K3 Blank spots in RF gain contol

[Fred Atchley]

I just had an enlightening experience with the K3 RF gain control that may
help other K3 owners. As the RF gain control was rotated clockwise, a
significant drop in output occurred over a segment of 3 to 4 degrees at
about the 1 o'clock point. It seemed to me that the pot had a worn spot in
it (I'm an old analog type.)

However, when I contacted Elecraft Support, Gary recommended that I reload
FW and do an RF gain calibration. His suggestion worked! The RF gain now
works smoothly.

I hope this info is helpful. BTW, the Elecraft XG2 signal generator sure
made calibration easy. Thanks Elecraft Support.

73, Fred, AE6IC

 

 

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[KK7P]

> However, when I contacted Elecraft Support, Gary recommended that I reload
> FW and do an RF gain calibration. His suggestion worked! The RF gain now
> works smoothly.

The DSP uses a table of values which map hardware IF gain to the
hardware AGC voltage.  The default values happen to be the curve that
matches my development K3's characteristics :-)  The observation you
made on your radio's characteristics are the net difference between my
development radio's IF gain versus AGC voltage and your radio's similar
gain.

When you run the RF Gain Cal, the K3 measures the attenuation for your
particular radio and stores the results in non-volatile memory.

Enjoy!

73,

Lyle KK7P


______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html