X-GM-THRID: 1223284245938580515 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.70.56.11 with SMTP id e11cs124390wxa; Wed, 20 Dec 2006 03:39:27 -0800 (PST) Received: by 10.78.187.17 with SMTP id k17mr4646910huf.1166614767189; Wed, 20 Dec 2006 03:39:27 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 24si9755045huf.2006.12.20.03.38.46; Wed, 20 Dec 2006 03:39:27 -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 1Gwzfi-0000NF-G9 for rs_out_1@blacksheep.org; Wed, 20 Dec 2006 11:31:42 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Gwzfh-0000N6-V3 for rsgb_lf_group@blacksheep.org; Wed, 20 Dec 2006 11:31:41 +0000 Received: from smtprelay01.ispgateway.de ([80.67.18.13]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Gwzfe-0008Va-Ei for rsgb_lf_group@blacksheep.org; Wed, 20 Dec 2006 11:31:41 +0000 Received: (qmail 12938 invoked from network); 20 Dec 2006 11:31:35 -0000 Received: from unknown (HELO flohxp) (922989@[84.176.225.148]) (envelope-sender ) by smtprelay01.ispgateway.de (qmail-ldap-1.03) with SMTP for ; 20 Dec 2006 11:31:35 -0000 Message-ID: <008801c72432$30cf5f90$65a4a8c0@flohxp> From: "Stephan Hans" To: References: Date: Wed, 20 Dec 2006 12:27:17 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: RE: Re: EA4BVZ MC Content-Type: multipart/alternative; boundary="----=_NextPart_000_0085_01C72432.2FAEFB70" 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: 3320 This is a multi-part message in MIME format. ------=_NextPart_000_0085_01C72432.2FAEFB70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Manuel Santos=20 To: rsgb_lf_group@blacksheep.org=20 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. =20 Many Thans Stephan EA4BVZ I will have a look at 136321 Hz tonight. Greetings from DL3FCH, Stephan ------=_NextPart_000_0085_01C72432.2FAEFB70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello Manuel,
 
sorry, nothing here at locator JO40KA last night. I grabbed the = whole night=20 the range from 136317 to 136325 Hz with DL4YHF's Spectrum Lab, but I got = only=20 noise. Not even traces from your signal :-(.
 
Last week (10.12.06), I received PE1RRF at the same frequency with = a nearly=20 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 the=20 design of Jean-Pierre's rx, but without bandpass filter. So I receive = the mirror=20 frequencies (like 133679 in your case) as good as the desired = frequencies...=20 which is not a big problem (there's not much here from 132 to 134kHz) = but at=20 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 = amplification,=20 the output of the mixer is going to be clipped due to the = 128.830 kHz=20 of DCF49 (which produces nasty distortions all over the band).
I experimented with several bandpass filters to suppress the = undesired DCF=20 signals, but all my filter approaches produced additional noise that = wastes the=20 gain of selectivity. I even tried an nf-peak filter between the output = stage=20 (low pass with small amplification) and my PC's soundcard, but I = only got=20 more noise instead of sensitivity.
 
So I'm now designing a new rx, around a very good 1.4MHz = ssb-crystal filter=20 (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 Santos=20
Sent: Tuesday, December 19, = 2006 10:16=20 AM
Subject: LF: RE: Re: EA4BVZ = MC

 
 
 
At wich speed/mode are = you going to=20 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_0085_01C72432.2FAEFB70--