System for Secutiry Guards?

[n1das]

The Motorola DTR radios are encrypted frequency hopping 900 MHz licence free radios. Not sure if they can interface for data, but they are good for voice. What environment is the data being used in anyways? If it is a building, just use WiFi.

The DTRs have very limited data capabilities. They can send and receive preprogrammed text messages. They are intended for local on-site small business type use. I have found them to be popular with hotel security and housekeeping staff.

The Motorola DTRs are NOT encrypted. The payload data is not encrypted but they can be made very secure with how they operate due to the FHSS. The vocoder used is VSELP. They use an ID-based system and each radio has its own 11 digit electronic serial number (ESN) that's not changeable by the end user or by programming through the CPS. Public and private groups can be set up for a given frequency hopset. Public groups are monitorable by other DTR radios set to the same public group and frequency hopset. In a public group, a DTR radio will respond to IDs from any radio heard on the public group. With a private group, a DTR radio must be a member of the private group and only responds to radio IDs that are members of the private group. All DTRs in a private group must be members of the private group since each radio maintains a list of IDs of members of the group. The list of radio IDs is set up in the programming for each radio using the Customer Programming Software (CPS). DTRs will not respond to any private groups which they are not a member of. So while the DTRs are not encrypted, they can be made very secure given how they operate by setting up a private talkgroup.

I own a small fleet of DTR radios and they work EXCELLENT for local on-site type simplex use. My wife loves using them too as part of our activities when we are out doing stuff. We actually prefer to use the DTRs instead of analog simplex on GMRS/FRS using good Part 90/95 commercial gear.

DTRs might work for what the OP is looking for. Also check out the DLR series.
DTR series: https://www.motorolasolutions.com/e...adios/on-site-business-radios/dtr-series.html
DLR series: https://www.motorolasolutions.com/e...business-radios/dlr-series-digital-radio.html

The DTRs and DLRs are only legal in the USA and Canada. IIRC, 2.4GHz versions of the DTRs also exist for use in European countries.
https://www.motorolasolutions.com/e...erday's-products/dtr-2450.html#tabproductinfo

Have fun!

 

[Your_account]

What your really asking for is a military type radio. You can look at some of the Harris radios and see if they are what your looking for. But many of them are not for export outside the U. S.

Tomorrow I fly to Portugal and searched for a Radio and found this:
R&S®MR3000P VHF tactical handheld radio
Google Know why the show me that *gg*.

goTenna Mesh with smartphone or tablet bluetooth and APP's for data communications

With the legal output power the range is to low.

IIRC, 2.4GHz versions of the DTRs also exist for use in European countries.
https://www.motorolasolutions.com/en...tabproductinfo

Cant find any Datasheet.
Voice Communication is not the problem.

 

[com501]

I am sure by now DHS has contacted Interpol and inquired with the website operator. You DO KNOW that you can buy fully encrypted complaint cell phones that will operate on GSM networks? Right? And no, the gubmint can decode it, for a very long time.

 

[RFI-EMI-GUY]

I am sure by now DHS has contacted Interpol and inquired with the website operator. You DO KNOW that you can buy fully encrypted complaint cell phones that will operate on GSM networks? Right? And no, the gubmint can decode it, for a very long time.

Can or cannot decode it?

I wonder about the OP, what kind of "security" he is offering.

Everything can be decoded, eventually.

AES256 I would suspect has a backdoor or flaws thanks to NSA "help".

The old Securenet CVSD 56 kb stuff probably has no backdoor , but DES can be cracked in 3 days, maybe less considering the CVSD has strings of 1010101010 in the plaintext during silent passages and also inserted for preamble synch.

Then you have all the open-source encryption. How does one know that friendly Bob the "hacker/coder" who offers to beta test the code and fix the bugs, isn't actually on the NSA payroll? Or the KGB, or,,,,,,,

Sent from my SM-T350 using Tapatalk

 

[com501]

Secure is when you don't communicate with anyone. Every thing is listening now, and yes, I meant 'cannot'. I will never completely recover from my stroke, it pops up in odd ways all the time.

 

[Your_account]

You DO KNOW that you can buy fully encrypted complaint cell phones that will operate on GSM networks?

Do you know how much power the Simcard have on the Phone? Its easy to install a Software who Stream the Audio Data before it get encrypt.

Everything can be decoded, eventually.

sure but its hard when a non centralised System is use.
When you use 3 Radios and transmit Data between them (with a low power) someone have to receive there Signal and send it to an Server system to decode.
Data who are lets say 10Min, 30Min or a Year old are useless. For example when you know where a Plane was 1 Year ago you could not do anything with the Data.
Even when I use my Sound Modem on CB and Transmitt a PSK31 Signal with the following Number: 91841913151 good look to find any pattern or what it actually mean.
The could be Random Number or the good old Number Station.

A Voice Communication even work with the cheap TYT Radios. The Main problem is a Data communication between 2 Radios. I could not find any Information if or how it work.

 

[RFI-EMI-GUY]

Program a dozen or so simplex frequencies in the radios. Change channels pseudo randomly every 30 minutes per a prearranged schedule. Run as low power as possible. Overlay with CVSD 56 kb encryption or better. Never reveal anything of lasting importance on the channel such as names or other identification. If you also use a clear channel, do not duplicate ID's or brevity codes between clear and secure channels.

Sent from my SM-T350 using Tapatalk

 

[Your_account]

The Audio stuff isnt any problem I can use the TYT Radios for.
The think who make me a lot of headache is how to transfer Data from Radio A to Radio B wihtout any infrastructure.
The Company even dont replay to my E-Mails.

 

[RFI-EMI-GUY]

The Audio stuff isnt any problem I can use the TYT Radios for.
The think who make me a lot of headache is how to transfer Data from Radio A to Radio B wihtout any infrastructure.
The Company even dont replay to my E-Mails.

There are AX-25 packet modems that work just fine from 1200 up to 9600 baud (radio dependent). You can also store and forward between nodes. You won't be sending video or sound files but you can send text messages just fine.

 

[Your_account]

What I need is a Handhelt Radio there is no space or room for a additional Modem.

 

[paulears]

This is a bit silly. Simplex radios are available that will do all these things, and can have data port fitted to connect to whatever you have, but cannot tell us about, but they cost real money. Plenty of encryption possibilities if you want them. You just have to buy the clever radios, programme them and then decide to be legal and licence them or not. That's a moral decision.

The trouble here is that your posts really didn't explain things very well at all and your choice of words puts concern in people's minds - some is just hard to read, other bits make no sense or confuse. No need to get cross, but people couldn't really answer with only half the deck of cards.