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Showing content with the highest reputation on 05/26/20 in all areas

  1. If his Fox News is on Cable channel 64, then you can't do anything about it. CATV Hyperband channel 64, no matter whether it's NTSC analog or ATSC QAM Digital, covers a 6MHz wide bandwidth between 462 and 468MHz. If you transmit anywhere in there, (GMRS) it will overload the TV or converter box. Likewise, if you are transmitting in the 70cm ham band, depending on what frequency you are using, you will wipe out Cable channel 59, 60, or 61. the 2-Meter ham band rides on the same band as Cable channel 18, and MURS will wipe out channel 19. NOTE: Cable channels above 14 are NOT the same frequencies as over-the-air TV channels above 14. Also note that with digital TV, the station can display whatever "virtual channel" they want you to see. Perhaps your local CBS affiliate still advertises themselves as "News-4", even though they switched to RF channel 27 over 19 years ago. Cable systems like to call digital channels much higher numbers such as "Hyper-tier 653" because it makes them sound bigger than they actually are - makes you think they have more channels out there that you just don't pay enough to get. Here is a list of actual frequencies vs. channel numbers for Standard, IRC, and HRC type cable systems, along with standard over-the-air broadcast. https://www.jneuhaus.com/fccindex/cablech.html The visual carrier frequency is shown in this chart. TV is transmitted in Vestigial Sideband mode, meaning a full carrier and upper sideband, but the lower sideband is rolled off 1MHz below the carrier. The lower edge of the channel is 1.25 MHz below the visual carrier and the upper edge is 4.75 MHz above the visual carrier.
    3 points
  2. We're working on a new website and this will be one of the first "new" features once it's rolled out. There will be a voting system where people can indicate whether a given repeater is online or not. Using this information, we can get rid of the offline and outdated systems. Right now, we hide anything older than a year from the map page, but that's not perfect. There are systems that haven't been updated in a long time that are still on the air, and some that were listed more recently that are already gone. I think this voting system will be the better way to handle it unless someone has better suggestions. I think requiring someone to log in every year to update the listing is difficult to do, and risks hiding good stuff out there. We could also handle signal reports through this system so you can get feedback on where people are reaching it from and the signal quality.
    1 point
  3. I did experience a massive problem with any RF transmitter if the antenna was mounted on the swing gate. Every time I keyed up, my dash would do a hard reboot, my windshield wipers would turn on and my climate control would turn off for a quick second. The problem was that I ran dual tops. When the soft top was on, I had no issues. However, when the hard top was on, the antenna was so close to the back window that is would send a ton of RFI into the Jeep through the rear window defogger and rear windshield wiper assembly. My solution was to leave the back window electronics completely unplugged unless it was snowing or we had very heavy rain, and not use that radio when they were plugged in. Any radios that went through antennas mounted on the hood were fine. When the hard top was off, it was fine. I ran 180 watt amp most days... occasionally up to 500 watts.
    1 point
  4. No. The issue he most likely saw was a bad antenna install. I run a 110 watt APX in VHF and a 45 watt APX in UHF on my JK with no issues.
    1 point
  5. gortex2

    High SWR Readings

    I use the same mount on my JK but with a 1/4 wave UHF whip and see barely enough reflected to worry about. the one thing I did do when installing was grind the paint from the bottom of the bracket as the NMO was not even getting a ground prior. Check with a DVM to see if you have a good ground. I did try a gain style antenna but like the short whip.
    1 point
  6. berkinet

    Impressed with CCR's

    Keep in mind that the 22 FRS and GMRS (simplex) channels are the same frequencies. So, you really can’t tell if any given transmission is one service or the other. Unless, of course, they ID with their GMRS license.
    1 point
  7. marcspaz

    High SWR Readings

    I would have to check my notes about the JK. I won't run a radio if I have anything higher than a 1.5:1. On the Gladiator, it floats between 1.1 and 1.2 depending on weather. It was somewhat directional. On the blind side, off the back, the simplex range was just less than if I am driving toward the other station. The SWR was fine and I could work repeaters 20+ miles away with no issues. It's my go-to antenna when I'm going 4-wheeling.
    1 point
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