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From: Phil Seakins
Subject: Re: Should one worry about reflected current into untuned loads at low power?
Organization: Phil Seakins
X-Newsreader: Forte Agent 1.92/32.572
Date: Thu, 05 Dec 2002 03:53:27 +1000
NNTP-Posting-Date: Thu, 05 Dec 2002 04:53:34 EST
On Wed, 04 Dec 2002 08:08:06 +0000, Paul Burridge
>At what point in increasing power output from a PA does one need to
>worry about reflected power when squirting a RF signal down a
>radom-length wire? Is it possible to get away with say 6W out without
>damaging the output device?
How and why would you be sending RF down an audio line?
Increasing the output power of the PA would have little or no effect
on the power of the RF. Presumably the RF amplifier is decoupled and
would not shunt low frequencies.
Injecting RF into an audio amplifier output is dangerous because it is
going to snake it's way through the negative feedback circuitry.
Depending on the feedback decoupling the RF could get amplified
internally in the AF amplifier and frazz something.
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