[Lowfer] PSK31 audio beacon enhancement

[lowfer@mailman.qth.net]

David:

After you make your additions, please let us know where to download the
schematics for the revised circuits.

Thanks,

Tom N8TL
On Mon, 22 Jul 2002 23:58:46 -0400 David Willmore
<davidwillmore@iamanidiot.com> writes:
> 
> For those not on the New Jersey QRP mailing list, the project to
> which I am referring is 
> http://www.njqrp.org/psk31beacon/psk31beacon.html
> It is a small board that uses a Ubicom SX28 with an R2R ladder to 
> generate baseband PSK31 signals.
> 
> I'm looking to modify the audio beacon design--with the addition
> of a simple little daughter card--to add some more functionality.
> For one, it will gain a little EEPROM so that it can be programmed
> and not forget thing when it loses power.  Secondly, I want to make
> it more flexable so that it will do more modes.  
> 
> I expect to get it to do:
> PSK31 (psk and qpsk)
> maybe slower PSK
> CW
> QRS(S)
> Jason
> DifCW (there are several kinds)
> WOLF
> 
> Maybe it will do:
> MSK16
> RTTY
> 
> It will *not* do:
> MT63
> 
> That I would like to ask is if there is any interest in this?
> So, should I only make this for myself or should I expect this
> to become a kit some day?
> 
> If there is interest, what of the above modes stike your fancy?
> Comments are especially appreciated on the 'optional' modes.
> 
> I expect to have a small program on a PC that will encode your
> mode/message into a small 'program' which is interpreted by the
> beacon.  Something like "play this frequency for this long".
> That will do CW, DifCW, Jason, QRS(S), RTTY, and--I think--WOLF.
> 
> There will need to be a more complex mode to do PSK and QPSK
> (and maybe WOLF).
> 
> MSK16 will be similar but will have to say "play these *two* tones
> for this long".  Being that flexable, it may very well support
> new modes that aren't designed yet with a simple upgrade of the
> PC software.  *crosses fingers*
> 
> I expect to attach 4Kb to 8Kb of EEPROM via a serial connection
> to store this info.  I imagine that will provide a reasonably
> long enough period for most use.
> 
> The real beauty of this design is the low cost.  The base board
> is just $25(USD).  I don't expect the add-on to cost more than
> half of that (no promises!).  So, that sort of puts it near
> the expendable side of things as far as 'unattended beacon getting
> hit by lightning' goes.
> 
> I hope that the Europeans, with their longer LF/VLF experience,
> will be able to contribute some of that experience WRT beacon
> operation.  Though, those in NA should have some good information
> as that's about all we can do on LF/VLF. :(  But not for long...
> 
> Oh, please clip unnecessary groups off of the send list.  I monitor
> all of these lists and will summarize/crosspost anything that is
> relevant to the other lists.  I don't intend to clog up anyone's
> mailbox.
> 
> Cheers,
> David N0YMV
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