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Posted

The low power and fixed antenna I would think limit these radios in comparison to our GMRS. Still I found it interesting to see how radio services are handled differently in other places. 

Posted

From one of the AI bots:

Based on the web search results, it seems that the dPMR modulation mask is accepted by the FCC for operation in the US. According to one source1, “dPMR equipment complies with the relevant European standard ETSI EN 301 166 as well as the FCC emission mask applicable for operation in the US.” Another source2 states that “dPMR uses 4FSK at 2400 Bd. The dibits are mapped to +/-1050 Hz and +/-350 Hz from the center frequency. Because the emission mask is so tight, two 6.25 kHz dPMR signals can be used next to each other within a 12.5 kHz channel without causing interference to each other or adjacent channels.” A third source3 confirms that the dPMR modulation scheme would comply with the FCC emission mask mandated for LMRs to have a 6.25-kilohertz capability.

Posted
8 hours ago, BoxCar said:

From one of the AI bots:

Based on the web search results, it seems that the dPMR modulation mask is accepted by the FCC for operation in the US. According to one source1, “dPMR equipment complies with the relevant European standard ETSI EN 301 166 as well as the FCC emission mask applicable for operation in the US.” Another source2 states that “dPMR uses 4FSK at 2400 Bd. The dibits are mapped to +/-1050 Hz and +/-350 Hz from the center frequency. Because the emission mask is so tight, two 6.25 kHz dPMR signals can be used next to each other within a 12.5 kHz channel without causing interference to each other or adjacent channels.” A third source3 confirms that the dPMR modulation scheme would comply with the FCC emission mask mandated for LMRs to have a 6.25-kilohertz capability.

dPMR and the ultra narrow version of NXDN are similar except they use a different CAI, common air interface, protocol. In fact there was a European version of a Kenwood NXDN radio that could be converted to dPMR per the brochure.

 

NX-220E-320E.pdf

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