The consol is used as a gateway between a VHF repeater system and a 800 trunked P25 system, when a VHF mobile talks the audio to the 800 mobile sounds low but it sounds OK to the dispatcher and other mobiles. When the dispatcher tx the audio is loud so muschso that the 800 mob is turned down making the problem worse between the VHF and 800. RX evels from the VHF system are in the normal range, some moble operaters have a problem with how far they talk from the mic, but any normal communication are in the -10 to 0 range.
I was though that the patch audio was on the tdm bus from on BIM to the other so is there an adjust ment jumper or something to boost the patch level?
Edgar
CCII Gold Elite patch audio
Moderator: Queue Moderator
Re: CCII Gold Elite patch audio
Having worked on numerous interfaces with interop gateways and Motorola systems, it takes some measurements
with some audio test equipment to point the finger.
With that said, what I have found in traveling around the country, is that many radio techs just don't know
how to set up the audio on radio systems or just don't give a damn. I have seen audio levels as low as a
neg 30 db for the normal audio and as high as a plus 10 db. These audio levels need to be adjusted to
standard levels before anything can be done about just what your talking about. Both the RX level leaving
the radios going to the consoles and the TX levels arriving at the radios. If your using leased telephone
lines, the phone company gets upset if your levels are too high. It causes problems in their equipment
as well as causes cross talk.
There have been a good number of threads on adjusting audio levels on remote controlled radios. A search
will pull up most of the discussions.
Now that I have shot off my mouth about audio levels in and out of the radios, the consoles do have a good
deal of gain and AGC to compensate for low or high RX audio levels. The AGC doesn't do anything for the
audio levels being patched. There is some level control on the BIM cards, but the real issue is probably in
the way the radio tech has set the levels up coming out of and into the radios.
To actually point the finger to where the problem is, will require someone to put a meter on the BIM card input
from the radio RX audio and see what level it is at. If it isn't at least a negative 10 db, then the radio tech
needs to resolve the problem. The radio tech also needs to measure the TX audio leaving the BIM card and
make sure it is at the correct level.
You could have multiple issues causing the problem your talking about. Without going through each and every
radio channel on your console, you might end up with other issues with low or high audio. The radio techs should be
looking at these levels once or twice a year anyway. If they give you any grief about doing the testing, maybe
you should look at another radio shop. Some shops care and other shops only hold their hand out looking to
be paid. Fixing the radios is secondary to them.
The hard facts of life is the quality of the field radio tech has slipped way down over the last 5 years or so.
With the economy the way it is these days, I would think the owner of any radio shop would care about
the work his employees are doing. If the customer is not happy, his shop won't last long.
Jim
with some audio test equipment to point the finger.
With that said, what I have found in traveling around the country, is that many radio techs just don't know
how to set up the audio on radio systems or just don't give a damn. I have seen audio levels as low as a
neg 30 db for the normal audio and as high as a plus 10 db. These audio levels need to be adjusted to
standard levels before anything can be done about just what your talking about. Both the RX level leaving
the radios going to the consoles and the TX levels arriving at the radios. If your using leased telephone
lines, the phone company gets upset if your levels are too high. It causes problems in their equipment
as well as causes cross talk.
There have been a good number of threads on adjusting audio levels on remote controlled radios. A search
will pull up most of the discussions.
Now that I have shot off my mouth about audio levels in and out of the radios, the consoles do have a good
deal of gain and AGC to compensate for low or high RX audio levels. The AGC doesn't do anything for the
audio levels being patched. There is some level control on the BIM cards, but the real issue is probably in
the way the radio tech has set the levels up coming out of and into the radios.
To actually point the finger to where the problem is, will require someone to put a meter on the BIM card input
from the radio RX audio and see what level it is at. If it isn't at least a negative 10 db, then the radio tech
needs to resolve the problem. The radio tech also needs to measure the TX audio leaving the BIM card and
make sure it is at the correct level.
You could have multiple issues causing the problem your talking about. Without going through each and every
radio channel on your console, you might end up with other issues with low or high audio. The radio techs should be
looking at these levels once or twice a year anyway. If they give you any grief about doing the testing, maybe
you should look at another radio shop. Some shops care and other shops only hold their hand out looking to
be paid. Fixing the radios is secondary to them.
The hard facts of life is the quality of the field radio tech has slipped way down over the last 5 years or so.
With the economy the way it is these days, I would think the owner of any radio shop would care about
the work his employees are doing. If the customer is not happy, his shop won't last long.
Jim
ebringman wrote:The consol is used as a gateway between a VHF repeater system and a 800 trunked P25 system, when a VHF mobile talks the audio to the 800 mobile sounds low but it sounds OK to the dispatcher and other mobiles. When the dispatcher tx the audio is loud so muschso that the 800 mob is turned down making the problem worse between the VHF and 800. RX evels from the VHF system are in the normal range, some moble operaters have a problem with how far they talk from the mic, but any normal communication are in the -10 to 0 range.
I was though that the patch audio was on the tdm bus from on BIM to the other so is there an adjust ment jumper or something to boost the patch level?
Edgar
Re: CCII Gold Elite patch audio
I agree with Jim. It goes back to basics. AGC is compensating for low rx levels allowing the dispatchers to hear the channel, but are revealed in the crosspatch. Time for end to end testing to get all levels into an acceptable range. Or buy DLM modules for every line. I have several systems with numerous users with bad mic technique. A DLM fixes them, but gets expensive when applied to a regional trunking system.