![]() ![]() The best coax is made by Amphenol, Columbia and Belden, Typical examples, Belden 8240 or 8259 for RG 8/U, and 8214 or 9208 for RG 8/U. If the base antenna requires over about 50 feet of cable, then your best bet is RG 8/U foam dielectric. The difference in losses between the two types in such short lengths is impossible to notice at the receiving end of the signal. RG 8/U, unless you need more than about 30 feet, as in a very high base antenna installation. Now, FORGET all that stuff about power losses and don’t waste money on the “thick” stuff. The foam dielectric versions of both cables have slightly lower losses/foot than the standard coax, and both are slightly more expensive. ![]() RG 8/U:ġ) Used mostly for base station antennas Ģ) Lower power losses/foot than the “thin” stuff ģ) Good for about 1200 watts at CB frequencies Ĥ) About double the price/foot as the “thin” stuff. Here are the basic differences” RG 58/U:ġ) Used exclusively for mobile installation Ģ) Higher power loss/foot at CB frequencies than the “thick” stuff ģ) Maximum power about 400 watts at 27 MHz CB frequencies Ĥ) Cheaper than the “thick” stuff. Just be sure you are using one or the other. ![]() These cables are designation “50-ohm impedance. Some insulation around that inner wire called a “dielectric”, which is typically polyethylene or plastic foam, and a braided shield tightly is woven around the dielectric, all covered by a tough vinyl coating. Coax cables consist of a solid or stranded inner wire. The numbers are actually military designations and are meaningless for our purposes. Recommended: Tuning the CB Antenna for Optimum SWR There are basically two kinds of CB communications:ġ) RG 58/U or 58/U Foam. Assuming the radio is working properly and the coax cable has good connections at both ends, the weakest link in the chain is the antenna. The difference in material used is simply a matter of efficiency, the more efficient the antenna, the further you will get out.Īs you can see in the below picture, there are 3 links in the chain between your CB radio and the CB radio at the receiving end. And of course, a piece of wire is an antenna. Very simply stated, an “ antenna” is any which is capable of sending out or picking up radios signals. Therefore, Radios guide must insist that you forgot everything, ABSOLUTELY EVERYTHING that has been passed on to you about SWR. But the most blame must be placed on CBers themselves, who just blindly go along with everything their buddies tell them without stopping to check it out for themselves. So, they help perpetuate the same old myths. This is partly due to the rash of articles about SWR published in the various electronics magazines which are poorly researched and written by people who simply DO NOT KNOW WHAT THEY ARE TALKING ABOUT. This is unquestionably the least understood area in the entire CB radio world. By now you have no doubt heard all kinds of garbage about “SWR” and don’t know who or what to believe. ![]()
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