GB7VT

Single Frequency Repeater

  • Repeater output: 431.1750MHz

    • TimeSlot: 2

  • Repeater Input:    431.1750MHz

    • TimeSlot: 1

  • DMR:

    • DMO-R mode or Psreudo trunk

  • Colour code: 5

  • Connectivity: TBA

  • Repeater 25 watts ERP

20/03/2019

First Switch On. No networking at this stage, standalone operation.

13/03/2019

Licensed today, time to get a move on, I was not expecting MOD/Ofcom to be this quick with the paperwork!

02/03/2019

 

An application has been submitted to the ETCC for a Single Frequency Repeater (SFR) for the Stoke-on-Trent area, co-located with GB7SI.

Radio users wishing to use this repeater will need to configure the DMR terminal to monitor both time-slots whilst in DMO mode, on some terminals this is called pseudo trunk.

Not all brands of radios may work (MD380 type radios to be tested), if you are using a professional radio; Motorola, Hytera, Simoco Tait, upgrade to the latest firmware. You may require an additional license from your radio manufacturer to active this optional feature in the terminal.

See below for further information;

Same frequency TX and RX?

In the world of DMR it is possible to operate a DMR radio terminal via a single frequency repeater known as a SFR. 

 

How can this be possible? 

You have two time-slots in a single 12.5KHz space, means it is possible to operate a DMR radio terminal as a single frequency repeater. 

Voice or data information is received in DMO mode on the first time-slot by the SFR and is re-transmitted on the second time-slot (90ms) almost simultaneously.

SFR enables the range of a direct link between conventional DMR devices in DMO mode to be extended without having to use a standard base station or repeater or change frequency. This gives the radio user greater coverage using just a single simplex 12.5KHz channel.

Radios wishing to communicate via a SFR will have to be pre-configured as follows

Peter Leach

© 2015 G8NSS

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