[50mhz] Mystery QSB recording of 50.079.96

[Anthony W. DePrato WA4JQS]

>i have only listened to it 3 or 4 times in a hurry but
>
>Reasons:
>
>1) The noise floor is constant throughout the entire recording.

i find this to be true also.


>2) The timing of the drops/increases in signal strength don't sound like any
>kind of man-made effect, like another station transmitting. The effects sound
>randomly based, both in interval and duration.

this is also true


>3) The effect on signal strength appears binary -- either "on" or "off". 
>And the
>rise/fall time of the changes sounds virtually instantaneous, which pretty 
>much
>rules out typical AGC reaction to adjacent-channel signals. An analysis of the
>audio waveform on an oscilloscope could confirm (or refute) these subjective
>observations.

i will look into this when i get more time at work.


>So I'm tentatively throwing my vote into the "lightning" camp, because I can't
>think of any other phenomenon that would explain these specific symptoms.

this may be true but until we find out if the mp3 is raw data or processed 
before it was sent to us we will not be able to tell that ez. as for 
lighting clamping of the receiver audio . you will have to look at the time 
line intervals as lighting is a random timing occurrence. also the clamp 
time and agc recovery time of the receiver should be know . then you can 
look at the peak to peak signal voltage of both the suppressed wave and the 
non suppressed wave. i would also want to look at the rise and decay times 
of the signal. one other thing that should be know is lat and long of 
beacon lat and long of each of the two receiving stations  ant types  and 
headings at time of receiving and types of receivers used. the agc and NB 
settings would be nice to know also. I first thought it was a bad 
connection at the beacon as a quick look at the Scope showed the signal 
decreasing at a constant rate then returning to a constant high output. but 
without spending more time and knowing a few more details I am not so sure.
73 Tony
wa4jqs
on vhf since 1962