Stewart and Don and anyone else -
I've gotten back to trying to fix my VOX. It seems that with any microphone the
VOX wants to key the radio until shut off. Sometimes right away, sometimes
after a bit. Disconnecting the microphone doesn't help. PTT works fine.
I have followed Don's advice and reseated the firmware chip - no joy.
I followed Stewart's advice and measured the voltage between pins 2 and 3 on U4.
He suggested:
SSBA =1 =76mV
SSBA =2 =74mV
SSBA =3 =50mV
I got 3.1v at all settings.
I then checked the voltages on all pin U4 pins according to the manual. All are
close with one minor and one major exception.
Minor - pin 6 reads 5.7v instead of manual listed 5.1v.
Major - pin 3 reads 5.97v instead of manual listed .6v.
And, once the PTT is pressed and released, pin 3 reads 3.1v regardless of SSBA
or SSBC setting. It then remains at 3.1v
Where to next, oh Gurus?
73 de NA8M
John
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