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Thread: The Motorola DTR is dead... long live the DTR...

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    Default The Motorola DTR is dead... long live the DTR...

    Looks like Motorola is trying to breathe some new life into their aging DTR/DLR line of radios. Looks like an ISM version of their TETRA handsets...

    https://www.radiotwoway.com/32688-mo...l-radio-900mhz


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    Get me a mobile solution damnit!


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    Wondering if we have to buy a new programming cable....
    Retarded Mongoloid on PCP...

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    Quote Originally Posted by zap View Post
    Get me a mobile solution damnit!


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    I have wondered about gutting a 15 or 35W 900 Mhz Spectra except for the power amp and stuffing a DTR into it. Separating the T R lines and finding the signal to switch the antenna line would be the challenge.


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    Quote Originally Posted by zap View Post
    Get me a mobile solution damnit!


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    Leave it to the Chinese... they made TDMA switchable amplifiers for DMR - something tells me they could make a TDMA style amplifier for 900MHz as well.

    I like RFI's idea though - I wonder if gutting a 900MHz Spectra could ever work - and then find a way to smash the display into a new "head"...

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    Quote Originally Posted by Navy_BOFH View Post
    Leave it to the Chinese... they made TDMA switchable amplifiers for DMR - something tells me they could make a TDMA style amplifier for 900MHz as well.

    I like RFI's idea though - I wonder if gutting a 900MHz Spectra could ever work - and then find a way to smash the display into a new "head"...
    There are folks smarter than me who will figure out how to get the display to mash up.

    I think getting the PA working would be easy. It will require replicating the power control pass regulators onto some perf board . At same time as driver for the PIN switch could be cobbled up.

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    Default The Motorola DTR Is Dead... Long Live The DTR...

    No built in Bluetooth?

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    Quote Originally Posted by Navy_BOFH View Post
    Leave it to the Chinese... they made TDMA switchable amplifiers for DMR - something tells me they could make a TDMA style amplifier for 900MHz as well.

    I like RFI's idea though - I wonder if gutting a 900MHz Spectra could ever work - and then find a way to smash the display into a new "head"...
    I don't think the DTR's are TDMA. AFAIK they are hoppers, they use many channels and hop in pseudorandom sequences based on the talkgroups. Not sure if they are using discrete hops or some kind of CDMA "oozing" around the band. I have looked at them on a service monitor, and they have a very wide profile, so the spread-spectrum effect is very evident when they transmit.

    I am pretty sure they aren't TDMA or full-duplex, so you might be able to use some kind of fast switching normal RF PA, or a bi-directional amp that can handle the fast back-and-forth the radios use when initiating calls, etc.

    Either that or you would have to tap into the circuit to isolate the TX and RX RF lines. Might be a fun project! I have 4 or 5 of them, a mix of 450, 550 and 650 DTR's, I even found a Nextel keyboard for text messaging!

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    I know they use FHSS and VSELP but I assumed TDMA due to them essentially being iDEN technology packaged in a small radio. But youre right - no need for TDMA when youd rely on the radios to self-time which cant reliably happen.

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    Here's the cancellation notice and a presentation about the replacement.
    DTR Radio Cancellation Notice NA (1) (1).pdf
    DTR700 Presentation.pdf

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    And here's the FCC certification: https://fccid.io/AZ489FT5874