[Elecraft] KX3 Amp

[Edward R Cole]

Guys,

I run my KX3 as IF on 2m FM running either 3w for 25w or 5w for 50w 
out of the 2m amplifier.  I have not noticed the KX3 getting overly 
hot, even though FM is key down continuous carrier.

But I would be careful at full power.  I can run 270w with 12w input 
on 20m.  With 5w input I get 130w (note the values in the table on 
the website are overrated due to a measurement error - the K3 outputs 
12w and not 15w).  This using my CCI model EB27A amplifier rated for 
300w with 20w drive.
http://www.kl7uw.com/HF-300PA.htm

I have found most amps will provide usable though lower output if 
underdriven.  The KXPA100 may be capable of something like 60w with 
5w drive?  Gain often is a bit higher as lower levels of drive.

73, Ed - KL7UW
---------------------
Date: Sun, 24 Mar 2013 19:11:33 +1000
From: Gary Gregory <vk1zzgary at gmail.com>
To: Fred Smith <mfsj at mo-net.com>
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX3 Amp

Not sure 11W drive is good for normal rag chewing with the KX3. It does get
rather hot to touch.

I would hope that the KXPA100 would only require 5W for 100W output or
close to that.

73