From: Paul Burridge
Subject: Re: Should one worry about reflected current into untuned loads at low power?
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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Date: Mon, 09 Dec 2002 11:42:59 +0000
NNTP-Posting-Date: Mon, 09 Dec 2002 13:11:21 GMT
Organization: Virgin Net Usenet Service
On Sun, 08 Dec 2002 16:15:56 GMT, firstname.lastname@example.org (carltons) opined
>My question is: "Why do you want to put up with a mismatch if you know you
>have one?". Get a lower power pa and a decent load instead of more power
>and a lousy load. Is there an application which would have a lousy return
>loss and needs the pa to overcome the transmission loss? You can always
>use a circulator to accomplish this also, providing the frequency band is
Yes, I can certainly understand your query. A bit of background...
I'm going to be using this tx in a very "signal-hostile" environment.
It's a huge aircraft hanger chock full of stray RF and other
interference from TV cameras, microwave links, PMR radios, walkie-
talkies, lighting transformers - you name it. I need to up the ERP of
our control signal to overcome these - we've been swamped out by them
on two previous occasions and enough is enough. However, I don't want
us to appear to be using anything other than bog-standard r/c
equipment in case any other competitor uses us as a scapegoat for not
being able to get a signal through themselves. Hence a 40MHz dipole
(for example) though desirable, is totally out of the question.
Nothing we're doing here is against any rule or law, we just simply
need to overcome all the background 'noise' more effectively without
*appearing* to have an unfair advantage.
"I was going to help him up, but then I thumped him."
Michael Head's plea in mitigation to Weybridge Magistrates, Sept. 1975