X-GM-THRID: 1223287003342030128 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.70.56.11 with SMTP id e11cs128206wxa; Wed, 20 Dec 2006 04:23:19 -0800 (PST) Received: by 10.78.185.15 with SMTP id i15mr5074187huf.1166617398504; Wed, 20 Dec 2006 04:23:18 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 30si11214641hue.2006.12.20.04.23.14; Wed, 20 Dec 2006 04:23:18 -0800 (PST) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Gx0Mb-0000ap-Pq for rs_out_1@blacksheep.org; Wed, 20 Dec 2006 12:16:01 +0000 Received: from [193.82.116.35] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Gx0Mb-0000ag-8l for rsgb_lf_group@blacksheep.org; Wed, 20 Dec 2006 12:16:01 +0000 Received: from correo14.acens.net ([217.116.0.88]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Gx0MX-0001Ex-KN for rsgb_lf_group@blacksheep.org; Wed, 20 Dec 2006 12:16:01 +0000 Received: (qmail 30067 invoked from network); 20 Dec 2006 12:15:48 -0000 Received: from unknown (HELO DESPACHO) ([88.0.68.10]) (envelope-sender ) by correo14.acens.net (qmail-ldap-1.03) with SMTP for ; 20 Dec 2006 12:15:48 -0000 From: "Manuel Santos" To: Date: Wed, 20 Dec 2006 13:15:55 +0100 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: <008801c72432$30cf5f90$65a4a8c0@flohxp> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: EA4BVZ Content-Type: multipart/alternative; boundary="----=_NextPart_000_0028_01C72438.FB77F620" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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 Status: O X-Status: X-Keywords: X-UID: 5361 This is a multi-part message in MIME format. ------=_NextPart_000_0028_01C72438.FB77F620 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit Hallo friend Stephan: To be so near of the DCF is a very strong handicap. I have received a very good report of Paris and my signs was received also in the Grabber of DF6NM. For the next year I will put more power and your another banspass filter. Happy Christmas and Good 2007 EA4BVZ -----Mensaje original----- De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]En nombre de Stephan Hans Enviado el: mi�rcoles, 20 de diciembre de 2006 13:27 Para: rsgb_lf_group@blacksheep.org Asunto: LF: Re: RE: Re: EA4BVZ MC Hello Manuel, sorry, nothing here at locator JO40KA last night. I grabbed the whole night the range from 136317 to 136325 Hz with DL4YHF's Spectrum Lab, but I got only noise. Not even traces from your signal :-(. Last week (10.12.06), I received PE1RRF at the same frequency with a nearly perfect signal. You may have read my answer here at the group. Anyway, I've to admit that my actual rx isn't very sensitive. I've an passive low pass (edge frequency approx. 140khz) with 20dB amp in the next stage. This signal is then going to be mixed through a symmetric transformator with an CD4016 and TCXO controlled 135khz down into the baseband. Similar to the design of Jean-Pierre's rx, but without bandpass filter. So I receive the mirror frequencies (like 133679 in your case) as good as the desired frequencies... which is not a big problem (there's not much here from 132 to 134kHz) but at least a waste of 3dB sensitivity. But the real problem with this approach is, that I'm located approx. 4 wavelengths from Mainflingen / DCF49, so if I increase the amplification, the output of the mixer is going to be clipped due to the 128.830 kHz of DCF49 (which produces nasty distortions all over the band). I experimented with several bandpass filters to suppress the undesired DCF signals, but all my filter approaches produced additional noise that wastes the gain of selectivity. I even tried an nf-peak filter between the output stage (low pass with small amplification) and my PC's soundcard, but I only got more noise instead of sensitivity. So I'm now designing a new rx, around a very good 1.4MHz ssb-crystal filter (from a commercial marine rx), which will use two (TCXO controlled) DDS synthesizers. Then I'm going to get rid of DCF49 and even DCF39 (which still has a very strong signal here). vy 73 to you and the group de DL3FCH ----- Original Message ----- From: Manuel Santos To: rsgb_lf_group@blacksheep.org Sent: Tuesday, December 19, 2006 10:16 AM Subject: LF: RE: Re: EA4BVZ MC At wich speed/mode are you going to transmit, QRSS3/10/30/60 ? At QRSS 60. Many Thans Stephan EA4BVZ I will have a look at 136321 Hz tonight. Greetings from DL3FCH, Stephan ------=_NextPart_000_0028_01C72438.FB77F620 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hallo friend = Stephan:
 
To be so near of the DCF is a very strong handicap. I have received = a very=20 good report of Paris and my signs was received also in the Grabber of=20 DF6NM.
 
For the next year I will put more power and your another banspass=20 filter.
 
Happy Christmas and Good 2007=20
EA4BVZ
-----Mensaje original-----
De:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]En nombre de Stephan = Hans
Enviado el: mi=E9rcoles, 20 de diciembre de 2006=20 13:27
Para: rsgb_lf_group@blacksheep.org
Asunto: = LF: Re:=20 RE: Re: EA4BVZ MC

Hello Manuel,
 
sorry, nothing here at locator JO40KA last night. I grabbed the = whole=20 night the range from 136317 to 136325 Hz with DL4YHF's Spectrum Lab, = but I got=20 only noise. Not even traces from your signal :-(.
 
Last week (10.12.06), I received PE1RRF at the same frequency = with a=20 nearly perfect signal. You may have read my answer here at the = group.
 
Anyway, I've to admit that my actual rx isn't very sensitive. = I've an=20 passive low pass (edge frequency approx. 140khz) with 20dB amp in the = next=20 stage. This signal is then going to be mixed through a symmetric = transformator=20 with an CD4016 and TCXO controlled 135khz down into the baseband. = Similar to=20 the design of Jean-Pierre's rx, but without bandpass filter. So I = receive the=20 mirror frequencies (like 133679 in your case) as good as the desired=20 frequencies... which is not a big problem (there's not much here from = 132 to=20 134kHz) but at least a waste of 3dB sensitivity.
 
But the real problem with this approach is, that I'm located = approx.=20 4 wavelengths from Mainflingen / DCF49, so if I increase the=20 amplification, the output of the mixer is going to be = clipped due to=20 the 128.830 kHz of DCF49 (which produces nasty distortions all over = the=20 band).
I experimented with several bandpass filters to suppress the = undesired=20 DCF signals, but all my filter approaches produced additional noise = that=20 wastes the gain of selectivity. I even tried an nf-peak filter between = the=20 output stage (low pass with small amplification) and my PC's = soundcard, but I=20 only got more noise instead of sensitivity.
 
So I'm now designing a new rx, around a very good 1.4MHz = ssb-crystal=20 filter (from a commercial marine rx), which will use two (TCXO=20 controlled) DDS synthesizers. Then I'm going to get rid of DCF49 = and even=20 DCF39 (which still has a very strong signal here).
 
vy 73 to you and the group de DL3FCH
 
----- Original Message -----
From:=20 Manuel=20 Santos
To: rsgb_lf_group@blacksheep.org= =20
Sent: Tuesday, December 19, = 2006 10:16=20 AM
Subject: LF: RE: Re: EA4BVZ = MC

 
 
 
At wich speed/mode are = you going=20 to transmit, QRSS3/10/30/60 ?
 
At QRSS 60.  =
 
Many Thans = Stephan
 
EA4BVZ
 
 
I will have a look at 136321 Hz tonight.
 
Greetings from DL3FCH, Stephan
 
<= /BODY> ------=_NextPart_000_0028_01C72438.FB77F620--