LTR link

RADIONET · Post by **RADIONET** » Fri Nov 24, 2006 3:08 am

I am planning to convert a conventional VHF 3 sites 3 channels system to LTR. The links are in UHF.
How can the link be done ? I will use the Trident boards.
The customer already has the CDM1250 for mobiles and HT750 for portables.

tks

Post by **escomm** » Tue Nov 28, 2006 11:32 am

CDM1250 does not feature LTR trunking, and neither does the HT750.

thebigphish · Post by **thebigphish** » Sun Dec 03, 2006 9:18 pm

get yours hands on an LS+ model of the 1250 and you can go to town. We did a similar thing, with atrocious results (which i anticipated, but did it proof-of-concept anyways) with a bi-directional link system (just to prove to someone that it would work).

The conventional users will not get a PTT beep, and they will also not get a busy signal if the LTR is busy...and you will have to program a delay into the front end of the VHF to give the LTR time to come up on PTT...otherwise you will get some hideous front end-clipping.

It can be done...will it work as good as you think? no.

Birken Vogt · Post by **Birken Vogt** » Mon Dec 04, 2006 10:59 am

See this thread, I think this will do what you are looking for (interface conventional system to trunking and deal with the delay)

[url=http://batboard.batlabs.com/viewtopic.p ... onal+delay]

Specifically look down at the TCB-1.

I never acutally used it though because we ended up converting the customer over, all the radios at once and never had a hybrid system.

Birken

Post by **escomm** » Mon Dec 04, 2006 11:04 am

thebigphish wrote:get yours hands on an LS+ model of the 1250 and you can go to town.

There is no such thing as a CDM1250LS+ either. No CDM1250 will do LTR trunking

thebigphish · Post by **thebigphish** » Fri Dec 08, 2006 9:33 pm

i meant to say 1550LS+.