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" <[email protected]>
To: <[email protected]>
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: [email protected]
[mailto:[email protected]] Per conto di Stefan Schäfer
Inviato: venerdì 21 settembre 2012 0.05
A: [email protected]
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
| 
