[Mich VHF UHF Society] PSK-31 observations EN71 to EN63

[Russell Dwarshuis]

Hi, Roger.  It was interesting hearing you even though copy was difficult.

There were 2 copies of your signal on my display, close enough in frequency so they overlapped.  That made copy difficult or impossible.  It went away when I beamed due north instead of the direct path, but then your signal was a lot weaker and QSB knocked out copy.  Maybe it was still there but inaudible/not visible, I can't be sure.  At one point you were 100% copy.  Beamed direct your signal was plenty strong, S5.

I saw you type something about frequency stability.  Your signal seemed stable enough apart from the affects mentioned above.

I suspect this is some weird multi-path affect, perhaps high altitude winds imparting a doppler shift on top of another copy of the signal from lower in the atmosphere.  Sometimes I hear similar affects on CW.

In this situation, RTTY probably would have worked better since the affect was only about 10 or 20 Hz, not the 170 Hz that would be required to mix up 0 and 1 on RTTY.  PSK31 requires a lot less signal to decode than RTTY, but signal strength wasn't the problem this time around.

73, Russ  KB8U

----- Original Message -----
From: "Roger Cox" <rgcox2 at gmail.com>
To: mivus at mivus.org
Sent: Monday, February 16, 2015 8:20:52 PM
Subject: [Mich VHF UHF Society] Testing PSK-31 on 144.150 tonight

I will be testing and calling CQ with PSK-31 on 144.150 tonight until 
about 8:45 pm.  Will be swinging the beam slowly between N-NE-E-SE-S and 
back.

73 Roger W8IO
EN63vc

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