Single Frequency Repeater

[fireradio]

I am just dipping my toe into the DMR waters, and I am extremely interested in the new "Single Frequency Repeater" (SFR) functionality offered by Hytera's PD982. This feature alone is making me consider heavily investing in Hytera for the "fleet" of radios I'm attempting to assemble. Has anyone had a chance to play with it?

I'm told that the PD982 is the only radio that offers this functionality, and that it is unlikely it will be included in any Hyetra mobiles, which is a real shame, because a mobile with this feature would be so perfect for my use case.

I'm also told that most other Hytera radios can utilize the PD982's repeater, has this been verified? I would only be able to afford one 982, so I need to make sure that the lower-tier radios, like the 362 and 682 would be able to use the SFR function.

I assume the SFR can pass encryption?

I have been dreaming of a low power, easily configurable and field-deployable DMR repeater for a while, and this feature is darn near perfect. Frequency agile - you can set up the repeater on any frequency you desire, and you never have to worry about tuning a duplexer! Brilliant!

Also, I haven't been able to find any "battery eliminators" for the PD982, which would be something I would like if I'm going to have the radio operating as a repeater for many hours so I can plug it into a DC power source rather than relying on the battery. Any leads?

Thanks!

 

[speedway_navigator]

I have used both PD682 and BD502 radios through a PD982 in SFR mode.
I will try encryption on Friday and get back with results, stay tuned.

I removed the antennas from the radios to verify they could not talk simplex and then turned on SFR and passed traffic both ways. I walked back towards the 982 so the radios could talk simplex but never heard any signal degradation like you would expect in analog mode with 2 RF signals hitting one radio. I don't know how the SFR works in that mode.

 

[speedway_navigator]

10 digit encrypted signals passed through the PD982 SFR, the 982 did not decode the audio.

 

[n1das]

I own a few PD982-Ux radios. Great radio! How expensive is the license key to enable the feature? Is it per radio or does it cover multiple PD982 radios?

 

[jeatock]

Okay, I'm confused. Is this a very fast time-based switching between RX and TX? Would add to latency, but would work.

Radio isn't magic; simultaneous TX and RX can't work on the same freq in a very-near-field environment.

 

[speedway_navigator]

>>Okay, I'm confused.

This is only in DMR mode. Radio A xmts on slot 1, B is too far away to RX.
The 982 in SFR mode receives on slot 1 and repeats the same voice or data packet on slot 2.
B hears / decodes the traffic on slot 2.

Even if B comes into simplex range of A it does not act like an analog radio would with 2 signals
on the same freq, it keeps using the slot it heard first, so it still decodes slot 2 even though both slots have the same info.
If C was in simplex range of A it would RX on slot 1 even if it was also in range of the SFR.

I did a youtube video showing how this works but am having problems over dubbing the audio.
This is my first video so I have a learning curve with windows movie maker.
I hope to get it posted early this week.

Unication had something like this at APCO in Anaheim a few years ago but I never heard more about it.
They were waiting on FCC approval, maybe that never happened.

 

[speedway_navigator]

@n1das - check PM

 

[slicerwizard]

Okay, I'm confused. Is this a very fast time-based switching between RX and TX? Would add to latency, but would work.

DMR already has latency. This adds none.

 

[speedway_navigator]

PD982 single frequency repeater video

https://youtu.be/gHRXMVr2JsI

 

[Your_account]

Does anyone tried the PD985? I could not find many information online.