Links to RF and AM audio spectra below. The noise level is about 30 dB
above my usual noise floor at the same span. It is definitely
directional, so it's not internal to my station. It's certainly local.
I may have to see if any of my neighbors in that direction has recently
gotten an EV.
If anyone can find a clue as to the type of source from either spectrum,
Please let me know.
73,
Scott K9MA
https://sdellington.us/hr/RFI/10m_RF_25.10.18.png
https://sdellington.us/hr/RFI/10m_AM_25.10.18.jpg
On 10/16/2025 8:50 PM, Mike Fatchett W0MU wrote:
Take a picture with your phone............
W0MU
On 10/15/2025 10:11 PM, K9MA wrote:
In fact, the audio DOES tell us something: That modulation is clearly
audible. If I can hear that with a portable AM receiver, and it makes
no difference what frequency it is tuned to over a wide range, I'm
tracking the right source.
As I've said, the RF spectrum is virtually flat over the widest span
the K4 can display, 368 kHz. There's just no point in posting an
image, which really WILL tell us nothing. (And it's a pain to do with
the K4, as it can only save to a USB drive, not directly to the
computer.)
BTW, as of 04Z, 11 PM local, it's gone, so it's likely one of my
neighbors.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
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