Batboard

I am need of the proper tuning of the Motorola Spectra-Tac voter. I need to know what the Db should read from each site to get the best quality and insure each module votes correctly. I know very little about this unit so any help would be appreciated.

2175Hz Status Toneshould be a -23dB and 1KHz tone sent from the far end should hit the voter at -10dB.

Its not quite that simple.
1. The most important thing is good flat phone lines, your loss on each line should be equal or close (<3db) @ 400 hertz, 1k, and 2175. If not, call the phone co and complain till they are. This is because each sqm has an agc circuit in it, the gain of that circuit is determined by the status tone level.
2. Status tone leaving each receiver needs to be -13db from the level of voice peaks. This is important because of the agc in the sqm. Inject a full quieting 1k tone at full system deviation into the receiver, adjust the output to 0db. Now turn off the signal generator and set your status tone for -13db.
3. @ the comparitor each site's status tone should be resonably close in level, but if its a little off the agc will take care of it.
If your lines are a little more lossy at the 2175 freq, most receivers have a way to boost high level tones to compensate. Again the -13db seperation needs to be present at the comparitor.
4. If you have 10db phone lines, the levels at the voter should be what KS4VT said if they are -16db lines they should be -29db and -16db

Hope that helps.

Thanks, I will give it a try and see what happens.

It's really not all that difficult to set up provided you have the correct test equipment. The information that Batwings21 gave you is 100% accurate.

For those reading this thread that have never worked on voting equipment before, or who are wondering what the proper tools to use to work on it are, read on.

Aligning voting systems requires the use of a Transmission Impairment Measuring Set (TIMS), as it's an invaluable tool in aligning wireline circuits, be they over telco or microwave/RF. I'm sure those who work on this equipment will agree with me. If you don't have one, you can generally find them on eBay fairly regularly. On our bench, we use a Hewlett-Packard 4945A, but it's a rather bulky instrument and not well suited to field use. In the field, I personally recommend the Hewlett-Packard 4935A.

These are great tools, and you can use them for other things like setting Centracom BIM outputs, monitoring audio outputs of devices (audio amplifier), and a host of other things.