[Amps] PA efficiency

[Jim Thomson]

Date: Thu, 19 May 2011 12:35:34 +0200
From: "DF3KV" <df3kv at t-online.de>
Subject: Re: [Amps] PA efficiency
To: <amps at contesting.com>
Message-ID: <FEA683BECF23454DAAA59CE16E1C6ABB at shack>
Content-Type: text/plain; charset="us-ascii"

You might have a hard time to reach even 60% efficiency from a VHF/UHF amp 

73
Peter

##  point well taken.  I was ref to a hf amp, low bands.   You get the point though. 
One should be able to by careful measurement, be able to calculate eff  within
a few percent.... not within  20%. 

##  I have a friend in W7 land who built a hb 6m 8877 amp... and eff 
was lousy.  He rebuilt that tank circuit twice again...and a buch of other mods...
and managed to get it up by a few percent....but it was still lousy.  Turns out
his bird slug was out to lunch, not even close.   With a known, accurate
slug... indicated po  went from 1500w  up to  2200 w.  

Jim 




-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Jim Thomson

If I built an amp that I thought had 68% eff.... then found out it was
really only 48%... I'd go nuts.  Not good enough. 

later.. Jim  VE7RF