[amsat-bb] FT-847 CAT

Jeff Breitner lists at rudn.com
Mon Jun 13 00:26:09 UTC 2016

On 6/12/16 2:10 PM, Greg D wrote:
> Whenever I use Gpredict with my 847, I need to set the refresh rate to
> about 5 seconds (5,000 ms).  Never understood why, but updating too
> often quickly ends up with a hang.  This is on a Linux system with a
> real serial port (not USB).  I'm using "rigctld -m 101 -r /dev/ttyS0 -t
> 4532 -v -s 57600" as the run string for the rig control process.
> Good luck,
> Greg  KO6TH

Yeah, I have to set it to no more than 2000ms or it causes Gpredict to 
cough and gasp.  Gpredict has multithreading, but the writes to the rig 
control appear to be blocking.  I don't think it matters much, the radio 
can only take the data so fast anyway.

The radio works fine with any of the desktops I use, it just won't work 
with any of my portable computers.  Confirmed exact drivers in Windows, 
sniffed the ports in Linux and hooked up a 'scope to watch the 
waveforms.  Created test programs to try to look for buffering issues. 
Nothing is a smoking gun...'cept maybe that these USB->Serial converters 
are just good enough to work with (maybe) better chipsets that are on 
these desktop motherboards.  Dunno.

I have a GearMo adapter showing up this week.  If it works, great, if 
not this smaller desktop will be what I use.

What is so puzzling is that, it worked with everything up until a few 
weeks ago.



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