[Antennas] Change in coaz = change in SWR.

2002年10月26日 20:55:05 -0500

Try at least two other SWR meters before doing anything.
Sounds like you have changed from a relatively lossy coax to one with less
loss. That will cause the indicated SWR to increase. Also, if you are not
using a 1:1 current balun at the antenna feedpoint, you can have
common-mode current affecting the SWR/analyzer reading.
What type of antenna?
73/72, George 
Amateur Radio W5YR - the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489 Icom IC-765 #2349 Icom IC-756 PRO #2121
Thomas Beltran wrote:
>> I exchanged 100' feet of RG-58 with 100' of Cable X-Perts 1318FX. After
> checking the SWR with an RF-1, there is quite a difference - the resonant
> frequency of the antenna has gone up around 600 khz. For example, I had a
> 1.7:1 (checked just before changing the coax) at 14.230. Now that freq
> shows an SWR of 4:1. The low point, 1.3:1, is at 14.880. Before adjusting
> the antenna, I thought I would check with the people on this list. Any
> ideas? Tom W6EIJ