Re: Stupid RF newbie has a question...
From: Dave (db5151_at_hotmail.com)
Date: 10/14/04
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Date: Thu, 14 Oct 2004 04:51:17 -0500
"Terry Pinnell" <terrypinDELETE@THESEdial.pipex.com> wrote in message
news:po8sm05qrhftomgbqentngjb8gbrp9vufv@4ax.com...
> "Dave" <db5151@hotmail.com> wrote:
>
> >I am wanting to build a simple RF amplifier to boost the signal to my
> >television, and then use the knowledge I gained in that project to build
a
> >second RF amplifier to boost and filter the signals I receive on my
> >Shortwave radio (which I connect to a random-wire antenna up on the
roof.)
> >I have a background in electronics (with the exceptions listed earlier)
and
> >would like to keep on learning in this new direction. I do have a simple
> >workshop set up (again, after 20 years) and am basically seeking to pick
up
> >the hobby again.
> >
> >I realize I started out by making a fool of myself, but really am serious
> >and would appreciate any help anyone could offer.
> >
> >Thanks,
> >
> >Dave
>
> Tim and I already answered your specific question about '||'. That
> means 'in parallel', and I gave some examples.
>
> As for '&', now that I see the document, it plainly means simply
> 'and'! The formula was presumably badly typeset, and should have had a
> blank space on both sides of the '&'.
>
> But isn't that obvious from the context? I don't think you're being
> careful enough in your reading. In your reply to Paul Burridge you
> said: "There is no Rb in the circuit illustration, and R1 is *not*
> parrallel with R2."
>
> Directly above the formula in question, the author says:
> "The Thevnin equivalent of VCC, R1 and R2 in circuit # 3 is Vin and Rb
> in circuit # 2." If you scroll back up to Circuit 2, which you
> presumably read earlier, you'll see Rb.
>
> Note that some care is needed when using symbols like 'RB'; in his
> Circuit 2 the 'B' is actually a little smaller than the 'R', but it's
> not well-positioned. I'd have written 'Rb'. That's particularly
> sensible when you have no subscript symbols available, as is the case
> in these newsgroup threads.
>
> As for R1 || R2, Thevenin is about *equivalences*. Presumably you've
> read up on his Theorem? (One of hundreds of relevant links is:
> http://hyperphysics.phy-astr.gsu.edu/hbase/electric/thevenin.html )
>
> So, the 'R1||R2' part of the formula is meant to be read as 'the value
> of R1 and R2 in parallel.
>
> The author has also consistently mis-spelt 'Thevenin'.
>
> --
> Terry Pinnell
> Hobbyist, West Sussex, UK
>
Yeah, okay, I see it now. Damn I've gotten dense. Sorry to be such a
bother and so hard to convince. I haven't even touched any of this in over
20 years, and that has apparently affected my ability to reason and actually
think. Can't tell you all how much I appreciate your patience. And your
persistance. I've got a lot of catching up to do. Thank you.
Dave
db5151@hotmail.com
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