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Showing content with the highest reputation on 09/14/20 in Posts

  1. Looking through the FCC rules there doesn't seem to be any requirements that repeater offsets must be 5MHz. ----------------------------------------------------------------------------------------------------------------------------------------------------------------- §95.1763 GMRS channels. The GMRS is allotted 30 channels—16 main channels and 14 interstitial channels. GMRS stations may transmit on any of the channels as indicated below. (a) 462 MHz main channels. Only mobile, hand-held portable, repeater, base and fixed stations may transmit on these 8 channels. The channel center frequencies are: 462.5500, 462.5750, 462.6000, 462.6250, 462.6500, 462.6750, 462.7000, and 462.7250 MHz. ( 462 MHz interstitial channels. Only mobile, hand-held portable and base stations may transmit on these 7 channels. The channel center frequencies are: 462.5625, 462.5875, 462.6125, 462.6375, 462.6625, 462.6875, and 462.7125 MHz. © 467 MHz main channels. Only mobile, hand-held portable, control and fixed stations may transmit on these 8 channels. Mobile, hand-held portable and control stations may transmit on these channels only when communicating through a repeater station or making brief test transmissions in accordance with §95.319©. The channel center frequencies are: 467.5500, 467.5750, 467.6000, 467.6250, 467.6500, 467.6750, 467.7000, and 467.7250 MHz. (d) 467 MHz interstitial channels. Only hand-held portable units may transmit on these 7 channels. The channel center frequencies are: 467.5675, 467.5875, 467.6125, 467.6375, 467.6625, 467.6875, and 467.7125 MHz. --------------------------------------------------------------------------------------------------------------------------------------------------------------------- I see a lot of newbie questions about repeaters where the "typical" reply states the repeater input frequency is 5MHz higher than the output frequency. However the rules don't require that. Read sections §95.1763 A and C. No mention about a required offset when going through a repeater. It seems so long as the repeater output frequency is one of the 462MHz main channels and the input frequency is one of the 467MHz main channels the FCC is fine with that. Why does that matter? Many people are buying GMRS specific radios that have the repeater frequencies per-programmed into them, with the "common" 5MHz offset assumed by the manufacture and hard coded by the firmware. However if a repeater owner sets up his system to use an input frequency and output frequency that is NOT a 5MHz offset anyone unfortunate enough to own a radio with the repeater frequencies hard coded by the firmware is out of luck. There is noway to make it work short of changing the frequencies. For somebody who wants to keep his repeater "private" with reduced chances of being abused by non authorized users could employ a nonstandard frequency offset. Of course anyone who wishes to use the repeater must have a radio that allows the "non-standard" 5MHz offset to be programmed into it. That leaves for the most part old commercial radios. For a really flexible GMRS specific radio a manufacture should provide a repeater memory channel where the input and output frequencies are selected from a list along with the access tone(s) required. I see enough comments about the Midland radios concerning the tone and bandwidth issues, but nothing about the repeater offsets. If the radios are targeted to be "fully" GMRS rule compliant, sooner or later, the above issue should be addressed as well. This likely also applies to the other GMRS specific radios I see mentioned on the forum.
    2 points
  2. Well....GMRS isn't a hobby. GMRS is a utility service. Most users use it for functional communications with family or a small, exclusive group. It isn't amateur radio, which *IS* a hobby. Sent from my SM-A102U using Tapatalk
    1 point
  3. Perhaps. Given the recent rule changes GMRS repeaters have to tolerate possible interference on the adjacent interstitial frequencies between the main repeater input frequencies, if not on the frequencies used. There have been a few comments on the forum about this. If the offending person or business is not willing to change the repeater owner may have little choice. In my case a repeater, about the only one around in the area, has one or more local families sitting on the repeater output frequency. Fat chance getting them to move given the little kids are always screwing with the radios don't understand what is going on and the parents don't care. Several other channels are used by local businesses including, I suspect, by a nearby Chrysler assembly plant based on what I hear being discussed.
    1 point
  4. I guess i have been in the LMR world way too long but i dont think i have ever seen a UHF repeater that did not use 5mhz. That is the standard in LMR and most licenses will show that. I agree its not spelled out in GMRS rules but I can't imagine anyone who would use different output and input frequencies as you described. Even in the Ham world most all UHF repeaters are 5mhz apart. I dont see a need for commercial providers to make a radio to be able to use anything other than 5mhz. JMHO
    1 point
  5. I think it is different depending on who owns the repeater. I have alot of funds into my systems. I did it so myself and others could use the service. I don't want unlicensed CCR junk on my repeaters for multiple reasons that I wont discuss here. I specifically have my repeaters programmed to help eliminate that. It still happens from time to time. I have never not given permission to a licensed GMRS user to use my gear. Have a valid license don't be an idiot and use it.
    1 point
  6. Jones

    New guy question

    See page 18 of the owner's manual. Press the TS/DCS button on the front panel. It will toggle between CTCSS, DCS, and OFF modes.
    1 point
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