[Elecraft] KX2/KXPA100 Drive Power

[stan levandowski]

Aaron, my SWR is being reported by the KX2 as below 1.2:1 at all times; 
usually 1:1. I'm using a window line fed doublet through an SGC-231 
autocoupler.  This situation occurs on all HF bands.  


I do not have either the KX2 internal ATU nor do I have the KXPA100 ATU. 
 Now you've got me wondering how accurate my KX2 SWR readout is -- I 
don't presently have an alternative way to check it.  My Elecraft W1 
crapped out awhile back.


The autocoupler has one million possible solutions so I've become 
accustomed to seeing 1:1 as the norm even when loading a rusty nail.  I 
think I better buy an independent SWR/PWR meter as a first step.


Someone else on this list privately emailed me and suggested I may not 
be getting a full 13.8 volts and the full current through my DC cable. 
 I'm using a switch mode supply - an SEC 1235M.


So I've got a couple things to check out now.  Thanks,


73, Stan WB2LQF

On Wed, Sep 20, 2017 at 12:50 PM, Aaron Marroquin wrote:

Hi Stan,


This sounds like the amp is folding back it's power. I encountered 
something similar on my KX3/KXPA100 when I had an issue with my antenna 
and was experiencing excessive SWR. Check the SWR indicators (both 
devices).

73,

Aaron KK6ZDB


On Tue, Sep 19, 2017, 20:12 stan levandowski <sjl219 at optonline.net 
<mailto:sjl219 at optonline.net> > wrote:
Since I'm basically a QRP op and rarely use more than 25 watts, I guess

I didn't notice when this "problem" actually began. So here's the issue:



My KX2 will show the power I've set with the knob precisely, right up to

110 watts.  However, my KXPA100's green LEDs seem to be about 20 watts

lower beginning at the 50 watt level.  For example, when I've set the

KX2 to 70 watts, the KX2 bar graph indeed reads 70 but the KXPA100 shows

the green 50 watt LED. At 100 watts the KX2 reads 100 but the KXPA100

reads 80 watts. At 25 watts, the KX2 and KXPA100 indications are in

agreement.





I don't know which piece of equipment to believe.





According to the KXPA100 manual (which ONLY refers to the KX3), it says

the drive levels have been set at the factory against a laboratory grade

KX3 and should not normally need to be messed around with.





So is the KX2 calibrated in equal fashion at the factory or do I need to

go through the CAL Pout routine for each band? 





Anybody else run into this situation?  





73, Stan WB2LQF

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