I think if you look at the Model 563 Wiring Diagram, microphone jack, you will
see that the GND is, indeed, indicated as being connected directly to chassis.
This was just confirmed on my radio with a voltage check (no difference) and
with a resistance check (dead short) just a moment ago.
73,
dale, kg5u
>Al, a lot of rigs - like my Icom IC-765 - do not use the same "ground"
>for chassis and PTT, for example, and for the audio input. Icom "floats"
>their mic input ground all the way up to the input of the first active
>stage in the mic channel. So, the audio ground line at the connector does
>not show zero ohms to chassis ground.
>
>Don't know about Tentec but they might do something similar which would
>account for your finding.
>
>72/73, George
>Al Williams wrote:
>>
>> I am happy to see the information on where the info about the mike voltage
>> is located as I looked for it in isolating a failure in my 14 mos old
>> omni6+. (on my first call in fone SS contest, there was no indication of
>> output). I have since determined that it works if I jumper
>> the hand held tt mikes ground to chassis ground. The gnd pin on the
>> tt front panel has no continuity to chassis ground. I haven't yet asked
>> tt for the proper repair. Noticed that there appear to be some ferrite
>> cylinders on some to leads from the tt front panel mike connector.
>>
>> I have started a cross-reference list for the omni6+ to help in tracing
>> circuits from one board to another. I wonder if others have already
>> done this (besides TenTec!) or are interested. Or am I missing some
>> means already in place?
>> alwilliams@olywa.net k7puc
>
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