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[aprssig] Windows Igate software for 9k6 stream?

Keith VE7GDH ve7gdh at rac.ca
Sun Dec 5 16:29:35 UTC 2010

Andre PE1RDW wrote...

> UI-View is stable but limits to max 99 packets per 3 minutes, hardly 
> usable for streaming on 9k6.

That isn't true. While FILE - EDIT IGATE.INI only allows you enter
a maximum value of 99, you can set it to zero, which removes the limit.
It isn't apparent looking at the HELP, but if you view IGATE.INI with
a text editor, you will see...

     ;If you wish to disable the limits, you can put a '0'
     ;for all three values, but PLEASE don't disable the
     ;limits without first thinking very carefully about
     ;what you are doing and why you are doing it!

However, viewing the previous paragraph does warn you...

     ;PLEASE NOTE - The capacity of a 1200 baud RF channel
     ;is around 30 frames a minute (obviously it depends on
     ;frame length, TXD settings, etc). To gate 6 frames in
     ;a minute means that you are taking up around 20% of
     ;the channel capacity, and that's not allowing for your
     ;frames being digipeated! So before you increase these
     ;numbers, please bear in mind that many APRS experts
     ;would say that the defaults are too high. You should
     ;always try to use values that are appropriate for
     ;local conditions.

I would translate that to mean that the most you could gate to RF
would be about 240 frames per minute, but keep in mind that this
would represent 100% of the channel capacity.

Were you gating this to a shared frequency? Obviously, if you are
doing this on your "own" frequency, you can do whatever you want,
but if others are using the frequency, you will have to be careful
about what you are doing.

73 es cul - Keith VE7GDH
"I may be lost, but I know exactly where I am!"

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