[1000mp] Different SWR at SSB and CW

[Pete Smith]

At 11:38 PM 6/6/2004, you wrote:
>It looks like a Power has a different reading as well.Not sure TRCVR read 
>PEP or AVG.In AVG it
>would read actually less.
>I made this test on 50 Ohm load and confused with results.
>Not sure it's normal.I talked to my friend that has a 1000MP Field and he 
>has a difference in
>about 0.1 between SWR and CW.
>Even that's OK,it's a little bit bother me when I use SSB.Not sure I saw 
>it before.


I recall reading, a year or so ago on this list, a description of how the 
Mark Vs calculate power and SWR.  I don't recall the specifics, but I don't 
believe they use a straightforward directional coupler circuit.  So it 
could be that you have a combination of problems, with both internal and 
external meters displaying some nonlinearity in response to different power 
levels.  My VFD RF Power/SWR meter, while very nice in most respects, 
always shows a higher SWR at high power (~1.2 KW) than at low power (100 
watts).  The difference is on the order of 1.4:1 vs 1.2:1.

73, Pete N4ZR
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