Newbie here, for our business we are using DTR 650's and wanted to see if it is possible to build a repeater and/or use mobile setup that would work with the DTR's and what models would be ideal. I know the DTR's use FHSS and likely the private feature of the DTR wouldn't work with other mobile radios. I've been looking into 900mhz versions of Motorola XTL2500, Kenwood TK 981, etc to see if and how it can be done.
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DTR 650 to Repeater
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DTR is radio to radio only. And only other DTR’s will talk to a DTR.
RFI-EMI-GUY
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A parrot repeater set up should work with the DTR, however it will likely have poor sounding audio. As far as mobile, a 900 MHz mobile amplifier might work. However for some strange reasons these radios don't benefit at all from antenna improvements, so there seems to be some mystery in that respect, impedance or some Motorola trickery.
There are "repeaters" for DTR radios. Here's one: Cane Wireless - DRX digital repeater
Likely just the guts of 2 DTR radios, but I don't know. There was another model as well, but I can't seem to locate it.
Likely just the guts of 2 DTR radios, but I don't know. There was another model as well, but I can't seem to locate it.
mmckenna
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Won't work.
They FAR exceed the power output limitations of the radio service. They also won't cover the Part 15 band these DTR radios operate on without lots of modifications, but then they still won't work because neither radio will do Frequency Hopping Spread Spectrum.
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Part 97 is secondary in the 900 MHz ISM band so power limits are increased. The FHSS should not be a problem as it is permissible and not encryption. The problems remain as to interfacing the DTR to a power amp like Spectra 35 Watt. The TR switching needs to be worked out. The lack of schematics for DTR is a problem.
mmckenna
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Good point, but without the ham license, no dice.
Part of the 2.4GHz WiFi band is covered by amateur, and I had a coworker that set up a WiFi link at his property on one of the WiFi channels that falls under Part 97 and bumped up the power. Worked well.
I agree, getting the RF amp in the radio to react to that switching would be the real challenge.
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If the DTR has constant envelope TX , no TDMA going on, it may only require sensing the RX TX switch in the DTR chassis and use to perform same at the PA module eith PIN diodes. Just gut a Spectra Chassis and use the PA and some perf board for power control and TX/RX logic.
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