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 Post subject: FT-101ZD Mic Audo
PostPosted: May Thu 02, 2019 12:45 pm 

Joined: Jan Mon 30, 2017 1:09 am
Posts: 102
Location: Port Hope, Ontario, Canada, L1A 1W8
Any one run in to this. Mic Audio on SSB is up one day, down the next.
Here is what my friend say about the problem.

The problem with the FT-101 is intermittent low to no output on SSB.

The first time I tried to get on air nobody could hear me (local 10m net.) I set up a test session with a local ham and with my mic gain all the way up and speaking loudly, his signalreports ranged were nothing received to low audio, with one brief period of a normal signal.

Following the procedure for

During the low output times I get little to no deflection on the alc meter, and my power meter shows minimal output.

I wanted to swap the mic to rule it out, but I wasn't able to find one to borrow. I got an adapter for my Kenwood mic instead which finally came in on Friday. The problem did not go away with the mic swap.

I reproduced the problem last night so I could show you this morning, and as you know, this morning everything was fine.

Steven VE3PTA

Steven VE3PTA

 Post subject: Re: FT-101ZD Mic Audo
PostPosted: May Thu 02, 2019 2:02 pm 

Joined: Jul Wed 22, 2009 3:07 pm
Posts: 789
Hi Steve,

Looks like some measurements are in order!
The service manual (available somewhere on the net), on page 3-58 shows the schematics of the AF-UNIT (PB-1964), and on it shows the required audio signal levels as it progresses through the stages starting from the mic input in transmit mode.
There is also a relay in the path that switches over the circuit from receive to transmit.
I would suspect/check out that relay contact!

Regards, Peter

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