Josh,
Yes, DC measurements can be confusing - it all depends on the input and
output networks.
Rather than attempting to make that measurement at DC, connect your
antenna analyzer to the RF IN jack and a dummy load to the ANT jack.
73,
Don W3FPR
On 9/3/2014 5:41 PM, Josh Lehan wrote:
On 09/03/2014 03:17 AM, Kurt Pawlikowski wrote:
Josh,
Unfortunately, I'm not familiar enough with the KXPA100 to know if,
when bypassing the unit internally, there is DC continuity between the
input and output. If there is (I suspect so), you should be able to
measure between them with a regular ohm meter. While not 100%
definitive, if it fails this test (again, assuming DC continuity), that
would be a major indicator of some connection problem.
Good advice. I used a multimeter to measure for continuity. Yikes, the
tip and the ring of my "RX IN" jack appear to be shorted to each other,
and also shorted to ground! Is that normal?
I'm going to open it up and check the wires carefully on the panel where
the jacks are, hopefully nothing is touching.
I've heard that measuring antenna stuff at DC can be an illusion, as
some things are supposed to appear open or appear shorted at DC, as
they're designed to carry RF, not DC. My meter can only measure
resistance at DC, it can't do anything fancier (no capacitance or
inductance, no measuring resistance at AC/RF, no impedance or reactance).
Also, when the antenna is selected, the tip and the ring of "ANT 1" (or
"ANT 2" if selected) also appear to be shorted to each other and to
ground. The KXPA100 isolates the antenna that is *not* selected: its
ring is still shorted to ground, but its tip has no connection.
Josh
K6JSH
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