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Originally Posted by brentb636
Or get all the bird owners to turn up the gain pots.  |
This mention of "birds" and signal level reminds me of something that happened to me several years ago.
One of my hobbies is monitoring military aircraft on my scanners, so I have scanners running all day long on the milair bands. Well back in Feb, several years ago, my scanner suddenly stopped on 282.2 MHz, which is one of the air traffic control freqs around here, but instead of hearing planes talk to the controllers, I was hearing "chirp chirp chirp". This went on for a while, then stopped. I thought that was strange, but put it out of my mind. Then the next day, about the same time, same freq, "Chirp chirp chirp". Then I heard a loud crashing sound, and happened to look outside to see a squirrel jumping on my birdfeeder. Then I remembered..... I got this crazy gadget for XMAS, more than a month earlier, which was a bird sound transmitter. You put this gadget out by your birdfeeder, and then tune in via an FM radio. I used this for a few hours, then grew tired of it, and actually forgot that I had the thing out there. Apparently, the thing transmitted somewhere in the 55-60 MHz range, and the 1st harmonic was in the FM band, but another harmonic ended up in the milair band, but the thing was drifting with temperature change, and the drift would take it right through one of the freqs I monitored each day.
I had actually notice interferrence from the thing for several weeks, but it was only when I heard the bird and squirrel noises that I was able to identify where the interferrence was coming from. Ie the Birds turned up the gain pots as you say above.
But I thought it was pretty neat to hear chickadees transmitting on the milair band. I was wondering if the planes up there could hear this.
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