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Repeater for Motorola DTR/DLR radios


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#1 n1das

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Posted 14 February 2021 - 09:00 PM

Cane Wireless sells a range extender / repeater for Motorola DTR and DLR radios.
 
Cane Wireless DRX Range Extender for Motorola DTR/DLR radios:
 
The DRX is not a repeater in the conventional sense like a GMRS repeater.  The DRX range extender / repeater consists of a pair of DLR radios running custom firmware and connected together to behave as a repeater or range extender.  Simply connecting a pair of stock DLRs or DTRs together will not work.  The two DRX units that make up the repeater are placed physically apart from each other and connected together with a cable.  The DRX (1 pair of units) repeats a single Public group, Private Group, or Profile ID group. IOW, it repeats 1 channel in a DTR or DLR radio.  When dealing with multiple channels, one DRX (1 pair of units) is required for each channel to be repeated.
 
Strategic placement of a pair of units making up a DRX is critical.  The application for the DRX is to extend coverage inside large buildings or to fill in dead spots in coverage areas.  It isn't something you would normally place at a mountaintop site, although it would be interesting to try.  Placement of units requires there  to be some overlap between the original coverage area and the desired extended coverage area.  A typical application is to provide coverage through a firewall in a building blocking coverage and you would place a unit on each side of the wall.  In tall buildings, the DRX could be used to extend floors of coverage inside the building.
 
Cane Wireless also sells a weatherproof kit for the DRX:

David Sterrett, N1DAS

Nashua, NH, USA

Ham [HA] = N1DAS (2/1984)

GMRS [ZA] = KAE9013 (12/1992)

 


#2 axorlov

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Posted 14 February 2021 - 09:20 PM

That's something I had lingering in my mind after reading your links and studying DTR/DLR thing. I'll leave hacking for some time later.

 

The first thing (ok, second) is of course, to plug in simplex repeater and bring the whole contraption high up on a makeshift mast. That's could be a lot of fun, I already see it.


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- Alex


#3 n1das

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Posted 14 February 2021 - 09:33 PM

That's something I had lingering in my mind after reading your links and studying DTR/DLR thing. I'll leave hacking for some time later.

 

The first thing (ok, second) is of course, to plug in simplex repeater and bring the whole contraption high up on a makeshift mast. That's could be a lot of fun, I already see it.

 

It IS interesting and I don't know if it repeats on the same frequency hopset or not.  I don't know the details of how it works.  It would be interesting and cool to try but I don't feel like spending the $,$$$$.$$ for a DRX.

 

I think the cable that comes with the DRX for connecting the two units together is 10 ft or 20 ft long.  There is an optional 50 ft cable for it to get the two units further apart.

 

The current DRX based on a pair of DLRs is a refresh of their older DRX unit which was based on a pair of legacy DTRs and with the same price tag. The legacy DTR410/550/650 models were discontinued in November 2018 when the DTR600/700 models were released.  Cane Wireless needed to develop a DLR based DRX going forward.  The DRX also needs to work with the Profile ID mode channels which the legacy DTRs can't do because they don't have the 4 digit PIN feature.

 

From what I read about the DRX is that the digital audio delay between radios approximately doubles when talking through the DRX.  Multiple DRXs on the same channel can be used to further extend coverage on a channel but Cane Wireless recommends against it because the audio delay increases and audio quality may decrease.  This makes me wonder if analog audio passes between the two units making up a DRX repeater.  The audio quality would decrease due to effects of double vocoding, etc.


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David Sterrett, N1DAS

Nashua, NH, USA

Ham [HA] = N1DAS (2/1984)

GMRS [ZA] = KAE9013 (12/1992)

 





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