====== Orion II Schematic Index ======

[[https://tentecwiki.eqth.net/webarchive/566/schematics/Orion_II_Sch.zip|Click Here to Download All Schematics]] or Click each individual schematic below.
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  *A0 - Input / Output
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81908_1.PDF|81908_1.PDF]] - 1 / 5  vfoA
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81908_2.PDF|81908_2.PDF]] - 2 / 5  band data
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81908_3.PDF|81908_3.PDF]] - 3 / 5  antenna relays
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81908_4.PDF|81908_4.PDF]] - 4 / 5  vfoB
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81908_5.PDF|81908_5.PDF]] - 5 / 5  rear panel RCA and DC

  *A1 - Lowpass Filter - T/R relay
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81909.PDF|81909.PDF]]

  *A2 - PA
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/566PA.PDF|566PA.PDF]]

  *A3 - RF Converter
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/A3_Layout1_(1).PDF|A3_Layout1_(1).PDF]] - 1 / 3 
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/PRE_Model_(1).PDF|PRE_Model_(1).PDF]] - 2 / 3 Preselector
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/MX_Model_(1).PDF|MX_Model_(1).PDF]] - 3 / 3 Trans / Receive

  *A4 - 9 Mhz IF
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/1stIF.PDF|1stIF.PDF]]

  *A5
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/IF_CONVERTER.PDF|IF_CONVERTER.PDF]] - 1 / 6 IF Converter
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/AGC.PDF|AGC.PDF]] - 2 / 6 AGC Detector
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/ALC.PDF|ALC.PDF]] - 3 / 6 ALC Circuitry
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/2ndLO.PDF|2ndLO.PDF]] - 4 / 6 2nd LO
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/TX.PDF|TX.PDF]] - 5 / 6 Transmit Chain
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/IFCV.PDF|IFCV.PDF]] - 6 / 6 IFC V1

  *A6
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81907_1.PDF|81907_1.PDF]] - 1 / 4 Sub Receiver
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81907_2.PDF|81907_2.PDF]] - 2 / 4 PLL
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81907_3.PDF|81907_3.PDF]] - 3 / 4 Preselector
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81907_4.PDF|81907_4.PDF]] - 4 / 4 Receiver

  *A7 - CPU / DSP Logic
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/MAIN.PDF|MAIN.PDF]]  -  1 / 11 Main CPU
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/TR.PDF|TR.PDF]]  -  2 / 11 T/R Drivers
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/RS232.PDF|RS232.PDF]]  -  3 / 11 RS-232
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/SPR.PDF|SPR.PDF]]  -  4 / 11 Spare to CPU Interface
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/PTT.PDF|PTT.PDF]]  -  5 / 11 PTT Driver
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/AMP.PDF|AMP.PDF]]  -  6 / 11 Amplifier Loop
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/POWER.PDF|POWER.PDF]]  -  7 / 11 Power
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/MEMORY.PDF|MEMORY.PDF]]  -  8 / 11 Memory
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/LCD.PDF|LCD.PDF]]  -  9 / 11 LCD
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/SHARC.PDF|SHARC.PDF]] - 10 / 11 Sharc DSP
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/ADC.PDF|ADC.PDF]] - 11 / 11 Analog to Digital

  *A8 - Keypad
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/566KEYPAD.PDF|566KEYPAD.PDF]]  Front panel switches, encoders, LEDs, mic jack

  *A9 - Power Dist Board
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81936.PDF|81936.PDF]]

  *A10 - Synthesizer
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/565synC.PDF|565synC.PDF]]

  *A11 - Motherboard
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81916.PDF|81916.PDF]]

  *A12 - Rear Connector Board
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/CONNECTOR.PDF|CONNECTOR.PDF]]

  *A13 - Sweep Amp
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/81957.PDF|81957.PDF]]

  *A15 - Audio
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/566AUDIO_Model_(1).PDF|566AUDIO_Model_(1).PDF]] SSM2166 Mic preamp, Main/sub rx CODEC and amps

  *Autotuner
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/78277E_Model_(1).PDF|78277E_Model_(1).PDF]] 1 / 4
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/DETECTOR_Model_(1).PDF|DETECTOR_Model_(1).PDF]] 2 / 4
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/CPU_Model_(1).PDF|CPU_Model_(1).PDF]] 3 / 4
    *[[https://tentecwiki.eqth.net/webarchive/566/schematics/RF_Model_(1).PDF|RF_Model_(1).PDF]] 4 / 4