Interesting! Other observations in this thread have been with respect
to FT8 signals on 6M.
73, Jim K9YC
On 7/23/2023 7:45 PM, Jim Brown wrote:
Andy,
My observations here are consistent with yours -- I regularly see
Doppler on either side of a signal, sometimes even both sides, which
would be consistent with multiple aircraft. And without Doppler, I
always see low level sidebands on locals that are approximately
symmetrical with the P3/SVGA cranked to minimum span. Last season, Trey
and I were seeing a neighbor being much wider than normal. Trey went to
his shack to help him figure it out while I watched on the P3. It was
coming from his Expert amp, and we managed a modest improvement. If I'm
remembering correctly, he was running the amp on the low voltage setting.
73, Jim K9YC
On 7/23/2023 6:30 PM, Andy Durbin wrote:
The aircraft that can be expected to cause Doppler shifted reflection
in the Phoenix Class B airspace are transport aircraft following
Standard Instrument Departures (SID) and Standard Terminal Arrival
Route (STAR) routings. My QTH is about a mile from a KPHX STAR
(BRUSR ONE). On a busy day with winds out of the East they go by at
about one per minute. As they approach from the North I would expect
reflections with a higher frequency. After they pass and move to the
South I would expect reflections with a lower frequency. With
multiple aircraft following the same route I would expect a mix of
reflected signal frequencies spread on each side of the transmitted
signal frequency.
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