To: | <[email protected]> |
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Subject: | LF: RE: MF tonite |
From: | "Ken" <[email protected]> |
Date: | Thu, 13 Sep 2012 09:28:30 +0100 |
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Hi Stefan. What mechanical filter are you using?. 73. Ken M0KHW -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Stefan Schäfer Sent: 12 September 2012 21:02 To: [email protected] Subject: LF: MF tonite Christian, Are you QRV tonite? I would like to see or better hear the difference of my RX performance when using my band filter i was testing in the afternoon. It is the mechanical filter which uses source followers at the input and output, to provide a constant accurate impedance matching to keep the passband ripple as low as possible. The afternoons tests have been very promising, see https://dl.dropbox.com/u/19882028/MF/MF%20Filter.png This is the frequency response: https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.png There should be a much better image rejection now and so maybe a few more dB SNR... Unfortunately the filter does not cover the 502 kHz region. But this problem will be gone in some months... Will be on 472.5 kHz soon. 73, Stefan/DK7FC Am 12.09.2012 21:01, schrieb C. Groeger: > Thanks, mal for these wise words! > Df5qg (Homebrew& CW) > > Christian Groeger > > mal hamilton<[email protected]> schrieb: > > >> Never replace the MORSE KEY, you do at your peril !! >> Other modes come and go but MORSE lives on >> All Radio Operators know this. >> >> G3KEV >> >> |
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