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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Re: DK7FC's 7th VLF kite experiment |
| From: | pws <[email protected]> |
| Date: | Sun, 10 Oct 2010 21:13:25 +0200 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <6F6098420211436FABB78BE04E5F8FAD@JimPC> <000901cb6215$2db60550$0401a8c0@xphd97xgq27nyf> <[email protected]> <B4EA2F5BDC754BC0AD7DFE6ABD01E8A2@Black> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <2024E84F348A4A039481951F65394FA7@JimPC> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
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Hi Stefan, You wrote: > ... > How have you found that? By guessing? :-) > ... The only guess was the sample rate used, 48 kHz. (@Daniele: 48/2 = 24 kHz) Many months ago I made some tests with a cheap USB-sound-system running at 48 kHz of sample rate. It has almost no anti-aliasing filters in front. Using a ferrite antenna & 60dB pre-amp (*.*) five higher Nyquist ranges could be seen folded in back and forth - a very special type of "Harmonic Mixing". I had the silly idea of recording all available signals at one shot, forgetting that all horrible local interferences will accumulate too inside 0-24 kHz... http://www.df3lp.de/misc/multinyquist-2.png . 73 from Kiel, Peter |
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