Batboard

Looking for assistance in determining the correct jumper placement on the wireline control board to increase the 4 wire audio from the dispatch console. In researching the Quantar manual, specifically the wireline control module section, it appears there are two groups of four jumpers each that can be set to increase the audio from the dispatch console. The console audio to the wireline control board is transported on a 4 wire leased teleco. line and the dispatcher's audio is very low. The teleco line has been checked and the console audio output turned up to the max point with unsuccesful results. I am at the point that I don't believe our radio service vendor ever did optimize the Quantar upon installation. In looking at the wireline control documentation, it appears that if the impedance on the wireline control board is increased, I should anticipate an increase in wireline audio. Am I correct on my thought process here?? Also, other than make sure the Quantar is powered down, is there any thing else I need to be aware of when I pull the wireline control board?

P.S. transmit deviation was check and appeared ok.

Thanks for any insight.

First you should make sure that the levels are correct. Most leased lines are 10db loss lines. You should be supplying 0db from the console and expecting -10 at the base station.

This is what we run from our microwave mux channel banks and as far as I know the quantars have default levels and work fine. We could easily run lossless but we try to mantain telco compatability.

Unless you have a way to measure the audio levels on the output of the console and the telephone line level
at the radio, best tread carefully here. First of all the phone company gets upset if you start hitting their
lines with too hot of audio. Remember that no more than zero db should be sent out from the console.

If your using tone remote control, the idle tone that keeps the transmitter keyed, should be at a neg 20 db.
In my travels around the country, I have found this level to be almost any setting you can imagine. Seems
as most of the radio techs never bother setting this and just go with if it works, the level must be good.
Not sure if they even have a way of measuring the audio level on the phone line. That may be why so
many radio systems sort of work depending on how the weather is that day.

Problem is that most of the radio tone remote control adapter boards in the radio's only work down to
about a neg 40 db. If you have a 10 db loss in the telephone company line amp settings, that only
gives you 10 db to play with, before the radio keying gets flaky.

In your case, you said the transmitter deviation level measured OK. So why are you asking how to
change the settings? I must be missing something here in your question. If your saying the
dispatcher audio is low, yet the transmitter deviation was checked and appeared OK, something
doesn't compute here.

Jim

bbrantner wrote:Looking for assistance in determining the correct jumper placement on the wireline control board to increase the 4 wire audio from the dispatch console. In researching the Quantar manual, specifically the wireline control module section, it appears there are two groups of four jumpers each that can be set to increase the audio from the dispatch console. The console audio to the wireline control board is transported on a 4 wire leased teleco. line and the dispatcher's audio is very low. The teleco line has been checked and the console audio output turned up to the max point with unsuccesful results. I am at the point that I don't believe our radio service vendor ever did optimize the Quantar upon installation. In looking at the wireline control documentation, it appears that if the impedance on the wireline control board is increased, I should anticipate an increase in wireline audio. Am I correct on my thought process here?? Also, other than make sure the Quantar is powered down, is there any thing else I need to be aware of when I pull the wireline control board?

P.S. transmit deviation was check and appeared ok.

Thanks for any insight.

The line impedance jumpers are intended to allow the installation to match the type of circuit provided - either 600 or 900 ohms. They are not intended to "increase the audio from the dispatch console". Even if not matched to the line there will be minimal effect on the transmit audio level.

The station transmit wireline has a wide adjustment range. 60% of system peak deviation [average voice level] can be set for anywhere from 0 dBm down to -35 dBm. This is supposed to be accomplished by the installer using the Tx wireline alignment procedure in the RSS.