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Does high SWR affect reception?
Simplified answer: There is no relationship between SWR and receive performance. There is one condition for this simplification to be true: the received RF noise floor must be above your receiver’s noise floor.
What would a high SWR indicate?
For instance a SWR too high (over 3:1) all over the band can be an indication of a bad part or junction, poor ground or poor location. An SWR too low over the whole band (1:1 for all 40 channels) can indicate a low efficiency antenna or lossy component. We EXPECT a high quality “short” antenna to be narrow banded.
Why does my CB antenna have high SWR?
If your coax cable has an open – that is, the wire is broken and current can’t flow through it – you’ll get off-the-chart SWR readings. Follow this guide to test your CB coax for problems. Just like potential coax problems, if the wire in your antenna is broken you’ll experience high SWR.
Why does the SWR of a transmitter always go up?
It may seem strange that the system is resonant and still has reflections due to mismatched impedance, but the coax and antenna are not the same impedance. Actually, except for the losses in the coax, 100% of the energy that leaves the transmitter will be radiated out of the antenna, no matter how high the SWR, because of the re-reflection.
How tall does an antenna have to be to Show SWR?
Plotting SWR over frequency you should be able to determine if the antenna is simply too long or too short. I’d also note that 19 feet up for a 40 meter antenna is not very high. See how antenna height determines the radiation pattern.
Why does a high SWR create a higher loss?
Actually, except for the losses in the coax, 100% of the energy that leaves the transmitter will be radiated out of the antenna, no matter how high the SWR, because of the re-reflection. A high SWR will create a higher loss in the coax because a higher amount of energy travels backwards in the coax.