swr rise only on one end with power

[Splash1]

on channel 40 the swr is fairly flat even when i turn the variable power all the way up to 100 watts on the 2970n2 ..on channel 1 the swr is just a hair higher until i turn the variable power up,then the swr goes clear up to a 2..why does the extra power maske a difference on one channel and not the other ?

 

[dudmuck]

on channel 40 the swr is fairly flat even when i turn the variable power all the way up to 100 watts on the 2970n2 ..on channel 1 the swr is just a hair higher until i turn the variable power up,then the swr goes clear up to a 2..why does the extra power maske a difference on one channel and not the other ?

Does your swr meter require calibration step before reading swr?

If so, you should again do the calibration step after changing tx power.

 

[Splash1]

Dudmuck..i,ll certainly give that a try..i never thought of that,,thanks..

 

[Splash1]

dudmuck..just tried calibrating with the power all the way up but no change at all with the swr,,still at a 2 unless i turn the power down..o, well ,back to the drawing board.

 

[Splash1]

would the fact that the radio has a built in linear have anything to do with it ?