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| To: | RSGB LF Group at blacksheep <[email protected]>, RSGB LF Group at Yahoo <[email protected]> |
|---|---|
| Subject: | LF: 'Ugly weekender' build: passive CW audio filter, used on MF |
| From: | wolf_dl4yhf <[email protected]> |
| Date: | Sun, 19 Jan 2014 13:47:46 +0100 |
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Greetings all,I took the opportunity yesterday evening (with lots of stations crowded within a few hundred Hertz on MF) to test this ridiculously simple "passive narrow-band audio filter" on air (between RX and headphone) : http://www.qsl.net/dl4yhf/passive_lc_audio_filter/passive_lc_cw_audio_filter.htm(just two LC resonators, one of them adjustable with a 'hex' rotary switch ie 16 different selectable center frequencies). The results were quite stunning, compared with a long FIR filter (implemented in software), this ugly design helped a lot in the QRM / QRN .. less 'ringing' than expected from such a simple circuit. 73, Wolf DL4YHF . |
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