[Elecraft] Raspy CW on 80 Meters

[Steve & Anne Ray]

I had not been on 80 for the several years I have had my K2, so a couple of
days ago I got on the lower end of 80 Meters and got several reports of my
CW sounding raspy or having AC hum.  I do not have this problem on any other
bands and it seems to be only on the lower end of 80 meters and when I run
more then 2 or 3 watts.   I am aware of the problem of transformers
effecting the K2 so I keep my power supplies below the desk.  The problem
appears to be only on the low end of 80 meters (3.7 and below).  I go up to
4.0 MHz and do not hear it.  My VCO voltages at 3.5 MHz is 2.0V and at 4.0
MHz is 6.5 volts.  I can adjust L30 to set the 4.0 MHz voltage to the
original 6.0V and it makes the 3.5 MHz voltage 1.8V.  Unfortunately I still
have the problem.

I am using a Astron 10A for my K2 and a Astron 20A for KPA100.


I do not think it is caused by magnetic coupling as I have moved my clock
and turned off the computer and monitor and it still occurs.

Any ideas.

Thanks

72,

Steve Ray K4JPN ex K1VKW
EM82ep Warner Robins GA
Elecraft K2 1422 & KPA-100
Heath Fan HW-101, HW-8