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Hi FT-847 users,
I have the problem with my FT-847 that with FM the squelch closes a little, but when turning the knob further to the right, the squelch opens again. If the squelch knob were a clock face and if there is no signal on the VHF/UHF band: So if the knob starts at 7 o'clock and the squelch closes at 8 o'clock, it opens again at about 11 o'clock and then remains open until the right stop. With SSB everything works fine. I would venture over with meters, oscilloscope etc if I knew where to start. Is there a comparator or Schmitt trigger where I can start my search? Circuit diagram is available. Thanks for reading! 73, Tom, DJ6TB |
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As a last ditch resort before replacing the pot, I have dismantled them before and given them a clean. Generally the wiper either gets corrosion on it or it's just general dirt buildup (use switch cleaner or my preferred method of ipa). They are usually very easy to take apart by bending a couple of clips that you can easily bend back afterwards. Good luck finding a replacement if you have to, as spare parts are now very few and far between unless you buy used, which comes with its own potential problems. Good luck M0CNL On Mon, Dec 19, 2022 at 1:44 PM gw3fsp via <gw3fsp.ldavies=[email protected]> wrote: I had that problem, try cleaning the track in the pot, dribble some cleaner (alcohol say) down the shaft with the set on it's back with the knob off, if that does not work it's a replacement pot usually. |
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Thanks for your help, but if it were the potentiometer, why does
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everything work fine on SSB? There must be something defective or adjusted in the area Sqelch or AGC, or? 73, Tom Am 21.12.2022 um 10:19 schrieb m1cxz m0cnl: As a last ditch resort before replacing the pot, I have dismantled |
gw3fsp