Hi Stefan
Good "real" CW signals on 477 kHz and nice tune-up!
73 Terry
-----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
477 DK7FC.jpg
Description: JPEG image
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