[Elecraft] K3 on 50 MHz - noise and possible harmonics

[KD7PY]

If you are unlucky as me and live in the city you will have a high noise
level. during the morning hours my
noise level is S1 with the 2nd bar just blinking with the preamp in the K3
on. later in the day when everyone is home the noise goes to S3>S4 as the
load on the power grid goes up.

I checked my K3 on a dummy load and I found only a few birdies internal to
the K3
50.023
50.044
50.147.3

watching the birds on the P3 they move as I turn the VFO 
Interesting that I only hear the birds with the preamp in the K3 turned on
or off. with the external ARR preamp on I don't hear them, but with my 5 el
beam the noise is high enough that I only use the K3's preamp. I only notice
the bird at 50.147, the rest are below the noise floor with the antenna on.
 
the only way to check for internal birds in the K3 is to check it with a
dummy load connected.
you say that the birds are spaced 30 khz apart should tell you that some
device external to the K3 is causing them. a beam is very helpful in nulling
out the interference. it's best to check out your house 1st for the
offending device, unplug everything one at a time and check to see if they
are gone. 
Ed



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