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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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9th Oct 2020, 6:05 pm | #1 |
Diode
Join Date: Oct 2020
Location: Guildford, Surrey, UK.
Posts: 6
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Yaesu FT-101Z no tune-up on 20m
Dear All,
I have a recently-acquired Yaesu FT-101Z. All is well except it will not tune-up on 20m. Specifically, when in Tune mode, MOX positoin, I get a bias current of 50mA on the IC meter. However, when I increase Drive there is no change in current. Any thoughts? Best regards, Malcolm. |
9th Oct 2020, 6:53 pm | #2 |
Triode
Join Date: Jul 2016
Location: Hilversum, Netherlands
Posts: 33
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Re: Yaesu FT-101Z no tune-up on 20m
Probably one of the switch wafers damaged/burnt out.
Other issue can be with the crystal oscillator. Missing or dead crystal. I assume it will receive signals on 20 m ? otherwise the band selector switch can have a issue. |
9th Oct 2020, 6:59 pm | #3 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,902
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Re: Yaesu FT-101Z no tune-up on 20m
I think it uses the same variable capacitor for receive preselector as for peaking up the drive, so it's worth checking the receive preselector peaks up normally.
David
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10th Oct 2020, 7:32 pm | #4 |
Diode
Join Date: Sep 2020
Location: Bath, NE Somerset, UK
Posts: 4
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Re: Yaesu FT-101Z no tune-up on 20m
Hi
My thoughts would be the same as the other responses. If it's dead on receive on 20 it might be a duff 20m crystal on the premix local PCB (PB-1965) If it's just tx on that band it could point to some cleaning needed on the band switch 73, Dave |