Gerald,
What kind of antennas and feedlines (coax?) do you have? Does this happen on all
bands the same way? What modes are you using? It does sound like RF feedback.
If you can't easily move the feedlines and antennas away from the rig, I would start
filtering all the power leads and other wires going into the K3 using #77 or #43
ferrite cores (maybe 8 or 10 turns). Also, check your grounding. Do you have a
single point ground? Is everything well connected to it?
73 Martin AA6E
On 11/02/2013 12:15 AM, KC6CNN wrote:
I just read a message about a K3 that had turned off and he could not get it
to turn back on.
I have kinda the same issue but different.
I have my K3 connected to a Alpha 76pa amp. I operated it for several
months, then all a sudden I would transmit and the K3 would turn off. It
would not turn back on until the power supply was turned off and then back
on. I checked the Astron 35amp power supply and it is not "crow baring" The
voltage remains good and the SWR are fine. I changed coax cables, and even
changed antennas. The problem still keeps happening. I changed power
supplies and it still does it. I lowered the drive power on the K3 to 10
watts and tuned the Alpha. I was able to up the drive till the power was
around 300 watts. At 300 watts the K3 turned off again. This is repeatable
and always turns off around 300 watts. I took the amp to a friend and it
performed great. I hooked my station up again and took the antenna off and
ran it into a dummy load and it performed flawlessly. I even had the dummy
load sitting on the floor between the amp and K3 and it had no issues. I
have checked and do not get shocked or bitten by anything in the shack. I
hooked it back up and it still turns off. I am thinking that I might have a
rf feed back problem, but thought that it would have shown itself when the
dummy load was sitting close to the K3 at full legal power.
Has anyone had any experiences like this or any suggestions to help me out.
Thank you
Gerald
-----
KC6CNN - Gerald
K2 # 5486
K3 # 6254
KX3 # 757
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