Our Department just went to CDM 1550 ls+ radios on a Passport trunking system with three towers locally.
So far the delay and inconsistant coverage has been less than satisfying.
My question is can this radio, in the current MHZ. range use conventional channels on our passport repeaters?
Also one more question can these 400MHZ. radios be reprogramed down to 154. MHZ range or does it take different hardware?
Any info you may have would be very greatly appreciated
Thanks countyguy26
Passport LTR vs. Conventional cdm 1550 ls+
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countyguy26
- New User
- Posts: 2
- Joined: Sun Mar 23, 2008 7:05 am
Re: Passport LTR vs. Conventional cdm 1550 ls+
Last question first. No the UHF radio can not be programmed down to the VHF or 154 MHz region.
Second, but really the first question, yes you should be able to program in conventional channels. As for
using conventional channels on a Passport system, don't think that is going to fly very far. You might
be confused and are trying to say or ask can the Passport system be converted to conventional
repeaters. That may not be as easy as you think. The controller will have to come out and the repeaters
will have to be re-cabled. The big question is can you modify your license to use conventional repeaters?
Your opening up a big can of worms here. Maybe the big question to look at is what were you using
before you changed to the Passport system? What kind of coverage did you have? Why did the system
get changed? Who engineered it?
This is not something that you just want to jump in and start making changes without having solid info
on what the problems are and what, where and how your going to solve these problems.
Jim
Second, but really the first question, yes you should be able to program in conventional channels. As for
using conventional channels on a Passport system, don't think that is going to fly very far. You might
be confused and are trying to say or ask can the Passport system be converted to conventional
repeaters. That may not be as easy as you think. The controller will have to come out and the repeaters
will have to be re-cabled. The big question is can you modify your license to use conventional repeaters?
Your opening up a big can of worms here. Maybe the big question to look at is what were you using
before you changed to the Passport system? What kind of coverage did you have? Why did the system
get changed? Who engineered it?
This is not something that you just want to jump in and start making changes without having solid info
on what the problems are and what, where and how your going to solve these problems.
Jim
countyguy26 wrote:Our Department just went to CDM 1550 ls+ radios on a Passport trunking system with three towers locally.
So far the delay and inconsistant coverage has been less than satisfying.
My question is can this radio, in the current MHZ. range use conventional channels on our passport repeaters?
Also one more question can these 400MHZ. radios be reprogramed down to 154. MHZ range or does it take different hardware?
Any info you may have would be very greatly appreciated
Thanks countyguy26
-
countyguy26
- New User
- Posts: 2
- Joined: Sun Mar 23, 2008 7:05 am
Re: Passport LTR vs. Conventional cdm 1550 ls+
Jim
Thank you for your reply, you were correct in aspect of the passport repeaters being converted to conventional repeaters. I guess it was wishful thinking that it would be a simple change.
The problem we are having is very inconsistent performance. One time the transmission comes across perfectly, a few seconds later when you key up, nothing at all comes across. If there is wind, rain or snow nothing but static comes across the radio. Even in perfect conditions the transmission will go from clear, to nothing but static in a matter of seconds and loose the repeater completely for no apparant reason.
Another problem we have is a delay from the time you key-up until the time that the repeater kicks over. Most of the time, this is not a problem but when a fight breaks out it's hard to hold a key down for three seconds to call for help, (very frustrating with your hands full).
The reason for the change to this system was poor coverage on our old frequency with only two repeaters in the entire county and an honest desire for improvement.
That being said, we are the only department on this entire trunking system. We are really grasping for straws to find a simple temporary fix for our system. If you have any suggestions or tips for us to explore it also would be greatly appreciated.
Thanks again countyguy26
Thank you for your reply, you were correct in aspect of the passport repeaters being converted to conventional repeaters. I guess it was wishful thinking that it would be a simple change.
The problem we are having is very inconsistent performance. One time the transmission comes across perfectly, a few seconds later when you key up, nothing at all comes across. If there is wind, rain or snow nothing but static comes across the radio. Even in perfect conditions the transmission will go from clear, to nothing but static in a matter of seconds and loose the repeater completely for no apparant reason.
Another problem we have is a delay from the time you key-up until the time that the repeater kicks over. Most of the time, this is not a problem but when a fight breaks out it's hard to hold a key down for three seconds to call for help, (very frustrating with your hands full).
The reason for the change to this system was poor coverage on our old frequency with only two repeaters in the entire county and an honest desire for improvement.
That being said, we are the only department on this entire trunking system. We are really grasping for straws to find a simple temporary fix for our system. If you have any suggestions or tips for us to explore it also would be greatly appreciated.
Thanks again countyguy26
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Mikey
- Posts: 410
- Joined: Wed Sep 05, 2001 4:00 pm
- What radios do you own?: CDM1550 LS+, HT1250, MCS2000
Re: Passport LTR vs. Conventional cdm 1550 ls+
The Company i work for owns the 3rd. Largest Passport Setup in the U.S., and i can tell you that the keyup delay shouldn't be but about 1.5 - 2 seconds. It sounds like the Passport Switch is not setup right. If you cannot get the installer to remedy the situation you might give Trident microsystems a call and see if they can offer some assistance; they are the company that makes the Passport Switch.
Mike
Mike