naf.wv.mentorg.com, to <davide@gbr.mentorg.com>
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554 Too many hops 26 (25 max): from <europa@avnet.co.uk> via naf.wv.mentorg.com,
to <davide@gbr.mentorg.com>
----- Original message follows -----
From: europa@avnet.co.uk
Date: 2 May 1997 06:47:02 +0200
Subject: Returned mail:
Mail*Link(r) SMTP Returned mail: Too many hops 26
(25 max):
owner-europa using -f
Date: Fri, 2 May 1997 05:29:37 +0100 (BST)
From: MAILER-DAEMON@gbr.mentorg.com (Mail Delivery Subsystem)
Subject: Returned mail: Too many hops 26 (25 max): from
<europa@avnet.co.uk> via naf.wv.mentorg.com, to <davide@gbr.mentorg.com>
---From naf.wv.mentorg.com [147.34.22.13]
----- The following addresses have delivery notifications -----
<davide@gbr.mentorg.com> (unrecoverable error)
<nigelg@gbr.mentorg.com> (unrecoverable error)
----- Transcript of session follows -----
554 Too many hops 26 (25 max): from <europa@avnet.co.uk> via
naf.wv.mentorg.com, to <davide@gbr.mentorg.com>
----- Original message follows -----
From: europa@avnet.co.uk
(8.7.5/CF5.38H)
(8.6.8.1/CF5.26R)
Date: 2 May 1997 06:14:40 +0200
Subject: Re: Wire sizin
Mail*Link(r) SMTP Re: Wire sizing
owner-europa using -f
Date: 01 May 97 23:54:52 EDT
From: "Robert L. Nuckolls, III" <72770.552@compuserve.com>
Subject: Re: Wire sizing
> Now, here's a brain teaser for you. Why does the
> path length for 5% drop get longer as the wire diameter
> increases???? You guys who have read the book stand
> by here . . . let's see if anyone can deduce the reason
> from what's been published above. Hint: What is the
> mechanism by which a warm object sheds heat energy into
> the surrounding environment?
/Is it perhaps to do with the larger surface area
/of the wire shedding more heat into the air and
/therefore reducing the resistance of the wire.
/(as the wire doesn't get so hot).
Hmmmm . . . surface area is indeed a factor but
we're not talking about change of wire resistance.
Anyone else?
/Now here is a brain teaser for you Bob,
/How can it be, that I spent 60 uk pounds on a headset
/impedance matching unit, and all there is inside is
/a capacitor, a 9v battery and a resistor covered in black
/paint. Surely there must be some hi teq. invisible sound
/enhancing circuitry for all that cash?
Gee whiz, only 60 pounds? You probably got the best
deal in history on a black, 9-volt powered whatchafuzit.
The 6 volt ones are really cheap but you got a 9 volt
one for only 60? . . . Now, if you only had the phramistat
to go with it.
/No I'm joking, but seriously, is that all there is to it,
/because I feel that it would not have been beyond me to make
/it myself.
Which begs the issue as to whether or not you'd even want
to build it. I presume it's supposed to let you use audiophile
headphones in an airplane 600 ohm headset system? Depending
on the effeciency of the headsets, an ordinary, not amplifying
transformer may work well. Since audio system have many watts
available to drive headsets, the very best sounding ones tend
to NOT be very efficient. You might want to use some sort of
active device . . . like a National Semiconductor, integrated
circuit amplifier. This would indeed require a source of
power (but it's easy to tap it from the ships system) and you're
right . . . not hard to build. From what you described, I don't
think the gizmo you bought would do the job right. Can you
return it for a refund?
/I also wish to thank you for all the information to do with wiring
/this aeroplane, because it opens my eyes to possible pitfalls that
/I might have skipped over or gone to extremes to sort out, such
/as noise and shielded cables.
If you think the postings have been good, ya oughta get the book!
200 pages of the same sort of stuff. If you'll drop me your
address, I'll send you a schematic and bill of materials on
the headset amplifier I mentioned.
/Mind you I am still only doing the wings, so I have a fair time
/to go before the Engine.
It's NEVER too soon to think about wiring. When your all done
with everything else, have already bought a bunch of stuff and
drilled holes in the panel is NOT the time to start wondering
how to wire it all up. I know it's difficult . . . lots of folk
I meet at Oshkosh are years from flying but they dig through
the pile of goodies in the Fly-Market, snapping up bargins.
Later, they call me up and ask for help on putting all the
stuff they've already bought into the airplane. Not that it cannot
be done but it's a good example of bottom-up design . . . never
the best way to go about it. Save yourself time, money and lots
of frustration by knowing what you're going to do before you begin.
Bob . . .
Cheers //// Eddie Hatcher //// Kit 279 ///// //// South East
London Flying Group ///// //// bizzarroasynet.co.uk /////
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