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Re: LF: wspr-15 frequency tolerance

from [Minto Witteveen] [Permanent Link][Original]
To: <[email protected]>
Subject: Re: LF: wspr-15 frequency tolerance
From: Minto Witteveen <[email protected]>
Date: Tue, 19 Feb 2013 22:55:08 +0100
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Yes I am curious too..
I already found out that an FSK shift of 0.1746 Hz instead of 0.1831 (-4.6%) poses no problem.
Also my AD9850 DDS board will creep between 0,5 and 1 Hz during a 15 minute TX period (slowly getting higher in frequency due to the TX heating up a bit).  Does not seem to bother the RX software.

Minto pa3bca

 
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Ceterum censeo Carthaginem delendam esse
 
From: Graham
Sent: Tuesday, February 19, 2013 22:41
Subject: LF: wspr-15 frequency tolerance
 
Anyone  a  clue as  to the  limits  of    wspr-15   frequency tolerance ?
short / long  term  drift   / jitter  in the  15 min  cycle ?
 
Tnx -G..
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