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<blockquote data-quote="TimeFlipper" data-source="post: 217849" data-attributes="member: 6456"><p>CB radios and all amateur radio tranceivers have a 50 ohm output into a resonant antenna length...For example, most CB sets around the world have pre set frequency channels within the 27mhz radio frequency band and every professionally constructed CB antenna is in close resonance to the CB radio and due to slight frequency changes within channels will have at least a 1 to 2 standing wave ratio (SWR) antenna efficiency...A 1 to 1 SWR is a perfect resonant antenna match to the CB set..</p><p></p><p>There are CB SWR meters you can buy that tell you what your own antenna SWR is and can be adjusted down to a 1 to 1 SWR level...However, that 1 to 1 SWR level doesnt mean the antenna is operating at maximum efficiency, it means the CB set only "sees" the 1 to 1 SWR which protects it from high SWR readings that will blow out the front end of the CB set..</p><p></p><p>Every amateur radio operator should always check out their own antennas SWR readings on low power BEFORE transmitting on full power...Sometimes old antennas break down and short out which will cause high SWR readings leading to expensive repairs!!...When making antennas, the resonant length of it can be worked out by simply dividing the frequency into 300...For example, if i want to make a full wave dipole to operate highly efficiently with a 1 to 1 SWR on 30mhz, its 300/30=10 meters...The 10 meters refers to the length of the antenna wire..</p></blockquote><p></p>
[QUOTE="TimeFlipper, post: 217849, member: 6456"] CB radios and all amateur radio tranceivers have a 50 ohm output into a resonant antenna length...For example, most CB sets around the world have pre set frequency channels within the 27mhz radio frequency band and every professionally constructed CB antenna is in close resonance to the CB radio and due to slight frequency changes within channels will have at least a 1 to 2 standing wave ratio (SWR) antenna efficiency...A 1 to 1 SWR is a perfect resonant antenna match to the CB set.. There are CB SWR meters you can buy that tell you what your own antenna SWR is and can be adjusted down to a 1 to 1 SWR level...However, that 1 to 1 SWR level doesnt mean the antenna is operating at maximum efficiency, it means the CB set only "sees" the 1 to 1 SWR which protects it from high SWR readings that will blow out the front end of the CB set.. Every amateur radio operator should always check out their own antennas SWR readings on low power BEFORE transmitting on full power...Sometimes old antennas break down and short out which will cause high SWR readings leading to expensive repairs!!...When making antennas, the resonant length of it can be worked out by simply dividing the frequency into 300...For example, if i want to make a full wave dipole to operate highly efficiently with a 1 to 1 SWR on 30mhz, its 300/30=10 meters...The 10 meters refers to the length of the antenna wire.. [/QUOTE]
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