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.
Changing CONFIG:LINE OUT to HEADPHONES does not convert the headphone
jack to a Line Out jack. It simply routes headphone audio to the
LINE CODEC. If you do not have audio from the LINE OUT jack, the
problems are in the CODEC (DSP board), the audio transformers KIO3
board, the jack or the RF chokes.
Per tech support, I download schematics and I remove Audio out board
to check the chokes, L1 and L2.
Does your Audio IO Board have a choke at L3? If so, check it carefully.
I have seen L3 fail multiple times which always results in no Line Out
audio.
73,
... Joe, W4TV
On 2015-01-25 5:51 PM, Randy Cook wrote:
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 k6cr...@gmail.com mailto:k6cr...@gmail.com
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