>
>
>
>
>
>
>
>
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:
[email protected]>
>
>
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
>
>
>
>
>
