[Elecraft] KPA1500 Linearity

[K9MA]

The gain compression I measured, between 1000 and 1500 W on 40 meters, was 1.4 dB. I used the K3 and KPA1500 power meters.  Factory calibration of the KPA1500. 

Scott K9MA 

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Scott Ellington

 --- via iPad

> On Jun 14, 2018, at 2:51 PM, Paul Baldock <paul at paulbaldock.com> wrote:
> 
> What you report of compression near the maximum power is certainly true of the amplifiers like the SPE-1.5K that use a single device, but I would have thought this would not be true of the KPA1500 that uses 2 devices. This is the reason I returned my SPE and ordered the KPA. Hopefully the compression is less than 1dB.
> 
> Has anybody else measured it?
> 
> - Paul  - KW7Y
> 
> 
> 
> At 02:21 PM 6/9/2018, you wrote:
>> I recently ran a two-tone test and measured CW power gain. (SN1078)  It doesn't look good.  The two-tone waveform shows distinct "flat-topping", and the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z amplifier is much better.  Has anyone measured IMD or linearity, or seen any test results? While I'm primarily a CW operator, I'd be very reluctant to use the amplifier on SSB. 73, Scott K9MA -- Scott  K9MA k9ma at sdellington.us ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to paul at paulbaldock.com
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