[AG-TECH] audio problems

Robert Olson olson at mcs.anl.gov
Tue Sep 11 06:50:50 CDT 2001

At 02:19 AM 9/11/2001 -0400, Roy D. Hockett wrote:
>Are there an document on how to test audio on the access-grid.  I appear 
>to be sending rtp, and other report hear it.  However, I don't appear to 
>hear anyone else, and I don't seem to be getting any thing from the echo 
>         All pointers would be greatly appreciated.

There's a set of slides I put together a couple months ago that lay out a 
setup & testing procedure. At some point these'll be put together into an 
AGDP document ...

The basic sequence is this:

Install hardware.
Perform basic Gentner setup (coarse level setting, set up presets per 
Set Gentner mic levels
Set output / speaker volume levels.
Test with rat and reflector
Test on-grid.

If you make it all the way through the calibration & setup steps, you 
should have little problem with actual AG use.

The tutorial slides are at


Regarding the problem you mention: Do you see levels in rat for incoming 
audio? If you bring up rat's Options window, go to Audio, and turn on the 
test tone, do you hear a tone? If not, check the Gentner level meter for 
the input the PC/MM100 output is connected to. If there's no level there, 
you probably have a cabling problem. If there is, check the routing and the 
cabling path to your speakers.

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