[Lowfer] re: Topband: One way propogation or QRM?

Wed, 30 Jan 2002 06:59:12 -0500

Got this from the topband reflector.  Thought it would be of interest
because of Mike's "Observation" thread.
JJ

>>
>>there have been discussions on this reflector about an enhanced path
about 1 
>>1/2
>>hours before sunrise. lots of guys have sensed this but there is no firm 
>>resolution
>>(i think). the gray area before sunrise has been proven to be an enhanced 
>>tx/rx
>>period on 160 meters. as an example- i worked more japan stations during the
>>1/2 hour before my sunrise than the previous 4 hours. i just could not hear 
>>them
>>before then. 9m2ax and bv3 were also heard then. i suspect that if you
would 
>>have
>>called me at that time we would have worked. i find that 12 minutes before 
>>sunrise
>>to be the peak-peak. (this should get some comments!)
>>
>>you are probably aware of all of this but here is my suggestion. locate the 
>>stations
>>who you want to work on a map or some program available on the internet.
>try <
>>map
>>quest.com> for the US. note their city and then check it against a
>dark/light 
>>program.
>>
>>
>>for others reading this email-how many minutes before sunrise is the 
>>"peak-peak"?
>>
>Larry and the group,
>
>QEX published an article in July-August 2001 on MF pre-sunrise enhancements
>which concentrated on the reception of a medium wave broadcaster from South
>Korea over a period of 2 1/2 years (I have to admit to having written it).
>The findings were that here in Victoria for one that one broadcaster was
>that signals tended to peak 5 to 50 minutes before local sunrise; somewhat
>closer to sunrise in the winter and towards solar minimum.   The automated
>logging of signal strength data from this and from an Australian
>broadcaster also in the 1.5 MHz range has been ongoing, and is now
>approaching the 4 1/2 year mark.  If anyone is interested in the findings,
>I'm happy to share them, but generally they agree with the above suggestion
>for the "peak peak".
>
>best wishes,
>
>Nick  
>
>VE7DXR
>****************************************************************************
>Nick Hall-Patch
>Victoria, B.C. 
>Canada
>
>e-mail: [email protected]
>(mail forwarded via [email protected])
>
>****************************************************************************
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