Hy Ken,
the name of the mechanical filter is FZ02
http://www.oppermann-electronic.de/html/hf-spezialbauteile.html
http://dm4tr.bplaced.net/index.php?section=Receiver
73
Thomas DM4TR
----- Original Message ----- From: "Ken" <[email protected]>
To: <[email protected]>
Sent: Thursday, September 13, 2012 10:28 AM
Subject: LF: RE: MF tonite
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
