SPECTRATAC INPROPER VOTING

[JMINN]

I have a Spectratac voting system consisting of an MTR2000 and two Spectratac voting recievers. The comparator is located with the MTR2000 and its receiver is connected to the comparator through the QRN8498C filter. The problem I am having is that one of the remote Spectratac rec. is consistently voted even though one of the other receivers has a better signal. I have set the line levels of all three rec. to be 0db as measured at the monitor audio terminals on the comparator. I suspect that the amps on the fiber optic phone lines may be compressing the audio messing up the signal to noise ratio. Has anyone else had this problem. All help will be appreciated.

Thanks

Joe

[Bruce1807]

We had problems with a noisy line always winning the vote.
Listen with a butt set on the spazatac and see if one is noisy.

[Batwings21]

Are you going over phone company fiber? If so what level is your status tone leaving the receive sites at? We use the standard 2175hz tone at -13db in relation to average voice, which is normally set at -3. Around here it is never a good idea to hit a phone line at higher than -3 it can do weird things. If you are using the -13 separation that is also important,if it is off, it can cause your symptoms.

[N4DES]

First thing you need to do is to sweep the phone lines from 500 Hz to 3,000 Hz in 100 Hz increments and make note of the losses on the voter side. Once you document it you want to use the SpectraTAC equalization jumpers on the Audio Control Board to make the levels across the phone lines as flat as possible.

The audio levels at the back of the voter should be -10dbm for voice peaks and -23dbm +/- 2db for the status tones.
Also remember that you need to add an additional 10db attenuation for the on-site receiver so the voter sees it like the distant receiver sites.

Mark