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I feel kind of stupid asking this question, but I'm genuinely not sure of the answer. I know MDC signalling is not legal on amateur radio, because it is a proprietary (Motorola) protocol (e.g. not an open 'standard'). However, I can't find anything in the rules that prohibits its use on GMRS. Legal or not legal? (cause I'd really like to use it). I'm leaning towards it being legal but I'd really like some feedback on the topic Thanks!
To all GMRS licensees: I have just spoken with the FCC regarding a Petition for Reconsideration filed by Motorola regarding automatic GPS and data transmissions on the GMRS band. Motorola would like to allow automatic transmissions on the 462 MHz frequencies which includes repeater outputs (Channel 15-22) and the interstitial 462 MHz channels (Channels 1-7). The repeater inputs are not presently mentioned, however we will articulate our position to the Commission that these input frequencies should be prohibited due to the potential of interference to repeaters. myGMRS.com (and it's parent company RepeaterFinder, LLC) will be filing an ex parte response in the docket with the following requests: A Busy Channel Lockout (BCL) feature be mandated for any radios which are to operate in an automatic fashion. The devices must inhibit transmission if there is co-channel activity to prevent interference to other users of the shared frequencies. Blind periodic transmissions are going to be very problematic and will almost certainly cause interference. Limit automatic transmission to the 462 MHz GMRS channels only. Repeater inputs must be excluded to mitigate potential interference. Duty cycle limits of the bursts must be set by the FCC. I believe Uniden America proposed no more than once every 2 minutes and no more than 5 seconds per transmission. This sounds reasonable to cover longer text messages and location updates without constantly trashing the band. The FCC plans to respond to Motorola and issue a decision in the next couple of weeks, so anyone who would like to submit comments to the record is encouraged to do so as soon as possible. No exact deadline was given, but they expressed a desire to have this hammered out within the next week or two. I will provide further details later today. Original Petition for Reconsideration from September 2017: https://ecfsapi.fcc.gov/file/10928247080350/Ready%20For%20Filing_Motorola%20Part%2095%20Petition%20for%20Recon.pdf Further Comments from Motorola from January 2018: https://ecfsapi.fcc.gov/file/101081822912433/Motorola_Part%2095%20Recon_Further%20Comments.pdf Letter from Motorola Detailing their Discussion with Members of the FCC from April 2018: https://ecfsapi.fcc.gov/file/10420845023222/April%202018_GMRS_FRS_ex%20parte%20notification.docx