RF unit | Icom IC-T90A specification

RF unit

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The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board.

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Image 47

Icom IC-T90A manual RF unit

Contents

IC-t90a Sample Order IntroductionOrdering Parts Repair Notes Table of Contents Transmitter SpecificationsGeneral WFM ReceiverFrequency MHz WFM Bottom view Inside ViewsLogic Unit Top view Top view Bottom view AF UnitRF Unit Removing the rear panel Removing the AF unit Disassembly Instructions Receiver Circuits Circuit Description RF Circuit 4 1ST Mixer and 1ST if Circuits RF, AF and VCO Units5 2ND if and Demodulator Circuits AF Unit 2ND if and Demodulator Circuit AF Amplifier Circuit AF UnitSquelch Circuitaf and Logic Units Transmitter Circuits APC Circuit PLL CircuitsAPC Circuit RF Unit General PLL Circuit VCO Divider Circuit VCO and RF Units Voltage Line Power Supply Circuits2 R3V Switch IC AF Unit IC51 Port Allocations CPU Logic Unit IC1 SEG35 CtselDtcs LCD Preparation Adjustment ProceduresOperation on the Adjustment Mode Operation on the Output Power Adjustment AD-92SMA ConnectionJIG Voltage Trimmer AdjustmentPLL Lock VCO L19 VCO UnitRF Unit L16 L456 Frequency Adjustment Mode AdjustmentsReference Dial Adjustment Mode Adjustments PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency Connect an amme 45 a R326 Logic UnitR325 R365 Ctcss Tracking DetectorCoil L151 AF UnitCP0 IC151, pin 12 SD line Displayed frequency Connect a DC volt Maximum voltage Meter Adjustment Adjustment Condition Operation Order Description Section Parts List Coil Eljre 3N9Z-F Ceramic ECJ0EB1H681K Connector AXK6S30445P Ceramic ECJ0EC1H060C Encoder Trimmer Tantalum ECST1EY474R Ceramic ECJ0EC1H2R5B Chassis Parts Mechanical Parts and DisassemblyAccessories AF Unit VCO Unit Logic UnitRF Unit Chassis Parts Name SEMI-CONDUCTOR InformationTransistors and Fets Diodes DUP Board LayoutsTOP View MC1 Microphone SQL PTT Logic unitBottom View SP1 RF Unit RF unit EXT.SP EXT.MICREMOTO AF UnitVCO Unit S253S252 Logic Unit Block Diagram Loop LPF HPF Drive BPF ANT FIL AMP Chassis 11 1 Logic Unit Voltage Diagram IC5 2SK3476 11 2 RF Unit BU4094BCFV 11 3 AF Unit URL 32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan