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Re: [AMPS] a question for the EXPERT

To: <amps@contesting.com>
Subject: Re: [AMPS] a question for the EXPERT
From: i4jmy@iol.it (i4jmy@iol.it)
Date: Tue, 4 Dec 2001 11:23:18 +0100

> 
> in VHF Amplifier 
> which is the best way to make the output:
> 1) Variable capacitor between Anode and antenna
> 2)Link with variable capacitor near the end of the line
> 
> is there a difference in efficiency???
> i think that the link mode , is the clearest and attenuate armonicas ,
> but i do not am sure if it efficient same the the capacitor directly o
n
> plate.
> hello i5uxj
> 

The most common output configuration for tube amplifiers, at least in 
the FM broadcast applications, is a tuned cavity with a shunt variable 
line (tune) and a series capacitor (load). 
This is quite efficient, relatively easy to be built and allows a big 
range for tuning. The back side of the horse is the requirement of a 
consistent low pass filter, a filter that's anyway a must when the 
harmonic and spurious content has to be really 70/80 dBc down.

73,
Mauri I4JMY



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