[Elecraft] KX1 Output

[Don Wilhelm]

Steve,

The output power of a KX1 will vary from band to band.  That fact is 
because of design compromises made to fit a 4 band LPF into a tiny space 
as well as normal gain vs. frequency variations in the amplifying 
devices itself.  There is also a great dependency on the care used 
during construction, particularly with the 4 band LPF.

I have not checked a KX1 at 11.1 volts, but with a 13.8 volt supply, the 
power output levels I typically expect are:
80m - 4+ watts
40m - 3.8+ watts
30m - at least 4 watts
20m - 3.3+ watts

Since the power output will vary approximately by the ratio of the 
squares of the supply voltage, you could expect the output with an 11.1 
volt supply to be about 65% of the levels above.  In other words a 2 to 
2.5 watt range can be expected.

Note that these powers are measured using a precision 50 ohm 
non-reactive dummy load with the developed RF Voltage observed with an 
oscilloscope and 10X probe connected across the dummy load.  The power 
available to an antenna will depend on the feed impedance of the antenna.

73,
Don W3FPR

list1 wrote:
> Hi All,
> What is the typical power output of the KX1 with an 11.1 Volt 3 cell Lithium
> battery pack (assuming its at 11.1 Volts) on 80, 40, 30, and 20 meters?
> 
> Thanks,
> Steve, W2MY
> 
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