[Elecraft] K3 PA3 not working

[Don Wilhelm]

Grant,

I might also add that the wattmeter needs some forward power to compute 
the SWR from the reverse power.
So if there is no forward power, the SWR will be reported as 1:1.

73,
Don W3FPR

On 9/22/2018 6:53 PM, Grant Bright W5XB wrote:
> Many thanks Don,
>
> Good to know...the tx does ok at 12 watts, but when you turn the power up
> (hear the click), the power drops off to zero, and the swr disappear.
>
> I have a good Collins wattmeter, that shows the 12 watts fine...but I do
> have a dummy load. I'll have one tomorrow and try doing a calibration with
> the utility.
>
> If it is the KPA3, I hope I can pull it and send just it to Elecraft. I'll
> call Monday about that.
>
> Many thanks for your help.
>
> 73, Grant, W5XB
>
>
>
> -----Original Message-----
> From: Don Wilhelm [mailto:donwilh at embarqmail.com]
> Sent: Saturday, September 22, 2018 6:37 PM
> To: Grant Bright W5XB; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 PA3 not working
>
> Grant,
>
> Yes, the K3 uses the same power and SWR sensing for less than 12 watts
> and greater than 12 watts.
>
> It sounds like you have a non-functioning KPA3.
> You might want to check with an external wattmeter to be certain.
>
> 73,
> Don W3FPR
>
> On 9/22/2018 6:05 PM, Grant Bright W5XB wrote:
>> Hello All,
>>
>> Just received a new to me K3. Love all the features and ease of operation!
>>
>> Checking it out this afternoon, transmitting into a good swr, at 12 watts
> or
>> less, the output shows 12 watts and 1.2 SWR
>>
>> Turned up to 100 watts, the output shows 1 watt and no swr. Power supply
>> voltage and current no issue.
>>
>> Question: Does the 10 watt output and the PA3 share the same circuit for
>> return power (SWR) or are they different?
>