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axorlov

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axorlov last won the day on July 22

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    Livermore, CA

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  1. Tradition. Before 2017 rule change 50W GMRS frequencies were not legally available for FRS users. Of course, everybody on FRS still used them, thus a rule change in 2017. It's actually easier to remember frequencies. Block of hi-power channels starts with 462.550 MHz, ends with 462.725 MHz, step is 25 KHz. 5W interstitial are in between, and I don't care about 0.5W channels. Easy. And not all radios have channel numbers. Many Part 95 and Part 90 radios only display channels if you program to display them. I can't be bothered to remember all these silly channel numbers. They are also different between Uniden and the rest of manufacturers.
  2. You may also search this forum for Ed Fong antenna. Some people like them, some do not. I do not.
  3. I totally agree on the point that location info is almost useless without the map, however this problem is solved already. Garmin watches render quite workable maps on a watch-sized screen, radios certainly could do so too. And for the battery, Kenwood D72 was the same, 4 hours max on fresh battery with APRS. But Yaesu FT-1XR will happily do APRS all day. Battery life is what killed D72 for me. I now regret selling it, because of it's awesome packet capabilities, but 90% of what I do is covered by FT-1XD. The remaining 10% is covered by laptop+FT817.
  4. I'm not Motorola expert, but after quick search it appears to be digital only. 4FSK modulation, 7K60F1D, 7K60FXD, 7K60F1E, 7K60FXE. Specs here: https://cdn.shopify.com/s/files/1/0069/8495/8052/files/SL7000e_DataSheet.pdf?v=1588697493
  5. I bumped kb2ztx back. This reordering based on the score makes my head spin. Crazy stuff...
  6. I, myself, just slipped freshly minted $70 bill to the examiner. But don't tell anyone. 8 wide-band frequencies + 8 wide-band repeater inputs + 8 wide-band low power freqs + 7 narrow-band low power freqs + CTCSS + DTS = over 9000 channels! Chinese math, yo! Could be tedious to add manually.
  7. axorlov

    AT-778

    Part 90 went narrow band several years ago. It may be that there is no wide band certifications anymore. I do not know for sure, just a guessing.
  8. Yes, I said it before and will repeat again: testing SWR of HT antenna by simply plugging in SWR meter is meaningless.
  9. axorlov

    AT-778

    I'm looking for something like MTX 275 or this one for the installation in a small car. FCC ID?
  10. Looks nice. Why not to use one antenna and a switch for Ham and GMRS? Do you need both radios on at the same time, or you're trying to avoid complexity with family users?
  11. I'll continue. Split tones are for everyone! As long as your equipment allows to use them. Benefits are abundant! Well, for the repeater owners. They can keep people with wrong equipment, or without the right knowledge, off the repeater. Low plank to pass, but nevertheless, filters problematic audience. It also challenges a _very_ problematic audience, they take it as a personal affront and make themselves a bigger problem.
  12. I'll elaborate. As WRNA236 pointed out, the HT-HT distance is not limited by curvature of earth in residential areas. It is limited by the fact that they are HTs with all the drawbacks. Removing these limitations on one side, quadruples the distance, easily. From 1/2 mile (reliable range in residential area HT<->HT) to 2 miles at very least (reliable range residential area Mobile<->HT). And don't knock down bicycle courier. 1 mile in residential is a roughly 10 minute round trip, with all the obstacles and curb-jumping. What would you rather take at 1 mile radius: non-working radio comms or reliable comms with 10 minute delay?
  13. Allright, let's set aside the Baofeng hate, although they are not as good as other brands. It's a topic for another thread. My point was that much more efficient antenna + much better receiver of mobile radio (that is not BTech) + 6' elevation will hear your 4W HT at 4x times the distance that your normal HT hears your 4W HT. Actually further. And 40W from your mobile through much more efficient antenna will allow your HT to hear at 4x times the distance, comparing to HT to HT range. This effect is repeatable and reliable. I performed this experiment several times, in residential area, in the Sierra foothills, in the dense forest. I never performed it in a clear flat field. In residential area my range is 5x.
  14. I'm going to state it again: HT to Mobile with 1/4-wave at 6 ft on a flat roof has 4 times the range (I'm being conservative) of HT to HT. In some cases significantly more, like in rocky canyons. Witnessed, tested, proven. Besides the wave absorption (line of sight, obstacles, yada yada), there are wave interference, diffraction, reflection and scattering are taking place. That is all true, of course, if you do not use Baofeng. With Baofengs on both ends courier on a bicycle provides much more reliable comms.
  15. In my personal experience, using mobile with 1/4-wave on a flat SUV roof at least quadruples the range of HT to HT. And regarding Baofeng (Btech, Pofung) - stay away from these. In a disaster situation you need your radio to actually work, with extended duty cycles, with interference from other radios nearby.
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