Problem: Very low to no output on K3 line out jack (for PSK31 use) I am trying to get PSK31 running on my MacbookAir with Cocomodem (through a iMic, to USB port). It has run before, several years ago. I follow K3 manual setup and find the output level is very low. On Cocomodem waterfall, I can see very, very weak signals, could just be noise. I am in Data mode, Data A set. I adjust LIN OUT in Config to maximum, a very slight change in waterfall level. I tried plugging in headphones into the Line out jack to see if there was any change. I hear nothing. I also swapped out my MacbookAir for an iMac desktop, with no change in the problem.
To check everything else, I switched cable from Line out jack to Headphones jack, and change the LIN OUT in Config Menu to ‘Headphones’ per the manual. Use same cable and iMic as before. Now, I get signals on the waterfall, and can decode many in CocoModem. So, everything works except the K3 Line out signal. Per tech support, I download schematics and I remove Audio out board to check the chokes, L1 and L2. Read about 4ohms, as do all the similar chokes on the board. Working backwards, I check the transformer that feed the in and out line. T1 and T2 read about 55 ohms on the secondary, seems about right. I did swap out the audio jack board for a replacement from Electraft, thinking it could be a jack problem. No change. Am I missing something simple here? A Menu setting? If not, next troubleshooting steps? OK to email direct instead of posting. 73 Randy - K6CRC [email protected] <mailto:[email protected]> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
