On Tue, Apr 28, 2020 at 10:36 AM, Rick Levine wrote:
Unfortunately, the only solution I've found for the FT-60 has been to put a headset into an external speaker mic.
Also, the FT-60 has some nasty bias voltage (~3v!) on the audio output, which makes a loud thump in a headset when the radio unmutes. One solution is to make a short jumper cable with a 3.5mm stereo jack on one end and a mono plug on the other. In my case, driving a Sony 7506 headset, two .33?f dipped caps in parallel with the audio signal fit neatly in the stereo jack shell,?one lead to the tip and the other across both audio lines in the cable. They block the bias voltage, and also filter out a bit of low frequency noise.
The thumping is not as much of an issue with earbuds, as the smaller diaphragms in the earbuds don't jump around as violently as the larger ones in over-the-ear phones.
Rick
KK6WHJ
?Hi Rick and thanks for the reply.? Others have mentioned buying a speaker mic and plugging in a headset...not what I want.? I don't want a mic, just to listen.
But since you mentioned the DC bias problem you gave me an idea.? I think what I'm going to do is look for a right angle TRRS male plug that comes apart.? Then I'll find a pair of earbuds that I like, cut off whatever plug is on them, and then wire them to the right angle TRRS male plug and put the capacitors inside like you suggested.
I found this plug on Amazon but I'm not about to spend almost $20 for a silly right angle plug:
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Instead what I may do is buy one of these:
and on the un-terminated end install a 3.5 mm TRS JACK (easy to find and inexpensive) to plug the earbuds into and put the capacitors inside the jack housing.? I'm leaning towards this so I can use any headphones including my Sony 7506's if I want.
Regardless, a pain in the butt and maybe not worth the effort.? Just wish I could buy something but I don't think it exists.
73,
Gary K9GS
