[Elecraft] KX3 beta firmware rev. 2.38: 15 Watts max output on 80-20 m, and PSK63 mode

[Don Lewis (KI4D)]

Howard - I am getting 14.4VDC from the supply on receive.  I have not tried
transmit.  I am just concerned why the updated firmware won't allow display
of 15 watts.  Thanks for your response to my question.  Perhaps I need to
upload the beta firmware again although the utility says I have the current
version.

Don, KI4D  

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Howard
Hoyt
Sent: Monday, February 8, 2016 11:38 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX3 beta firmware rev. 2.38: 15 Watts max output on
80-20 m, and PSK63 mode

Hi Don,

Running the new software revision on our development units here (s/n
1403 & 7420), we see 15W output on 80-20M, with the KX3 pulling 2.2-2.5A
depending on SWR.  The voltage readings below are the average observed on
two different KX3s on 40M powered by a Pro Audio Engineering Kx33:

Voltage at the DC jack measured on an HP34401A:
Rcv: 14.45 VDC
Xmit: 14.15 VDC

Voltage from the KX3 display PS value:
Rcv: 14.1 VDC
Xmit: 13.5 VDC

The lower readings on the KX3's display are due to the polarity protection
diode and other I*R voltage drops /internal/ to the KX3.  
Elecraft's spec for the 15W power level specifies a supply which can deliver
/at the DC power jack/ at least 13.8V at the 2.3-2.5A level needed for 15W
output.  The PAE-Kx33 design will deliver at the DC power plug 3A at >14.0V,
and 4A at >13.9V.

If your Kx33 supply  is not delivering better than 13.8V at the plug running
15W then please contact us!

Cheers & 73,

Howie - WA4PSC
www.proaudioeng.com
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