Schroedingers Cat said:
I think the calculator sites may use decimal degree equivalents vs. DMS for the FCC coordinates. But small amounts just may be GPS imprecision.
In any event, you are in a deep null. 3.5 miles to the 0.63 mV/m contour is pretty deep. In deep nulls you may have phase distortion that sounds like fading.
Yeah I can see that.
Also there was a little co-channel interference noticeable there, as well. BTW I was only briefly visiting that site, so I "WAS"
in a deep null. Here I'm about 9.3 miles at 187° heading from their transmitter, and it's a much stronger signal. The only "fading" is a ~72-74 Hz or so flutter caused by their carrier being off-frequency with the co-channels under them (the strongest being KLOK San Jose) when I null them.
Speaking of deep nulls, I'm quite sure that's not even close to the deepest null a station has.
I was thinking ... are there any 50kW (or more powerful for out-of-USA) stations with nulls so deep that you could use a sensitive communications receiver with a 50-foot-per-side tuned box loop, be completely unable to detect anything even with QRSS CW and an all-saltwater path, and yet be close enough so that if you were using a beverage the other end would be physically touching one of their towers?
Interesting about the GPS coordinates. Also I wonder if I'm sometimes trying to be a little too precise? For example, if I go to 32°53'43.568027"N 116°55'33.149326"W on Google Maps, it's supposed to put an indicator at the base of the 3rd tower (counting from west) in the 4-in-line portion of the array, which it does. (Google's satellite view at that location isn't high enough resolution for me to be able to tell which side of the tower base the pointer is on, or whether it's in the exact center of the guyed tower's base, though, and when overlaying adjacent coordinates I can only go to about 2 or maybe almost 3 decimal places on the seconds before it lays the indicators on top of each other.) However, it also puts a marker a whopping 249,661 millimeters away (according to the Google Maps measuring tool) at an address up the street. When I try to pull up the coordinates on my Android phone's Google Maps app, it ONLY pulls up the address - it will NOT give me the exact location of those coordinates.
And speaking of field intensities ... I noticed you apparently have a FIM. I don't know if you by any chance have one of those newer Si4734-based DSP Tecsun radios, but I was thinking ... Any idea what the approximate field might be at a location where, for example, a high-end comm receiver like a Drake, Collins, Icom (or something like a military unit that can handle relatively strong signals without overloading, intermodding, desensing, etc) would behave like
this (start ~0:51 or ~2:01) or
this (start ~1:04 or 0:45) WITHOUT any antenna connected at all?
Or do most FIMs not read field intensities that high?
(I was about a hundred meters from KCBQ's nearest tower right in the middle of their main lobe, using a Select-A-Tenna plus an inductively-coupled makeshift "beverage" disguised as an overhead utility line.) It's interesting how patterns can be set up so you don't have to go very far from having your radio being totally overloaded to having a weak signal.
