Ioannis,
Back the CAL CUR down to 3.50.
It may be that you will have Hi Cur messages if you turn the POWER knob
to full clockwise, but if you set the power control at 100 watts, that
message should not appear.
If it does, check the connections from the power supply to the
K2/KPA100. If the voltage at the K2 (observe with the K2 voltage
display) drops significantly during keydown, that could explain the Hi
Cur warnings. Tighten the power supply terminals and check to be certain
the APP connector is properly assembled with the connector blades fully
inserted. If you look at the end of the APP connector and can see the
spring blades that normally lock the contact blade, the contact blade
has not been fully inserted and will not make full contact (and cause a
significant voltage drop).
If you can increase your power supply voltage to 14.3 volts or above,
you should increase the voltage. The K2 will operate with voltages up
to 15 volts. For linearity and best transmit IMD, the higher the
voltage, the better.
73,
Don W3FPR
On 4/24/2016 4:07 PM, Ioannis Kassotakis wrote:
Thanks Don,
I understand that the PS current reading is only for the Base K2.
I will rely on the bench PS display to read the 13.8 DC current.
I have already set the CAL CUR to 3.8 Amps so that I do not get HI CUR
alert at 10 Watts.
73,
Ioannis PA1EQP
On Sunday, 24 April 2016, Don Wilhelm <[email protected]
<mailto:[email protected]>> wrote:
The current display on the K2 is only for the current used by the
base K2. I use it when testing the K2 for 'good health' and
normal RF Gain, but during operating I see no need to monitor it
on a regular basis.
The Base K2 will indicate Hi Cur if the current draw goes above
the value set by the CAL CUR parameter, and will reduce power if
that occurs. Should you continue to get Hi Cur messages, that is
an indication of something that should be investigated.
73,
Don W3FPR
On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote:
Thanks Don,
That means that at HI PWR (>11 Watts) should disregard the
displayed PS current figures.
I thought that KPA100 processor would communicate the I Sense
back to the MCU and display the correct current figure after
rescaling. I understand that is not the case.
73,
Ioannis PA1EQP
On Sunday, 24 April 2016, Don Wilhelm <[email protected]
<mailto:[email protected]>> wrote:
Ioannis,
The current display on the K2 indicates only the current
for the
base K2, not for the K2 and KPA100 combination.
That is why you set the CAL CUR to 3.50 amps even though the
KPA100 will draw much more current.
Yes, the KPA100 does have a scaling on the amount of RF
voltage
that is being detected. That is used for power control
and has
nothing to do with the current displayed. The result of that
voltage is sent to the VRFDET signal in the K2 (Voltage of
the RF
Detected).
73,
Don W3FPR
--
Ioannis Kassotakis
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