[Elecraft] KX3 KXPA100

[Matt VK2RQ]

First check the supply voltage to the amp -- if you're not giving it at least 13,8V you may find it winds back the max output power.

73, Matt VK2RQ

> On 5 Mar 2014, at 4:36 am, "Cady, Fred" <fcady at ece.montana.edu> wrote:
> 
> Hi,
> There is a power calibration that you can do.  This is from the KX3 firmware notes for KX3 firmware 1.76.  Maybe you can try that.
> 
> MCU 1.76 / DSP 1.27, 11-20-2013
> 
> * MENU:PA MODE NOW HAS POWER-OUT CAL (P out CAL) SETTING:  This enables 75-W power calibration in TUNE mode. When PWR is adjusted, and "P out CAL" mode is in effect, setting power to 75 watts shows "CAL 75W" on VFO B.
> 
> * KXPA100 DRIVE POWER CAL DATA UTILIZED: If the KXPA100's per-band 75-W drive power has been saved at the factory, the KX3 will use it.  If not, the KX3's own per-band amplifier drive data is used (if available). This data is created by setting PA MODE to Pout CAL (see above), then doing a TUNE on each band at 75 W.
> 
> 
> Cheers,
> Fred KE7X
> 
> "The Elecraft K3: Design, Configuration and Operation 2nd ed"
> "The Elecraft KX3 - Going for the summit"
> www.ke7x.com or www.lulu.com 
> KPA500 and KAT500 Quick Set Up Guide
> http://www.ke7x.com/home/k-line-introduction-and-set-up-guide 
> (Coming soon: "The Elecraft KPA500 and KAT500 - the K-Line Dream Station")
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of G7KXZ
> Sent: Tuesday, March 04, 2014 10:14 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KX3 KXPA100
> 
> Hi All,
> 
> I have had my KX3 for some time, just completed a kit KXPA100 with Tuner.
> 
> Testing all works well, ATU tunes very well. Audio reports on TX good.
> 
> My issue is with the Power out LED's and the Utility program monitoring the power. I do not have an accurate Power Meter Output appears as indicated not to exceed 70W
> 
> The LEDs follow the Utility program (makes sense) Can an adjustments be made? 
> I am off to EA8 land on Monday......... and would like to run 100w and not 12w !!!
> 
> Att On
> SWR 1:1
> KX3 Dial= 25W
> Utility Input= 0.4
> Utility Forward= 7
> Dissipated= 52
> Relected= 0.0
> 
> SWR 1:1
> KX3 Dial= 50W
> Utility Input= 1.2
> Utility Forward= 20
> Dissipated= 74
> Relected= 0.1
> 
> SWR 1:1
> KX3 Dial= 75W
> Utility Input= 2.1
> Utility Forward= 36.5
> Dissipated= 87
> Relected= 0.3
> 
> SWR 1:1
> KX3 Dial= 100W
> Utility Input= 4
> Utility Forward= 64
> Dissipated= 96
> Relected= 0.4
> 
> SWR 1:1
> KX3 Dial= 110W
> Utility Input= 5
> Utility Forward= 75
> Dissipated= 96.5
> Relected= 0.4
> 
> 
> 
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