[Elecraft] KXPA100 with PX3

[rsoifer1 at aol.com]

Yes, the power light is on.  When I'm in Basic mode (PA MODE OFF), the KXPA100 draws 12 amps key down at 13 VDC.  The power output is 100 watts.  With PA MODE ON, there is no output and the current drawn is 8 amps at 13 VDC.  The power is dissipated through the heat sink.


Hope this helps.


73 Ray W2RS

Does the power light on the KXPA100 turn on when you power on the KX3?





-----Original Message-----
From: Don Wilhelm <donwilh at embarqmail.com>
To: rsoifer1 <rsoifer1 at aol.com>; dave <dave at ad6a.com>
Cc: fcady <fcady at montana.edu>; ai6do <ai6do at yahoo.com>; elecraft <elecraft at mailman.qth.net>
Sent: Fri, Dec 30, 2016 1:49 pm
Subject: Re: [Elecraft] KXPA100 with PX3

Ray,

Does the power light on the KXPA100 turn on when you power on the KX3?

I am not sure about your statements about "all the power it produces is 
being dissipated"
Dissipated where?  Into power output or into heat?  Does the heatsink 
heat up?

Similarly, your statement about "no power dissipated" when in basic mode.

Can you connect an external wattmeter and a dummy load, put the KXAT100 
into bypass and see what the KXPA100 is really producing. That more 
detailed information will aid in answering your question.  If you can 
measure the current draw and voltage during keydown that would help even 
more.

73,
Don W3FPR

On 12/30/2016 3:16 PM, rsoifer1 at aol.com wrote:
> Further to my last email, when I am in Basic mode, with PA MODE set to 
> OFF and the KXPA100 on/off switch set to ON, I get full power out and 
> no dissipation.  When PA MODE is ON and the on/off switch set to OFF, 
> the KX3 acts like the KXPA100 is connected to it but there is no power 
> output from the KXPA100 but all the power it produces is being 
> dissipated.  Some setting is probably wrong, but I can't figure out 
> which one.
>
>