Well yes Joe ( K) is right, BPSK
is better , but needs a linear system to
transmit .... Joe (EA) has stated , he could
extract another 6 dB if the modulation
system was changed ......but that's no longer
Op-ook a fsk return to zero, as in some modes is
not bpsk ,
As Jim's published design shows its possible
to add a modulator to a class e amp , by
envelope restoration ,
WLOF is already coded and makes use of multi
pass to gain s/n , but is psk and
needs a liner system ...and is not a one-pass
decode system , when the s/n is low .but at
-41 dB , by what ever scale , OP32 is well into
the noise in single pass ?
Which is back to where we started .....
But as Laurence's 'Pesky Protons' go and
play somewhere else , then we all have a
ring side seat for Stefan's 'Flying Circus' at
least over this winter !
G..
Sent: Wednesday, September 12, 2012 1:40 PM
Subject: LF: Fwd: Re: Ideas for a slower WSPR for the 137 khz
band
Message from Joe/K1JT.
BTW i don't know if it is OK for
Joe that his email is forwarded to everyone in the web! But i think it would be
OK for him to forward it to a limited number of active radio amateurs operating
in the 137 kHz band. So if you make this email public in the web, it is your
decision!
73, Stefan/DK7FC
-------- Original-Nachricht --------
Hi Stefan,
Thanks for your interesting message.
A super-slow version of WSPR (or something like WSPR) should be
possible, and I might be able to devote some time to writing the
necessary code. You should know that I will not be able to get to it
for several months, however. Perhaps near the end of this year.
One question for you: It seems to me that propagation at 137 kHz (and
possibly also 475 kHz) is generally stable enough to make very slow BPSK
a better modulation scheme than the 4-FSK used in today's WSPR. Do you
agree?
-- 73, Joe, K1JT
