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FRS/MURS Question (Digital)

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SCPD

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I know that in Europe the 446 band is allowed to use dPMR now... is there any frequencies in the US that are allowed to have digital TX on them? Such as MURS or FRS, be it the power output doesn't exceed the legal limit.

Thanks.
 

KC8ESL

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If I may ask a constructive question...

Why would you choose to (if legal) use digital voice modes on MURS or FRS? Where does analog fail that digital would be superior?
 

SCPD

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If I may ask a constructive question...

Why would you choose to (if legal) use digital voice modes on MURS or FRS? Where does analog fail that digital would be superior?
I'm not here to argue digital vs. analog. Just asking a simple question.
 

SCPD

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My apologies. There obviously must be a draw to it for you or you wouldn't have asked the question.
No apology needed; you did nothing wrong. I don't even own radios capable of TX, why I ask is recently there has been a digital transmission on 151.82 in a mall that is near me. I know of a store that is using those dPMR radios from China... and they antenna looks VHF. Not sure if it's them or not. I suppose since they're txing at 1 watt it's not really that big of a deal anyhow... just wasnt sure if it was TECHNICALLY LEGAL.
 

RayAir

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You would have to buy a digital capable radio and software. Then program in FRS frequencies. I take it you're looking for privacy? You could try some of the Kirisun s760/80 uhf radios. Buy the software and program them to FRS. They use FDMA digital, not sure on the vocoder, and they come with software programmable digital enc. It sounds to me like its pretty basic though, with about 10 million different keys. Compared to yesterdays DES with 72 quadrillion keys and modern AES with unspeakable long keys.

I don't think its legal though. I once ran dynamic band splitter scrambling on FRS back around 2005.

We since moved on to proprietary digital radios with more advanced digital encryption. And that is DES encrypted AEGIS and Harris OpenSky. OpenSky sounds better but it is not encrypted on our system.
 
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KF5YDR

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Digital is legal on MURS, as one of its explicitly mentioned uses in Part 95 is telemetry and remote control.
 

SCPD

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i run P25 DES-OFB on MURS i love in Norther Nevada and there no one around me to mess up there Comm's
 
D

DaveNF2G

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Telemetry and remote control are not the same as digital voice.
 

ScanWI

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If I may ask a constructive question...

Why would you choose to (if legal) use digital voice modes on MURS or FRS? Where does analog fail that digital would be superior?
Here is the answer from the Rule Book

MURS is the only un-licensed service other then 900 MHz ISM that allows for Digital Modes, but not Digital Voice.

95.631
(e) No GMRS or CB transmitter shall employ a digital modulation or emission.

(j) A MURS transmitter must transmit only emission types A1D, A2B, A2D, A3E, F2B, F1D, F2D, F3E, G3E. Emission types A3E, F3E and G3E include selective calling or tone-operated squelch tones to establish or continue voice communications. MURS transmitters are prohibited from transmitting in the continuous carrier mode.

This would include
8K10F1D - P25 Phase I C4FM data
8K30F1D - NXDN 12.5 Data
4k00F1D - NXDN 6.25 Data


Technically DMR would not be allowed on MURS since it's emission code doe not fall under those listed in part 95.631.
7K60FXD - 2-slot DMR (Motorola MOTOTRBO) TDMA data
7K60FXE - 2-slot DMR (Motorola MOTOTRBO) TDMA voice

MURS Use Outlined
eCFR — Code of Federal Regulations


Emission Types
eCFR — Code of Federal Regulations

Quick Chart of Emission Codes
Emission Designator - The RadioReference Wiki __________________
 
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