Reflection Coefficient Challenge Solved
 

Richard Clark wrote:
"The point of the challenge was to illuminate the invalidity of claims
that the usual Ham transmitter does NOT exhibit 50 Ohms and that any
power returning to it from a mismatched load is reflected fully back
toward the load."

The impedance a transmitter presents to a reflection is seldom
advertised as far as I know. I think it could be measured.

If a matchbox exists between the transmitter and the line, it may be
adjusted to get the most out of the transmitter. If so, this match
should prevent a reflection from reaching the transmitter. If the
reflection doesn`t reach the transmitter, there is no place else for the
reflection to go other than for another go at the load, given low losses
in the matching and feeding systems.

Best regards, Richard Harrison, KB5WZI

On Wed, 10 Sep 2003 21:08:33 +0000 (UTC), Reg Edwards hath writ:
I've been stating John Cleese's 'bleeding obvious' for years but nobody
seems to take a scrap of notice.

All the power which leaves the transmitter MUST be dissipated in the load -
there's nowhere else for it to go.

Well, of course -- when you realise that *EVERYTHING* past the
output tank on the xmitter _is_ the load for the xmitter.
The first coax connector (if any), the xmission line(s), the
tuner (if in-line), any add'l coax connectors, the matching lash-up
at the antenna (if any), and finally -- taaaa-Daaa -- The Antenna.

And now, can you believe it, Morse Code is on its way out !

And, so, too, are microphones and speakers!!
A good percentage of the amateurs I meet now-a-days do not
own a microphone -- nor a speaker. Many hams have never
actually _spoken_ to another ham except at a swapfest (rally)
or a club meeting. sigh............

I have given up honking a "HI" at another call letter plate.
Now-a-days what I usually get in return is a 1-finger salute.

73
jonesy
--
| Marvin L Jones | jonz | W3DHJ | OS/2
| Gunnison, Colorado | @ | Jonesy | linux __
| 7,703' -- 2,345m | config.com | DM68mn SK

Reg:

[snip]
And now, can you believe it, Morse Code is on its way out !
[snip]

What!

Say it isn't so...

--
Peter K1PO
dah di dah

Marvin Jones, W3DHU wrote:
"Now-a-days what I usually get in return (to hi beeped on the claxon) is
a 1-finger salute."

I`ve been lamenting not buying a bumper sticker seen in San Francisco
last week: "SIGNALS OUT - WATCH FOR FINGER!"

Best regards, Richard Harrison, KB5WZI

In article t,
says...


Reg:

[snip]
And now, can you believe it, Morse Code is on its way out !
[snip]

What!

Say it isn't so...

It isn't so. (Sorry, I just HAD to do that!)

In any case, it's Morse Code testing that's on its
way out. I suspect Morse Code usage will continue
for many years to come.

72/73,
Bob

--
+---------------------------------------------------+
| Bob Schreibmaier K3PH | E-mail: |
| Kresgeville, PA 18333 | http://home.ptd.net/~k3ph |
+---------------------------------------------------+

"Reg Edwards" wrote in message ...
I've been stating John Cleese's 'bleeding obvious' for years but nobody
seems to take a scrap of notice.

All the power which leaves the transmitter MUST be dissipated in the load -
there's nowhere else for it to go.

(Apart, of course, from the insignificant fraction of an S-unit, even on
Roy's meter, which gets lost in the line).

If anybody should mention re-re-re-reflections or power waves, I shall
'squeam' and 'squeam' and 'squeam' as did "Just William" 's 5-year-old
pretty little golden-haired girl friend who lived next door.

For the younger generation of US citizens who may not have heard of 12-year
old William, he was the middle-class, naughty but well-intentioned,
10-year-old leading character in Richmal Crompton's series of "Just William"
books.

When the cry went out...Willliaaam all went quiet
hoping that the accumulator in the radio would not give up.

Heinkels and Messersmidts, V1's and V2's in the azure blue skies over the
sunny green fields and pretty, finished, English villages, where William and
friend Ginger enjoyed their schooldays, finally put paid to the English
class system of farm-labourers living in tied thatched cottages and the
English Country-gentlemen farmers.

Used to count the doodle bugs that came from the N.E. at the same time
I countyed the flares emitted from returning fortresses.
Land army girls were to old for me.
Who on earth picks the malt hops now, that used to serve as a vacation
in the country for me?

Kids now have to be content with porn and football all day on the telly and
on most pages of the daily papers while becoming obese gorging Mac's
many-layered hamburgers while standing up.

And now, can you believe it, Morse Code is on its way out !

Could that mean that the audio will now take over those
quiet frequencies when the last O.T.leaves?


Art