[Elecraft] Possible issue with K3 Line In port?

[Joe Subich, W4TV]

Check L4 and L5 on the KIO3 Audio Input board.  They are in series with
the Line IN audio and return lines and have been known to open.  The
quick fix is to simply bypass them with jumpers.

73,

    ... Joe, W4TV


On 2019-06-24 9:29 AM, Paula Uscian wrote:
> I suspect I may have an issue with the Line In port of my K3, as my ability to TX in any digital mode has gone away.
> 
> Setup:
> 1. Using a Tascam US-122 MKII outboard sound card.
> 2. MIC SEL is set to Line In on the K3.
> 3. Digital software, e.g., WinWarbler and WSJT, have the Tascam selected for TX and RX.
> 4. Mode selection for FT8 is set to Data, for RTTY is set to AFSK 45 bps.
> 5. Levels are the same as when this system worked – K3 Mic level is set around 43-44.
> 
> Symptoms:
> 1. When I try to TX on FT8 from within WSJT, the K3 red TX light comes on and over my headphones I can hear a steady tuning tone, but I have no power out, not one bar.
> 2. During TX I do hear “behind” the tones a brief low level buzzy/crackly sound that recurs every second or so.
> 3. I get the same results as above when trying to TX in WSJT, though I hear tones typical of a transmission vs. a steady tone.
> 4. I get the same results as above when I switch to RTTY and TX within WinWarbler; RYRYRY, but no power out.
> 5. The Tascam and WSJT work fine together to decode FT8 signals.
> 
> T-shooting Steps to Date:
> 1. Uninstalled, rebooted and reinstalled all Tascam software and current drivers. Same results.
> 2. Tried the Line Out from the internal PC soundcard to the Line In on the K3. This also involved using a different cable from that connecting the Tascam to the K3. Reconfigured the digital software to use the internal sound card for TX. Same results as described above (including the noise).
> 3. Verified the K3 does TX (at least on CW).
> 
> I suspect the board with the Line In port may have gone bad, but not sure if that’s the issue. If so, is there anything further worth checking or should I just replace the board?
> 
> Thanks for any guidance!
> 
> 73 Paula k9ir
> 
> Sent from Mail for Windows 10
> 
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