Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3DB3A380000A1; Fri, 29 Jun 2012 17:17:52 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SkiYn-0003E9-0t for rs_out_1@blacksheep.org; Fri, 29 Jun 2012 22:17:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SkiYm-0003E0-BK for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:17:00 +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 1SkiYk-0000MG-7d for rsgb_lf_group@blacksheep.org; Fri, 29 Jun 2012 22:16:59 +0100 Received: from AGB ([2.26.45.202]) by mwinf5d41 with ME id UMGu1j0084MjVGq03MGuF4; Fri, 29 Jun 2012 23:16:57 +0200 Message-ID: <5DCDBF0ADD564CB1947F77646CFA5ECE@AGB> From: "Graham" To: References: <4FEE0F7E.2090109@iup.uni-heidelberg.de> In-Reply-To: <4FEE0F7E.2090109@iup.uni-heidelberg.de> Date: Fri, 29 Jun 2012 22:16:53 +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: Is that series or parallel |Z| ? Also will need the correct parallel capacitance valve cct shows the anode amps passing via the filter ? odd ? but if its for this kind of service , then the |Z| is referring to anode load values , which are not 'real' but complex [...] 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: 6ae5fe68d6708d1e4a9cbdf0f0af43e5 Subject: Re: LF: Fwd: Help needed, mechanical filters Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01CD5644.E3754250" 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_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: 0:2:507613632:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db40a4fee1b800707 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_0014_01CD5644.E3754250 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Is that series or parallel |Z| ? Also will need the correct = parallel capacitance=20 valve cct shows the anode amps passing via the filter ? odd ? = but if its for this kind of service , then the |Z| is referring = to anode load values , which are not 'real' but complex=20 Data sheet , cannot read, say load termination |Z| or = terminate with Ohms ?=20 G..=20 From: Stefan Sch=E4fer=20 Sent: Friday, June 29, 2012 9:26 PM To: rsgb_lf_group@blacksheep.org=20 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 ------=_NextPart_000_0014_01CD5644.E3754250 Content-Type: text/html; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable
Is  that  series  or  parallel  |Z|  = ? =20 Also  will  need  the  correct  = parallel  =20 capacitance
 
valve  cct  shows  the  anode  amps =20 passing  via  the filter  ?  odd  ? but if = its =20 for  this  kind of  service , then  the  |Z| = is =20 referring  to  anode  load  values , which are  = not   'real'  but  complex
 
Data  sheet , cannot  read,    say =20 load  termination  |Z| or   terminate  = with  Ohms=20 ?
 
G.. 
 
 

From: Stefan = Sch=E4fer
Sent: Friday, June 29, 2012 9:26 PM
Subject: LF: Fwd: Help needed, mechanical = filters

4th try...

-------- Original-Nachricht --------=20
Betreff: Help needed, mechanical filters
Datum: Fri, 29 Jun 2012 20:58:41 +0200
Von: Stefan Sch=E4fer CTRL + Click = to follow link"=20 = href=3D"mailto:schaefer@iup.uni-heidelberg.de>"><schaefer@iup.uni-heid= elberg.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
------=_NextPart_000_0014_01CD5644.E3754250--