WOLF - Transmit?

[Andre' Kesteloot]

Stewart Nelson wrote:

> Hi Mike and all,
>
> Bill de Carle VE2IQ has added WOLF mode to his KEYER package.
> Can upload to keyer or provide data for an EPROM, etc.
> Download from Bill's web page at
> http://cafe.rapidus.net/bill1/bbs.htm .
>
> 73,
>
> Stewart KK7KA
>
> ----- Original Message -----
> From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, March 21, 2001 4:30 AM
> Subject: LF: WOLF - Transmit?
>
> > Ok, so having cracked the receive side, how do I transmit WOLF?
> >
> > As I understand it there are three methods:
> >
> > 1 - Audio from the soundcard is fed into a 136kHz SSB transmitter, including
> > of course an HF SSB Tx with a transverter. Presumably the transmission is
> > independent of which sideband is selected.
> >
> > 2 - Audio from the soundcard can be combined with the 'VFO' in an XOR gate
> > and fed into an amplifier - presumably linear. This looks useful to me as I
> have
> > a 200W linear amp.
> >
> > 3 - The M0BMU method that allows the use of a non-linear Class D Tx. How
> > and why does this work?
> >
> > All three methods are potentially simple, but are made complex by the need for
> > very careful bandwidth tailoring to keep the transmission to about 20Hz wide.
> >
> > Have I got any of this wrong? Is there anything published on the subject?
> > What is in use?
> >
> > I understand that some Lowfers have used WOLF, but I suspect that
> > bandwidth has not been an issue because of the total width of the allocation
> > and the low ERP. I believe that Larry, VA3LK, has transmitted WOLF, but
> > again perhaps the bandwidth was not a problem. Jim, will you publish your
> > circuits? Or perhaps they are rig specific?
> >
> > It appears relatively easy to get going on receive but practical transmit has
> an
> > information black hole.
> >
> > Advice, please.
> >
> >
> >
> > Mike, G3XDV (IO91VT)
> > http://www.lf.thersgb.net
> >
> >