[Elecraft] KPA/100 displays wrong PS current (much lower)

[Ioannis Kassotakis]

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 <donwilh at embarqmail.com> 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 <donwilh at embarqmail.com <mailto:
>> donwilh at embarqmail.com>> 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