Icom IC-T90A manual Specifications, General, Transmitter

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SECTION 1 SPECIFICATIONS

MGENERAL

• Frequency range		:							(Unit: MHz)

	Version		50 MHz	145 MHz	440 MHz			Receiving

	USA			144 – 148	430 – 450*2
	CAN		50 – 53.995	144 – 148	430 – 450*2		0.495–999.990*4
	CAN
	GEN			136 – 174*1	400 – 470*3
	GEN			136 – 174*1	400 – 470*3

	SEA			140 – 150*1	430	– 440

		*1Specifications guaranteed 144 – 148 MHz
		*2Specifications guaranteed 440 – 450 MHz
		*3Specifications guaranteed 430 – 440 MHz
		*4Except 824 – 849 MHz, 869 – 894 MHz				[USA] only
• Mode			: FM, AM (RX only) and WFM (Rx only)
• Number of memory channels			: 555 (incl. 50 scan edges and 5 call channels)
• Frequency stability			: ±6 ppm max. (–10˚C to +60˚C; 14˚F to 140˚F)
• Tuning steps			: 5, 6.25, 8.33, 9, 10, 12.5, 15, 20, 25, 30, 50 100, and 200 kHz
• Usable tempareture range			: –10˚C to +60˚C; 14˚F to 140˚F
• Power supply requirement			: 5.5 – 11 V DC or specified battery pack
• Usable battery pack/case			: BP-217 (7.4 V) and BP-216 (3.2 V)
• Polarity			: Negative ground
• Current drain (at 8.0 V DC)		: (typical value)

			50/145 MHz	440 MHz
	TX	High power	2.0 A	2.0 A
	TX	Low power	0.8 A	1.2 A
		Low power	0.8 A	1.2 A
		Rated output	220 mA
	RX	Standby	100 mA
		Power saved*1	65 mA

*1Power save duty is 1:4.

• Anntena connector

: SMA (50 Ω )

• Dimensions (projections not included) : 58(W) ⋅ 87(H) ⋅ 29(D) mm; 217⁄32(W) ⋅ 37⁄16(H) ⋅ 15⁄32(D) in

• Weight (with BP-217/Ant.)

: 280 g; 97⁄8 oz

MTRANSMITTER

• Output power (at 8.0 V DC)	: High	5.0 W typical
	Low	0.5 W typical
• Modulation system	: Variable reactance modulation
• Max. freq. deviation	: ±5 kHz
• Spurious Emissions	: Less than –60 dB
• External MIC connector	: 3-conductor 2.5(d) mm (1⁄8”); 2 kΩ

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Contents IC-t90a Introduction Ordering PartsRepair Notes Sample OrderTable of Contents General SpecificationsTransmitter Receiver Frequency MHzWFM WFMInside Views Logic UnitTop view Bottom viewRF Unit AF UnitTop view Bottom view Disassembly Instructions Removing the rear panel Removing the AF unitCircuit Description Receiver Circuits5 2ND if and Demodulator Circuits AF Unit 4 1ST Mixer and 1ST if Circuits RF, AF and VCO UnitsRF Circuit Squelch Circuitaf and Logic Units AF Amplifier Circuit AF Unit2ND if and Demodulator Circuit Transmitter Circuits PLL Circuits APC Circuit RF UnitGeneral APC CircuitVCO Divider Circuit VCO and RF Units PLL CircuitPower Supply Circuits 2 R3V Switch IC AF Unit IC51Port Allocations Voltage LineCPU Logic Unit IC1 Ctsel DtcsLCD SEG35Adjustment Procedures Operation on the Adjustment ModeOperation on the Output Power Adjustment PreparationJIG ConnectionAD-92SMA Trimmer Adjustment PLL LockVCO VoltageVCO Unit RF UnitL16 L456 L19Adjustment Mode Adjustments ReferenceDial FrequencyAdjustment Mode Adjustments PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency Connect an amme 45 a Logic Unit R325R365 R326Ctcss Coil DetectorTracking AF Unit CP0IC151, pin 12 SD line L151Displayed frequency Connect a DC volt Maximum voltage Adjustment Adjustment Condition Operation MeterSection Parts List Order DescriptionCoil Eljre 3N9Z-F Ceramic ECJ0EB1H681K Connector AXK6S30445P Ceramic ECJ0EC1H060C Encoder Trimmer Tantalum ECST1EY474R Ceramic ECJ0EC1H2R5B Accessories Mechanical Parts and DisassemblyChassis Parts Logic Unit RF UnitChassis Parts AF Unit VCO UnitSEMI-CONDUCTOR Information Transistors and FetsDiodes NameBoard Layouts TOP ViewMC1 Microphone DUPLogic unit Bottom ViewSP1 SQL PTTRF Unit RF unit VCO Unit AF UnitEXT.SP EXT.MICREMOTO S253S252 Block Diagram Logic UnitChassis Loop LPF HPF Drive BPF ANT FIL AMPVoltage Diagram 11 1 Logic UnitIC5 11 2 RF Unit 2SK347611 3 AF Unit BU4094BCFVURL 32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan