(meteorobs) Gotta a bad feeling I lost 77MHz!

[Paul Goelz]

At 10:15 AM 8/22/2015, you wrote:

>may have spoke too soon....  turned the radio on and bam, the 
>hardest tone with a lot of fluttering on 77.25MHz, I had to drop my 
>volume to 2/10 to keep that tone down.

If there is a lot of fluttering, I would suspect that is a signal 
from some distance away that is temporarily enhanced due to 
propagation.  It may disappear as the propagation shifts.  The 
flutter can be propagation effects, airplanes or beats with other 
carrier(s) that you cannot detect by ear.

If you have a continuous hard tone, running a spectrogram on the 
receiver output can reveal meteor returns that you cannot easily 
detect by ear unless the carrier is so strong that is activates the 
receiver AGC.  It can also show you if the "flutter" you hear is 
doppler shift due to airplanes or just random propagation 
flutter.  If it is airplanes, you MAY also see some meteors in 
amongst the flutter unless the source is too close to you.

Paul


Paul Goelz
Rochester Hills, MI
pgoelz at comcast.net
www.pgoelz.com