Radio ‐Based Vote Scan for IDAS F3161/F5061 Series Radios

 

Note:

This is not related to repeater‐based voting in IDAS Multi Site Conventional repeaters, although it can be used with a multi‐site conventional repeater system.

 

Radio Voting Overview

The Voting feature expands yours communication coverage area by using multiple repeaters, allowing the users radio to move from one repeater’s coverage to another repeater’s coverage, automatically selecting the best channel.  Vote Scan can be configured as Fast Vote Scan or as General Voting (without Fast Vote).

 

Fast Vote Scan

When enabled, the radio begins to search the frequencies in the zone assigned as Vote Scan. As it encounters busy frequencies in its list, it measures the RSSI of these signals. If any signal meets or exceeds the RSSI level that is set in the Fast Vote Level setting, the vote scan ends and the radio stays on that channel until the signal drops below the Re Vote L0 setting.

When (or if) the signal on that channel drops below the Re Vote L0 setting, the voting sequence begins again. In theory, the radio does not have to examine all the frequencies in the list to find an acceptable channel. If no channel is found that meets or exceeds the Fast Vote Level, the radio uses the General Voting (non ‐Fast Vote).

 

General Voting (without Fast Vote)

When you switch the radio to the Vote Scan zone, the Voting sequence starts. Each channel is examined, and if there is a signal present, the radio measures the RSSI level. If the signal is stronger than the Vote L2 Level, then the radio stores the RSSI level. The radio then goes to the next channel, and etc., until all channels have been examined. Once all the channel RSSI values have been stored, the radio selects the highest RSSI, as long as it is greater the Vote L2 Level. If no RSSI level is greater than the Vote L2 Level, the scan sequence will continue.

 

In the programming menu, go to Memory "CH > Zone Operation".

Under the column "Zone Type", change it to "Voting".

 

Now go and build a Zone to place all the channels you are going to use for voting.

 

 

Next go to LMR > SCAN > Scan Settings.

 

Set the following:

Watch (Sec) = 5.00

Watch Unmatched (Sec) = 5.00

Resume (Sec) = 3.00

Talk Back  (sec) = 10.00

Fast Scan (Sec) = 0.030

Slow Scan (Sec) = 0.200

Notes:

Set Fast Scan to 0.030. This is the speed at which the scan goes from channel to channel if there is no signal present.

Set Slow Scan to 0.200. This is the speed at which the radio stays on a channel with a Frame Sync (a digital signal) to verify RAN tones.

 

Next we go to "LMR > SCAN > Vote Setting".

Set the following:

Vote lead in delay (Sec) = 0.050

Vote Dwell (Sec)  0.030

Re-Vote Dwell (Sec) = 5.00

PTT Side Tone Delay (Vote) (Sec) = 0.00

Vote RSSI (Sec) = 20

Check before RSSI = Digital (On)

Set Vote Lead In Delay to 0.050 sec. This is the time period between detection of a signal and the RSSI level analysis. This is a wait period to allow a stable signal.

Set Vote Dwell to 0.030 sec. The time actually required to measure the RSSI level.

Set ReVote Dwell to 5.0 sec. The time period between Vote cycles (customer preference)

Set Vote RSSI to 20 sec. This gives the radio time to remember all channels beacon in a worsecase scenario. In this example, 3 channels are at 5 second beacon intervals 5X3=15 (rounded up to 20). In the ham bands, if you are using beaconing repeaters and the repeaters beacon once every 60 seconds, with 3 repeaters in your area, you would set this to 61 Sec.

Set Check Before RSSI to one of the following per customer requirements:

  • Off - Set for Analog Frequency-only detection
  • Digital - Set for digital Frequency-Only detection
  • C.Tone or RAN - Set when a RAN or Tone is required to filter out matching frequencies with different RAN/Tones.

Set the following:

Fast-Vote Level (dBm) = -100

Vote (L2) Level (dBm) = -114

Re-Vote (L0) Level (dBm) = -118

Check before RSSI = Digital

If Fast Vote is turned “On”, set Fast Vote Level to customer preference. If signal is seen that exceeds this

level, the radio stops on this channel and terminates Vote until signal gets weaker than ReVote L0 Level.

Set Vote L2 Level to 114. During General Voting, any signals stronger than Vote L2 Level will be memorized for the voting decision . The highest signal that is higher than 114 by default will be chosen as the channel to monitor. If all signals are weaker than 114, the voting will continue.

Set ReVote L0 Level to 118. Any time a radio has stopped to monitor a channel after voting, the signal strength is continuously measured. If the signal stays stronger than 118, the radio doesn’t resume

voting. If the signal gets weaker than 118 for a period in excess of the Vote Dwell Time (5 seconds in this example), the radio starts the Voting cycle again.

 

   .