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| Subject: | LF: 1.9kHz earth-mode tests today |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Wed, 16 Jun 2010 22:03:40 +0100 |
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Today I modified my 4W VLF transmitter so it could send either a 10 wpm or QRSS3
beacon signal. I also went out into the fields with my loop/preamp and a
PC with Spectran to
receive it. For the first attempt with a PC I went 0.3km away from home
where the 4W signal from the earth electrode "antenna" could clearly be
received by ear. With Spectran I could read the 10wpm CW signal with
20dB S/N in a 12Hz bandwidth, if my understanding of the Spectran
settings is right. There is an audio
recording here so you can judge the S/N yourselves. This suggests
that with QRSS3 (or slower still) and really screwing the bandwidth down I should be able
to do much better. My problem is knowing how to calibrate the soundcard
etc and clearly I need a more stable source than my free running
twin-tee audio oscillator.
I am a total novice when it comes to using QRSS and soundcards using very narrow bandwidths. 73s Roger G3XBM -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088
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