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Answers to Your Questions about Radio and Wireless Voice Communications

Hytera PD985 Handheld On-Channel Repeater

Aaron Ward
21 November 2014

PD985 Hand-held On-Channel Repeater

Double the range of your Hytera radio system just by adding one PD985 radio. Ideal for Security, Close Protection and mobile events where installing even a temporary conventional repeater is neither practical or feasible.

The Hytera PD985 is a unique game-changing radio technology because not only will it function the same as any handheld radio but it can also function as a repeater increasing range of existing simple back to back radios system, perhaps more than doubling range depending on how or where it is deployed.

How does it work?
Most existing Hytera PD5, PD6, PD7 and X series digital radios use Pseudo Trunk, the capacity to make two simultaneous calls on a single radio channel. These calls are transmitted alternately in time on two different time ‘Slots’. A free (unused) slot is picked by the transmitting radio and receiving radios will respond to the first active slot.


The PD985 takes advantage of these two Slots receiving on one slot and transmitting the same traffic on the other slot simultaneously. This functions pretty much like a conventional repeater except that only one frequency (radio channel) is used.


Example of the two possible coverage scenarios.

Two radios out of range of each other but in range of the RD985

  1. Radio A transmits on Slot 1
  2. The RD985 receives radio A on Slot 1 and transmits this traffic on Slot 2.
  3. Slot 2 is picked up by Radio B



Two radios out in range of each other and in range of the RD985

  1. Radio A transmits on Slot 1
  2. Radio B receives radio A on Slot 1
  3. RD985 receives radio A on Slot 1 and transmits this traffic on Slot 2

 

 

 

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