[Lowfer] PSK31 on LF

[Dave Brown]

John,
You may be interested to know that I ran some PSK31 tests with Bob, ZL2CA a
couple of years ago on 182.7 kHz-he had a very stable (level wise) but weak
signal and there was practically zero static - this WAS during the day-late
afternoon actually-would have been absolutely no use at night at that signal
strength.(path is ~300km)
I was very surprised to find I could get reliable copy when I could not hear
his signal at all.  Was using a step attenuator on rx input and wound in 19
dB past the 'audible' point till copy failed-this in a 200 Hz rx b/w, which
of course is only relevant in regard to the 'audible' limit.  Just
approximating the b/w difference at about 10:1 there's still 10 db or so
'improvement'. I was quite impressed!
73
 Dave,
ZL3FJ


----- Original Message ----- 
From: "John Andrews" <w1tag@charter.net>
To: <lowfer@mailman.qth.net>
Sent: Saturday, November 29, 2003 1:06 PM
Subject: Re: [Lowfer] Phasing exciters : status update


> Ed,
>
> > Several of us here in Southern California want to see what we can do
> > with PSK31 on VLF.
>
> It should work well with stations that can copy each other's CW by ear.
It's
> not a "down in the noise" mode like the slower BPSK stuff or Jason. But it
> would certainly give you nice typewritten communications where you would
> otherwise use CW.
>
> John A.
>
>
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