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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> <EF76E5CF7FCB43F38C1CF49114119176@lindavideo> <62B8952382DF4DB294DF41CA351C4188@Notebook> <5051C2B6.8080303@iup.uni-heidelberg.de>
Date: Thu, 13 Sep 2012 19:43:34 +0100
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Subject: RE: LF: Re: RE: MF tonite
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Stefan.
Thank you for the info, maybe sometime you will be able to post the =
circuit?

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: 13 September 2012 12:26
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: RE: MF tonite

Ah yes, Thomas was faster, damn ;-)

Another image from the experimental setup, using source followers=20
https://dl.dropbox.com/u/19882028/MF/Mechanical_filter_with_source-follow=
ers
.JPG
The results have been very good last night!

73, Stefan/DK7FC


Am 13.09.2012 13:12, schrieb Thomas Rosenkranz:
> Hy Ken,
>
> the name of the mechanical filter is FZ02=20
> http://www.oppermann-electronic.de/html/hf-spezialbauteile.html
>
> http://dm4tr.bplaced.net/index.php?section=3DReceiver
>
> 73
> Thomas DM4TR
>
>
> ----- Original Message ----- From: "Ken" <ken.h.wright@btinternet.com>
> To: <rsgb_lf_group@blacksheep.org>
> 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: 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=20
> 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.pn=
g

>
>
> 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<g3kevmal@talktalk.net>  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
>>>
>>>
>
>