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Showing content with the highest reputation on 06/28/21 in all areas

  1. I've experimented with a thin walled fiberglass mast in a heavy duty speaker tripod mount for a temporary setup. There is an AL-800 dual band telescoping antenna on the top. The top tubing section was a bit thin so I removed. As it is now I get the antenna up about 20 feet when mounted on the tripod. If its a bit windy a few 6 inch tent stake spikes with some nylon cord works to guy the mast so it doesn't blow over. https://www.dxengineering.com/parts/mfj-1911 The antenna seems to match up OK on the GMRS channels when the coax is attached. No ground plane is needed thus reducing the wind load. https://www.dxengineering.com/parts/pry-al-800 The mast pops out of the tripod and will collapse to about 4 feet. The tripod folds up to about the same dimension. Without any guy wires I can setup the whole thing in about 10 minutes. I ran RG-58 cable up to the antenna. While a bit high on losses it is light weight and I'm not running the cable far anyway. I made the trade off with higher losses to get a light weight easy to setup and transport portable antenna system. If I have to I can use a 30 to 40 watt FM only amp that needs 4 to 5 watts drive power from an HT while drawing maybe at most 6 to 7 amps DC current, low enough to supply from a modest sized 12 volt battery. For Ham use a Mirage dual band BD-35 amps works. For GMRS a wide band amp is necessary. One from BTECH will work, however it is not Part 95 certified. https://www.dxengineering.com/parts/mir-bd-35 https://www.miklor.com/COM/Review_DMR-Amps.php https://baofengtech.com/product/amp-u25d/ If you look around you can find good deals on the above used. I picked up a BD-35 and a U25D for $100 total at a recent Ham Radio flea Market.
    1 point
  2. I will be running 50w UHF and VHF, 50w GMRS. I will let you know once it is operational. I may not have it installed for two weeks. I do expect some desensitization of the listening receiver while I am transmitting on the other service, but nothing that I expect will affect my operations. I will have ferrite chokes on the GMRS feed-line to cut down on the noise and reduce ingress from the 2m/70cm since that line will be running parallel to the amateur antenna. Michael WRHS965 KE8PLM
    1 point
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