[GCARC] Signals Interference Question

[Prof. Showalter]

    I get the same thing in Bellmawr!



Glenn WB7QBZ


     How about the simple egg? ...." free range hens have outdoor access, are free roaming and are fed a 100% Organic diet with no animal byproducts. Our feed is totally drug-free and contains no GMO's, antibiotics, hormones, herbicides or pesticides. Our hens breathe fresh air and drink from fresh filtered natural water!"

ps...the bigger picture
http://www.pbs.org/wgbh/nova/earth/decoding-weather-machine.html



________________________________
From: gcarc-bounces at mailman.qth.net <gcarc-bounces at mailman.qth.net> on behalf of David Wade <amidebond at hotmail.com>
Sent: Friday, August 24, 2018 8:18 AM
To: gcarc at mailman.qth.net
Subject: [GCARC] Signals Interference Question

I live in Pitman, and have been receiving reception interference on my SDR receiver from a coordinated group of signals of unknown origin.  They do not seem to be emanating from within my residence, but I am not 100% certain of that yet.  I wonder if any GCARC member(s) might be able to explain this interference to me?

1) The coordinated group of signals occur within the frequency range of 4.7 - 8.4 MHz.
2) The strongest signals occur within the 6.3 - 6.7 MHz range, and the weaker signals occur on either side of this frequency range.
3) Most of the time, the signals are separated from each other by about 57 kHz.
4) The signals have a bandwidth of about 6 - 10 kHz.
5) The signals periodically, slowly, "sweep" back-and forth through a range of 20 kHz, and this "sweeping" motion is coordinated among many of the members of the group of signals.
6) The signals occur around the clock (i.e., 24 hours a day).

I can send a 2.75 Mb JPEG file with SDR receiver screenshots (frequency spectrum and associated waterfall data) that illustrate this interference to any interested GCARC member.

Due to the close proximity (12 miles) to Philadelphia International Airport, I wonder if these signals might be radar (e.g., A band radar)?  I attempted to contact the airport about these interfering signals, but have not yet received a reply.

Thanks to anyone who might be able to help solve this mystery.

David Wade (KD2NZS)
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