[Elecraft] K3 Hi current display

[Russ]

Scott;

Thanks, I guess I'll have to wait until Gary gets back.  My voltage readings 
are all OKand I've tried a reload of the firmware 3 times with no luck.

Russ N3CO
----- Original Message ----- 
From: "Scott Ellington" <sdelling at facstaff.wisc.edu>
To: "Russ" <erusst at att.net>
Sent: Tuesday, March 15, 2011 4:04 PM
Subject: Re: [Elecraft] K3 Hi current display


> Russ,
>
> Gary is out of town for a few days.
>
> If your other voltages are reading OK (12 V, SWR, etc.), I would suspect a 
> firmware problems.  (I've had to reload the MCU code on my K3 a couple 
> times to fix other problems.)
>
> I also had some trouble with a KPAIO3 board that was reading KPA3 current 
> way too high.  Replacing the board solved that problem.  In your case, 
> with the KPA3 removed, or power set below 12W, the K3 shouldn't even be 
> looking at the KPAIO3 sensor.
>
> 73,
>
> Scott  K9MA
>
>
>
>
> On Mar 15, 2011, at 2:43 PM, Russ wrote:
>
>> I recently repaired my K3 LPA by replacing one of the output MOSFETS and
>> making other modifications per Gary Surrency.  I had to re-adjust the 
>> bias
>> on the finals using an external ammeter and was able to complete that
>> successfully.  The LPA now puts out the full 12W.  However, the front 
>> panel
>> display shows that  the K3 is always drawing aroung 24A when I know it is
>> less than 1A on the external meter.  The reading is the same whether or 
>> not
>> I have the KPA3 installed.  I still haven't had a response from Gary so I
>> thought I'd ask if anyone else has seen this.  I have checked the output 
>> of
>> the current sense  U1 and it is correct.
>>
>> Anyone have any ideas???
>>
>> Thanks,
>> Russ
>> N3CO
>>
>>
>
> Scott Ellington
> Madison, Wisconsin
> USA
>
>
>