Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id E0340380000B0; Fri, 29 Jun 2012 17:57:01 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SkjAk-0003wY-Aj for rs_out_1@blacksheep.org; Fri, 29 Jun 2012 22:56:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SkjAj-0003wP-Nk for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:56:13 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1SkjAh-0000lG-4e for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:56:12 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q5TLuADc028342 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 29 Jun 2012 23:56:10 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q5TLuAYw014337 for ; Fri, 29 Jun 2012 23:56:10 +0200 Message-ID: <4FEE2407.3050603@iup.uni-heidelberg.de> Date: Fri, 29 Jun 2012 23:54:15 +0200 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <00a901cd563a$b02b6be0$0200a8c0@boxa> In-Reply-To: <00a901cd563a$b02b6be0$0200a8c0@boxa> X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: MF, It becomes better! I just realised that this filter is perfect to protect a receiver like the IC706 when using a BIG antenna as the MF receive antenna. It will be easy to build a passive circuit out of a transformer 50 Ohm -> 18 kOhm -->Filter--> 18 kOhm -> 50 Ohm. This can be put in a small box and then there will be no problems! I remember how the 706 and others behave on long wires, i.e. multi-band antennas... [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 8ac9f0a1bced50a7ada6578ede3fb6ae Subject: Re: LF: RE: Fwd: Help needed, mechanical filters Content-Type: multipart/alternative; boundary="------------030508080900060300070700" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_30_40,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,HTML_TAG_EXISTS_TBODY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:486581504:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60da4fee24ad0c55 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------030508080900060300070700 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q5TLuADc028342 MF, It becomes better! I just realised that this filter is perfect to protect a receiver like=20 the IC706 when using a BIG antenna as the MF receive antenna. It will be=20 easy to build a passive circuit out of a transformer 50 Ohm -> 18 kOhm=20 -->Filter--> 18 kOhm -> 50 Ohm. This can be put in a small box and then=20 there will be no problems! I remember how the 706 and others behave on=20 long wires, i.e. multi-band antennas... 73, Stefan Am 29.06.2012 23:03, schrieb Mike: > Stefan > Have you included the 300pF capacitor (I do not read German) and not=20 > sure if it is the same on both ends? > I would expect the launch circuit needs a cap both ends. > Mike G3JVL > > -----Original Message----- > *From:* owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org]*On Behalf Of *Stefan > Sch=E4fer > *Sent:* 29 June 2012 21:27 > *To:* rsgb_lf_group@blacksheep.org > *Subject:* LF: Fwd: Help needed, mechanical filters > > 4th try... > > -------- Original-Nachricht -------- > Betreff: Help needed, mechanical filters > Datum: Fri, 29 Jun 2012 20:58:41 +0200 > Von: Stefan Sch=E4fer > An: rsgb_lf_group@blacksheep.org > > > > MF, > > I have bought a mechanical filter which has a center frequency of 4= 73 > kHz. It is available at > http://www.oppermann-electronic.de/html/body_hf-spezialbauteile.htm= l > (scroll down to FZ 01 / FZ 02). I have both types and just measured= the > frequency response. There is a data sheet as well which states the > impedances to be connected to the wires. > There is even a datasheet at > http://www.oppermann-electronic.de/assets/applets/FZ_01.pdf > > All in all it looks very interesting and the slopes are really very > sharp. However there is a passband ripple of 10 dB which is very ve= ry > high. See the image: > https://dl.dropbox.com/u/19882028/MF/Mechanisches%20Filter%20473%20= kHz.png > > So what have i done wrong? Or is it that bad? > > The input signal is connected on the left side between the red and = green > wire. The output signal is taken from the right side on the red and > green wire too. It looks as if each side has a coil on the green an= d red > wire, with a tap at the yellow wire. > Helpful was this image from the web > http://www.amateurfunkmuseum.de/AFM_321b-Dateien/image006.jpg whic= h > shows a similar filter. I have connected a resistor of 18 kOhm to t= he > output and a 500 Ohm resistor in series to the signal generator, as > stated in the datasheet. But the ripple does not change. > > Any ideas or suggestions? > > Guess for what i will need the filter! :-) > > 73, Stefan/DK7FC > =20 > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.930 / Virus Database: 2433.1.1/5098 - Release Date: > 06/29/12 07:34:00 > --------------030508080900060300070700 Content-Type: text/html; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q5TLuADc028342 MF,

It becomes better!

I just realised that this filter is perfect to protect a receiver like the IC706 when using a BIG antenna as the MF receive antenna. It will be easy to build a passive circuit out of a transformer 50 Ohm -> 18 kOhm -->Filter--> 18 kOhm -> 50 Ohm. This can be put in a small box and then there will be no problems! I remember how the 706 and others behave on long wires, i.e. multi-band antennas...

73, Stefan

Am 29.06.2012 23:03, schrieb Mike:
Stefan
Have you included the 300pF capacitor (I do no= t read German) and not sure if it is the same on both ends?
I would expect the launch circuit needs a cap both ends.
Mike G3JVL
-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf = Of Stefan Sch=E4fer
Sent: 29 June 2012 21:27
To: rsgb_lf_group@blacksheep.org
Subject: LF: Fwd: Help needed, mechanical filters

4th try...

-------- Original-Nachricht --------
Betre= ff: Help needed, mechanical filters
Datum= : Fri, 29 Jun 2012 20:58:41 +0200
Von: = Stefan Sch=E4fer <schaefer@iup.uni-heid= elberg.de>
An: <= /th> rsgb_lf_group@blacksheep.or= g 


MF,

I have bought a mechanical filter which has a center frequency of 473=20
kHz. It is available at=20
http://www.oppermann-electronic.de/html/body_hf-spezialbauteile.htm=
l=20
(scroll down to FZ 01 / FZ 02). I have both types and just measured the=20
frequency response. There is a data sheet as well which states the=20
impedances to be connected to the wires.
There is even a datasheet at=20
htt=
p://www.oppermann-electronic.de/assets/applets/FZ_01.pdf

All in all it looks very interesting and the slopes are really very=20
sharp. However there is a passband ripple of 10 dB which is very very=20
high. See the image:=20
https://dl.dropbox.com/u/19882028/MF/Mechanisches%20Filter%20=
473%20kHz.png

So what have i done wrong?  Or is it that bad?

The input signal is connected on the left side between the red and green=20
wire. The output signal is taken from the right side on the red and=20
green wire too. It looks as if each side has a coil on the green and red=20
wire, with a tap at the yellow wire.
Helpful was this image from the web=20
h=
ttp://www.amateurfunkmuseum.de/AFM_321b-Dateien/image006.jpg which=20
shows a similar filter. I have connected a resistor of 18 kOhm to the=20
output and a 500 Ohm resistor in series to the signal generator, as=20
stated in the datasheet. But the ripple does not change.

Any ideas or suggestions?

Guess for what i will need the filter! :-)

73, Stefan/DK7FC

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.930 / Virus Database: 2433.1.1/5098 - Release Date: 06/29/12 07:34:00

--------------030508080900060300070700--