OK that could be done, I will experiment further when
I do get some time. I know I have checked the PS voltage
but dont remember what it was, have to go down into the
basement and check. Now checked, it´s 13.88 at 100W and
13.84V at 120W.
IMD comes up 8dB at 120W compared with 100W. Stays pritty
much flat betwen 10-100W. At 100W K3 is about 10 dB worse
then a FT-1000D at full 200W. And for kicks a Collins
KWM-2 is 10 dB better then the FT-1000D. What I measure
is the fully modulated envelope and scan 10 kHz up/dwn
from center frequency. That is, what interests me is
how the radios looks 5 kHz up/down from center frequency,
i e adjacent channel IMD if I call it that.
If I would have been the designer I would never have
allowed above 100W PEP SSB, CW of course is OK.
Merry Christmas / Jim
----------------------------
Bill W4ZV wrote:
Jan Erik Holm wrote:
After measuring the TX IMD on SSB I stopped putting the
radio above 100W.
Jim try setting your power supply so you have 13.8-14.0V key down at maximum
power and see if that helps the IMD some.
73, Bill
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