[Elecraft] [P3] P3 woes - repaired but now claims my K3s puts out 873W!

[Fred Jensen]

It's always seemed to me that Poynting's Vector is the most aptly named 
entity in mathematics.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Edward Mccann wrote on 4/7/2023 7:41 PM:
> Dave:
>
> You may have redefined Poynting’s Theorem!
>
> Ed McCann
>
>> On Apr 7, 2023, at 6:23 PM, Dave New, N8SBE<n8sbe at densbe.com>  wrote:
>>
>> Don,
>>
>> The KPA500 (and K3s) both show the correct wattage - 100W barefoot and about 26W out of the K3s when the KPA500 is inline, and about 500W out of the KPA500.
>>
>> I tried changing the P3 SensorCal value from 500 (default) to 350 (min) but that only dropped the wattage shown by a little less than half.
>>
>> 73,
>> -- Dave, N8SBE
>>
>>> On 2023-04-07 16:48, W3FPR wrote:
>>> Dave,
>>> What power is displayed on the KPA500?  The KPA500 would fault if
>>> indeed the K3s is putting out that much power.  The KPA500 power bar
>>> is pretty accurate, just a bit coarse in its increments.
>>> I think a power calibration is in order for the P3 power indicator.
>>> 73,
>>> Don W3FPR
>>>> On 4/7/2023 2:12 PM, Dave New, N8SBE wrote:
>>>> So, I was the guy that had a P3 display/boot problem recently.
>>>> I sent it to the mother ship for repair, and they found that (get this) the 12V supply was shorted to the 3.3V supply (eep!).
>>>> So, a new(er) I/O board (which contains the supplies) and a replacement blown 3.3V LCD controller later, I have an (almost) fully functional P3 again.
>>>> EXCEPT, the TX Monitor function is now funky.  It claims that my K3s is putting out 873 (or so) watts!  I've tried both sensors (I had a 200W HF sensor on the shelf since I added a KPA500 and changed to a 2KW HF sensor), and although the scale max changes on the P3 display when I change sensors, it still way overstates my output power.  The KPA500 is showing 1360 watts on the P3!
>>>> I unplugged/re-plugged everything, did a visual inspection of the TX Monitor adapter board under a lighted magnifying glass, looking for missing/broken SMD resistors or caps, but so far no soap.
>>>> I'm wondering if the new revision I/O board is somehow incompatible with the older TX Monitor board, or maybe there is a missing 1M-ohm resistor to ground on the I/O board at the sensor connector, or an incorrect series resistor value there.
>>>> And yes, I sent a note to support, but I haven't heard back, yet. Wondering if anyone (Alan?) has any ideas where this behavior is coming from.  The wattmeter in both my K3s and KPA500 are working normally.  It's just the P3 wattmeter that's gone off the deep end, now.
>>>> Thanks, and 73,
>>>> -- Dave, N8SBE
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