I will get the zlp interface tomorrow from the shed.
The codec driver for the 7100 doesn’t do any better than 48000 I will see if
the zlp does any better.
I always start wsjt-x 1st as it is my main program.
I only started testing because someone else mentioned this issue and I could
not see how a program that I considered a poor hack could not just compete with
wsjt-x but outperform it.
I will post back here tomorrow, it’s pouring with rain and I don’t want to go
out to the shed.
Richard m0clz.
From: Bill Somerville
Sent: Wednesday, September 16, 2015 9:59 PM
To: wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] WSJT-X JT65A Decode performance
On 16/09/2015 21:50, Richard Stanley wrote:
Hi Richard,
My sample rate is
1 channel 16 bit 48000 Hz
This is the interface built into the IC-7100
I do have a spare zlp interface so will get it out tomorrow and run the
jt65-hf-hb9hqx from that and wsjt-x from the built in interface, this way it
will be different soundcard interfaces with the same radio.
I can run on 2 different computers but as the jt65 variant decodes at 42.3
it is finished before wsjt-x even starts to decode.
Do you want me to leave the zlp interface at it's default settings or set as
the built in unit at 48000Hz ?.I believe the JT65-HF applications use an
11.025kHz sample rate so setting the interface for that to 44.1kHz should be
optimal as a divide by exactly four down conversion is trivial.
Thanks for trying this, I think it may be enlightening. Also you could try the
different options on the rig CODEC driver in the advanced properties if it has
them, something like:
all combinations the exclusive mode settings.
I would also be interested if starting WSJT-X before JT65-HB9HQX has any
apparent effect.
Richard m0clz73
Bill
G4WJS.
-----Original Message-----
From: Bill Somerville
Sent: Wednesday, September 16, 2015 9:32 PM
To: wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] WSJT-X JT65A Decode performance
On 16/09/2015 21:22, Joe Taylor wrote:
Bill --
Hi Joe,
My experience is that most claims that "program X" decodes JT65 better
than WSJT (or WSJT-X) are the result of using wrong soundcard sample
rates. I seem to remember that JT65-HF doesn't read (or write) *.wav
files, so it's very hard to do a real comparison of the decoders. I
suspect there may be a sample-rate issue, but that's only a guess.
That's my suspicion too and knowing that the Windows sample rate
conversion capability has been pretty poor in older versions makes me
think that this may be related to that. I have no idea how each version
of Windows deals with two applications asking for different sample rate
streams from the same input device. I would hope that each device is run
at the specified default sample rate and all streams are derived from
that converting rate if necessary. OTOH there are usually options in the
driver advanced properties about exclusive access that imply there can
be a first come first served (at the requested sample rate) basis. So
the order of starting applications might be a factor.
This would mean that verifying this would require two separate systems
taking analog audio from a single receiver or perhaps a system with two
sound cards.
-- Joe
73
Bill
G4WJS.
On 9/16/2015 4:01 PM, Bill Somerville wrote:
On 16/09/2015 20:53, Bill Somerville wrote:
I don't have the full decode lists for those but the OMs that sent them
can easily capture more examples so I will ask for the full list of
decodes from both applications with some new examples.
Looking at the files above, I doubt there are any other decodes apart
from the ones that WSJT-X gets as they are all on the last dregs of a
closing 15m band.
73
Bill
G4WJS.
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