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Date: Fri, 21 Sep 2012 00:04:33 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: LF: Homebrew stuff
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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/
>
>