[Elecraft] KX3 2m external amplifier

[Jim Brown]

That would be great, Mel.

I think I probably have about 8 brick amps of this generation carrying 
the Mirage and RF Concepts nameplate. Up to now, I've never looked at 
their spectral performance, and I don't have an easy way to do so with 
the frequency resolution of the P3, because I have only one 2M CW 
transceiver. OTOH, I could probably borrow a second one from W6GJB.

The most practical test I currently know of for IM performance is 
transmitting CW dits in the range of 35WPM and looking at the occupied 
bandwidth on a P3 with a display bandwidth on the order of 10 kHz.

73, Jim

On Fri,7/29/2016 12:57 PM, Mel Farrer wrote:
> If anyone needs information on the older KLM/Mirage amplifiers, I have 
> some of the original documentation when I was at KLM/Mirage in the 
> '70/'80 time period. Would be glad to share.
>
> Mel, K6KBE
> One of the founders of KLM Electronics
>
>
> ------------------------------------------------------------------------
> *From:* Jim Brown <jim at audiosystemsgroup.com>
> *To:* elecraft at mailman.qth.net
> *Sent:* Friday, July 29, 2016 12:15 PM
> *Subject:* Re: [Elecraft] KX3 2m external amplifier
>
> On Fri,7/29/2016 10:31 AM, Ron D'Eau Claire wrote:
> > Are those capable of linear operation for SSB as the poster asked? 
> The ones
> > I had back then were non-linear (class C) strictly for FM/CW only.
>
> CW is 100% modulation of a carrier by a rectangular wave, so the
> harmonics associated with rise and fall times create at least as much
> distortion as SSB. That distortion shows up in the form of clicky
> sidebands. It's quite easy to see these sidebands on a P3. Here's some
> work I did a year or two ago measuring some rigs that were available 
> to me.
>
> http://k9yc.com/P3_Spectrum_Measurements.pdf
>
> The second file contains much of the same data, but focuses on
> improvements made by firmware upgrades to the FTDX5000 a year or two ago.
>
> http://k9yc.com/FTDX5000_Report.pdf
>
>
> 73, Jim K9YC
>
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