🚀 go-pugleaf

tbruseha@hollywood.ems.cdc.com (Tom Brusehaver) writes:
: In article <C0HsFB.BvG@jabba.ess.harris.com> dwilliam@pizza.ess.harris.com (Dave Williams) writes:
: >
: >   Packet radio?  Hummm.  Here's one experience I've had with it:
: ...
: >the packet TNC transmitting into a pair of simple walkie-talkies.  The main
: ...
: >used a remote TV screen to observe the robot's position.
: >
: 
: >   The stumbling block for this system was the radio link.  The packet radio
: >worked very well, except for the fact that it tended to have an extrememly 
: >long latency time.  As a result, commands coming from the control system 
: >
: Most TNC's that I have delt with allow changing packet sizes, and
: transmit character.  Usually the packet size is rather large, and the
: transmit character is return (or linefeed).  When this character is
: recieved by the TNC, the TNC transmitts the current packet in the
: buffer.  
: 
It would seem that the random number generator used to 'decide' when to
transmit a packet in the TNC would render it useless for realtime ops.

You may have to resort to getting the ROM source code from TAPR, modify
it to disable the 'Slottime' (?) randomness and burn new roms. I don't
know about the legallity of this 'mode' on Amateur frequencies, but I'm
sure it'd be impolite to other stations on freq.

My original idea of using a TNC for this kind of work involved using
either NON-amateur freqs, (are the liscence free RC freqs for type accepted
equiptment only?) or the experimental subbands (on 6 and 2 meters?) recog-
nized by the ARRL band plan.

However, before doing ANY of this, I'd check with the ARRL or FCC on the
legallity of such experimental operation. 

: 
: >   Since you're familiar with packet controllers, I'll ask you:  do most 
: >TNC's have a way to specify transmit latency?  If we could get the TNC to

Check your manual on how to set the 'slottime'. It has very much to do with
the random number generator in the TNC.
: 
: Tommy B.

Fred
P.S. Sorry I hacked this article up so much. I must have missed the original.

-- 
Fred Floberg - N1GVA at Evil Weather Machines LTD.
email: ...!uunet!hsi!a3bee2!n1gva!fcf