[Elecraft] Elecraft K3 problem

[John Simmons]

Did you check the antenna selection?


-- 
73,
-John NI0K
https://www.qrz.com/db/NI0K
LA7NO wrote on 7/27/2020 7:50 AM:
> Hello,
>
> The K3 suddenly stopped working.
> One day all OK, the next day serious problems.
>
> Serial no.: 07818.
> It has ATU and 100 W PA installed, and also a P3 connected.
> Both K3 and P3 were earlier well calibrated.
> Supply: 14,5 VDC.
>
> Symptoms:
> - Rx seriously reduced sensitivity, only strong signals to be heard.
> - No Tx output. Tuning not successful, no SWR indicated (only the 3
> hyphens).
> - Same on all bands.
> - All displays, controls and menus apparently working normal.
> - Mic-gain & ALC normal indication on SSB.
>
> All menu settings seem to be OK.
>
> Connected an XG3 and injected a -73 dBm signal.
> It showed up on all bands with signal level about -100 dBm, so around 30 dB
> attenuation.
>
> Connected a LP-100A and a 50 ohm dummy load.
> Whatever we tried, the LP-100A indicated zero power out on all bands.
> Same on both Ant1 and Ant2.
> Bypassed the ATU: no change.
> Set power to < 10 W, effectively bypassing the PA: no change.
>
> It is clearly something that is common for both Rx and Tx.
> It is independent of the selected band.
> Apparently not related to ATU or PA.
>
> So, it could be some relay problem, or related to the SWR bridge or
> LP-filters.
>
> Hope you can give some helpful ideas on how to proceed.
>
> Best regards & 73 from Norway,
>
> Per-Tore / LA7NO
>
>
>
>
> -----
> 73,
>
> Per-Tore / LA7NO
>
> --
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