Tip & How-To about Radio Communications
I have experimented for many years with various antennas and gain in the frequencies 26.965 to 27.405mhz. I have found that best performances on the Citizens Band is upper channels 37 or 39. This is where the band gets quieter and more close to Fm type communicating. Performance in antenna and hearing is best here. The Antron A99 sitting just 15 feet will get you 50 miles with decent results on a cheap Cobra 19plus or Cobra 21LTD. I can tell you by fact that a Cobra 21Ltd is equal to Cobra 25Ltd's(don't let noone tell you different) Its the same board, same calibration, same wattage plus its about $15 or so dollars cheaper than. Antennas have to be set for your frequency. I have found that the 8.5 ft(102 inch) steel whip performs best at approximate Channel #37 to 40. Homemade antennas built with a 8.25 ft element and 2 8foot rods down the side(ground) with a rod crossing the bottom at 1.5 feet. In the shape of a womans skirt.( Do not let the ground "skirt" touch the pole,seperate it by plastic PVC or milk jug with trash bag ties) I got 50 to 60 miles with this homemade job I would say had a DB gain of 10dbi. I have built home antennas that outperform Antrons. To be safe though and quick to setup is Antron A99 for about $65. Antrons have already set the frequency and low SWR. !!!DO NOT TUNE ANTRON A99 - IT BREAKS INTERNALLY!!! The average range one can get is say 10 to 50 miles average(best at night 10pm to 3 am) Don't expect any better with a Superior radio and tower or linear. A linear may kick hard within 25 miles but after that it fades into low in the distance. Unless you use 10 kilowatt or 25 Kilowatts(Electric bill will increase by $300 more--who needs it) A good power Mic on a straight radio Cobra 21LTD or 25 Ltd will be better than any mid-size linear say up to 250 watts. Your radio itself has potential with antenna gain of equal 25 to 45 watts alone. Mathematically your best with a Super Antenna and Height above 35 feet, plus heavy grounding(chain link fence buried into earth 20 X 20 feet about 8 feet down(a rod 8ft also will work) or if possible a Junk car buried into earth 8-10 feet under your Antenna. Use heavy gauge thick LOWLOSS 50 ohm coax 95% shield less than 100 feet to achieve max power out. Lengths in coax are great at 9,18,27,36 up to 72 feet(No higher than needed) The old timers swear by 72 feet. Antenna Height say: 45 feet tower with 72 feet of Coax is the usual Base setup. FCC restricts antenna towers to 60 feet above ground. No more than 20 feet above your house somewhat(when attached to house roof). No need to put $10,000 dollars in a setup with no more range than others. A mobile radio(Tuned) with Antron A99 will about outdo all Base station radios. Hope this helps you. 73's to you all.
Posted by Steve... on
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