Hello, this is not a serious problem. Our department multi-cast's it's tone out on 2 channels. The first is simplex, straight from headquarters. It activates the pagers with no problem (Minitor II, and III's) - the second channel also puts out the tone, but on a repeater. This is not large problem because all the pagers are set to recieve the tone on Freq-A (Simplex channel) even when scanning, b/c of priority scan. But, it would be nice to know why this is the case. First tone is 2260.0 - second tone is not a problem.
Mike
Tone will not activate pagers.... (slightly OT)
Moderator: Queue Moderator
Sounds like the repeater is clipping the audio on the 2260 tone. What I would do as a test is to program the Minitor 3's to use tones around the 500-1200 range and see if they work any better of the repeater.
It might also be that it's compressing or doing something else that's just enough to distort the audio. If the tones are also being sent with a PL tone that might be another avenue to look into.
I'm sure Will and a couple other repeater experts might jump in with a couple ideas as well.
-Alex
It might also be that it's compressing or doing something else that's just enough to distort the audio. If the tones are also being sent with a PL tone that might be another avenue to look into.
I'm sure Will and a couple other repeater experts might jump in with a couple ideas as well.
-Alex
As I understand the problem the pagers do not respond on the repeater output channel.
There are several problems that come to mind:
The deviation of the control station, and repeater deviation, and repeat level are suspect.
Another problem is that your system may require that the encoder keys the control station for a second or so before tones are sent to allow the repeater to decode the PL if so equipped, and key, and come up to power. Contrary to commoin belief this is not instantanious.
I have seen problems with AGC (Compression amps) that clip the first tone until it settels down.
( Old GE MASTR-Pro stations were notorious for these problems)
Once again this is a level setting issue in the repeater.
The only way to be sure what is going on is to monitor the Repeater and see what is wrong.
Aloha, Bernie
There are several problems that come to mind:
The deviation of the control station, and repeater deviation, and repeat level are suspect.
Another problem is that your system may require that the encoder keys the control station for a second or so before tones are sent to allow the repeater to decode the PL if so equipped, and key, and come up to power. Contrary to commoin belief this is not instantanious.
I have seen problems with AGC (Compression amps) that clip the first tone until it settels down.
( Old GE MASTR-Pro stations were notorious for these problems)
Once again this is a level setting issue in the repeater.
The only way to be sure what is going on is to monitor the Repeater and see what is wrong.
Aloha, Bernie
There have been several threads on this kind of problem. It has long been pointed out in the manufactur's manual, that it is important not to have any audio tones used for paging go into compression or clipping. If they do, the tones will be distorted and cause decode problems.
The manuals tell you to set the repeater throughput to no more than 0.5 Khz. deviation of compression. To tell if this is going on, listen to the audio on the input of the repeater, compare it to the adudio coming out of the repeater from the same source radio. They both should sound the same.
If the audio going into the repeater sounds lower than what you hear on the repeater output, it's a good bet that the radio tweek (technician) has the audio levels set wrong.
Next problem is to make sure that the control station ( dispatch point radio ) is set the same way. The paging tones should be set for only 3.0 Khz deviatoin. You do this by turning down the paging encoder level. Leave the normal mic audio at the 4.8 Khz. setting.
With the paging tones set at the 3.0Khz. level, you are not into compression on the repeater aduio. The tones will not be distorted and should work just fine.
Problem is that most radio shops I run into around the country don't do this. The ones that do are the exception. You will find that when the audio levels are set up this way, the background noise through a repeater will not be noticable. You won't have a feedback problem when radios are close to each other and one of them keys up.
Hope this gives you some ideas and where to look.
Jim
The manuals tell you to set the repeater throughput to no more than 0.5 Khz. deviation of compression. To tell if this is going on, listen to the audio on the input of the repeater, compare it to the adudio coming out of the repeater from the same source radio. They both should sound the same.
If the audio going into the repeater sounds lower than what you hear on the repeater output, it's a good bet that the radio tweek (technician) has the audio levels set wrong.
Next problem is to make sure that the control station ( dispatch point radio ) is set the same way. The paging tones should be set for only 3.0 Khz deviatoin. You do this by turning down the paging encoder level. Leave the normal mic audio at the 4.8 Khz. setting.
With the paging tones set at the 3.0Khz. level, you are not into compression on the repeater aduio. The tones will not be distorted and should work just fine.
Problem is that most radio shops I run into around the country don't do this. The ones that do are the exception. You will find that when the audio levels are set up this way, the background noise through a repeater will not be noticable. You won't have a feedback problem when radios are close to each other and one of them keys up.
Hope this gives you some ideas and where to look.
Jim