Jed: I have worked on voting systems from as little as 2 receivers to as many as 36 receivers in a public safety system. The best routing of the voted audio is by fiber optic cable, then microwave, then RF point to point link and lastly and the cheapest by telephone line. If you are using telephone line, be sure all lines are close together in frequency response and time delay characteristics. If not request the telephone company condition the circuits to be close as possible. Also, the newer voters have automatic line leveling circuits built in. These typically work by using the 1950 Hz no signal tone as a reference. Your efforts in adjusting the line send and receive levels is very important to the satisfactory operation of the complete system. Keep the knob twiddlers out!
Fred W5VAY _____ From: [email protected] [mailto:[email protected]] On Behalf Of Charles Miller Sent: Tuesday, June 08, 2010 1:12 AM To: [email protected] Subject: RE: [Repeater-Builder] voting receivers Jed, The receivers are probable AstroTac receivers. Same as the Quantar, just packaged a little different. The receiver is just what you think. A receiver on the same RX frequency. The unit has a 2 wire and 4 wire output, but only uses the 2 wire for most applications. The unit puts out a tone when in non receive mode, this is called the guard tone. This guard tone goes away when a valid receive signal is received. The received signals audio is then sent out this 2 wire circuit. This circuit takes the received audio from the receiver to the voter and can be many different types, but normally is a phone circuit. The signals come in the voter thru the SQM modules, one for each receiver. This SQM module detects the guard tone and mutes the output to the voter command module. When the guard tone is absent the SQM module measures the signal to noise ratio of the received signal. If more than one signal is being received by the voter the command module picks the best signal and routes it to the output circuit of the voter. The command module is the brains to the unit. The simple explanation. I hope this helps. If you have any more question don't wait to ask. There are many on this list that can help. Charles Miller -----Original Message----- From: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Jed Barton Sent: Monday, June 07, 2010 11:31 PM To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> Subject: [Repeater-Builder] voting receivers Hey guys, Alright, i've just been giving the responsibility of being the head contact for a commercial repeater, and pretty much in charge of it. It's a damn good machine, a quantar. The one thing i'm not the best at is voting receivers. They only have 2 of them. Here are a few questions, how are they usually connected, i take it there isn't a lot to it, but just trying to learn more about voting receivers. Thanks, Jed ------------------------------------ Yahoo! Groups Links
