Motorola IC-T81A, IC-T81E Specifications, General, Transmitter, 50/144 MHz 440 MHz 1200 MHz

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SECTION 1 SPECIFICATIONS

MGENERAL

• Frequency range		:

	Version	50 MHz	145 MHz	440 MHz	1200 MHz	91.5 MHz (RX only)
	U.S.A.	50 – 53.995	TX: 144 – 148	TX: 430 – 450*3	1240 – 1300	76 – 107.995*4
	U.S.A.	50 – 53.995	RX: 118 – 173.995*1	RX: 400 – 469.995*3	1240 – 1300	76 – 107.995*4
			RX: 118 – 173.995*1	RX: 400 – 469.995*3

	Australia	50 – 53.995	144 – 148	430 – 440	1240 – 1300	88 – 107.995*4

	S.E.Asia	50 – 53.995	TX: 136 – 173.995*1	400 – 469.995*2	1240 – 1300	76 – 107.995*4
	S.E.Asia	50 – 53.995	RX: 118 – 173.995*1	400 – 469.995*2	1240 – 1300	76 – 107.995*4
			RX: 118 – 173.995*1
	Europe, U.K.	50 – 52	144 – 146	430 – 440	1240 – 1300	88 – 107.995*4
	Italy	50 – 52	TX: 136 – 173.995*1	400 – 469.995*2	1240 – 1300	88 – 107.995*4
	Italy	50 – 52	RX: 118 – 173.995*1	400 – 469.995*2	1240 – 1300	88 – 107.995*4
			RX: 118 – 173.995*1

	1 Specifications guaranteed 144 – 148 MHz, 2 Specifications guaranteed 430 – 440 MHz
	3 Specifications guaranteed 440 – 450 MHz, 4 Not guaranteed
• Mode		: FM and AM (RX only), WFM (Rx only)
• No. of memory channels		: 124 (incl. 10 pairs of scan edges and 4 call channels)
• Frequency stability		: ±3 ppm max. (–10˚C to +60˚C; 14˚F to 140˚F)
• Tuning steps		: 5, 10, 12.5, 15, 20, 25, 30, 50 and 100 kHz
		*Not available for 1200 MHz band
• Usable tempareture range		: –10˚C to +60˚C; 14˚F to 140˚F
• Usable battery pack/case		: BP-198, BP-199, BP-200 and BP-197
• Power supply requirement		: 4.5 – 16 V DC or specified battery pack
• Polarity		: Negative ground
• Frequency resplution		: 5 kHz and 12.5 kHz (10 kHz and 12.5 kHz for 1200 MHz band)
• Current drain (at 13.5 V DC)		: (typical value)

			50/144 MHz	440 MHz	1200 MHz
	TX	High power	1.4 A	1.3 A	0.8 A
	TX	Low power	0.6 A	0.5 A	0.4 A
		Low power	0.6 A	0.5 A	0.4 A
		Rated output		220 mA
	RX	Standby		80 mA (at 9.6 V)
		Power saved		40 mA (at 9.6 V)
• Anntena connector	: SMA (50 Ω )
• Dimensions (projections not included) : 58(W) ⋅ 106(H) ⋅ 28.5(D) mm; 25⁄16(W) ⋅ 43⁄16(H) ⋅ 11⁄8(D) in
• Weight (with BP-197/Ant.)	: 290 g; 10.2 oz

MTRANSMITTER

• Output power (at 13.5 V DC)	: High	5.0 W typical (1.0 W at 1200 MHz band)
	Low	1.0 W typical (0.1 W at 1200 MHz band)
• Modulation system	: Variable reactance modulation
• Max. freq. deviation	: ±5 kHz
• Spurious Emissions	: Less than –60 dB (50 MHz, 144 MHz and 440 MHz)
	Less than –40 dB (other)
	Less than –50 dB (Europe version at 1200 MHz)
• External MIC connector	: 3-conductor 2.5(d) mm (1⁄8”); 2 kΩ

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Contents Multiband FM Transceiver Introduction Ordering PartsRepair Notes Sample OrderTable of Contents Specifications GeneralTransmitter Version 50 MHz 145 MHz 440 MHz 1200 MHz MHz RX onlyReceiver BandWFM WFMInside Views Logic UnitRF Unit CPUDisassembly Instructions Removing the Chassis Panel Removing the Shield PlateRemoving the Logic Unit Removing the RF Unit Logic unitAntenna Switching Circuits RF Unit Circuit DescriptionReceiver Circuits Duplexer Circuit RF Unit7 1ST Mixer Circuit RF Unit Transmitter Circuits DRIVE/POWER Amplifier Circuits RF Unit APC Circuits RF UnitMHz PA APC Control CircuitPower Supply Circuits Voltage Line PLL CircuitsLine Description VCCPort Allocations 1 I/O Expander IC RF Unit IC22 I/O Expander IC RF Unit IC3 Pin Port Description Number NameCPU Logic Unit IC1 Adjustment Procedures Preparation‘ Required Test Equipment ConnectionPLL Adjustment RF Unit Bottom View ULVVLV RF Unit TOP View 6MLVReceiver Adjustment DialSensitivity VHFLogic Unit TOP View Meter SSGTop Push and hold MHz band 101 dBmDisplayed frequency Push and hold445.000 MHz USA-1 SQL keyTransmitter Adjustment Deviation HPF OFF LPFDtmf AUS, SEAParts List =Surface mountTrimmer Ceramic ECUE1H121JCQ Transistor UN911D TX Coil Eljnd R10J 0.1U Themistor Ceramic ECUE1H060CCQ Ceramic ECUE1H390JCQ VCO Board Ceramic ECUE1H120JCQ Mechanical Parts and Disassembly AccessoriesChassis Parts VCO UnitMP29 C Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Logic Unit Board LayoutsTOP View Bottom View IC1IC3 GND Pset IfinRF Unit IC6L912 J4 to Logic unit J1IC3 MP1IC2 VCO Board J302 to RF unitOUT 12VCOOUT VLVCO3 VHF GND VHVCO3 UVCO3 Uhfout GND 12VCO3 GNDQ354 Block Diagram Mode Xtal BPF PDA2, CK AMP TX/RX FrequencyTX/RX Buff ANT LPF HPF AMPReset Mode Xtal Initial BPFMOD TX/RX Frequency ANT Buff HPF LPF YGRSection Voltage Diagram Logic Unit2NDLO Oscin Mixin Oscout GND Mixout REC VCC DET Ifin RssiDEC Ifout Filout Quad WFM NTCCF20124AH 473KCT TXC12VCO COM2 Reset COM3 COM2 Reset PowerClonein VCC VIN Cpuhv COM4 COM3 COM2 COM1RF Unit VHF400M 1200M50M 00M1200MHz 400MHzGND1 PLST1 IN1ENB VCC2 LOK GND2Icom America Inc 5566I-S Icom Inc