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Repeater Mode
- Thread starter nyscan
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N6ML
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I don't know the protocols well enough to explain exactly why, but you should check that box when the convention frequency a repeater output. If it's not checked, I believe you'll only hear talkaround traffic on the frequency. This pertains to both P25 (Conventional) and DMR.
I can't comment on P25 but for DMR you would need to enable repeater mode to listen to repeaters and disable it to listen to simplex. They are different protocols. I'm really not sure if P25 works the same way but DMR definitely does.
boatbod
Member
DMR uses different sync bursts for BS (base station) vs MS (mobile station).
In the commercial world, this is mostly a "behind the scenes" thing. The Motorola software took care of it automatically when you entered a simplex frequency. When the Chinese DMR radios started coming out there was an explicit option for either Repeater or "Direct" mode that stumped many people setting up their radios to work with simplex hotspots. They assumed it should be in repeater mode and didn't have good results. No results actually. Enabling direct fixed that. Even D-STAR had a similar carrot. Hotspots connected to a gateway (which originally was made for repeaters) would only respond to radios with a simplex frequency AND a +or - offset tricking the radio into duplex mode.
DMR and I assume P25 by the sounds of it but I haven't tested that yet.
What do you mean by conventional? Non trunked?
nyscan
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Yes.
I'm not sure about P25. But for DMR you would need to pick Repeater mode unless you are listening to a simplex frequency.
N6ML
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The "Repeater Mode" option is only available for P25 and DMR, not for "analog" conventional (at least in PPS 0.3.14)
● Repeater Mode
● Repeater Mode
- Definition
Each Selective Call/Monitor Mode channel can be set in repeater mode or talkaround mode. - Options
1. Disable - Talkaround Mode (Default)
2. Enable - Repeater Mode - Note
This feature is avaliable in digital(P25 Conventional & DMR) channel.
nyscan
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- Yes. That is correct. The help section doesn't do much to elaborate. Still wondering how it matters whether the traffic on a particular frequency is coming from a repeater or a handheld radio?
They each handle the data differently is the easiest way I can explain it. Direct mode (between two portables) and repeated mode are different formats, but it's all still called DMR.
This Repeater Mode business must have to do with time slots, correct? Thinking out loud here, if repeater mode applies to p25 it should only apply to p25 Phase II, because it alone is TDMA. P25 Phase I does not work with time slots as I understand it, so repeater mode should not be needed for Phase I. Yay? Nay?
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Yay...in my opinion.
nyscan
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Just to revisit this...Repeater Mode checkoff box is available with P25 Conv and DMR. I don't currently have any DMR channels programmed but I do have some P25 Conventionals. I am not seeing any difference between having the box checked or not with the P25 Conventionals. Does anyone have different results?
Only on DMR , no difference on P25 Conv
boatbod
Member
DMR uses different frame sync ids for TDMA direct mode compared to BS (base station) mode. P25 uses a single frame sync value for Phase 1 (FDMA) and a single different frame sync for Phase 2 (TDMA) regardless of whether the traffic is Conventional or Trunked.
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