[Amps] Pre-Distortion Linearizer

[Keith Morehouse]

THIS (below) is why many insightful hams have PA's capable of "illegal
power output".  They run them backed off 3 or 4 dB and have nice clean
signals while those around them with the latest "1.5KW" unit, being driven
to the gills, IM the band to death.

But, just let one of those clean-at-low-drive PA's come up for sale and
watch the sniveling masses sully the reputation of the owner as a "cheater"
and make snide comments about how those amplifiers "have no place on the
bands".

Hmmm. . . you've seen it done on this reflector. . . .

W9RM

Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Montrose, CO


On Fri, May 3, 2013 at 9:39 PM, <amps-request at contesting.com> wrote:

>
>
> Message: 9
> Date: Sat, 4 May 2013 12:09:00 +0930
> From: "Leigh Turner" <invertech at frontierisp.net.au>
> To: <amps at contesting.com>
> Subject: Re: [Amps] Pre-Distortion Linearizer
> Message-ID: <20130504023210.854C6230340 at mail.aitel.com.au>
> Content-Type: text/plain;       charset="us-ascii"
>
>
> <snip>
>
> For the average ham it's far easier to run an amplifier conservatively to
> steer well clear of the amplifier's compression transfer curve where the
> gain and Po depart from a linear relationship with input power, i.e.
> practice power and drive back-off to attain maximum linearity.
>
> The majority of common ham-radio amplifier tubes respond nicely to this
> simple approach and yield sufficiently adequate IMD characteristics when
> deployed in a well designed amp.
>
> <snip>
>
> Leigh
> VK5KLT
>