[Elecraft] K3s - No transmit - Resolved

[Gary Smith]

Thank God!

I have been working with two separate K3's without the sub and they 
have a jumper that has to be removed from connector J64A on the RF 
board before you install the KNB3 SUBIN Board. I remembered seeing 
those jumpers on these K3's and also, I had some difficulty removing 
the Sub Rx to get at the filters (the coax were binding & making it 
tougher to remove) and in the the process of removing the Sub Rx, the 
SUBIN board came out, attached to the pins on the Sub Rx deck. 

I started thinking of what variables there were & remembered from 
building my K3, that that jumper had to be there for transmit. Then 
it clicked; I wondered if maybe I hadn't replaced the SUBIN correctly 
and if so, maybe that misalignment was the cause of the problem with 
now having no transmit.

Removed everything again & got a better light in there and sure 
enough, the pins were one off. Re-installed it mo' bettah and 
replaced the Sub Rx and now all is as it should be; transmitting with 
a smile & hearing a fly hiccup at 20 feet.

Maybe someone else will find this on Nabble someday, looking for old 
threads on the subject, while trying to figure out what went wrong 
with transmit after replacing filters with a sub Rx board.

Time for a nice IPA...

73 & Thanks Don & Kevin, I appreciate the replies to help me.

Gary
KA1J

> I just added some filters to the K3s and configured the filters with 
> the K3 config. The radio hears perfectly on all the modes and the 
> filters are working beautifully. now however, it does not transmit. 
> It is not in test mode.
> 
> I did nothing else to the radio while I had it open.
> 
> Tapping a key, SSB or pressing XMIT and there is zero output.this at 
> 1W or 25W. 
> 
> The red TX LED lights. 
> 
> It signals the relay in the amp properly. 
> 
> On the P3 transmit monitor I see .02-.03W PEP registering, no SWR 
> reading and the LP-100A shows no sign of a signal. 
> 
> I restored a known good configuration with no change. 
> 
> No error messages are showing, no warning message on startup.
> 
> 13.6 V on the K3 meter.
> 
> trying the ATU, it shows 5W on the display, relays clack, no output 
> on the P3 output except that .02-.03W & nothing on the LP100A
> 
> I have triple checked to be sure all the coax to the Synths, TXCO & 
> Sub are attached properly.
> 
> I have made sure all the connections to the sub RX are inserted 
> properly.
> 
> I must be missing something obvious. Any ideas what I might look at?
> 
> Thanks
> 
> Gary
> KA1J
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