[Elecraft] KX3 - Holding Power Output at Set Value\

[Walter Underwood]

Looks like the wall wart cannot provide the 2.5 A needed for transmit. The drop to 10 V automatically triggers dropping to 5 W.

If you want a small supply, the KX-33 can provide 4 A at 14 V.

https://proaudioeng.com/products/pae-kx33-low-rfi-ac-power-supply/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Dec 7, 2021, at 1:16 PM, David Hourdequin <drh at dremy.com> wrote:
> 
> I am in the process of getting familiar with my newly acquired KX3 purchased for POTA and am enjoying it immensely.
> 
> I am powering it with a 14.8V, high quality, Yamaha walwart - very little internal noise. Settings indicated in the  VFO B display area using DISP are normal.
> 
> When I set the PWR level to 10 watts and then key the xmtr, the power immediately drops to 5 watts.  With the key down, I am monitoring the VFO B display which indicates a drop from 14.8V to 10+V and 1+A.  That makes it 10W.  If so, why does the reading when I push in PWR drop to 5W?  Is that ‘input’ power vs ‘output’ power, ie, 50% efficiency?  
> 
> If that is true, how does one achieve and maintain 10W of output power?
> 
> Any help would be most appreciated. Feel free to RSVP here or call if you like - or send me your number and I’ll call you!
> 
> Tnx es 73, David, NS4V
> 
> David R. Hourdequin, PE
> 828-421-6216
> drh at dremy.com
> 
> 
> 
> 
> 
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