[Elecraft] K3S Data Mode Question

[Don Wilhelm]

Tom,

Another thought - take a look at the DC voltage in the VFO B alternate 
display.
If your voltage is dropping much below 12.5 volts, that might be the 
problem.

Should that be the problem, check your power supply output, it should be 
13.8 volts or higher - preferably 14.3 volts or more.
All power supply connections should be tight to reduce voltage drop.
Run the power cable directly from the power supply to the K3.  If you 
use a "Rigrunner" or similar DC distribution device, use it for powering 
accessories and not the K3.  A fused Rigrunner introduces at least 4 
points of contacts, each of which can contribute to voltage drops.

Is this a K3S/100 or a K3S/10?  If it is a K3S/100 then the switchover 
from low power to the KPA3 occurs above 12 watts. Check that the circuit 
breaker on the back of the KPA3 is not in a tripped condition.

If all checks out OK and you still have problems, contact 
K3support at elecraft.com for some additional ideas.

73,
Don W3FPR

On 9/12/2016 8:41 PM, Tom Richardson wrote:
> I bought a new K3S two weeks ago, and I am trying to learn how to use
> it. I apologize if the answer to this issue is obvious, but it isn't
> obvious to me.
>
> I am trying to use the K3S in data mode (JT65 or AFSK). I have the
> DATA MD set to DATA A, MIC SEL to LInE In, MODE to DATA, and LINE
> input gain to 10. Everything seems to work until I try to increase the
> power output beyond 12 watts. At 13 watts and beyond, the power
> abruptly drops down to one or two watts.
>
>