DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=btinternet.com;
  h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status;
  b=2hh/YFKuna/+v/9jSfoTBqvcsc1UwmlQEaLJUBLO0grpe57HDhW0ji9RuvtSGGeuOh1QZVh0DdO25oC2NVxP+1KcjcYsj066SNWWqyn/OnCFhhhM8ZPbL8+qxPDDmLwke0i1v8hhrrZycLnhvJiv1Tof+tHifbstpaUCeyQqUDE=  ;
Message-ID: <8E03B1FC5D984E998E470EE148378128@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <CAHAQVWNXyu8L0g-NNb4pGoUK=x2sDkpvuKvs=5-gTq2sLMwxDA@mail.gmail.com> <505B92F1.8080401@iup.uni-heidelberg.de> <000001cd9780$b5234cd0$1f69e670$@it>
Date: Fri, 21 Sep 2012 11:57:25 +0100
MIME-Version: 1.0
Subject: LF: Re: R: Homebrew stuff
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 8bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Mmmmm I cant say I have had that experience. I have built 40 to 50 pcbs for 
the Radio Astronomy group I belong to with no problems. I use a hotter tip 
and 0.4mm 99.2%Sn solder. Boards (nearly all through-hole) have been in use 
for 3 to 4 years and I have no returns due to joint failure. I will agree 
60/40 is easier and does look nicer. I think from what I hear the problems 
are with commercial "bulk" soldering not manual soldering. Like all things 
some skill must be acquired to make a nice job. I use a Weller TCP iron..

Alan
G3NYK
----- Original Message ----- 
From: "IZ2JGB Giorgio Barinetti" <iz2jgb@arimi.it>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, September 20, 2012 11:38 PM
Subject: LF: R: Homebrew stuff


Hi Stefan.

The lead-free solder is working but compared to the leaded one is really
brittle.

Lead give flexibility to the soldered joint.

Anyway if you want to try , buy a suitable tip and use it ony for leaded
free. (like petrol... hi)

Don't mix as they don't match.

73,
Giorgio.

-----Messaggio originale-----
Da: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] Per conto di Stefan Schäfer
Inviato: venerdė 21 settembre 2012 0.05
A: rsgb_lf_group@blacksheep.org
Oggetto: LF: Homebrew stuff

I like the homebrew suff pictures :-) There is quite individual ways to
build the equipment. Many use the copper plates as a board, i prefer the
breadboard since i grew up with it :-)
That's my todays work, under construction:
https://dl.dropbox.com/u/19882028/LF/SDC1.JPG
An add-on to my LF PA. Guess what it is?! :-)

73, Stefan/DK7FC

PS: What do people think about lead-free solder? I considered to try it
but not sure if this is a good idea...



Am 20.09.2012 22:11, schrieb Roger Lapthorn:
> This evening, my WSPR tests are with the latest version of my homebrew
> transverter, designed to be used with QRP rigs like the FT817 in
> "split" mode. The transmitter operates around 3.7MHz and transverts
> down to either 472 or 500kHz. On RX, the transverter simply passes the
> RX signal through to the FT817 which is used on 472/500kHz. This makes
> for a very simple yet effective design.
>
> I reverted to a double balanced mixer (SBL1 or ADE-1 or similar) for
> the TX mixer and this has made the design very stable and reliable
> now. The PA and ATU coils are air wound in the GW3UEP style on 22mm
> PVC pipe. The whole unit fits in a small plastic box.
>
> Already WSPR reports are coming through from PA, G, GW despite the use
> of my short vertical tuned against a copper water tank ground and
> resonated with a tapped coil on a ferrite rod. Signal levels from some
> suggest CW QSOs should be OK.
>
> Details of the transverter are available on my website and on my blog
> at
>
<http://g3xbm-qrp.blogspot.co.uk/2012/09/472500khz-transverter-finished.html
>.
>
> I hope this little circuit encourages a few newcomers to try the new
> band in due course. For now tests continue on 500kHz and further
> reports would be much appreciated.
>
> 73s
> Roger G3XBM
>
> -- 
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> https://sites.google.com/site/sub9khz/
> http://qss2.blogspot.com/
>
>

-----
Nessun virus nel messaggio.
Controllato da AVG - www.avg.com
Versione: 2012.0.2221 / Database dei virus: 2441/5281 -  Data di rilascio:
20/09/2012