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| To: | <[email protected]> |
|---|---|
| Subject: | LF: SAQ 17.2 kHz |
| From: | "Peter Martinez" <[email protected]> |
| Date: | Sun, 21 May 2006 14:25:58 -0000 |
| Delivered-to: | [email protected] |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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From G3PLX:
After seeing the posting about the SAQ transmissions on
17.2kHz here, I thought I would try patching my audio spectrum analyser
program to sample at 48kHz instead of it's usual 8kHz. This would let me copy up
to 24kHz without having to plug in the soldering iron. It seemed to work find on
my new laptop, which it wouldn't have done on the slow old machine for
which I originally wrote the program. With a 6m whip plugged straight
into the laptop mike socket, the result was surprisingly
good:-
 What puzzles me is the UPWARD chirp. If putting the key down
increases the load on the generator, wouldn't this slow it down and make the
transmission chirp downwards? Or is it that the generator is free-running
slightly low and when the key goes down the generator is pulled UPWARDS onto the
antenna resonant frequency?
73
Peter G3PLX
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