[50mhz] Mystery QSB recording of 50.079.96

[Bill VanAlstyne, W5WVO]

I've listened to the recording, and IMO it's not a loose speaker wire, an
intermittent antenna connector, or receiver desense.

Reasons:

1) The noise floor is constant throughout the entire recording.

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.

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.

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.

Having said that, I'm unaware of any electromagnetic model that would explain
such an interaction between lightning and a signal path -- but then there's a
lot of things I'm unaware of.  ;-\

Bill / W5WVO
DM65


Buck - N4PGW wrote:
> Could it be receiver desensing? It sounds like a problem I have seen
> on 2 meters when I monitor a repeater where the car next to me is
> transmitting.
>
> Buck
>
>
>
>
>> -----Original Message-----
>> From: 50mhz-bounces at mailman.qth.net
>> [mailto:50mhz-bounces at mailman.qth.net] On Behalf Of Marvin L. Jones
>> Sent: Wednesday, April 27, 2005 1:28 PM
>> To: Ken Bessler
>> Cc: 50mhz at mailman.qth.net; FT-857 at yahoogroups.com; Dave KC0EMK
>> Subject: Re: [50mhz] Mystery QSB recording of 50.079.96
>>
>> On Wed, 27 Apr 2005, Ken Bessler wrote:
>>
>>> .............  I've never heard of lightning "helping"
>>> a signal before. There was a thunderstorm between my
>>> station and the beacon that night.
>>
>> I _have_ observed lightning enhancing 2M sigs.
>> Dunno if it would be effective on 6M, too.
>>
>> 73
>> Jonesy
>> --
>>   | Marvin L Jones       | jonz         |  W3DHJ   |  linux
>>   |  Gunnison, Colorado  |  @           |  Jonesy  |    OS/2     __
>>   |   7,703' -- 2,345m   |   config.com |  DM68mn                SK
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>
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