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K3S Lost Sensitivity On 40 Meters SOLVED

David Edger
 

Marc:

RX ANT button it was!  Nothing was showing on the screen on 40 but repeated button pushing resulted in a sudden improvement.  I think the RX button must have been stuck on by accident (I don't have a separate RX antenna.) 

Thank you for the tip.  I am feeling a bit sheepish about how easy it was to fix. 

Thanks everybody for your help. 
73 and stay healthy.

Dave N3CI

Dave Cole
 

Be thankful it was that easy!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 4/9/20 1:45 PM, David Edger wrote:
Marc:
RX ANT button it was!  Nothing was showing on the screen on 40 but repeated button pushing resulted in a sudden improvement.  I think the RX button must have been stuck on by accident (I don't have a separate RX antenna.)
Thank you for the tip.  I am feeling a bit sheepish about how easy it was to fix.
Thanks everybody for your help.
73 and stay healthy.
Dave N3CI

ab2tc
 

Hi Dave,

If the RX antenna port is selected you should see a small "RX" text icon on the screen, but it isn't very obvious. This is a most common error, so don't feel bad about it!

On the subject of the RX port usefulness, I don't have a separate RX antenna either. But I have an Elecraft XG3 signal generator permanently connected to that port. It's very useful to check that the receiver is working OK and the S-meter properly calibrated. With the XG3 turned off it's a pretty decent 50 ohm termination so is good for checking the receiver noise floor. Having an XG3 (or better, like an HP signal generator) in the shack is a must have for me. The RX (BNC) port never has any significant signal during TX so should pose no risk to attached instruments.

73, and yes, stay healthy.

AB2TC - Knut


On Thu, Apr 9, 2020 at 08:57 PM, David Edger wrote:
Marc:

RX ANT button it was!  Nothing was showing on the screen on 40 but repeated button pushing resulted in a sudden improvement.  I think the RX button must have been stuck on by accident (I don't have a separate RX antenna.)  

Thank you for the tip.  I am feeling a bit sheepish about how easy it was to fix.  

Thanks everybody for your help.  
73 and stay healthy.

Dave N3CI

K9MA
 

On 4/9/2020 23:02, ab2tc wrote:
The RX (BNC) port never has any significant signal during TX so should pose no risk to attached instruments.

Never, EVER, connect your signal generator to the TX antenna jack! (Learned the hard way.)

73,

Scott K9MA

-- 
Scott  K9MA

k9ma@...