Posted by
Darwin, Keith on
Dec 06, 2006; 4:30pm
URL: http://elecraft.85.s1.nabble.com/KAT2-further-Questions-tp441630p441632.html
-----Original Message-----
From: Don Wilhelm
*snip*
You can do better calibration with a known dummy load and an RF Probe
than you can with most wattmeters -
----------------------------------
Here I need to confess my ignorance. I used the RF probe that came with
the K2 to measure K2 output into a dummy load. I got odd results.
The voltage would continually increase. It would start out at say 13
VDC. I'd measure for 20 or 30 seconds and it's count up to maybe 16
VDC. I'd back off and then put the probe back on the test point and it
would start at maybe 15.5 VDC and count up, going past 16 and
continuing.
I figured it might go through some rise time as the cap is charging but
I never saw it settle out at a value. What's up with that?
My dummy load is a TenTec. It's basically a big 50 ohm resistor. I've
measured it with the MFJ analyzer and it is flat SWR (50 + 0j ohms) to
60 MHz or so. I've NOT measured it after it heats up though and
probably should.
Does an RF probe measure RMS, peak, or peak to peak? So confusing ...
:-)
- Keith N1AS -
- K2 5411.ssb.100 -
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