Don -
Yup, looks like a power supply issue.
K2 Meter V I
Receive 13.7 0.34
12 watts 12.6 2.78
13 watts 11.8 4.38
14+ watts 11.3 5.10
Making up a heftier cord to the power supply should do the trick.
Many thanks!
73 de K1ESE
John
Don Wilhelm wrote:
John,
How much power is actually being produced? What does the K2 meter indicate
in TUNE?
What is your power supply voltage under this 4.5 amp load? If the voltage
drops significantly, the current will go up - the K2 tries to provide the
requested power out, and if the voltage drops, the current must increase.
If you can eliminate power supply voltage drop problems, then you could have
some sort of oscillation present. The K2 is quite stable if all the
components are correct. You could start by checking T1, T2 and T4
(especially T4). The only other thing that I can think of right now are the
components in the base circuit of Q7 and Q8, but I cannot relate to a jump
in current draw if those components were at fault.
Check th evoltage on the base of Q7 and Q8 when transmitting - it should be
0.6 volts or very close.
73,
Don W3FPR
-----Original Message-----
While waiting for parts to fix my KPA100 and KAT100, I was checking out
my K160RX.
The situation is that at 12W out the K2 (KSB2, KNB2, KDSP2, K106RX,
KIO2) draws 2.5 amps. With power set at anything above that, it exceeds
4.5 amps and I get a Hi CUR warning (limit set at 4.5 amps).
Current is a bit higher than expected on 80 meters at 3.2 amps max
output. Other bands 2.9 - 2.9 amps.
I wonder what would cause the jump?
73 de K1ESE
John
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