Jeremy,
You must remove the ribbon cable to the KPA100 to remove it from the
path - I suggest physically removing it from the EC2 enclosure just to
be safe. The fact that you had the KPA100 partly in the path during
your tests could create invalid observations.
Use a dummy load for testing rather than an antenna.
If you are getting funny SWR LED indications, the first suspect is D1
and D2 in the KAT100. Those are 1N5711 diodes, and if you have some in
your parts supply, I would just replace them. I know it is a 'bear' to
get to the solder side of the board when mounted in the EC2 enclosure,
so see if there is enough lead length above the board to break the
diodes and solder new ones in their place.
You would get a better picture of the operation of the KAT100 wattmeter
if you remove the KAT2 (just unplug it from the KIO2 AUX board). Then
connect the KAT100 control cable and connect the K2 lower panel BNC to
the KAT100 RF in.
The KAT100 will then respond like the KAT2 normally does and in ATU CALP
or CALS will show you the wattmeter readings - connect ANT1 to a dummy
load for that test. It is advisable to connect an inline wattmeter
between the KAT100 and the dummy load. If the internal wattmeter in the
KAT100 is not functioning properly you will be able to calibrate it.
73,
Don W3FPR
On 7/17/2015 1:05 PM, JeremyJones wrote:
After many months of flawless operation, my KAT100 is starting to have
trouble tuning up, particularly on 40 and 80M. It even has trouble tuning
up a 50 ohm dummy load on these bands.
My normal setup is a 10W K2 with a KAT2, connected on the ANT 1 port to the
AUX RF port of the KAT100 (mounted in an EC2 case with the KPA100). This is
internally connected to the KPA100. The RF out from the KPA100 is then
connected to the RF IN on the KAT100. ANT 1 is connected to a DX-CC and ANT
2 is connected to an 80M Carolina Windom.
The first signs of trouble started when the SWR LEDs only lit
intermittently. The ANTENNA and PWR RANGE LEDs lit and operated correctly.
Gradually I stared seeing higher and higher SWR readings.
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