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SWR higher on SSB

Davidbt

Member
Joined
Aug 21, 2024
Messages
127
Location
Sierra Vista, Arizona
Not sure where you're grounded, but I had the best ground on one of the seat bolts, where the seat attaches to the floor of the cab.
I never did figure out why it shows higher swr on the radio, but at full power, max swr was 1.7:1 while barefoot was 1.1:1

I ran it without any issue until I moved the radio into the office and threw up a base antenna.
Just be sure to tune it as flat as you can at 4w and it should be fine.
I finally got my swr's down to 1.3-1.5 across the am bands with the help of @niceguy71. Basically the magnet wasn't sitting flat on roof of my truck.
 

Varmonter

Member
Joined
Jun 24, 2022
Messages
66
Location
Anywhere usa
I have a question. Does an swr protection circuit only read reflected power? If so could an swr meter in line attenuate some of that reflected power causing the original posters radio to not shut down..this would explain why it was fine when he put the meter in line??
 

paulears

Member
Joined
Oct 14, 2015
Messages
897
Location
Lowestoft - UK
Yes - perfectly possible but a meter than actually attenuated would hardly be a good product, would it! It would attenuate reflected AND forward power by the same amount.
 
Joined
Nov 1, 2023
Messages
53
I don’t know if Backwoods40 ever solved his problem. I scanned through the thread again and didn’t see where he had. After reading one of his posts where it fixed itself when he had the external meter inline, but then later high again with the meter in line, I’m pretty sure he got his answer the first response!!!!

So many different manufacturers supply SO239 and 259 these days and they are by no means standardized. I’ve run into this like 3 times in the last couple of years. Connection will appear tight no play but the ground connection is not sound.

Same symptoms he described. Only shows its ugly head with increased power. A manufacture 1:1 balun I have the threads on the so239 were slightly to short. Erratic SWRs with modulation.

I brought down a 3 element Yagi I made that I had up and was using when the same problem occurred. Tore it all apart thinking maybe it was a design problem. It was the SO239 bulkhead connector on the balun that was the issue. I replaced that part with one with deeper threads and all good.
 

slowmover

Active Member
Joined
Aug 4, 2020
Messages
2,815
Location
Fort Worth
I don’t know if Backwoods40 ever solved his problem. I scanned through the thread again and didn’t see where he had. After reading one of his posts where it fixed itself when he had the external meter inline, but then later high again with the meter in line, I’m pretty sure he got his answer the first response!!!!

So many different manufacturers supply SO239 and 259 these days and they are by no means standardized. I’ve run into this like 3 times in the last couple of years. Connection will appear tight no play but the ground connection is not sound.

Same symptoms he described. Only shows its ugly head with increased power. A manufacture 1:1 balun I have the threads on the so239 were slightly to short. Erratic SWRs with modulation.

I brought down a 3 element Yagi I made that I had up and was using when the same problem occurred. Tore it all apart thinking maybe it was a design problem. It was the SO239 bulkhead connector on the balun that was the issue. I replaced that part with one with deeper threads and all good.

There’s an answer from Master Yoda.

Takes awhile to get up on plane.
When achieved, some problems fade . . . .

.
 
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