If you looked at the PDF document of KN6KB's measurements, that is what is
showes.
The only difference between Pactor I, II and III is the throughput
(NetByte/minute) at various SNRs.
I can only assume that the BER or percent of errors ( zero errors?) was also
the same.
PIII +10 dB SNR +5 dB SNR 0 dB SNR
-5 dB SNR
Throughput 11,500 NB/min 9,000 NB/min 4,000 NB/min 200-300 NB/min
PII
Throughput 3,200 NB/min 2,500 NB/min 1,800 NB/min 200-300 NB/min
PI
Throughput 900 NB/min 900 NB/min 600 NB/min
100 NB/min
All these are what I see on KN6KB's chart.
At each of the above SNRs the Pactor mode has a shown throughput.
If need 9,000 NB/min at a +5 dB SNR, then you need Pactor III. But if you only
need a maximum throughput of 800 NB/min at +5 dB SNR, then you only need Pactor
I.
Walt/K5YFW
-----Original Message-----
From: [email protected]
[mailto:[EMAIL PROTECTED] Behalf Of kd4e
Sent: Thursday, January 11, 2007 9:44 AM
To: [email protected]
Subject: Re: [digitalradio] Re: Pactor versus Olivia
> SCS says that Pactor III is 4 times faster than Pactor II and the
> code would indicate such. Thus the raw channel throughput IS faster
> and the BER should be better. But as far as performance goes at
> varying SNRs will make a difference in throughput. At a -5 dB SNR on
> the KC7WW channel simulator KN6KB measured the throughput of Pactor
> I/II/II as about the same. At a + 10 dB SNR, the maximum throughput
> of Pactor I was measured as ~ 100 NetBytes/minute. Pactor II measures
> as ~3000 NetBytes/minute and Pactor III measures as ~11,000
> NetBytes/minute....almost 4 times that of Pactor 73, Walt/K5YFW
Do I correctly read this to mean that at high-noise
low-signal strength conditions Pactor I, II, & III
are equal?
Does that mean that the non-proprietary Pactor I
that runs on a sound card is just as good as the
proprietary and unaccountable Pactor II & III
under rough conditions?
--
Thanks! & 73, doc, KD4E
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