KAIROS Repeaters, DMR or P25

[kd4efm]

Just wanted to put this out that the KAIROS repeaters can be ordered with P25 Phase 1 Conventional.

List:
KA160/450/500; 4247.00 (VHF/UHF 400-450 or 450-520)
KA-P25; 4853.00





Contact your dealer for more information.

 

[wd8chl]

fwiw, we've got 3 systems that have been on the air for almost a year now, 1 VHF and 2 UHF, all
simulcast. The UHF ones are running mixed mode, but the depts are analog, the VHF is 7 sites P25 only. UHF is running well, VHF is having issues that we're trying to figure out. Might be network based...

 

[AF1UD]

I'm interested in these.

With DMR Tier 2, how would analog work? You can have two conversations at once plus Analog?

 

[nd5y]

It is impossible to have digital and analog transmissions simultaneously on any mixed mode repeater (DMR, NXDN or P25). An analog transmission occupies the repeater and prevents digital transmissions. It is impossible to have time slots for analog signals.

 

[mmckenna]

I'm interested in these.

With DMR Tier 2, how would analog work? You can have two conversations at once plus Analog?

Mixed mode just means it'll run in either mode. Not both at the same time.

If it hears an analog transmission, it'll repeat in analog.
If it hears a DMR transmission, it'll repeat in DMR

 

[otobmark]

In p25 does the kairos just pass P25 or does it receive and reform data before Tx, similar to what Motorola repeaters do?

 

[Project25_MASTR]

In p25 does the kairos just pass P25 or does it receive and reform data before Tx, similar to what Motorola repeaters do?

Define receive and reform?

 

[otobmark]

it re-generates the digital signal instead of pass through. The result is a clean correctly formatted and timed signal out. Decode/recode.

 

[RFI-EMI-GUY]

Is Kairos offering receive diversity in all modes?

 

[Project25_MASTR]

it re-generates the digital signal instead of pass through. The result is a clean correctly formatted and timed signal out. Decode/recode.

Who's P25 repeater doesn't do that? All compliant P25 repeaters should demodulate the received signal into its serial bitstream and then modulate it for transmission again.

 

[KevinC]

Who's P25 repeater doesn't do that? All compliant P25 repeaters should demodulate the received signal into its serial bitstream and then modulate it for transmission again.

I don’t believe a Quantar does.

 

[Project25_MASTR]

I don’t believe a Quantar does.

If it didn't you wouldn't be able to perform NAC translations (which you can do on a Quantar and GTR8000).

I think the question is more or less does it perform FEC between the receive and transmit stages which I don't exactly know without deep diving into the Theory of Op sections of the Quantar and GTR8000 service manuals.

 

[kd4efm]

So, last week I got to play with the Kairos repeaters during tech training in Atlanta. Pretty slick how it works with simulcast on analog, P25, or DMR.
There is OPTIONAL SOFT DIVERSITY Reception.

The Kairos is also compatible with the KAS-20 using a DMR voice path for analog, that was a new one for me.
Anyway, the test racks they had us work on had all 3 modes active and those as anything else work in FIFO.
No transposing of 1 input to a different output. Analog to Analog, DMR to DMR, or P25 to P25. even with simulcast.

 

[Project25_MASTR]

So, last week I got to play with the Kairos repeaters during tech training in Atlanta. Pretty slick how it works with simulcast on analog, P25, or DMR.
There is OPTIONAL SOFT DIVERSITY Reception.

The Kairos is also compatible with the KAS-20 using a DMR voice path for analog, that was a new one for me.
Anyway, the test racks they had us work on had all 3 modes active and those as anything else work in FIFO.
No transposing of 1 input to a different output. Analog to Analog, DMR to DMR, or P25 to P25. even with simulcast.

Which Kairos repeater, the first gen or second gen?

 

[buddrousa]

We have 2 Kairos VHF in Mixed Mode Analog DMR running in 2 site Simulcast Analog right now until all the DMR equipment is operational these are about 6 months old. With field units of NX-5200 and NX-5700 units only.

 

[wd8chl]

Fwiw, it seems the issues we had with the VHF P25 simulcast were pretty much fixed with a FW change. Works pretty well now.

 

[smosier3106]

fwiw, we've got 3 systems that have been on the air for almost a year now, 1 VHF and 2 UHF, all
simulcast. The UHF ones are running mixed mode, but the depts are analog, the VHF is 7 sites P25 only. UHF is running well, VHF is having issues that we're trying to figure out. Might be network based...

We're you ever able to get your issues resolved? We've had one simulcast VHF system that we've had all kinds of trouble with

 

[wd8chl]

We're you ever able to get your issues resolved? We've had one simulcast VHF system that we've had all kinds of trouble with

Yeah, firmware was the main fix.

 

[AF1UD]

What would be a real world application for one of these with mixed mode? Help to transition over to digital?...

 

[mmckenna]

What would be a real world application for one of these with mixed mode? Help to transition over to digital?...

Yeah, good when transitioning. Or, if you've got multiple groups using the repeater (community repeater), you can have some on analog, some on digital, depending on the needs.