Return-Path: Received: from rly-ma10.mx.aol.com (rly-ma10.mail.aol.com [172.20.116.54]) by air-ma07.mail.aol.com (v126.13) with ESMTP id MAILINMA071-8cf4b2036df38c; Wed, 09 Dec 2009 18:46:51 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-ma10.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMA101-8cf4b2036df38c; Wed, 09 Dec 2009 18:46:41 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NIWDy-0006rj-F4 for rs_out_1@blacksheep.org; Wed, 09 Dec 2009 23:45:38 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NIWDx-0006ra-IS for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2009 23:45:37 +0000 Received: from smtp5.freeserve.com ([193.252.22.151] helo=smtp6.freeserve.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NIWDw-00070J-Bn for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2009 23:45:37 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3521.me.freeserve.com (SMTP Server) with ESMTP id B33521C00088 for ; Thu, 10 Dec 2009 00:45:30 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3521.me.freeserve.com (SMTP Server) with ESMTP id A5BD81C000AB for ; Thu, 10 Dec 2009 00:45:30 +0100 (CET) Received: from AGB (unknown [91.109.5.59]) by mwinf3521.me.freeserve.com (SMTP Server) with SMTP id 1F5791C00088 for ; Thu, 10 Dec 2009 00:45:30 +0100 (CET) X-ME-UUID: 20091209234530128.1F5791C00088@mwinf3521.me.freeserve.com Message-ID: <40DCCD8CCDD64010AC2B8CF002BBCA25@AGB> From: "Graham" To: References: <510B0611943F48E1975A8F833B63FBD5@AGB> <20250.29213.qm@web86503.mail.ird.yahoo.com> <9afca2640912091527s766a7e64wa10ad3be7c7f6f08@mail.gmail.com> In-Reply-To: <9afca2640912091527s766a7e64wa10ad3be7c7f6f08@mail.gmail.com> Date: Wed, 9 Dec 2009 23:45:19 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 X-Karma: unknown: 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="----=_NextPart_000_00C2_01CA7929.AA96CCB0" 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_MESSAGE, MISSING_OUTLOOK_NAME 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 ------=_NextPart_000_00C2_01CA7929.AA96CCB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Roger=20 Thanks for posting the circuit, I have added you to the converto= r hall of fame ... http://groups.google.com/group/uk500khz/web/low-frequency-converters?m= sg=3Dns G ..=20 From: Roger Lapthorn=20 Sent: Wednesday, December 09, 2009 11:27 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: 500kHz simple 5W TX/RX transverter >>DATA MODES<< 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 ha= s 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, bu= t 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 probl= em with transverters/upconverters normally is that while ok for some= modes they are often not stable enough for the very weak signal mode= s. 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 abo= ve 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 > > > > > --=20 ------------------------------------------------------------- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk G3XBM GQRP 1678 ISWL G11088 ------=_NextPart_000_00C2_01CA7929.AA96CCB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Roger
 
Thanks for  posting the =20 circuit,  I have  ad= ded =20 you  to the convertor  hall  of fame ...
 
 
G ..
 

Sent: Wednesday, December 09, 2009 11:27 PM
Subject: Re: LF: 500kHz simple 5W TX/RX transverter >&g= t;DATA=20 MODES<<

With the transverter "in the open" (rat's nest) on the= desktop=20 there is a warm-up drift of about 40Hz HF until things settle down. Th= is has not=20 been an issue with WSPR as the drift in a single TX slot is only about= 1-2Hz=20 usually (WSPR copes with this) and it soon settles down to 0Hz drift.= I have not=20 tried QRSS but imagine you'd have to ensure the xtal oscillator is mad= e more=20 thermally stable for v.slow QRSS, but would guess it would be OK for= some=20 moderate QRSS operation. Putting the whole unit in a box should help.<= BR>
My=20 little circuit works, but is surely capable of much improvement,=20 HI.

73s
Roger G3XBM

2009/12/9 ALAN MELIA <alan.melia@btinternet.com= >
Sounds= good Roger and Graham... what it the stability like=20 the problem with transverters/upconverters normally is that while ok= for some=20 modes they are  often not stable enough for the very weak signa= l modes.=20 These are modes where you need to know the frequency of a station ve= ry=20 accurately because you will not hear it, or it will only pop above= the noise=20 for short periods.

Alan G3NYK


--- On Wed, 9/12/09,= Graham=20 <g8fzk@g8fzk.fsnet.co.= uk>=20 wrote:

> From: Graham <g8fzk@g8fzk.fsnet.co.uk>
>=20 Subject: LF: 500kHz simple 5W TX/RX transverter >>DATA MODES&l= t;<
> To: rsgb_lf_group@blacksheep.org
>=20 Date: Wednesday, 9 December, 2009, 22:13
>
>
>
>
>
>
>=
>=20 All
>
> This  latest
> addition to  the<= BR>> HF=20 / MF  tx convertor  opens the  door
> to=20  data
> communications  on 500 ... ranging  fro= m
>=20 'all'  the K1JT systems
> through to  the  sing= le=20 carrier
> multi  tone
> systems  of
> MF= SK  ,=20  DOMINO and THOR  .. even
> the  almost
>= forgotten=20  Amtor-arq  and Packtor modes , anyone
> still=20  have
> there pk232
>
> listed  are
&= gt; data=20  modes that  may be  used with
> non-linear sys= tems=20 :-
>
>
> http://group= s.google.com/group/uk500khz/web/meat-grinder-comms
>
>= =20 G..
>
>
>
>
> From: Roger
>=20 Lapthorn
> Sent: Tuesday, December 08, 2009 12:20 AM
>= To: rsgb_lf_group= @blacksheep.org
>
>
>=20 Subject: LF: 500kHz simple 5W TX/RX
> transverter
>
&= gt; Dear=20 All,
>
> My WSPR tx up-converter has now been modified= to
>=20 a full TX/RX tranverter suitable for WSPR, QRSS and
> CW  = ;in=20 a
> very simple way, making use of the FT817 split
> fac= ility=20 which allows you
> to RX on 500kHz and TX on 28MHz. By adding= a series=20 LC
> between the TX PA and the
> FT817 input/output RF= connection=20 (with back-to-back diodes
> at the L and C
> junction,= this allows=20 "pass through" from the
> 500kHz ATU to the FT817 on RX
>= ; (tuned=20 to 500kHz). On TX, the diodes conduct and the C part
> is in= parallel=20 with
> the first cap in the TX low pass filter. This scheme is= =20 now
> working really well
> with good RX sensitivity and= no change=20 in TX power out.
>
> Schematic of the
> transverte= r is on my=20 blog at http://g3xbm-qrp.blogspot.com/
> . My
> attempt=20 to add it as an attachment to an email here earlier
>=20 failed.
>
> This more or less concludes my 500kHz experi= menting,=20 apart
> from
> getting a few more CW QSOs in the log. It= 's been=20 great
> fun all the way with lots
> of support from folk= s here. I=20 was going to try 136kHz, but
> think I will now give
>= this a miss=20 for now.
>
> 73s
> Roger G3XBM
> --
><= BR>>=20 -------------------------------------------------------------
>= ; h= ttp://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
>=20 G3XBM
>  GQRP 1678      ISWL=20 G11088
>
>
>
>
>




--=20
-------------------------------------------------------------
<= A href=3D"http://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.= com/
http://www.g3xbm.co.u= k
G3XBM  =20  GQRP 1678      ISWL G11088


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