[NCARC] propagation -- interesting echo on HF

[Dan W7RF]

Hi Chris,

It is most likely polar flutter, since the usual path is an over the pole
path. Signals arriving from multipath (longpath + shortpath) is more remote.

A good tool for propagation prediction based on SFI values K values is W6EL
MINIPROP 
Available for free at http://www.qsl.net/w6elprop/ 

Also, nice to see a new cluster of sunspots pushing up the SFI to 82 at this
moment! Where were these spots for the 10M contest last weekend?

Good to hear you on the air. I keep trying to improve my antennas all the
time and have been stopped for a while by the winter WX and snow. 
What are your plans for new antennas?

73, Dan W7RF 
President NCARC 2009 W0UPS
Rocky Mountain DX Club W0PA
Mile High DX Association K0AB



-----Original Message-----
From: chris at yipyap.com [mailto:chris at yipyap.com] 
Sent: Wednesday, December 16, 2009 8:23 AM
To: ncarc at mailman.qth.net
Subject: [NCARC] propagation -- interesting echo on HF

Had an interesting thing happen this morning.

I was tuning around 40 meters CW and heard a station from Moscow, Russia.
He had a very interesting echo effect going on.  I recorded it into my PC
and brought up a program that lets me look at the audio waveform.
I figure the delay was 0.076 seconds.  That's about 14,000 miles at the
speed of light. 

Going to do a little more research.  I think maybe the echo was a long-path
reception of the same signal, but 14,000 doesn't seem like the right number
for longpath difference.

Chris
w0ep


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