Return-Path: Received: from mtain-db11.r1000.mx.aol.com (mtain-db11.r1000.mx.aol.com [172.29.64.95]) by air-mb04.mail.aol.com (v126.13) with ESMTP id MAILINMB042-a26e4b4f209a139; Thu, 14 Jan 2010 08:48:10 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 93C8F380000ED; Thu, 14 Jan 2010 08:48:07 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NVQ1d-0008B2-6o for rs_out_1@blacksheep.org; Thu, 14 Jan 2010 13:46:13 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NVQ1b-0008At-I2 for rsgb_lf_group@blacksheep.org; Thu, 14 Jan 2010 13:46:11 +0000 Received: from mail-bw0-f221.google.com ([209.85.218.221]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NVQ1X-00035A-FO for rsgb_lf_group@blacksheep.org; Thu, 14 Jan 2010 13:46:10 +0000 Received: by bwz21 with SMTP id 21so16524469bwz.4 for ; Thu, 14 Jan 2010 05:46:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=BNqtcwz3gz0+ri9y54s+q0rLifeBvvrGlC0no3Z9jVo=; b=oy1o5jNlzvDmcpU4wA3QgoIQ/6rSAY+4zz9c/IBoUeAr6CXAKAppHFRY8WlDO7cstZ Cxkb0uMCoKillxkST3MUMFjC/SG5++WLoR/Bsf7aW78TJskvfcBnHl2FXTOIdooFZ8hw hKKUkYBxDxOzMJlCadmPN4VjnzXlbkoNuZlNs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=himO7sE3i7H45HCzAIuOJkUpBYJr0N5Coj4TLko5wLflNDX9za264tCUqPerfnO0Uk P3Dek/5mR+sa0M9wJr1KgVtLciwZHnmhP6aXFYcgPH6SzCc1W5xOE+sIVJrVAaTLrngI jeQuYD/OuOixxxKc/zbWSZHTtlQt6f/llDnQQ= MIME-Version: 1.0 Received: by 10.204.8.3 with SMTP id f3mr453908bkf.140.1263476761720; Thu, 14 Jan 2010 05:46:01 -0800 (PST) In-Reply-To: References: <1f0624b91001131347i18ff85bbxb5977cdcb3c438f5@mail.gmail.com> <20100113220536.23ff9c6e@opc1> <20100113232415.j3jn4brkyqs4gg0s@webmail6.kuleuven.be> <1f0624b91001140306k7eff5b4cn9ae73cb5cc6a37fc@mail.gmail.com> <9afca2641001140408o9e58f8g36272480eb115958@mail.gmail.com> Date: Thu, 14 Jan 2010 13:46:01 +0000 Message-ID: <9afca2641001140546v61772ef5mbb0fa9510db5eba@mail.gmail.com> From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: 500khz WSPR drift Content-Type: multipart/alternative; boundary=0015174bec609082f0047d201bf6 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30, HTML_FONTCOLOR_UNSAFE,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 x-aol-global-disposition: G x-aol-sid: 3039ac1d405f4b4f20974786 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --0015174bec609082f0047d201bf6 Content-Type: text/plain; charset=ISO-8859-1 You mean derive it from the *transceiver's* master oscilllator. Yes, a good idea, but the MO is not available on an unmodified FT817 but may well be on "grown up" radios. 73s Roger G3XBM 2010/1/14 Andy Talbot > If you are able to derive the transverter LO from the transverter's master > oscillator do so. That way errors will be cancelled out and any > frequency drift will be now be in direct proportion to the final output > frequency, rather than being that associated with any arbitrarily high IF. > > Just an example: > The master oscillator in the IC746 is at 30MHz, so transverting from > 30.5MHz would be an option in this case. But one could just as easily > divide this by 2 first and transvert from 15.5MHz. > > Andy > www.g4jnt.com > > This email has been scanned for damaging side-effects by the health and > safety police, is guaranteed to contain no substances hazardous to health, > but may contribute to dissolving the nether and polar regions > > > 2010/1/14 Roger Lapthorn > > My own QRP transverter goes from 28MHz down to 500kHz and this drifts about >> 40Hz before settling as the oscillator warms, so I have to be on-hand to >> adjust the dial setting in the first 30 minutes. I should leave the >> oscillator running all the time or have this on for 30 minutes before I >> start TXing. >> >> At 50MHz drift would be worse. Also, I'm not sure what ambient temperature >> LA3EQ has got, but I bet it is cold, so his drift might be even greater as >> his transverter (higher power than mine) warms up more over a larger >> temperature range. >> >> 73s >> Roger G3XBM >> >> 2010/1/14 Gary - G4WGT >> >> Hi guys, >>> >>> Yes it was LA3EQ, started getting decodes as the drift flattened out. 50 >>> MHz to 500 kHz is a long way to transvert, I use 4 MHz & as far as I am >>> aware no drift problems after half an hour or so warm up. >>> >>> Thanks all the comments. >>> >>> Gary - G4WGT. >>> >>> 2010/1/13 James Moritz >>> >>> Dear LF Group, >>>> >>>> ...The perils of having a 50MHz -> 500kHz transverter! 3.5MHz would be a >>>> better IF frequency from the drift point of view. >>>> >>>> Cheers, Jim Moritz >>>> 73 de M0BMU >>>> >>>> ----- Original Message ----- From: "Rik Strobbe" < >>>> Rik.Strobbe@fys.kuleuven.be> >>>> To: >>>> Sent: Wednesday, January 13, 2010 10:24 PM >>>> Subject: Re: LF: 500khz WSPR drift >>>> >>>> >>>> >>>> over the past 12 hours I had 51 spots of LA3EQ, frequency ranging from >>>>> 503848 to 503885 >>>>> >>>>> 73, Rik >>>>> >>>> >>>> >>>> >>> >> >> >> -- >> >> http://g3xbm-qrp.blogspot.com/ >> http://www.g3xbm.co.uk >> http://www.youtube.com/user/G3XBM >> G3XBM GQRP 1678 ISWL G11088 >> > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 --0015174bec609082f0047d201bf6 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable You mean derive it from the transceiver's master oscilllator.= Yes, a good idea, but the MO is not available on an unmodified FT817 but= may well be on "grown up" radios.

73s
Roger G3XBM
=
2010/1/14 Andy Talbot <andy.g4jnt@googlemail.com&g= t;
If you are able to derive the transverter LO from the transverter'= ;s master oscillator do so.=A0 That way=A0errors will be cancelled out and= =A0any frequency=A0drift will be now be in direct proportion to the final= output frequency, rather than being that associated with any arbitrarily= high IF.
=A0
Just an example:
The master oscillator in the IC746 is at 30MHz, so transverting from= 30.5MHz would be an option in this case.=A0 But one could just as easily= divide this by 2 first and transvert from 15.5MHz.
=A0
Andy
www.g4jnt.= com

This email has been scanned for damaging side-effects by th= e health and safety police, is guaranteed to contain no substances hazardo= us to health, but may contribute to dissolving the nether and polar region= s


2010/1/14 Roger Lapthorn <= rogerlapthorn= @gmail.com>

My own QRP tran= sverter goes from 28MHz down to 500kHz and this drifts about 40Hz before= settling as the oscillator warms, so I have to be on-hand to adjust the= dial setting in the first 30 minutes. I should leave the oscillator runni= ng all the time or have this on for 30 minutes before I start TXing.

At 50MHz drift would be worse. Also, I'm not sure what ambient tem= perature LA3EQ has got, but I bet it is cold, so his drift might be even= greater as his transverter (higher power than mine) warms up more over a= larger temperature range.

73s
Roger G3XBM

2010/1/14 Gary - G4WGT <g4wgt@tiscali.co.uk= >=20

Hi guys,=20

Yes it was LA3EQ, =A0started getting decodes as the drift flattened= out. 50 MHz to 500 kHz is a long way to transvert, I use 4 MHz & as= far as I am aware no drift problems after half an hour or so warm up.

Thanks all the comments.

Gary - G4WGT.

2010/1/13 James Moritz <james.mori= tz@btopenworld.com>=20

Dear LF Group,<= br>
...The perils of having a 50MHz -> 500kHz transverter! 3.5MHz wo= uld be a better IF frequency from the drift point of view.

Cheers, Jim Moritz
73 de M0BMU

----- Original Message -----= From: "Rik Strobbe" <Rik.Strobbe@fys.kuleuven.be>
To: <<= a href=3D"mailto:rsgb_lf_group@blacksheep.org" target=3D"_blank">rsgb_lf_g= roup@blacksheep.org>
Sent: Wednesday, January 13, 2010 10:24 PM
Subject: Re: LF: 500khz WSPR= drift=20



over the past= 12 hours I had 51 spots of LA3EQ, frequency ranging from 503848 to 503885=

73, Rik





--

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.= uk
= http://www.youtube.com/user/G3XBM
G3XBM =A0 =A0GQRP 1678 =A0 =A0 = =A0ISWL G11088




--

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/G3XBM
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
--0015174bec609082f0047d201bf6--