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| Subject: | Re: LF: 'Ugly weekender' build: passive CW audio filter, used on MF |
| From: | Stefan Schäfer <[email protected]> |
| Date: | Sun, 19 Jan 2014 22:22:01 +0100 |
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Hello Wolf,Thanks, very interesting. Aaah, actually i should finish other projects before starting a new one, but this time it may actually become a short new project ;-) I will try something similar as well :-) An analog filter (without a PC) will allow full-BK CW operation :-) 73, Stefan/DK7FC Am 19.01.2014 13:47, schrieb wolf_dl4yhf: 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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