Re: RF noise spectrum at k3eui QTH
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9 times out of 10 it is low grade close in rather than hi grade far away. Turn circuit breakers off one at a time. Sounds like it might be a UPS since you have harmonics which are notorious.
On Wednesday, June 12, 2024 at 11:19:56 AM EDT, K3EUI Barry <k3euibarry@...> wrote:
Here is my "noise level" revealed by the RSP
play SDR (hardware) and RSP spectrum analyzer (software)
The vertical scale is in dB? (from -100 to -30
dB).? I can't remember where the S-units correspond.
Antenna is a 50 ft horizontal "rain gutter"
with a 9:1 UNUN and 30 ft RG8X coax.
I tracked the RF on my "gutter antenna" from 0.1 MHz? to? 100 MHz?
(where I see the FM commercial broadcasts above 88 MHz)
I think the peak around 27 MHz is a CB truck on
Rt. 1 nearby.
Most of the "noise" fundamentals are below
2 MHz, but have harmonics way up to 30 MHz.
Then there are some "spikes" which have no
identity (yet). Not in the ham bands.
I can't hear any of the 80m NBEMS weekend nets
around the mid-atlantic region.
de k3eui
June 12 2024
top horizontal scale shows FREQUENCY every 10
MHz from 0 to 100 MHz
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