[Elecraft] P3 abnormal shut off problem

[Tom Azlin W7SUA]

Hi Don,

I do have the SVGA option installed but do not remember upgrading the K3 
for 1 amp. Not sure how I missed that upgrade. So in a few weeks will be 
opening up my K3 to check that and if not there putting in the upgrade.

Thanks for your advice.

73, tom w7sua

On 10/28/2019 9:10 PM, Don Wilhelm wrote:
> Tom,
> 
> If you have not yet made the K3 switch to the 1 amp output, that alone 
> could explain the problem, especially if you have the SVGA option in 
> your P3.  The 0.5 amp source is marginal in the P3 without any options.
> 
> 73,
> Don W3FPR
> 
> On 10/28/2019 11:17 PM, Tom Azlin W7SUA wrote:
>> Thanks Don.
>>
>> I measured the power supply sag at the power supply to be about 0.05 
>> volts. Replaced the cables with larger gauge and still had a problem, 
>> perhaps internal to the K3. Switched to feeding the P3 directly from 
>> the power supply ( an Astron 70, but switch to Alinco 50 amp with same 
>> results) and now the P3 is rock solid. I did order the K3 mod to raise 
>> the current limit from 0.5 to 1 amp as suggested by Elecraft. And will 
>> be making that Aux DC out to P3 cable of heaver gauge.