Thank you Bill,
You made my day.
When K3s is driving my JUMA PA1000 without 100W PA, the drive is
better than excellent up to 8W.
I need 2W for 600W clean output (-40dB) in SSB.
For CW 4W is enough for a 1000W output (measured with LP100 power meter).
Juma use this active element, and here are some interesting measurements
for 144MHz:
http://www.nxp.com/products/rf/rf-power-transistors/rf-broadcast-and-ism/144-148-mhz-
1250-w-cw-50-v-2-meter-amateur-reference-design:RDMRFE6VP61K25H_2M_AMATEUR?fpsp=1&tab=Documentation_Tab
Benny OH9NB
==============================================
Message: 6
Date: Fri, 24 Feb 2017 16:24:11 -0700 (MST)
From: Bill Leonard N0CU<[email protected]>
To:[email protected]
Subject: Re: [Elecraft] High Tx IMD with new K3s/10
Message-ID:<[email protected]>
Content-Type: text/plain; charset=us-ascii
Benny,
I recently had Elecraft replace a KLPA3A again. They also did the Tx IMD mod
and an alignment.
I am now seeing the following 3rd order IMDs:
4W -40 dBc
8W -40 dBc
9W -35 dBc
10W -30 dBc
12W -20 dBc
What is also encouraging is that now the higher order IMDs (5, 7 & 9th) stay
at least 10 dB below the 3rd.
Some of these were equal or higher than the 3rd last summer when I was
discussing the problem with Elecraft. Obviously they have made some notable
improvements since then.
The two tone envelope still looks more like a square wave at 12W, but this
radio is spec'd as a 10W transmitter that is clean to -30 dBc, so it appears
they are now meeting their advertised spec.
Bill N0CU
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