Section 3
Operation
Reserve Mode
If the user is in the reserve mode when unkeying, a "chirp" is sent. This chirp gives a positive indication of active reserve mode.
Courtesy Tone
The ZR310 will next check to see if the user requires the courtesy beep. If so, then it sends the beep one second after the transmit radio unkeys. The beep frequency can be sent from 400 to 2500 Hz (default setting is 1000 Hz). If the user is a 400 Hz tone just after the GR300 unkeys, potential failure has been detected.
Barge In (Privacy Mode)
Finally, the ZR310 continues checking for TPL/DPL. If the last user is set for "privacy mode", then no other users will be allowed on the system until the transmit hold time (repeater "tail") expires.
Repeater Hang Time
The programmable repeater "tail" or transmit hold timer is adjustable from 0.0 to 25.0 seconds. When the user radio unkeys, the ZR310 begins monitoring for valid TPL/DPL tones to be received. If a valid user is not detected within a specified timeout period, the IPL decode shuts off or the DPL turn off code is sent (if it was previously on). After a 0.2 second delay, the transmit radio PTT is dropped. This method removes the second squelch tail heard by the mobiles when the user radio unkeys.
Encode During Transmit Hold Time
When a valid user unkeys, the TPL or DPL encode may be left on or turned off during the transmit hold time. This feature is programmable for each user. When using a control station phone patch through the repeater, you should turn off the encode during transmit hold. Turning off the encode allows the phone patch to distinguish whether the mobile has unkeyed or the repeater has dropped off the channel. When using the repeater for dispatch only, you may leave the encode on during the transmit hold time to keep the mobile decoders open. This feature eliminates the decode delay observed in the mobile between transmissions.
Stuck Mic Timeout Timer
While the Gm300 mobile radios are conversing through the repeater, a timeout is running. If a mobile does not unkey within the time period, double beeps are sent, and the transmit radio PTT is dropped.
Anti-Kerchunker Filter
The
Accessory PTT Encode
An Accessory device such as a tone remote or local microphone may key the transmit radio, and take over control of the repeater. The accessory may need the ZR310 to encode a particular TPL tone or DPL code in order to communicate with a specific user group. The ZR310 includes a programmable "Accessory PTT" encode setting to accomplish this function. Whenever an accessory keys the transmit radio, the ZR310 disables the repeater transmit hold time until 30 seconds of "no accessory transmit" has expired.
March, 1993 | Section |