[Elecraft] KXPA100 not making antenna connection

[Don Wilhelm]

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
>
>
>