Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5DB873800009A; Sun, 3 Feb 2013 16:37:51 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1U27F8-0003YZ-Em for rs_out_1@blacksheep.org; Sun, 03 Feb 2013 21:36:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1U27F7-0003YQ-Se for rsgb_lf_group@blacksheep.org; Sun, 03 Feb 2013 21:36:53 +0000 Received: from mail-qa0-f43.google.com ([209.85.216.43]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1U27F5-0001TZ-7c for rsgb_lf_group@blacksheep.org; Sun, 03 Feb 2013 21:36:52 +0000 Received: by mail-qa0-f43.google.com with SMTP id dx4so1020266qab.9 for ; Sun, 03 Feb 2013 13:36:29 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=0zN2B2N2hsDAujZerZJ5y3zApjnur92q6M16nT38CrY=; b=fp1FzDh97qZW3yvHQTR77eJbUw5kymSF10G4aHoG+lKjbiU3jV8jg27T/dcuoR5+kt DmaFz30CtlB/iUB/ffTBn3UMwhw23SKQfl89DBOzLkZH9HZZ/wO2cBZydX359TOSbGBc j6GTj7APZ83EWpNB3vKPilcsRzmIfRnFoJa1YXJ/sLaEld03ijNEbTpXH8NLOLnNvuBl O2MZJNflvA97E9bCvU07YHpJK5FFBpXoh6bBWiSJcrG3nFC0eSBldp0BluIDlrFK7Yi5 SEbJ7wiG9/Z21NF9E7K59zeJ/ixIGtHd3k3tcGzrUsHRMbUIT9saQThFs9UGV3CLLNNs TykA== MIME-Version: 1.0 X-Received: by 10.229.179.32 with SMTP id bo32mr4240757qcb.6.1359927389350; Sun, 03 Feb 2013 13:36:29 -0800 (PST) Received: by 10.229.201.228 with HTTP; Sun, 3 Feb 2013 13:36:29 -0800 (PST) In-Reply-To: <510ED2F0.1030001@iup.uni-heidelberg.de> References: <510ED2F0.1030001@iup.uni-heidelberg.de> Date: Sun, 3 Feb 2013 21:36:29 +0000 Message-ID: From: Roger Lapthorn To: "rsgb_lf_group@blacksheep.org" 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: No problems on RX Stefan, just on TX using the FT817 (at 1836kHz) with a transverter. On RX I use the FT817 directly on LF with a preamp and stability no issue. 73s Roger On 3 February 2013 21:13, Stefan Schäfer < wrote: [...] 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 [209.85.216.43 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rogerlapthorn[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: eb65b97b00a71049be1fa526941c7b31 Subject: Re: LF: 817 drift Content-Type: multipart/alternative; boundary=005045015d9df66cf904d4d8c4b2 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, TO_ADDRESS_EQ_REAL 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-AUTHENTICATION: mtain-mc05.r1000.mx.aol.com ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d604d510ed8af4cf1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --005045015d9df66cf904d4d8c4b2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable No problems on RX Stefan, just on TX using the FT817 (at 1836kHz) with a transverter. On RX I use the FT817 directly on LF with a preamp and stability no issue. 73s Roger On 3 February 2013 21:13, Stefan Sch=E4fer < Stefan.Schaefer@iup.uni-heidelberg.de> wrote: > ** > The best is not to use a HF TRX for the MF/LF stuff but to use a simple > downconverter, at least for the TX side. A simple NE612 mixer and a xtal > (e.g. 1.8432 MHz / 4 by using a CD4013) and a reasonable filter is what i= 'm > using here. Takes 50 mA (ish) at 12V, is compact, is stable, is cheap, is > /p... > > 73, Stefan/DK7FC > > Am 03.02.2013 21:38, schrieb Roger Lapthorn: > > Thanks for the tip Lawrence. I will try a lower supply voltage first. > > 73s > Roger G3XBM > > > On 3 February 2013 19:45, Laurence KL1 X = wrote: > >> Roger - I had the same drift issue and added the txco with little >> improvement - best was when unit was powered driven by lower voltage - >> think mine is set around 9.6V at the moment and less heat..it also sits = in >> the cool garage...think Dex also found the same >> >> Laurence KL 1 X >> >> ------------------------------ >> Date: Sun, 3 Feb 2013 19:23:35 +0000 >> From: rogerlapthorn@gmail.com >> To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk >> Subject: LF: WSPR15 - sort of success >> >> After several attempts Tom G8HUH managed to decode my WSPR15 >> transmission on 137.607kHz this evening. As the FT817 was drifting aroun= d >> 4Hz in the 15 minute TX slot with the FT817 on 1837.607kHz (I was using = a >> stabilised sig gen for the LO at 1.7MHz), I think this was messing up th= e >> decodes as Tom only gave me -32 and -34dB S/N whereas I have been gettin= g >> some 6dB BETTER than this with the WSPR2 transmissions. >> >> If WSPR15 is going to succeed for me I need a more stable rig (or a >> 0.5ppm TXCO fitted to the FT817) or a fan to force cool the FT817 - even >> when running 500mW! >> >> I'll leave the rig on for a little while longer, but will probably >> revert to WSPR2 for the rest of the evening. >> >> Thank you Tom G8HUH, and Trevor G0KTN, for working with me for the last >> couple of hours to get this as good as I could. >> >> 73s >> Roger G3XBM >> > > --=20 http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk https://sites.google.com/site/sub9khz/ http://qss2.blogspot.com/ http://www.youtube.com/user/G3XBM --005045015d9df66cf904d4d8c4b2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
No problems on RX Stefan, just on TX using the FT817 (at 1= 836kHz) with a transverter. On RX I use the FT817 directly on LF with a pre= amp and stability no issue.

73s
Ro= ger


On 3 Fe= bruary 2013 21:13, Stefan Sch=E4fer <Stefan.Schaefer@i= up.uni-heidelberg.de> wrote:
=20
The best is not to use a HF TRX for the MF/LF stuff but to use a simple downconverter, at least for the TX side. A simple NE612 mixer and a xtal (e.g. 1.8432 MHz / 4 by using a CD4013) and a reasonable filter is what i'm using here. Takes 50 mA (ish) at 12V, is compact, is stable, is cheap, is /p...

73, Stefan/DK7FC

Am 03.02.2013 21:38, schrieb Roger Lapthorn:
Thanks for the tip Lawrence. I will try a lower supply voltage first.

73s
Roger G3XBM


On 3 February 2013 19:45, Laurence KL1 X <hellozerohellozero@hotmail.com> wrote:
Roger - I had the same drift issue and added the txco with little improvement - best was when unit was powered driven by lower voltage - think mine is set around 9.6V at the moment and less heat..it also sits in the cool garage...think Dex also found the same

Laurence KL 1 X

Date: Sun, 3 Feb 2013 19:23:35 +0000
From: rogerlap= thorn@gmail.com
To: rsgb_= lf_group@blacksheep.org; rs= gb_lf_group@yahoogroups.co.uk
Subject: LF: WSPR15 - sort of success

After several attempts Tom G8HUH managed to decode my WSPR15 transmission on 137.607kHz this evening. As the FT817 was drifting around 4Hz in the 15 minute TX slot with the FT817 on 1837.607kHz (I was using a stabilised sig gen for the LO at 1.7MHz), I think this was messing up the decodes as Tom only gave me -32 and -34dB S/N whereas I have been getting some 6dB BETTER than this with the WSPR2 transmissions.

If WSPR15 is going to succeed for me I need a more stable rig (or a 0.5ppm TXCO fitted to the FT817) or a fan to force cool the FT817 - even when running 500mW!

I'll leave the rig on for a little while longer, but will probably revert to WSPR2 for the rest of the evening.

Thank you Tom G8HUH, and Trevor G0KTN, for working with me for the last couple of hours to get this as good as I could.

73s
Roger G3XBM




--
--005045015d9df66cf904d4d8c4b2--