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LTR Puzzle

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opus

Member
Joined
Jan 19, 2003
Messages
155
Location
Sydney, NSW, Australia
I was going through one of our 800MHz LTR systems. One one of the LCNs that has been indentified a while ago (before Ltrunk et al.) as LCN 04. Trying to decode the idle pulse I am getting nothing with ltrunk or Eric's ltrdump. On viewing the stream in Ltrunk's stream mode I can see that the idle pulse seems to have the format of

SYNC: All 1's
Area: 1
Goto: 31
Home: 4
ID: 255
Free: 4

It is not just noise as it is repeatable. And I am now getting good signals from the site in question due to a new 800MHz antenna. Anyone got any ideas? Is this a channel that is telling users to bugger off or something? By the way all other LCNs in the system are AREA 0, also the system itself does indicate a FREE LCN of 04, but of course that could be another frequency we have not found yet.

Thanks

Opus
 

DaveH

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Joined
Jul 29, 2001
Messages
3,287
Location
Ottawa, Ont.
Strange sync...no wonder it is not detecting anything if it's looking for 0x158.
Everything else looks normal though. I take it you can change the sync word to match this odd one,
and ltrunk decodes OK?

Dave
 

opus

Member
Joined
Jan 19, 2003
Messages
155
Location
Sydney, NSW, Australia
I have not checked the CHECK against the packet. Might do that. Just wondering if anyone knew of wierd frames valid for LTR. This one is quite consistent.

Opus
 
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