Tyler,
Your results are unusual.
Remove the KAT2. Does the base K2 still work OK? If not, something has
happened in the meantime.
It would seem that you do not have a good path between the K2 and the
antenna (or perhaps a short to ground).
Check the KAT2 carefully for solder bridges.
With the KAT2 in CAL P mode, you should have zero ohms resistance
between the center conductor of the input coax and he ANT1 jack of the
KAT2. ANT1 (with the KAT2 in CALP or CALs mode).
73,
Don W3FPR
On 7/27/2013 10:34 PM, Tyler Barnett wrote:
I've been working very slowly on a KAT2, and everything was going well and
checking out correctly.
All the relays are working, and I finally arrived at the C55 Bridge Null
Adjustment step.
When I put the K2 into TUNE, I got a "Hi Curr" on the panel, and no output
power.
Not only that, but an antenna connected to port 1 of the ATU doesn't hear any
signals.
A few steps beyond this it asks me to check pin 1 of U4 (LM358) for 0 volts
during receive, which is OK.
During TUNE, the voltage isn't 3-4 volts, it's like 0.7 volts.
Oh....and then I realized that I had already installed R6 earlier, instead of
after the voltage check.
The shield coax of J7 is closer to the side panel of the K2 when plugged into
J6, per the supplied addendum note.
I was very careful taking the bottom cover off, and restoring the PA screws and
washers.
This was done to install a new J6, which was installed backwards by the
previous owner.
The resistance between ground and the collector of both PA transistors is 87
ohms.
The KAT2 manual says this should be higher than 100 ohms, so I don't know if
this is substantial or not.
At this point, I'm stumped. Comments welcome.
BTW, before I installed the KAT2, the K2 worked perfectly.
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