To: | [email protected] |
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Subject: | Re: LF: WSPR - G0NBD |
From: | "Johan H. Bodin" <[email protected]> |
Date: | Thu, 29 Jan 2009 10:26:16 +0100 |
In-reply-to: | <3692CCEF55434A78A271B29E8D4BC318@JimPC> |
References: | <00c701c9818b$2aac4520$6401a8c0@asus> <16976E02F609403791409C408C93AFCA@AGB> <3692CCEF55434A78A271B29E8D4BC318@JimPC> |
Reply-to: | [email protected] |
Sender: | [email protected] |
User-agent: | Thunderbird 2.0.0.19 (Windows/20081209) |
James Moritz wrote: > Eventually, I realised that the > difference was that your transmissions are a few seconds shorter than > the locally generated signals Dear Jim, LF, that is a clear evidence of a soundcard sampling rate error. I am quite sure that all timing in the WSPR software is derived from the sampling frequency and, if memory serves me, the WSPR program uses a sampling rate of 12kHz. If the soundcard does not support this rate and/or has a "physical" sampling rate that is not a multiple of 12kHz (for example 44.1 kHz), then the driver or window$ will kick in a "resampler" between the soundcard and the WSPR application which is asking for 12kHz. Many such resamplers are known to be inaccurate... 73 Johan SM6LKM |
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