Hi Anaxi, I replied twice but the web page kept freezing towards the end of an extended post and I lost heart!
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It happens as soon as the radio is turned on.
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Connect mic only- all OK.
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Connect key only- all OK.
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Connect mic and key- OK to use key.
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Connect mic and key- PTT and it locks up for hours.
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This is on internal NiMh pack, various external battery packs, ProAudio Engineering PSU and other PSUs.
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This is with a selection of dummy loads including a Bird 300 watts example. Chokes everywhere didn't work.
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Because it only happened when I PTT, I naturally suspected the mic. I tried three Yaesu mics (one having a replacement Racal insert) but still no good. I would try a choke on the mic and different mics and think I had a cure, but then it would lock up again. Eventually I realised I was trying to cure the mic and so did not have the key connected. Sure enough, when I also connected a key it locked up on PTT. I tried a screened key lead and it seemed to work. Then it locked up again. I tried two chokes on the screened lead and it seemed OK, but then it locked up again. What I had failed to do was record the power levels whenever it happened and my "fix" nay have been at a lower power level. As of now I cannot be bothered with it any more. It's clearly an RF issue, but off grid on a dummy load? Really? I'm sick of this radio, no one should have to tolerate this, least of all all the folks who have had to put up with me going on about it.
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Phew!
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Steve, G4VRR.