http://elecraft.85.s1.nabble.com/KPA-500-Output-for-Input-schedule-tp6352735p6353888.html
>
> Adding gain calculation ...
>
>
> > 2W = 30W 11.8 dB
> > 2.5W = 40W 12.0 dB
> > 3w = 50w 12.2 dB
> > 3.5w = 60w 12.3 dB
> > 4w = 70w 12.4 dB
> > 4.5w = 75w 12.2 dB
> > 5w = 80w 12.0 dB
> > 5.5w = 90w 12.1 dB
> > 6w = 100w 12.2 dB
> > 6.5w = 110w 12.3 dB
> > 7w = 120w 12.3 dB
> > 7.5w = 130w 12.4 dB
> > 8w = 150w 12.7 dB
> > 8.5w = 160w 12.7 dB
> > 9w = 170w 12.8 dB
> > 9.5w = 180w 12.8 dB
> > 10w = 190w 12.8 dB
> > 11w = 200w 12.6 dB
> > 12w = 225w 12.7 dB
>
> The numbers look about right including the decreased gain at low level
> (as expected). Using 12.6/12.7 dB would indicate 33W drive for 600W
> out. 40W drive for 600W output would indicate ~1 dB of compression.
>
> 73,
>
> ... Joe, W4TV
>
> On 5/11/2011 5:28 PM, Gary Gregory wrote:
> > Stan,
> >
> > Allow some variation to antenna variations also.
> >
> > This on 15M, swr is 1.0:1
> >
> > 2W = 30W out
> > 2.5W = 40W
> > 3w = 50w
> > 3.5w = 60w
> > 4w = 70w
> > 4.5w = 75w out
> > 5w = 80w
> > 5.5w = 90w
> > 6w = 100w
> > 6.5w = 110w
> > 7w = 120w
> > 7.5w = 130w
> > 8w = 150w
> > 8.5w = 160w
> > 9w = 170w
> > 9.5w = 180w
> > 10w = 190w
> > 11w = 200w
> > 12w = 225w
> >
> > NOTE to ALL: This was not done with lab equipment or even a dummy load.
> This
> > was measured using a K3 and a tri-band yagi and a cw tone.
> >
> > Gary
> >
> > On 12 May 2011 07:13, Al Lorona<
[hidden email]> wrote:
> >
> >> It's very easy to measure the 1-tone gain compression characteristics of
> an
> >> amplifier. The desired result is a graph of Pout vs. Pin, with Pin on
> the
> >> horizontal axis and Pout on the vertical.
> >>
> >> So what one needs to do is set Pin to the amp, and measure Pout into a
> >> dummy
> >> load. If you do this for several values of Pin, you'll be able to plot
> all
> >> of
> >> those measured points on the graph. It will look like a pretty straight
> >> line
> >> toward the lower Pin values, then it will flatten out (become more
> >> horizontal)
> >> as Pin (and Pout) get higher.
> >>
> >> The slope of the line is the gain of the amplifier.
> >>
> >> Very often the Pin values are 1 dB apart. One dB is about a 25% increase
> in
> >> power. Meaning that if you are measuring Pin in Watts, then you can set
> Pin
> >> to
> >> roughly the following values:
> >>
> >> 1, 1.5, 2, 3, 4, 5, 7, 10, 13 Watts, etc.,
> >>
> >> and measure the Pout at each value. The values should be converted to
> dBm
> >> before
> >> plotting. That's all there is to it.
> >>
> >> This is all done in CW mode. If you want to go further, you can go into
> SSB
> >> mode
> >> and apply two tones to the amp (which a K3 has the ability to do) and
> then
> >> look
> >> at the output of both the K3 and the KPA500 with a spectrum analyzer...
> but
> >> I'll
> >> leave that explanation for another day... or it can be found on the web.
> >>
> >> Al W6LX
> >> ______________________________________________________________
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> >
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