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Date: Thu, 20 Sep 2012 21:11:04 +0100
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From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: LF: 472/500kHz 10W transverter
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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/

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This evening, my WSPR tests are with the latest version of my homebrew tran=
sverter, designed to be used with QRP rigs like the FT817 in &quot;split&qu=
ot; mode. The transmitter operates around 3.7MHz and transverts down to eit=
her 472 or 500kHz. On RX, the transverter simply passes the RX signal throu=
gh to the FT817 which is used on 472/500kHz. This makes for a very simple y=
et effective design.<br>
<br>I reverted to a double balanced mixer (SBL1 or ADE-1 or similar) for th=
e TX mixer and this has made the design very stable and reliable now. The P=
A and ATU coils are air wound in the GW3UEP style on 22mm PVC pipe. The who=
le unit fits in a small plastic box.<br>
<br>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 QS=
Os should be OK.<br>
<br>Details of the transverter are available on my website and on my blog a=
t &lt;<a href=3D"http://g3xbm-qrp.blogspot.co.uk/2012/09/472500khz-transver=
ter-finished.html">http://g3xbm-qrp.blogspot.co.uk/2012/09/472500khz-transv=
erter-finished.html</a>&gt;.<br>
<br>I hope this little circuit encourages a few newcomers to try the new ba=
nd in due course. For now tests continue on 500kHz and further reports woul=
d be much appreciated.<br><br>73s<br>Roger G3XBM<br clear=3D"all"><br>-- <b=
r>
<a href=3D"http://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</=
a><br><a href=3D"http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br><a h=
ref=3D"https://sites.google.com/site/sub9khz/">https://sites.google.com/sit=
e/sub9khz/</a><br>
<a href=3D"http://qss2.blogspot.com/">http://qss2.blogspot.com/</a><br><br>=
<br>

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