Re: VLF: 838 Hz

To:	[email protected]
Subject:	Re: VLF: 838 Hz
From:	Roger Lapthorn <[email protected]>
Date:	Sat, 17 Jul 2010 19:05:20 +0100
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Hi Stefan,

The choice of frequency is simply because this is the sidetone frequency from my K1EL keyer IC that I use to generate the QRSS3 and 10wpm CW signal. It is quite stable too and perfectly suitable for 1-2 hours experimenting within 10km of home. The sidetone is low pass filtered and fed with some attenuation into my TDA2002 audio amp IC. The frequency misses 50Hz harmonics, but these have not been a major issue with my RX preamp which has 2 cascaded Sallen-Key HPF sections to reject 50Hz and its early harmonics.

73s
Roger G3XBM

2010/7/17 Stefan Schäfer <[email protected]>

Hi Roger,

I have just read about your todays ELF TX test on 838 Hz. Congrats!

Can you tell me why just exactly 838 Hz? Far away from 850 Hz and 800 Hz, clear, but why 838? Is there a reason?

73 and go on!

Today i had to cancel my antenna improvement work due to rain and thunderstorms in the morning but never mind...

Stefan/DK7FC

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G3XBM GQRP 1678 ISWL G11088

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