What happens when SWR high?
If the SWR is too high, not only is the performance of your CB seriously hindered, but you run a very high risk of damaging your radio. You need to make sure that there isn’t too much power being reflected back into the radio through the feedline from the antenna, which prevents the proper signal output.
What is the interaction between high standing wave ratio SWR and transmission line loss?
What is the interaction between high standing wave ratio (SWR) and transmission line loss? If transmission line is lossy, high SWR will increase the loss. Simply put, an SWR reading measures match between transmitter, feedline, and antenna.
Why does SWR go up with power?
If you are at low power, you may have enough feedline loss such that your meter can’t detect the amount of actual reflected power. Increase the power over a certain threshold, and the meter can begin to detect reflected power, with a subsequent “change” in SWR.
Which is better low loss or high loss feed lines?
As you probably guessed, low-loss feed lines are more expensive. Some of the low-loss feed lines are also rigid and hard to work with (they don’t bend easily). A little planning and common sense goes a long way when it comes to selecting feed line.
Which is feed line should you use at your station?
At HF frequencies, the loss in ladder line is so low, you can still see good results even when the SWR is horrendous. The antenna tuner provides the 50 ohm match to your radio and you really don’t care what the SWR is between the tuner and the antenna. So which type of feed line should you use at your station?
What are the losses in a feed system?
The feed system permits very efficient coupling of power in to the antenna itself, but the resistive and radiative losses are all quite low, requiring a spectacularly high circulating power to achieve equilibrium.
How is coax loss derived in a feed line?
The coax loss is derived not to the power fed in, but this average “circulating” power on the line. The same principle dictates how a two wire feed line would behave, with each partially reflected cycle adding to the average circulating current.