HT1550XLS LTR on a Kenwood LTR system? RX but no TX

[KC1OJX]

Hey all,

First post ever here, hopefully it’s in the right spot.

A little background before the question I’ve got:
I work at an ambulance service and am authorized to use my own personal radio there, and have been given the LTR system info to put into my radio.

We have an all kenwood system, and I was given all the information we have for it: Area Code, Home Repeater, Repeater ID/TX Freq/RX Freq, and talk group encode and decode IDs

I have set up my old TK380v2 for this system before and had no issues with it, however it appears that the HT1550XLS I have wants more info than what I was given.

We do our radios in house, but it is an entirely kenwood system so unfortunately the guy who does it doesn’t know what to do for the Motorola I have.

I know LTR is old, but it’s what we got so it’s what I have to work with.

Now onto the question:

I have my HT1550XLS all programmed and capable of receiving with no issues, however when I go to key it up, nothing happens. I know I’m on range of our tower because the kenwood portable that my coworker has can hit the tower and it has the same output power.

I think I have something in the wrong field in the CPS, but I’m not sure what info from the kenwood system goes into what field in the moto CPS.

Any help would be appreciated.

Regards,
KC1OJX

 

[KevinC]

Does the Motorola do plain old LTR or Passport only? Been a long time since I messed with LTR on a Motorola.

 

[WB5UOM]

I think invert tx data. maybe

 

[WB5UOM]

or not, its been a long time..
Im looking

 

[WB5UOM]

I think I am correct TX DATA INVERT

 

[KC1OJX]

Does the Motorola do plain old LTR or Passport only? Been a long time since I messed with LTR on a Motorola.

I think it does both, let me double check

 

[KC1OJX]

I think I am correct TX DATA INVERT

I’ll give this a shot tonight when im home and see what happens.

 

[Echo4Thirty]

I seem to remember there was a checkbox that had to be checked on the Motorola radios to get them to work properly on a standard LTR system. I think W55UOM is on the right track, but its been years since I have done this.

 

[KC1OJX]

I think I am correct TX DATA INVERT

Checked this. didnt do anything, however the kenwoods have this checked by default. I wonder if there could be something else. I will do some more digging, but if anyone has any other ideas feel free to leave them here.
Thank you all!

 

[WB5UOM]

hummm try inverting the Rx side leaving TX normal

 

[KC1OJX]

hummm try inverting the Rx side leaving TX normal

ended up unchecking both the RX and TX side but changed the front porch time from 12ms to 16ms to be closer to the 15ms of the Kenwood system, and it worked. (i think, it makes the acknowledgment tone at the beginning of TX now so i think it works).
I want to thank all of you guys for pointing me down the path of looking closer at the actual settings instead of giving up. Thank you!!

 

[WB5UOM]

interesting but great!