New Non-scannable Radios

[RayAir]

Motorola has come out with some new onsite walkie-talkies. They are the Motorola DTR 550 and DTR 650. They put out 1 watt of power and they use 900Mhz Digital FHSS (frequency hopping spread spectrum). They are just like Nextel's walkie-talkie phones, but they don't use cell towers. They come programmed with 5 public talkgroup channels, but with an optional keypad you can change the 11 digit radio I.D to create private channels. Each "channel" is 50 non-overlapping frequencies.

 

[Voyager]

They put out 1 watt of power and they use 900Mhz Digital FHSS (frequency hopping spread spectrum). They are just like Nextel's walkie-talkie phones, but they don't use cell towers.

NexTel units don't use cell towers, either.

Nor are they Spread Spectrum.

I guess they both DO use RF, and are manufactured by Motorola, but that's where the similarities end.

Joe M.

 

[kg4icg]

Nextels do use towers unless your unit does direct talk. How do you connect with some cross country without a tower for a 800 milliwatt unit.


R Collins

 

[Randall]

i think nextel is cdma, i could be wrong

 

[kg4icg]

Nextel is on the IDEN system which no one can hear.

 

[cg]

I am fairly certain that the Nextels that have Direct Talk (off network unit to unit comms) do use 900mhz FHSS.

chris

 

[RayAir]

I am fairly certain that the Nextels that have Direct Talk (off network unit to unit comms) do use 900mhz FHSS.

chris

Then how can I talk to my friend 15 miles away on Direct Connect without a tower? Nextel uses towers.

 

[DPD1]

Motorola has come out with some new onsite walkie-talkies. They are the Motorola DTR 550 and DTR 650. They put out 1 watt of power and they use 900Mhz Digital FHSS (frequency hopping spread spectrum). They are just like Nextel's walkie-talkie phones, but they don't use cell towers. They come programmed with 5 public talkgroup channels, but with an optional keypad you can change the 11 digit radio I.D to create private channels. Each "channel" is 50 non-overlapping frequencies.

Sounds like I have a new radio to get for airsoft games.

Dave
http://www.DPDProductions.com
- Custom Scanner, MURS, GMRS, & Ham Antennas -

 

[cg]

DirectTalk is different from DirectConnect. Phone service, DirectConnect, GroupConnect use the IDEN backbone. DirectTalk is an OFF NETWORK set up. No towers.


chris

 

[kg4uad]

At Almost 400.00 per unit and the fact that the radios are on site only, i bet they dont take off. Id bet theyll be just expensive toys for hospital and mall security guards. Ive seen another similar radio (not sure if it was motorola) that at least gave you cordless phone cabability, since its in the same band and for the price i think motorola could have given that option.

 

[RayAir]

Sounds like I have a new radio to get for airsoft games.

Dave
http://www.DPDProductions.com
- Custom Scanner, MURS, GMRS, & Ham Antennas -

Thats right! This is the perfect way to keep comms secure at an unbeatable price! If you change the radios 11 digit I.D with an optional keypad, you can create private talkgroups where each radios 11 digit I.D must match to hear each other. 11 digits, that's over one quadrillion possibilities, not bad for a cost of $270 apprx. per/radio. I bought 2 myself from Maryland Radio.

 

[RayAir]

http://www.motorola.com/dtr/
New Motorola On-Site Digital 2-way radios

 

[RayAir]

At Almost 400.00 per unit and the fact that the radios are on site only, i bet they dont take off. Id bet theyll be just expensive toys for hospital and mall security guards. Ive seen another similar radio (not sure if it was motorola) that at least gave you cordless phone cabability, since its in the same band and for the price i think motorola could have given that option.

I paid $270 ea. for them. Don't know where you looked?

 

[JohnnyGalaga]

How many times per second does the frequency change on those Motorola radios?

 

[kg4icg]

There is direct connect and then there's direct talk. 2 different features on some of the newer nextel phones like the one i have which is the i355.
R Collins

 

[DaveH]

Nextel does use towers but I think it was just a technicality that iDEN is not
on "cell" towers per se, it's generaically called ESMR and uses its own network
which integrates two-way, phone and other features. iDEN is TDMA (time slotted),
not CDMA.

Dave

 

[RayAir]

There is direct connect and then there's direct talk. 2 different features on some of the newer nextel phones like the one i have which is the i355.
R Collins

I just bought an i836 last May. I think I only have the regional walkie talkie for 2-way. I didn't know there was a local, non-tower feature for short range calling. I guess the i836 don't have that.

 

[N_Jay]

. . . but that's where the similarities end.

Joe M.

Except for the fact that the new Motorola DTR radios and the "Direct Talk" iDEN feature you the EXACT same technology. But use different code space so they are not compatible (by design)

http://www.nextel.com/en/support/faq/direct_talk.shtml

 

[mikewazowski]

Nextel is on the IDEN system which no one can hear.

Not true.

Scanners might not be able to listen in but there are other means available for someone with enough money.

Durham Regional PS in Ontario, Canada are on the Telus MIKE system which is the Canadian equivalent of Nextel. During a raid on a biker hangout, a very expensive IDEN service monitor was found.

Generally nothing is unmonitorable. All it takes is money, incredible processing horsepower, intelligence and time.

 

[N_Jay]

Generally nothing is unmonitorable. All it takes is money, incredible processing horsepower, intelligence and time.

All it takes is MONEY, (anyone can buy a service monitor);
except for encryption, that also takes TIME (generally more time than the information remains valuable).