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VE2HAR > MT63 15.03.05 19:03l 175 Lines 5119 Bytes #-7016 (0) @ WW
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Subj: Re: [MT63]
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Hi Walt, I agree we need to define our text that we send, the amount=20
of bytes that are sent and then have a method to check the number of=20
errors. The size can be more than 3 Kbytes but no larger is better. The=20
text can be anything but it must conform with the ASCII text format. The=20
test text must be sent to this list so everyone that is interested can=20
get the accurate file. In linux you can check both files by knowing=20
there total byte size. If they are the same, it's perfect. You get the=20
byte size with ls -al.
Using the Linux gMFSK I can send the test file directly with clicking=20
File and then Send file. When I receive the test file I can simply cut=20
it out of my lof file. I have my system set to log everything. Fun to=20
look at later.
I have a file we can use. It is the ARRL bandplan. It is way too long=20
but I will cut it down to about 3,000 words.
karl
dubose@texas.net wrote:
>Thanks to Patrick, F6IN, for bringing PathSim to our attention. This is=
truly a
>nice application.
>
>Building on what I believe Tomi or others have said, as well as my own t=
houghts
>about having a "test" file. Also, looking at G4HPE's papers found at
>http://www.rsgb.org/emergency/datamodesinfo.htm . And not to be left ou=
t, my
>several E-Mails with Charles, G4GUO.
>
>Back in Jan/Feb of 1990, the US TRANSCON began "testing", on-the-air, HF
>transmissions of a file which became their standard. It was a 40KB fil=
e. The
>modes being used were the MIL-STD-188-110 type. These were interesting =
test.=20
>The MD5 sum was used on each received file to verify that its was the sa=
me as
>the original file. Throughput and accuracy were important.
>
>G4HPE in his paper "A PRACTICAL EVALUATION AND COMPARISON OF SOME MODERN=
DATA
>MODES" (http://www.rsgb.org/emergency/articles/datmodes2.pdf) Richard sp=
eak of
>the test he did on MT63 and MFSK16.
>
>Also, on page 17 of Rick=92s, KN6KB, presentation to the DCC last Septem=
ber
>(2004), he shows throughput using an HF channel simulator from KC7WW=92s=
Oregon
>Software Factory.
>
>G4HPE=92s test concluded that MT63 had a throughput of 200 WPM at a =965=
dB SNR on a
>poor CCIR Channel. KN6KB=94s results for Pactor II/III indicate a simil=
ar (if not
>lower) throughput under the same signal conditions.
>
>While I do not doubt these findings, I believe that as some in this grou=
p are
>very technical, we need to develop a standard method of testing various =
new
>modes under varying conditions using Moe Wheatley=92s, AE4JY, PathSim.
>
>Here is my suggestion.
>
>1) Create/develop a standard file of at least 400 words (5 characters on=
e space
>per word, 6 bytes =852.4KBPs).
>
>2) Generate this file in the mode to be tested and store it electronical=
ly on a
>computer hard drive, CD or other magnetic storage media.
>
>3) =93Play=94 this file through the AE4JY=92s PathSim application at the=
following HF
>Simulation parameters:
>
>
>
> CCIR 520-2 Conditions SRN (in dB)
> Good Conditions +10 +5 0 -5
> Moderate Conditions +10 +5 0 -5
> Poor Conditions +10 +5 0 -5
> Flutter fading +10 +5 0 -5
> Low-latitude quite +10 +5 0 -5
> Low-latitude disturbed +10 +5 0 -5
> Mid-latitude quite +10 +5 0 -5
> Mid-latitude disturbed +10 +5 0 -5
> High-latitude quite +10 +5 0 -5
> High-latitude disturbed +10 +5 0 -5
>
>4) Record output or =93play=94 it through the mode detector and capture =
the output.
>
>
>5) With software techniques to manually determine the throughput at each=
signal
>condition.
>
>6) Document the results and provide the results to interested parties.
>
>I realize that this is just a rough draft of a testing process but thin=
k its is
>within the capability of a number of list members and the results might =
be VERT
>INTERESTING.
>
>You comments solicited.
>
>Thanks & 73,
>
>Walt/K5YFW
>
>
>
>
>
><< Try MT63 on 80m - great fun!>>
>
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