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Re: [IRCA] propagation article

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 Mark,
Thanks for posting this fascinating article, which I will probably need to read more than once! There are some interesting clues which may indeed be relevant to MW DX. The discussion regarding the angles of transmission and reception and ducting may hold at least partial explanations for reception differences in various locations.
Thanks and 73,
Craig BarnesWheat Ridge, CO    On Saturday, November 24, 2018, 8:38:51 PM MST, Nick Hall-Patch <nhp@xxxxxxxx> wrote:  
 
 I don't know how long you've been doing medium 
frequency work Ken, but these trans-polar 
conditions are pretty unusual most years except 
around a solar minimum. Even last fall, those 
sort of paths weren't open, although they did 
come a bit to life late in the winter.

best wishes,

Nick



At 01:35 2018-11-25, ken brookner wrote:

>It's an interesting article..ÃÂ Last evening, 
>about 7 pm local I worked Germany on 160 cw--he 
>was just above the noise.ÃÂ The night before I 
>heard Corsica on 160 about the same time.ÃÂ Very 
>strange propagation..ÃÂ At least in my experience.
>
>I guess it could just be that I've really 
>improved my receive antennas, though my transmit 
>antenna was never meant to work 160...ÃÂ This all left me scratching my head.
>
>Ken
>Lummi Island, WA
>
>>Joseph Miller <mailto:kj8o.ham@xxxxxxxxx>
>>Saturday, November 24, 2018 5:06 PM
>>Well, yeah, that was new term for me as well. I did a web search and found
>>an interesting article by Bob Brown NM7M PhD UC Berkeley (
>>http://www.astrosurf.com/luxorion/qsl-hf-tutorial-nm7m5.htm ) and I found a
>>short explanation about halfway down the page. Maybe I can read the entire
>>article.
>
>>Last winter, while still living in S.E. Michigan, I may have experienced
>>this phenomenon when in just one evening session, I logged 7 NDBs from
>>Nunavut (6 of which I had never heard before).
>
>>Here's hoping this will shed some light on things.
>
>>Vy 73 de Joe KJ8O
>
>
>
>>Volodya S <mailto:canswl@xxxxxxxxx>
>>Saturday, November 24, 2018 4:49 PM
>>A great article, Mark. Thanks for sharing with us. There was a new term
>>that I had never heard of before, and perhaps someone smarter than me can
>>explain it further: Gyrofrequency. The map didn't have much information
>>for North America compared to other places in the world, and was quite
>>high, into the X-band here. I'll have to re-read it to see whether I grasp
>>that concept. Ducting, which we were all familiar with in MW DXing is
>>prominent in the article I'm not quite finished all of it, yet....Walt
>
>>On Sat, Nov 24, 2018 at 7:01 PM Mark Connelly via IRCA <
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Nick Hall-Patch
Victoria, BC
Canada 

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