[Elecraft] K2 2390 Lives! But got a question or two....

[Ron D' Eau Claire]

Rick wrote:

>All seems to work well "BUT" I got a
> question or two.  While measuring power output and tweaking for maximum
> output I used a Daiwa CN-101L SWR & Power meter and the internal power
> meter. I also used a 50 watts MFJ versaload dummy load (Like the cantenna
> dummy load) I have the following statistics with full power output on each
> band:
>
> Frequency 	Daiwa CN-101L	Internal Power meter
> 3.750 	10 watts		12.1 watts
> 7.100		11 watts		13.2 watts
> 10.100	10 watts		12.1 watts
> 14.100	11 watts		12.5 watts
> 18.100	11 watts		12.1 watts
> 21.100 	11 watts		12.6 watts
> 24.900	10.5 watts		13.2 watts
> 28.200 	9 watts		12.3 watts
>
> I was hoping for the full 15 watts... I
> note that some of the bands hit 2.50 amps which sets off the high current.
> Usually I get high current flashing but not consistently.

The K2 is rated for only 10 watts output. The 15 watts is available on SOME
bands if you have a full 13.8 volts on the supply line. That's the margin
Elecraft designed in to be sure every K2 meets the spec of at least 10 watts
out.

So you seem to be a bit low on 28.2, but most power meters are doing well to
be accurate within 20%, so your readings are not surprising. Ten meters us
usually the band with the lowest power output.

You WILL get a "high current" with the limit set to 2.5 amps. If you want to
open 'er up all the way on all bands, a typical K2 may draw more than 3 amps
on some bands.

Ron AC7AC
K2 # 1289