Hello Phil,
According to my measures (under gaussian noise), PSKFEC31 has a minimum S/N of
-14.5 dB (2.5 dB better than PSK63F) but the speed is twice weaker (28 wpm).
It includes a FEC system (bit based) which permits to have a more robust mode
than PSK31 (about 5 times less errors than PSK31), in good conditions. However,
I think PSK63F is more robust than PSKFEC31 in bad conditions.
Moreover, PSKFEC31 has a reduced set of characters. PSKFEC31 can be received in
a panoramic way (multi reception).
So to abstract, it is more sensitive and more robust than PSK31, more sensitive
than PSK63F but less robust than this one.
PSK63F is in all cases better than PSK31. The only advantage of PSK31 is its
smaller bandwidth.
73
Patrick
----- Original Message -----
From: Phil Williams
To: digitalradio@yahoogroups.com
Sent: Monday, January 04, 2010 11:16 AM
Subject: Re: [digitalradio] IZ8BLY's PSK63F
Very interesting. What about PSKFEC31 under the same test scenarios?
Certainly, there would be more a in throughput, but that is a matter of some
liberal use of CW shorthand.
philw de ka1gmn
On Mon, Jan 4, 2010 at 2:48 AM, Tony <d...@optonline.net> wrote:
All,
Recent path simulation tests indicate that Nino Porcino's PSK63F offers
better performance over PSK31 and PSK63 in a couple of areas. The most
significant improvement is it's ability to endure Doppler spread found on
paths that cross the polar ionosphere. Both PSK31 and PSK63 fail miserably
in this area; see high-lat test samples below.
Path Simulation: High Latitude (Moderate) Path Delay: 3ms, Doppler spread
10Hz
Pangram Text: Quick Brown Fox
PSK63F -- the quick brown fox jumps over the lazy dog
PSK63 -- mev roe tt#dtorl|f- bn ô mp e o ihe Fzy dg
PSK31 -- nls oSer Òe naAeta qlipM h nV o T rn agâ o
RTTY -- TH QACKH492, FOJUMP OR THTLAZY G
Sensitivity-wise, it's quite a bit more sensitivity than PSK63, but only
marginally better than PSK31. Although it's speed is about 25% faster than
PSK31, it's about 40% slower than PSK63. Average wmp rate seems to be 63
wpm
for PSK63F.
Lowest S/N (sensitivity)
PSK63F -12db
PSK63 -7db
PSK31 -11db
RTTY -5db
Additional path tests indicate that PSK31 and PSK63F perform about the same
under moderate mid-latitude conditions (CCIR fading channel). Tests show
that PSK31 and PSK63F will outperform PSK63 when signals are weak under
quiet conditions since they both have greater sensitivity.
It would be interesting to hear from our HF digital friends up north who
experience the distorting effects of the polar ionosphere on a regular
basis; this is where the PSK63F mode can be put to the test.
Available software:
Nino Porcino's Stream -- http://xoomer.virgilio.it/aporcino/
Patrick Lindeckers Multipsk -- http://f6cte.free.fr/index_anglais.htm
(thanks for including PSK63F Patrick)
Tony, K2MO
