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DTR radios?

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N

N_Jay

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kayn1n32008 said:
interesting, if it is sotware driven, do you suppose it would possible to add the DT feature to an iDEN radio that does not come from the factory with it? would be nice so i dont have to go and buy a i355 for my gf to be able to use the dt feature
Click to expand...

I doubt it.

You would have to have the EXACT same hardware base, and get the correct load of firmware, or you woudl have to be good enough to hack the firmware to work on the hardware you have and hope it is close enough to support all the functions.
 
KE4ZNR

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N_Jay said:
I doubt it.

You would have to have the EXACT same hardware base, and get the correct load of firmware, or you woudl have to be good enough to hack the firmware to work on the hardware you have and hope it is close enough to support all the functions.
Click to expand...

You would have to hack both the firmware and the codeplug plus the hardware has to support it. People (like myself) have decrypted the firmware (berbug anyone?) and the codeplugs but getting direct talk to happen in a non direct talk capable iden phone ain't gonna happen. You can enable/modify some cool stuff in iden firmware/codeplugs but direct talk ain't one of them.
I do think N_Jay will back me up on my iden knowledge.
Marshall KE4ZNR
 
RayAir

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The Motorola DTR radios use FHSS and the digital voice is VSELP. DTR's are better quality than the TriSquare. You can only TX if another unit is within range. The voice is fairly good with noticeable vocoder latency. You can use the 5 public groups that come pre-programmed (you can change the public groups into sub groups through the options menu) or you can buy a little programmer for alpha tagging talk groups or create your own private channels by entering your private 11 digit I.D

The TriSquare eXRS radios use FHSS and TDMA technology. They can TX like any FRS radio (another unit does not have to be within range as with the DTR) 100 series radio offers 1,000 channels, 300 offers more options and 2,000,000,000 channels. As far as hop rates the TriSquare is 400Ms, unknown exactly what the DTR hops at.


Both are great options for license free short distance use. They beat FRS/MURS/CB/GMRS hands down for being private and interference free.

DTR's operate pretty much like Nextel's Direct Connect, but they are not compatible.

I believe the 2.4GHz DTR's are sold in Europe and have 100mW TX power.
 
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Hornhonker

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Ray_Air said:
As far as hop rates the TriSquare is 400Ms, unknown exactly what the DTR hops at.

I believe the 2.4GHz DTR's are sold in Europe and have 100mW TX power.
Click to expand...

The European DTR2450 hops at 90ms. I would guess our DTR650 would hop at the same rate ?
 
Hornhonker

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Info on the DTR2450 and hop rate:

http://www.motorola.com/emea/dtr/en...&WT.mc_n=dtr_emea_en&WT.mc_t=Home&WT.mc_r=120



FHSS means that the (digitized) voice/text message is broken down into small packets that are transmitted on different frequencies, to minimize the chance of either interference from, or eavesdropping by, other 2.4GHz users. The radios "hop" from one frequency to another following a "pseudo-random hopping sequence." The DTR Series radios "hop" between 50 frequencies, staying on each frequency for 90msecs to transmit/receive voice/text message data packets.
Each packet is sent multiple times, to further minimize the chance of not receiving packets due to interference from another 2.4GHz product, and to improve the receiver sensitivity. For voice transmissions, the received packets are re-assembled on a "rolling basis" to form the total "message," converted back to analogue signals, and sent to the loudspeaker.

Unlike analogue radios, multiple group or private communications can occur simultaneously on the same channel, because each Public/Private/Individual call uses a different pseudo-random hopping sequence to "hop" around the 50 frequencies.
 
RayAir

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Astro25 said:
Well, they sure hop fast enough to where my Optoelectronics Scout doesn't even flicker the display...
Click to expand...

I tried my Optoelectronics gear also, it will flicker around the 900MHz range, but it is not accurate.My old RS freq. counter in fast gate speed mode will also bounce around the ISM band also. The signal shows pretty good on my spectrum analyzer.

Popular Communications did a few articles on these radios. They actually went into the security from eavesdropping issue and said hobbyist gear could not track the hop rate. Even if it could you wouldn't be able to readily demodulate it. They did say a WJ Microceptor surveillance receiver would be needed to track the signal and demodulate it. I know WJ gear is big $$$. There's another surveillance receiver out there for tracking frequency hopping radios called a FH-1 receiver. I don't know if it will go up that high (900MHz+). I think the FH-1 is or was primarily used to track frequency hopping HF radios.

The FH-1 would track radios like this:
http://hf-ssb-transceiver.at-communication.com/en/qmac/frequency_hopping.html

The military would add encryption to the freq. hopping to guard against receivers such as the FH-1.

I just mention this because freq. hopping/spread spectrum was originally developed for the military. It's kind of cool that the technology has filtered down to the general populace.
 
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