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Everything posted by axorlov

  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


    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


    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.
  16. I'm in Livermore, there are some unlisted repeaters that I can here, and there are listed ones too. One is on top of Sunol ridge, convenient location since it can be reached from Silicon Valley and from Tri-Valley, but they did not let me in some years ago (https://mygmrs.com/view?id=2466). I don't really care, 99.99% of my GMRS use is simplex. Ask, maybe they will let you in. Although, you may be in the shadow in Danville.
  17. I'm sure 8180 owners and experts will chime in, but for now: The "H" means high power, 45W in case of 8180. From programming standpoint 8180H and 8180 should be identical. "K" - I have no clue, but with my Kenwood 3170 "K" is a regular one, and "K4" is with 12-key keypad. I would follow the advice and chose 8180H if your radio on hand is 8180H-K. Safe download - now this is a longshot these days! hamfiles.co.uk considered to be reliable. I just download from the radiosoftware.ru, I like to live dangerously. Kenwood software for Windows works in Win10. I personally have KPG-49D and KPG-101D working fine. Firmware update does not seem to be required (with my 880 and 3170).
  18. Yes, propagation in the mountains surprised me many times. I grew up and got my first Ham callsign in the rolling hills area, and was always skeptical of "wife's tales" about how far UHF can go in the mountain region. When me and family started to actively use GMRS in California, in Sierra Nevada with it's granite cliffs, sharp mountain ridges and not dense forestation, these wife's tales became a reality. Important is that knife-edge and other diffraction-reflection modes are a reliable modes, repeatable day after a day, unlike some other methods of propagation.
  19. axorlov


    Case and size are very different. Leixen is roughly 4 times smaller in volume than TK-880. Button layout may look alike, just like between Motorola and Kenwood mobiles. Kenwood and Leixen radios are generations, and worlds apart. They are as similar as elephant and elephant slug are similar. Just look at the service manual for 880 and pictures of inside of Leixen on the internet. As an owner of TK-880 you should have service manual, download it from here (for V2.0): http://www.repeater-builder.com/kenwood/pdfs/tk-880-svc-man-rev-e.pdf
  20. axorlov


    Leixen 898 is not a clone of TK-880, not even close. Radios are totally unrelated. Cable might work, though. The software is KPG-49d, as mentioned already in this thread, versions 4.x are for Windows, work just fine in Win10 X64 with USB-to-serial adapter. I have 4.02.
  21. Hey, go recalibrate your body! Health is first, family is second, and everything else (including posting on silly forums) is a distant 100th.
  22. 95:335(a): (a) Exceptions. Under certain exceptions, non-certified Personal Radio Service transmitters, or transmitters certified for use in the land mobile radio services may be operated. Any such exceptions applicable to stations in a Personal Radio Service are set forth in the subpart governing that specific service. See e.g., §§ 95.735 and 95.1735. "Under certain exceptions", and 95.735 is related to radio control, and 95.1735 does not exist. Ambiguous wording - is not even close. Thanks for the effort of contacting them and getting clarification. Often, the practice of the enforcement tramples the letter of the law.
  23. Insight into HT antennas is simple: - measuring length is meaningless; however, in general, the longer the better; - measuring SWR is meaningless; - to measure the efficiency of HT antenna you must use field strength meter and calibrated human body + calibrated human hand.
  24. Hey, MacJack Congrats to you and your granddaughter for your Ham tickets. It's a lot of fun! With APRS specifically, when I just started to dip into digital and APRS, years ago, messing around with the SMSGTE, I got a sudden call (yes, on my phone!) from ham in the nearby area congratulating me with figuring out digital stuff. Weirded me out back than, but now I think it was cool! And I think, I annoyed him with my test packets too.
  25. As a regular user of APRS on Ham band I have to chime in. The point of limited channels is very valid. Where I live, apparently some people already using GMRS/FRS channel for data telemetry. It's only mildly annoying now, but should everyone start using APRS (or other data) it's going to be detrimental to voice operations. APRS depends on a network of digipeaters, to be reliable and useful. I do not see it's to happen to GMRS ever in my lifetime. The new reserved data channel for FRS/GMRS? Yes!!! Where do I sign up. It could be one of the low power 467.xxx MHz channels or it could be a whole new 12KHz channel dedicated by FCC. Fat chance...
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