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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: LF/MF REPORTS |
| From: | "Roelof Bakker" <[email protected]> |
| Date: | Sat, 23 May 2009 12:45:29 -0000 |
| In-reply-to: | <[email protected]> |
| References: | <003601c9daf5$0351b960$0301a8c0@mal769a60aa920> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Opera Mail/9.63 (Win32) |
Hello Richard,It has been found that the brain of a skilled CW operator can simulate a filter as narrow as 50 Hz. The difference in noise power between a 60 Hz and 50 Hz filter is 0.79 dB. So either your FT1000 DSP filter is a bit wider or your brain filter is a bit narrower. For slow morse (10 w.p.m.) it can be advantageous to use a filter as narrow as 10 Hz. This will give a 7 dB better S/N ratio than your brain will provide. With weak signals, this really helps. 73, Roelof Bakker, pa0rdt |
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