 2nd LO signal (45.6 MHZ) for conversion to a 450 kHz 2nd IF signal at the 2nd mixer section. The 2nd IF signal (450 kHz) from the 2nd mixer section (IC101, pin 3) passes through the ceramic filter (FI101) where unwanted signals are suppressed. It is then amplified at the limiter amplifier section (IC101, pin 5) and applied to the quadrature detector section to demodulate the 2nd IF signal into AF signals. AF signals output from IC101 (pin 9) are applied to the AF drive amplifier (Q12) on the LOGIC unit. The S-meter out- put “SD” signal from IC101 (pin 12) is applied to the CPU (LOGIC unit; IC1, pin 3). 4-1-7AF AMPLIFIER CIRCUIT (LOGIC UNIT) The AF amplifier circuit, including an AF mute switch, ampli- fies the demodulated signals to drive a speaker. The demodulated AF signals (“DETO” signals) from the FM IF IC (IC101) on the 2F unit are applied to the drive amplifi- er (Q12, pin 3) via the band-pass filter (C44, C45). The band-pass filter suppresses subaudible tones and higher noise signal components. The amplified signals from Q12 (pin 1) pass through the AF mute switch (Q10) and are then applied to the AF volume control on the 1F unit via the “AF” signal line. 4-1-8AF POWER AMPLIFIER CIRCUIT (2F UNIT) The AF signals from the AF volume control (“AFV” signals) are amplified at the AF power amplifier IC (IC151, pin4). The amplified AF signals are applied to the loud speaker via the external speaker jack (1F unit; J902). 4-1-9NOISE SQUELCH UNIT (2F UNIT) A noise squelch circuit cuts out AF signals when no RF sig- nal is received. By detecting noise components in the AF signals, the squelch circuit switches the AF mute switch. Some of the noise components in the AF signals from the FM IF IC (IC101, pin 9) are applied to the active filter section (IC101, pins 7 and 8). The variable register (R504) adjusts the active filter input level. The active filter section amplifies noise components with fre- quencies of 20 kHz and above. The filtered signals are rec- tified at the noise detector section and converted into “NOlSE” (pulse type) signals at the noise comparator sec- tion. The “NOISE” signal is applied to …

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S.=Surface mount IC2501110002700 S.ICNJM2904M-T1 IC8511130007610 S.ICμPD3140GS-E1 (DS8) Q2011530000371 S.TRANSISTOR2SC3356 R25-T2B Q2021510000670 S.TRANSISTOR2SA1588-GR (TE85R) Q2031590001140 S.TRANSISTORUN9210 (TX) Q2041590002730 S.TRANSISTORUN921L (TX) Q2501530002280 S.TRANSISTOR2SC4081 T107 S Q2531590001050 S.TRANSISTORDTC114TUA T106 Q2551520000430 S.TRANSISTOR2SB1462-R (TX) Q3511530003310 S.TRANSISTOR2SC5107-O (TE85R) Q3521530003310 S.TRANSISTOR2SC5107-O (TE85R) Q3531590001690 S.TRANSISTORUN9115 (TX) Q3541590001140 S.TRANSISTORUN9210 (TX) Q3551560000540 S.FET2SK880-Y (TE85R) Q3561530002280 S.TRANSISTOR2SC4081 T107 S Q3571590001690 S.TRANSISTORUN9115 (TX) Q7011530000371 S.TRANSISTOR2SC3356 R25-T2B Q7021520000460 S.TRANSISTOR2SB1132 T100 R Q7031540000350 S.TRANSISTOR2SD2216-S (TX) Q7041590001150 S.TRANSISTORUN9211 (TX) Q7051510000670 S.TRANSISTOR2SA1588-GR (TE85R) Q8521530002560 S.TRANSISTOR2SC4403-3-TL Q8531590001690 S.TRANSISTORUN9115 (TX) Q8541590001140 S.TRANSISTORUN9210 (TX) D11790001260 S.DIODEMA2S077-(TX) D21790001260 S.DIODEMA2S077-(TX) D511790001260 S.DIODEMA2S077-(TX) D521790001260 S.DIODEMA2S077-(TX) D2011790001260 S.DIODEMA2S077-(TX) D2021790001260 S.DIODEMA2S077-(TX) D2501730002260 S.ZENERMA8030-H (TX) D2511790001010 S.ZENERMA8043-L (TX) D3511790001260 S.DIODEMA2S077-(TX) D3521790001260 S.DIODEMA2S077-(TX) D3531790001260 S.DIODEMA2S077-(TX) D3541790000840 S.DIODEMA132WA (TX) D5511790001260 S.DIODEMA2S077-(TX) D5521790001260 S.DIODEMA2S077-(TX) D7011790001260 S.DIODEMA2S077-(TX) D7021790000860 S.DIODEMA133 (TX) D7031790001250 S.DIODEMA2S111-(TX) D7221750000530 S.DIODE1SV271 (TPH3) D7231790001260 S.DIODEMA2S077 D7241790001260 S.DIODEMA2S077 D7251750000530 S.DIODE1SV271 (TPH3) D9011750000540 S.DIODERB060L-40 TE-25 X8516050009430 XTALCR-515 (15.200000 MHz) L16200007790 S.COILLQN21A R15J04 L26200008250 S.COIL0.30-0.9-7TL 21N L36200008760 S.COIL0.26-0.9-9TR 30N L56200004350 S.COILLL1608-F10NK L66200004350 S.COILLL1608-F10NK L76200008240 S.COIL0.30-0.9-5TL 14N L86200008850 S.COIL0.40-1.1-6TR L96200008770 S.COIL0.28-1.0-5TR 16N L106200005890 S.COILNLH252018T-039J 39N L116200008830 S.COIL0.20-1.0-12TL 60N L126200005900 S.COILNLH252018T-047J 47N L136200004480 S.COILMLF1608D R82K-T L516200005910 S.COILNLH252018T-056J 56N L526200005910 S.COILNLH252018T-056J 56N L2016200004480 S.COILMLF1608D R82K-T L2026200005930 S.COILNLH252018T-082J 82N L2036200003590 S.COILEXCCL3225U1 L2046200003590 S.COILEXCCL3225U1 L2056200004480 S.COILMLF1608D R82K-T L2066200005690 S.COILELJRE 18NG-F L3526200003550 S.COILMLF1608A 4R7K-T L3536200003550 S.COILMLF1608A 4R7K-T L3546200004480 S.COILMLF1608D R82K-T L3556200004480 S.COILMLF1608D R82K-T L5516200008530 S.COIL0.30-1.0-4TR 12N L5526200008530 S.COIL0.30-1.0-4TR 12N L7016200004370 S.COILLL1608-F15NK L7026200005830 S.COILNLH252018T-012J 12N L7036200004380 S.COILLL1608-F18NK L7236200008080 S.COILLQN21A R22J04 L7246200008080 S.COILLQN21A R22J04 L7256200008080 S.COILLQN21A R22J04 L8016200006980 S.COILELJRE R10G-F L9006200003590 S.COILEXCCL3225U1 L9016200003590 S.COILEXCCL3225U1 R17030007270 S.RESISTORERJ2GEJ 151 X (150 Ω) R2017030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R2027030007270 S.RESISTORERJ2GEJ 151 X (150 Ω) R2037030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R2047030005530 S.RESISTORERJ2GEJ 100 X (10 Ω) R2057030007340 S.RESISTORERJ2GEJ 153 X (15 kΩ) R2077030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R2087030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R2097030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R2107030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R2507030007330 S.RESISTORERJ1WRSJR15U (0.15 Ω) R2517030005070 S.RESISTORERJ2GEJ 683 X (68 kΩ) R2527030005240 S.RESISTORERJ2GEJ 473 X (47 kΩ) R2587030007340 S.RESISTORERJ2GEJ 153 X (15 kΩ) R2597030005050 S.RESISTORERJ2GEJ 103 X (10 kΩ) R2607030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R2617030005160 S.RESISTORERJ2GEJ 105 X (1 MΩ) R2627030005220 S.RESISTORERJ2GEJ 223 X (22 kΩ) R2637030005050 S.RESISTORERJ2GEJ 103 X (10 kΩ) R2647030007290 S.RESISTORERJ2GEJ 222 X (2.2 kΩ) R2657030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R2667510001000 S.THERMISTORTBPS1R154K475H5Q R2677030007340 S.RESISTORERJ2GEJ 153 X (15 kΩ) R2787030005530 S.RESISTORERJ2GEJ 100 X (10 Ω) R2817030005120 S.RESISTORERJ2GEJ 102 X (1 kΩ) R2827030005090 S.RESISTORERJ2GEJ 104 X (100 kΩ) R2837030005090 S.RESISTORERJ2GEJ 104 X (100 kΩ) R2847030007260 S.RESISTORERJ2GEJ 330 X (33 Ω) R2857030005120 S.RESISTORERJ2GEJ 102 X (1 kΩ) R3507030005120 S.RESISTORERJ2GEJ 102 X (1 kΩ) R3517030009200 S.RESISTORERJ2GEJ 390 X (39 Ω) R3527030005030 S.RESISTORERJ2GEJ 152 X (1.5 kΩ) R3547030005220 S.RESISTORERJ2GEJ 223 X (22 kΩ) R3557030007260 S.RESISTORERJ2GEJ 330 X (33 Ω) R3567030005300 S.RESISTORERJ2GEJ 150 X (15 Ω) R3577030005300 S.RESISTORERJ2GEJ 150 X (15 Ω) R3587030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R3597030005240 S.RESISTORERJ2GEJ 473 X (47 kΩ) R3607030004990 S.RESISTORERJ2GEJ 221 X (220 Ω) R3617030004970 S.RESISTORERJ2GEJ 470 X (47 Ω) R3627030005100 S.RESISTORERJ2GEJ 154 X (150 kΩ) R3637030005110 S.RESISTORERJ2GEJ 224 X (220 kΩ) R3647030005110 S.RESISTORERJ2GEJ 224 X (220 kΩ) R3657030007280 S.RESISTORERJ2GEJ 331 X (330 Ω) R3667030005050 S.RESISTORERJ2GEJ 103 X (10 kΩ) R3677030005030 S.RESISTORERJ2GEJ 152 X (1.5 kΩ) R3687030005010 S.RESISTORERJ2GEJ 681 X (680 Ω) R3697030005090 S.RESISTORERJ2GEJ 104 X (100 kΩ) R3707030005050 S.RESISTORERJ2GEJ 103 X (10 kΩ) R3717030007280 S.RESISTORERJ2GEJ 331 X (330 Ω) R3727030005090 S.RESISTORERJ2GEJ 104 X (100 kΩ) R3737030005240 S.RESISTORERJ2GEJ 473 X (47 kΩ) R3747030005090 S.RESISTORERJ2GEJ 104 X (100 kΩ) R7017030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R7027030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R7047030005530 S.RESISTORERJ2GEJ 100 X (10 Ω) R7057030005050 S.RESISTORERJ2GEJ 103 X (10 kΩ) R7067030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) 6 - 1 REFORDER DESCRIPTION NO.NO. [1F UNIT] REFORDER DESCRIPTION NO.NO. [1F UNIT] SECTION 6 PARTS LIST S.=Surface mount R7087030004980 S.RESISTORERJ2GEJ 101 X (100 Ω) R7097030005040 S.RESISTORERJ2GEJ 472 X (4.7 kΩ) R7…

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SECTION 4CIRCUIT DESCRIPTION 4 - 1 4-1RECEIVER CIRCUITS 4-1-1DUPLEXER CIRCUIT (1F UNIT) The transceiver has a duplexer (low-pass and high-pass fil- ters) on the first stage from the antenna connector to sepa- rate the signals into VHF and UHF signals. The low-pass fil- ter (L10–L12, C16–C22) for VHF signals and high-pass filter (L1–L3, C1–C5) for UHF signals. The separated signals are applied to each RF circuit. 4-1-2VHF ANTENNA SWITCHING CIRCUIT (1F UNIT) The antenna switching circuit functions as a low-pass filter while receiving. However, Its impedance becomes very high while transmitting by applying a current to D51 and D52. Thus, transmit signals are blocked from entering the receiv- er circuits. The antenna switching circuit employs a 1/4 λ type diode switching system. The passed signals are then applied to the RF amplifier circuit on the 2F unit. 4-1-3VHF RF CIRCUIT (2F UNIT) The RF circuit amplifies signals within the range of frequen- cy coverage and filters out-of-band signals. The signals from the antenna switching circuit are applied to the limitter (D55), and are then passed through the band- pass filter (D52, L53). The filtered signal is applied to the RF amplifiers (Q51, Q52). The amplifier consists of a cascade circuit. The amplified signals are passed through the next stage band-pass filter (D53, D54, L54, L55) to suppress unwanted signals. The filtered signals are then applied to the mixer circuit (Q401). D53 and D54 track the band-pass…

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