06-27-2018, 09:05 PM
Join Date: May 2017
Curious SWR Readings
Took the hard top off and put the soft top on earlier this month. But I had tuned the CB antenna wsith the hardtop on and wanted to see what it would read on teh SWR meeting with hte soft top. I suspected it wouldn’t change a whit, but it actually did.
And I saw kind of a...curious...pattern in the SWR readings.
With the hard top, I was consistently getting a 1.5 to 1.8 reading between channels 1 and 40, with 40 being the higher and the tunable tip tightened down completely.
I put the soft top on, same antenna configuration, and after setting the SWR meter on FWD, I got a perfect 1.0 on Channel 1.
Up on Channel 40, I got a 2.0
Can’t reduce the length of the antenna any more, so I went to Channel 20 and took a reading after “zeroing” the meter. Solid 1.0
Curious, I went to Channel 30. Rinse, repeat, I get a 1.2 (No joke; I did the check four or five times).
Channel 35 I see a bump to 1.4
Channel 38, the SWR reads 1.8
Channel 39, it reads 1.9
Channel 40 reads 2.0
Went back down and started at Ch 1 again. Every channel up through 28 was a 1.0 and at 29 gets a 1.1 or 1.2
I’m going to do this again another day, this time with a pad of paper and pen.
Any ideas how to drop that upper end? Firestik says to cut the adjustment screw in half if the reading is high and the screw is bottomed out.