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From: "Ken" <ken.h.wright@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <h0drfa73usb6ft8xspd0sl8j.1347476481893@email.android.com> <5050EA23.1040802@iup.uni-heidelberg.de>
Date: Thu, 13 Sep 2012 09:28:30 +0100
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Thread-index: Ac2RIhuBS/nf4b8iQ+KABqcDwF+lDgAZzsKw
Subject: LF: RE: MF tonite
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Hi Stefan.
What mechanical filter are you using?.
73.
Ken
M0KHW

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan =
Sch=E4fer
Sent: 12 September 2012 21:02
To: rsgb_lf_group@blacksheep.org
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=20
passband ripple as low as possible. The afternoons tests have been very=20
promising, see https://dl.dropbox.com/u/19882028/MF/MF%20Filter.png
This is the frequency response:=20
https://dl.dropbox.com/u/19882028/MF/473%20kHz%20ZF%20Filter%2040%20dB.pn=
g

There should be a much better image rejection now and so maybe a few=20
more dB SNR... Unfortunately the filter does not cover the 502 kHz=20
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<g3kevmal@talktalk.net>  schrieb:
>
>   =20
>> 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
>>
>>     =20