SB-009

TS-820 Speech Processor Alignment                            11-17-76


The following alignment procedure may be used in lieu of the one in the 
Service Manual.

Test Equipment required:
        Audio Signal Generator
        Audio VTVM
        Oscilloscope or RF VTVM

1.      Preliminary control settings:
        Screen grid switch off.
        Mode switch to USB.
        Comp Level to USB.
        Processor SW to Pull "ON".
        Meter switch ot "Comp".

        Send/Rec switch to "Send" as required when making adjustments.

2.      Apply 1500 Hz audio signal to the mic jack at 10mv level.
        Connect RF VTVM or scope to TP-2.
        Adjust T-11, 12, 13, for maximum level on the S-meter.
        Adjust T-14 for maximum level on scope or VTVM at TP-2.

3.      Turn compression level to min, (CCW).
        Reduce audio sig at mic jack to 0.3 mv.
        Adjust TC-4 (Freq response for speech processor) so that level at
                TP-2 is not changed when changing audio gen from 400 Hz to
                2000Hz.

4.      Turn compression level to max, (CW)
        Set audio gen to 1500Hz at 0.3 mv.
        Adjust TC-3 and VR-6 (carrier bal for speech proc) for maximum level
                at TP-2.

5.      Set audio gen to 10 mv at 1500Hz
        Send/Rec switch to send
        Adjust VR-7 (comp level for speech processor) so that the level at 
                TP-2 is not changed when turning the processor on and off.  VR-7
                should be adjusted for the particular microphone the customer 
                will be using with his TS-820.

6.      Finally check for non distortion of signal, and that comp level of 
                20db can be obtained at full comp on.


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