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Lscott

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Everything posted by Lscott

  1. Lscott
    There is nothing in the rules that requires this, but it's the general practice. https://www.customsmobile.com/regulations/title47_chapterI-i4_part95_subpartE_section95.1763 A few repeater owners have selected a frequency pair from the 462 and 467 groups that are NOT an exact 5MHz offset. That was done to discourage some users, with fixed programed frequencies in their radios, from accessing the repeater. While that will "tie-up" what amounts to 2 "repeater channels" and may not be well received by other repeater owners it's not illegal under the current GMRS rules. https://wiki.radioreference.com/index.php/Offset Same with tones. A few owners have required the use of MDC to access the repeater in an attempt to limit unauthorized access. Most of the common Chinese radios can do CTCSS or DCS but not MDC, thus cutting them off from the use of the repeater. The are a number of the more expensive new/used commercial grade radios do include MDC functionality other than Motorola. See attached example brochures. https://en.wikipedia.org/wiki/MDC-1200 TK-2360-3360 Brochure.pdf TK-5220_5320 Brochure - 1.pdf NX-1200_1300 Num 1.pdf NX-220_320.pdf
  2. Lscott
    Or GMRS users simply don't need the feature enough to bother commenting to the FCC about it.
  3. Lscott
    It's bad enough people are trying to poke at their vehicle's touch screens, or playing with their smartphones, while driving. Do we really need another distraction for the driver?
  4. Lscott
    You very likely can get a purpose built repeater controller for a lot less money unless you "happen" to have a PLC laying around someplace. Otherwise the cheapest thing you likely can use is like the example linked to below. https://www.robotshop.com/products/ardbox-plc-20-analog-modbus-industrial-arduino-module
  5. Lscott
    I think if one wanted to know your location in an urban area using an app on the smart phone seems like a better idea. At least the location data can be overlaid directly on a map using a device most people already own. Using an HT or mobile radio alone one would still require some method to plot the GPS location so more hardware would be required anyway. The above point also applies while out "in the woods" too. I guess one would have to store the maps on an external device first then interface the radio to it to plot the GPS location being sent it it. Apparently there are some devices that can do both in one box but they likely aren't cheap. https://g.factoryoutletstore.com/cat/31220/rino-.html
  6. Lscott
    The FCC screwed up when they allowed the sale of combination FRS/GMRS radios before the rule changes in 2017. The idea was if one wanted to use the GMRS specific, at the time, channels one would have to get a GMRS license. Well, almost nobody bothered. So, when the rules were changed in 2017 the FCC had to do something about all the existing radios out there. They simply changed the rules to make those combination FRS/GMRS radios FRS only and legal to use as is. However the channels you pointed out sit between the main GMRS repeater input channels, which use a 25KHz channel. The FRS channels, 8-14, where kept at very low power and narrow band since they partially overlap the main GMRS repeater channels. The idea was to minimize the interference they cause. At the time FRS was limited to 0.5 watts and narrow band, 12.5KHz channel, so keeping the restrictions didn't require any changes to existing radios. As you pointed out for FM use they are basically useless. Many GMRS specific radios don't even include them, noticeably on mobile radios. So practically speaking GMRS really has useful access to only 15 channels. You might ask is there something that those channels could be used for? Maybe, but that's a topic for another thread, which if you look you'll find on the forum discussing adding channels to GMRS. FRS-GMRS Channels Layout.pdf
  7. Lscott
    Have you considered using any of the license free MURS radios? While limited to 2 watts max at VHF they do a bit better in terrain that's a bit hilly and tree covered. https://en.wikipedia.org/wiki/Multi-Use_Radio_Service Some examples of MURS radios. https://www.retevis.com/murs-radios https://www.buytwowayradios.com/business/murs-radios.html There is also a mobile magnet mount antenna that is usable for both GMRS and MURS in case you decide to carry both types. https://dpdproductions.com/products/dual-band-gmrs-murs-mobile-antenna
  8. Lscott

    Lscott commented on TheNevilleKid's gallery image in Members Albums Category

    You'll end up like me with a bunch more radios in your collection. It's addictive.
  9. Lscott
    I checked mine, V4, and the attached photo are they only frequency options shown for the TK-880 mobile radio.
  10. Lscott
    I never claimed it was. The dPMR service in the EU seems to be working out OK so apparently it's very possible to do, share the spectrum. In fact they have TWO digital voice modes, dPMR and DMR. Further on 11M people have used AM and SSB for years and now FM is added to the mix. I don't see any huge crying over that either. I have to agree with those with how annoying a mode like TDMA, which is how DMR operates, with the machine gun like pulsing. I do know that the TDMA nature of the signal is known to cause false opening of the squelch, when using CTSS, on analog radios. It happens on the CCR tri-bander I have in the office I use as a cheap scanner from time to time. The two modes I mentioned in the paper are FDMA, no pulsing noise. I also am NOT advocating using digital voice on repeaters. I would keep those analog only. Analogue and Digital PMR446 Information Sheet.pdf The-effect-on-dPMR-446-of-the-new-digital-license-v3-2019.pdf
  11. Lscott
    Looks like that's were we should start, get the FCC to enforce the rules. The whole point with enabling digital voice, in some limited manner, on GMRS has nothing to do with experimentation or making it a "Ham Lite" type service. It's more about improving the quality of service. As it exists now the general GMRS user really only "practically" use channels 1-7 and 15-22 due to the above restrictions on channels 8-14. The proposal I made in that paper would take the nearly useless narrow band low power interstitial channels and put them to better use. The topic of this thread was more "repeater" channels. While not exactly adding more channels by allowing using digital voice on 8-14 and at a reasonable power, 5 watts in simplex mode, we effectively gain 5 more channels without asking the FCC for more spectrum, which likely won't ever happen. Better than nothing and a kick in the butt from the FCC.
  12. Lscott
    Sounds like to me the battle is already lost. What your complaint is really all about is no FCC enforcement. Not really about digital voice, although you pick on it as an example. We also have reports by others of illegal use of GMRS by businesses with no licenses etc. This topic deserves a whole thread on its own. But that’s not what this one is about.
  13. Lscott
    Two decent strength analog FM signals do a really good job of wiping each other out too. Did you bother to read the file I posted the other day on this thread?
  14. Lscott
    I wouldn’t make a blanket statement like that. This is why the topic doesn’t get a serious discussion. There is a way to partially accommodate a digital voice mode if one is willing to consider reasonable options. Read the attached document, particularly the last few paragraphs. GMRS Digital Voice - 20231127.pdf
  15. Lscott
    Could be true. But I swear some of the operators might be brain dead.
  16. Lscott
    The problem with people asking for opinions is where they get good advise then go out and buy the cheapest P.O.S. on the market. Makes one wonder why they bothered to ask.
  17. Lscott
    That's cool! I could use a new calendar for my office. One like the above would be nice.
  18. Lscott
    Might be true of new models. However I own a bunch of older Kenwood radios the have Part 95 certification, and some of those are digital voice capable. My carry radio for GMRS and Ham UHF is the Kenwood TK-3170. A few others here use it as well. https://forums.mygmrs.com/gallery/image/263-tk-3170jpg/ TK-3170 Grant.pdf
  19. Lscott
    Good old phone spoofing memories.
  20. Lscott
    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
  21. Lscott
    They don't use GMRS in Germany. If anything its PMR446. https://en.wikipedia.org/wiki/PMR446
  22. Lscott
    Slide Rule.jpg

    From the album: Misc. Radio Gear

    I purchased this from a slide rule museum on line. It was surplus to their collection and in very good condition. Not very many young people have seen one or even know what it does. You do see them from time to time in old sci-fi movies. In a SHTF or EMP situation I'll never have to worry about this failing. Also doesn't need batteries either. https://simple.wikipedia.org/wiki/Slide_rule A training manual from Picket. https://sliderulemuseum.com/Manuals/M175_Pickett_TeachingGuide_601.pdf Little known facts that the Apollo moon missions carried slide rules on board as a backup in case of complete failure of the on-board computer system. https://followingtherules.info/rules-to-the-moon.html
  23. Lscott
    A while ago. You can still smell it. A few will still try to kick the bones around for a bit
  24. Lscott
    It's going to take some careful thought to figure out how to do it. IMHO for the moment we should just forget running digital voice on repeaters. I think the major gain is digital voice on simplex. The logic there if you need a repeater the analog FM types seem to do a very good job of providing good coverage. The digital voice modes would primarily benefit HT to HT, or HT to mobile/base communications. Also remember UHF spectrum is limited. The FCC mandated most services move to narrow band in an attempt to free up more spectrum. Asking the FCC to allocate more spectrum to GMRS is very likely dead on arrival. We would be lucky to keep what we have now. https://forums.mygmrs.com/topic/6478-digital-direct-mode-simplex-on-462-mhz-gmrs-channels/?do=findComment&comment=66329&_rid=1908
  25. Lscott
    That's one of the key areas that has to be examined and the potential interference issues resolved. I covered that in the attached opinion paper in my prior post in this tread.
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