Andrew,
FB on all of that.
Before doing anything else, remove the KPA100 and run the base K2 into a
dummy load. With the power at maximum, note the current draw during a
TUNE (press DISPLAY to see the voltage and current). Do that on 160 as
well as on 80 and 40 (to compare the current per band). If you receive
a HI CUR message, increase the CAL CUR setting (up to 4 amps) to see if
it goes away.
If the 160 meter power output and current draw is similar to the other
bands, then you can say the base K2 is OK and look for a problem in the
KPA100. (the current draw at max power will normally be lower on 40
meters). The problem can actually be in the base K2 160 meter LPF - the
above test will reveal it if present.
73,
Don W3FPR.
Andrew Lenton (Linux account) wrote:
Hi Don,
Ah very good point this rules out the low pass filter on the KPA 100,
as low power is OK. I only have this problem on 160, as 80 to 10 are fine
Th High current only show up on 160 M, the display on the K2 reads the
same on the external watt meter Bird through line. SO! symptoms below are:
1 Power on display matches Watt meter from 160 to 10 ( all be it
160 is 60 Watts Max)
2 Power from 80 to 10 max 111 Watts on display and meter, no high
current warning
3, Power after 60 watts on 160 I get high current warning
4, I did not disturbed R 26 it was covered by metal plate when I
removed the KPA100 to make way for the DSP, and the setting of R26
would also affect other bands
The Bird meter was calibrated this year with all its elements,
also I have more than one Watt meter, all say the same low power
on 160 and high current
Something must have been disturbed somewhere!! I guess?
73's
Andrew
On Sun, 2008-10-26 at 10:43 -0400, Don Wilhelm wrote:
Andrew,
If the KPA100 low pass filter were a problem it would misbehave at both
the low and high power ranges because it is always in the circuit with
the KPA100 connected.
A "Hi Cur" message means the *base K2* is drawing current in excess of
the CAL CUR setting, and the power will be reduced to control the current.
If the HI CUR message only shows up when driving the KPA100, then I
would look for a problem in the input of the KPA100, or mis-calibration
of the wattmeter in the KPA100. If you bumped the setting for R26 while
working on the KPA100, that in itself may be sufficient to explain the
HI CUR indication. Did you measure the actual power output with an
external wattmeter or are you depending on the K2 display? If the
internal wattmeter is not properly calibrated, the actual power output
can be much greater than indicated by the K2.
73,
Don W3FPR
Andrew Lenton wrote:
> Hi Don,
>
> Thanks for that, Putting aside the K2's low power on 160, which no doubt has
> a component error value somewhere, the KPA 100 has been working at 111 Watts
> for two years until I disturbed the PA last week to make way for the DSP
> board. So something has happened to the KPA100. I only get a high current
> warning when the KPA100 is in use. 80 to 10 Metres is fine 11 watts no
> warnings! I think something has happened to the high power low pass filter,
> any thoughts?
>
> 73
>
> Andrew G8UUG
>
>
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