Chet, It sounds like you do not have sufficient audio drive.
In DATA A mode, how many ALC bars do you obtain? You must have 4 bars solid with the 5th one flashing. Adjust the audio levels from the computer to achieve that - I assume you are using LINE in.
73, Don W3FPR On 9/13/2021 3:56 PM, chetsubacco...@snet.net wrote:
My K3 transmitter has been struggling for months to behave. I've heard the service dept turnaround in CA is very long so I might not see it the rest of the year if I sent it in and wanted to avoid that if possible. I've followed advice suggested here with no lasting success. Especially on 6M the power sometimes takes a long time deciding to reach the setpoint. Sometimes it will be OK, but a few hours later after just sitting there, it again won't, and drops to a low output level. I've run the transmitter gain calibration routine again and again and it fails. Sometimes I get an ERRTXG on 160, 80, 40M. Sometimes the 5W calibration shows errtxg as it runs but the utility says the calibration had succeeded. I've checked that the bandpass filters are OK by using an antenna analyzer with an attenuator to check receiver sensitivity- all bands seem pretty close. I've rechecked if the LPA FET's are ok (I changed two last year), and set their bias current levels again and all seems well with them. I've upped the supply voltage- that seems to work for a day or two but then same old problems come back I've replaced the fwd and rev power meter Schottky diodes, no fix. Sometimes when the transmitter fails to reach the set power level, I can tweak the pwr knob and it will reach the changed level, but sometimes not and it falls back to a lower value. On 6M, while in "tune" if the power does not reach the setpoint (e.g. 30W) and I turn the pwr knob down below 12 where the 100w amp is bypassed and then turn it back up to reengage the 100w amp, the power will sometimes reach and stay at the setpoint (30W). But that condition does not stay Ok too long. The transverter output also exhibits similar power problems I've reloaded the firmware. The utility initially reported "checksum reconciliation value" and I have no idea what that means. And finally, this weekend, when I set the receive mode to data-a, the audio output had shifted to a higher freq spectrum width (e.g. 500-3300) on the WSJT spectrum display with clearly more hiss in the speaker. Cycling the xtal filters, normalling the shifts and widths had no effect. Changed the mode to USB and the audio spectrum was normal, change back to data-a and it was shifted. So I operated WSJT-X in USB. Hours later, data-a was back to normal. First time I've observed that. Today it is AOK. GOK what happened Saturday. Any other suggestions before I bit the bullet and prepare to send it to Elecraft? Thanks for any ideas. Chet, N8RA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@w3fpr.com
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