Return-Path: Received: from rly-ma01.mx.aol.com (rly-ma01.mail.aol.com [172.20.116.44]) by air-ma02.mail.aol.com (v126.13) with ESMTP id MAILINMA023-8884b203283235; Wed, 09 Dec 2009 18:28:27 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-ma01.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMA012-8884b203283235; Wed, 09 Dec 2009 18:28:05 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NIVwE-0006Q6-S5 for rs_out_1@blacksheep.org; Wed, 09 Dec 2009 23:27:18 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NIVwE-0006Pv-3f for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2009 23:27:18 +0000 Received: from mail-bw0-f221.google.com ([209.85.218.221]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NIVwA-00049b-Sr for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2009 23:27:18 +0000 Received: by bwz21 with SMTP id 21so6088157bwz.4 for ; Wed, 09 Dec 2009 15:27:09 -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=tBrBkpGu3a16jPkYoCu8JD7867Fbf/isKNp9kkXQhCY=; b=HW5PV56t3ROEq+Y00t7ne7h7dfSx6pUXzAHsrpN+AgaMKpPIxOsyEctTXuAAeCwK3X cXW3oVu48izEk6hPfze/ZSz+lk5ywVZ05qyK6iNGtS+mPcf9ybM/UK0IhoRyHEN1qIPJ ewpH64N7Hha43s3RvpNSxtXbRrM0y1CFM2rcc= 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=k81nqyBCFHSGKS9+heacYYjxHlKxWkHYwvHwikR+jNx/GE8ipEchCfGGMfi/R9HG+q QKNlUxDt5wgzGJiH3xDfp8TYtpwRlploqE8paYPmmmElFvPHes6e6hY+f1cAXR8S+PxQ 2m8AfpZnI5B+bTFqM26M1QAhcZo4SPGIOpZzg= MIME-Version: 1.0 Received: by 10.204.152.154 with SMTP id g26mr2850990bkw.54.1260401229118; Wed, 09 Dec 2009 15:27:09 -0800 (PST) In-Reply-To: <20250.29213.qm@web86503.mail.ird.yahoo.com> References: <510B0611943F48E1975A8F833B63FBD5@AGB> <20250.29213.qm@web86503.mail.ird.yahoo.com> Date: Wed, 9 Dec 2009 23:27:09 +0000 Message-ID: <9afca2640912091527s766a7e64wa10ad3be7c7f6f08@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 simple 5W TX/RX transverter >>DATA MODES<< Content-Type: multipart/alternative; boundary=0015175d09de893e81047a54071c X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m230.2 ; domain : gmail.com DKIM : pass X-Mailer: Unknown (No Version) --0015175d09de893e81047a54071c Content-Type: text/plain; charset=ISO-8859-1 With the transverter "in the open" (rat's nest) on the desktop there is a warm-up drift of about 40Hz HF until things settle down. This has not been an issue with WSPR as the drift in a single TX slot is only about 1-2Hz usually (WSPR copes with this) and it soon settles down to 0Hz drift. I have not tried QRSS but imagine you'd have to ensure the xtal oscillator is made more thermally stable for v.slow QRSS, but would guess it would be OK for some moderate QRSS operation. Putting the whole unit in a box should help. My little circuit works, but is surely capable of much improvement, HI. 73s Roger G3XBM 2009/12/9 ALAN MELIA > Sounds good Roger and Graham... what it the stability like the problem with > transverters/upconverters normally is that while ok for some modes they are > often not stable enough for the very weak signal modes. These are modes > where you need to know the frequency of a station very accurately because > you will not hear it, or it will only pop above the noise for short periods. > > Alan G3NYK > > > --- On Wed, 9/12/09, Graham wrote: > > > From: Graham > > Subject: LF: 500kHz simple 5W TX/RX transverter >>DATA MODES<< > > To: rsgb_lf_group@blacksheep.org > > Date: Wednesday, 9 December, 2009, 22:13 > > > > > > > > > > > > > > > > All > > > > This latest > > addition to the > > HF / MF tx convertor opens the door > > to data > > communications on 500 ... ranging from > > 'all' the K1JT systems > > through to the single carrier > > multi tone > > systems of > > MFSK , DOMINO and THOR .. even > > the almost > > forgotten Amtor-arq and Packtor modes , anyone > > still have > > there pk232 > > > > listed are > > data modes that may be used with > > non-linear systems :- > > > > > > http://groups.google.com/group/uk500khz/web/meat-grinder-comms > > > > G.. > > > > > > > > > > From: Roger > > Lapthorn > > Sent: Tuesday, December 08, 2009 12:20 AM > > To: rsgb_lf_group@blacksheep.org > > > > > > Subject: LF: 500kHz simple 5W TX/RX > > transverter > > > > Dear All, > > > > My WSPR tx up-converter has now been modified to > > a full TX/RX tranverter suitable for WSPR, QRSS and > > CW in a > > very simple way, making use of the FT817 split > > facility which allows you > > to RX on 500kHz and TX on 28MHz. By adding a series LC > > between the TX PA and the > > FT817 input/output RF connection (with back-to-back diodes > > at the L and C > > junction, this allows "pass through" from the > > 500kHz ATU to the FT817 on RX > > (tuned to 500kHz). On TX, the diodes conduct and the C part > > is in parallel with > > the first cap in the TX low pass filter. This scheme is now > > working really well > > with good RX sensitivity and no change in TX power out. > > > > Schematic of the > > transverter is on my blog at http://g3xbm-qrp.blogspot.com/ > > . My > > attempt to add it as an attachment to an email here earlier > > failed. > > > > This more or less concludes my 500kHz experimenting, apart > > from > > getting a few more CW QSOs in the log. It's been great > > fun all the way with lots > > of support from folks here. I was going to try 136kHz, but > > think I will now give > > this a miss for now. > > > > 73s > > Roger G3XBM > > -- > > > > ------------------------------------------------------------- > > http://g3xbm-qrp.blogspot.com/ > > http://www.g3xbm.co.uk > > G3XBM > > GQRP 1678 ISWL G11088 > > > > > > > > > > > > -- ------------------------------------------------------------- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk G3XBM GQRP 1678 ISWL G11088 --0015175d09de893e81047a54071c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable With the transverter "in the open" (rat's nest) on the deskt= op there is a warm-up drift of about 40Hz HF until things settle down. Thi= s has not been an issue with WSPR as the drift in a single TX slot is only= about 1-2Hz usually (WSPR copes with this) and it soon settles down to 0H= z drift. I have not tried QRSS but imagine you'd have to ensure the xt= al oscillator is made more thermally stable for v.slow QRSS, but would gue= ss it would be OK for some moderate QRSS operation. Putting the whole unit= in a box should help.

My little circuit works, but is surely capable of much improvement, HI= .

73s
Roger G3XBM

2009/12/9 AL= AN MELIA <alan.melia@btinternet.com>
Sounds good Rog= er and Graham... what it the stability like the problem with transverters/= upconverters normally is that while ok for some modes they are =A0often no= t stable enough for the very weak signal modes. These are modes where you= need to know the frequency of a station very accurately because you will= not hear it, or it will only pop above the noise for short periods.

Alan G3NYK


--- On Wed, 9/12/09, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:

> From: Graham <g8fzk@g8f= zk.fsnet.co.uk>
> Subject: LF: 500kHz simple 5W TX/RX transverter >>DATA MODES<= ;<
> To: rsgb_lf_group@blacksheep.org
> Date: Wednesday, 9 December, 2009, 22:13
>
>
>
>
>
>
>
> All
>
> This =A0latest
> addition to =A0the
> HF / MF =A0tx convertor =A0opens the =A0door
> to =A0data
> communications =A0on 500 ... ranging =A0from
> 'all' =A0the K1JT systems
> through to =A0the =A0single carrier
> multi =A0tone
> systems =A0of
> MFSK =A0, =A0DOMINO and THOR =A0.. even
> the =A0almost
> forgotten =A0Amtor-arq =A0and Packtor modes , anyone
> still =A0have
> there pk232
>
> listed =A0are
> data =A0modes that =A0may be =A0used with
> non-linear systems :-
>
>
> http://groups.google.com/group/uk500khz/web/meat-g= rinder-comms
>
> G..
>
>
>
>
> From: Roger
> Lapthorn
> Sent: Tuesday, December 08, 2009 12:20 AM
> To: rsgb_lf_group@bla= cksheep.org
>
>
> Subject: LF: 500kHz simple 5W TX/RX
> transverter
>
> Dear All,
>
> My WSPR tx up-converter has now been modified to
> a full TX/RX tranverter suitable for WSPR, QRSS and
> CW =A0in a
> very simple way, making use of the FT817 split
> facility which allows you
> to RX on 500kHz and TX on 28MHz. By adding a series LC
> between the TX PA and the
> FT817 input/output RF connection (with back-to-back diodes
> at the L and C
> junction, this allows "pass through" from the
> 500kHz ATU to the FT817 on RX
> (tuned to 500kHz). On TX, the diodes conduct and the C part
> is in parallel with
> the first cap in the TX low pass filter. This scheme is now
> working really well
> with good RX sensitivity and no change in TX power out.
>
> Schematic of the
> transverter is on my blog at http://g3xbm-qrp.blogspot.com/
> . My
> attempt to add it as an attachment to an email here earlier
> failed.
>
> This more or less concludes my 500kHz experimenting, apart
> from
> getting a few more CW QSOs in the log. It's been great
> fun all the way with lots
> of support from folks here. I was going to try 136kHz, but
> think I will now give
> this a miss for now.
>
> 73s
> Roger G3XBM
> --
>
> -------------------------------------------------------------
> http://g= 3xbm-qrp.blogspot.com/
> http://www.g3xbm= .co.uk
> G3XBM
> =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
>
>
>
>
>




--
----------= ---------------------------------------------------
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
--0015175d09de893e81047a54071c--