[Elecraft] K3 Plasma TV and other non OT junque

[Edward R. Cole]

I had a scare last weekend when my SDR-IQ showed a huge level of 
noise on the 500-KHz experimental band.  The level was over 1000uV 
and drove the SDR into clipping with potential damage to the front 
end.  This got me investigating with the K3 showing S9+60 full-tilt 
noise on 500-KHz.  I checked how wide the noise was and observed it 
from 300-KHz up above 14-MHz.  Strongest on MW freq. and 160m, S9+40 
on 80m, tapering to S9 on 20m.  Fortunately, it disappeared and has 
not returned.  Maybe their favorite football team lost and the shut 
off the TV?  Hopefully, they threw a beer bottle threw the 
screen.  Of course it may not have been a plasma TV but a neighbor 
doing some welding at 10pm?

I have buried utilities in the subdivision with electric poles about 
1/4-mile away E or W and none for a mile N or S.  Previous noise 
floor was S5 on 500-KHz with the K3, S3 on 80m and S2 on 20m.  The 
SDR-IQ shows -115 to -108 dBm for the 500-KHz noise floor.


73, Ed - KL7UW, WD2XSH/45
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BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
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