Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5BCD138000092; Fri, 29 Jun 2012 17:24:09 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Skiex-0003LB-Is for rs_out_1@blacksheep.org; Fri, 29 Jun 2012 22:23:23 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Skiex-0003L2-0i for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:23:23 +0100 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Skieu-0000QH-9b for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:23:21 +0100 Received: from AGB ([2.26.45.202]) by mwinf5d41 with ME id UMPK1j0094MjVGq03MPKr3; Fri, 29 Jun 2012 23:23:19 +0200 Message-ID: <86E82E780CF0405BB85C38C665DF38B0@AGB> From: "Graham" To: References: <00a901cd563a$b02b6be0$0200a8c0@boxa> In-Reply-To: <00a901cd563a$b02b6be0$0200a8c0@boxa> Date: Fri, 29 Jun 2012 22:23:19 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 120629-2, 29/06/2012), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.0 (/) 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: Yes an exciting game of 'Techno-Guess' HiHi What is the stated pass band ripple ? Is that plot 3 dB / 50% or 6 dB ? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: e2b7e65dcf7cf6551ab81105a525fe0f Subject: Re: LF: RE: Fwd: Help needed, mechanical filters Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01CD5645.C947CAF0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_30_40,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,HTML_TAG_EXISTS_TBODY,MISSING_OUTLOOK_NAME 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: 0:2:514819168:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d608a4fee1cf9705c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_003F_01CD5645.C947CAF0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Yes an exciting game of 'Techno-Guess' HiHi What is the stated pass band ripple ?=20 Is that plot 3 dB / 50% or 6 dB ?=20 Should there be a standing mA feed ? which may dampen the = device a bit , stop it wringing ? From: Mike=20 Sent: Friday, June 29, 2012 10:03 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: RE: Fwd: Help needed, mechanical filters Stefan=20 Have you included the 300pF capacitor (I do not 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...=20 -------- Original-Nachricht -------- Betreff: Help needed, mechanical = filters=20 Datum: Fri, 29 Jun 2012 20:58:41 +0200=20 Von: Stefan Sch=E4fer =20 An: rsgb_lf_group@blacksheep.org=20 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.html=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 http://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%20473%20kHz.pn= g 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=20 green wire too. It looks as if each side has a coil on the green and red = wire, with a tap at the yellow wire. Helpful was this image from the web=20 http://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 ------=_NextPart_000_003F_01CD5645.C947CAF0 Content-Type: text/html; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable
Yes  an exciting  game  of  = 'Techno-Guess'  =20  HiHi
 
What  is the  stated  pass  band  = ripple  ?=20
 
Is that  plot   3 dB / 50% or   6 dB ? =
 
Should  there  be a  standing  mA  = feed  ?=20 which  may  dampen the  device  a  bit  ,=20 stop  it  wringing ?

From: Mike
Sent: Friday, June 29, 2012 10:03 PM
Subject: LF: RE: Fwd: Help needed, mechanical=20 filters

Stefan=20
Have=20 you included the 300pF capacitor (I do not read German) and not sure if = it is=20 the same on both ends?
I=20 would expect the launch circuit needs a cap both = ends.
Mike=20 G3JVL
-----Original Message-----
From: owner-rsgb_lf_group@bl= acksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Stefan=20 Sch=E4fer
Sent: 29 June 2012 21:27
To: rsgb_lf_group@blacksheep.org=
Subject:=20 LF: Fwd: Help needed, mechanical filters

4th = try...=20

-------- Original-Nachricht --------=20
Betreff: Help needed, mechanical filters
Datum: Fri, 29 Jun 2012 20:58:41 +0200
Von: Stefan Sch=E4fer <schaefer@iup.uni-heide= lberg.de>
An: rsgb_lf_group@blacksheep.org= 


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.html=
=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
http=
://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%204=
73%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 =

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 =

wire, with a tap at the yellow wire.
Helpful was this image from the web=20
ht=
tp://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=20 by AVG - www.avg.com
Version: 9.0.930 / Virus Database: = 2433.1.1/5098 -=20 Release Date: 06/29/12 = 07:34:00

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