Message-ID: <006d01c0b2a4$c7e099e0$687a37c0@w2ksn>
From: "Stewart Nelson" <sn@scgroup.com>
To: rsgb_lf_group@blacksheep.org
References: <3AB89EE8.130.AB12B1@localhost>
Subject: LF: Re: WOLF - Transmit?
Date: Wed, 21 Mar 2001 23:50:35 -0800
Organization: SC Group
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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
>
>