High SWR

[novakor]

Need help lowering SWR on an icom 2100. I have it mounted in my truck and my SWR is 4.1 to 1, so would i need lenghten my antenna to bring down resonant frequency or is it the other way around?

 

[2M Guy]

You need to check at 144 and 148 first. High at 148, low at 144, shorten. Other way round, lenghten.

 

[W5LZ]

With the information given there is absolutely no way of telling what you need to do to correct the problem. I would suggest trying to determine if your antenna is too long or too short by the 'normal' methods. Then, procede from there.
- 'Doc

 

[Master Chief]

If you have an antenna designed for 145 Mhz, you should not see a 4:1 match, even if it was out of band. Using an antenna cut for MURS (153.210) on 145.00 shows a high SWR, but no where near 4:1. You have other issues.

If you have a dummy load, check the radio into that first. If you have an analyzer, check the antenna, jiggle the coax, especially near the ends! See if the analyzer jumps around.

 

[novakor]

2mguy with your helpful info i was able to bring down swr to 1.5 near the lower end of band and 1.6 near higher end.

It took an hour triming antenna a little bit at a time to finally reach acceptable readings.Thanks and 73