Patrick,
Thank you for the information.
If throughput is one the metrics for this comparision then I clearly see
your point.
The argument of reduced character set in PSKFEC31 is a little difficult as
it looked like Tony was not considering that particular metric as his
comparsion include RTTY ;-).
73 es hny
philw de ka1gmn
On Mon, Jan 4, 2010 at 12:35 PM, Patrick Lindecker wrote:
>
>
> 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 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
>>
>>
>
>
