[Lowfer] PSK31 on LF

[Dave Brown]

Ed-
No -- never tried any of the other PSK variants on LF. BPSK a la Bill de
Carle looks very interesting but not done anything about it yet.

I also think some of the WSJT variants are worth considering for LF -hardly
a rag-chewing mode but all sorts of interesting features. Hope to give it a
try soon.

Check out
http://pulsar.princeton.edu/~joe/K1JT/

73
 Dave, ZL3FJ

------ Original Message ----- 
From: "Ed Phillips" <evp@pacbell.net>
To: <lowfer@mailman.qth.net>
Sent: Sunday, November 30, 2003 5:43 AM
Subject: Re: [Lowfer] PSK31 on LF


> "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"
>
> Very interesting as that's about what we want to do here.  Did you ever
> try PSKAM10?
>
> Ed
> W6IZJ/IZJ
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