wrote in message
ups.com...

You've probably heard the old engineering adage:

"You can have it fast, good or cheap. Choose any two"

All Shannon's Theorem does is equate fast to data rate, good to S/N,
and cheap to bandwidth.


BINGO! That's exactly the problem. What is Jim going to give up to get it?

Dee D. Flint, N8UZE

Mike Coslo wrote:
Dave Heil wrote:

Mike Coslo wrote:

wrote:

Tsk. Coslonautics, ink, is still challenged to reach the "threshold
of space" as announced last year...going where other ham radio
balloons have gone before. It is now nearly mid-summer and no
flight, no tests, no words.




Glad you asked! "Things" are moving along well enough, much of
the equipment has been chosen, yet needs to be integrated. Flight 1
will be tethered to shake down the payload, flight two will be a
short, relatively low altitude flight. At flight 3, the payload form
factor will be changed. Beyond that, the flights will build on the
success or problems encountered during previous flights.

That's all the words you get.

There will be web pages devoted to the project. At that time you
can read and ridicule, but you'll have to go to the website to get
yer material.



Why dontcha ask Len how that "Extra right out of the box" is coming
along. How many years down the road has that been now?


No point to it.

Not sure why he is so anxious for us to launch something. I don't
recall setting any particular deadline.

No biggie.

Surely you know that Len is the very opposite of being anxious for you
to launch. If you had a sucessful launch, it'd take away his ammunition.

Dave K8MN

Dee Flint wrote:
wrote in message
ups.com...

You've probably heard the old engineering adage:

"You can have it fast, good or cheap. Choose any two"

All Shannon's Theorem does is equate fast to data rate, good to S/N,
and cheap to bandwidth.



BINGO! That's exactly the problem. What is Jim going to give up to get it?

And my, have we come a long way from simply hooking up a modem To our
rig haven't we?

Lessee, Split operation, perhaps 2 modems? Lotsa power, very high
quality transmitter and PA, as well as a great soundcard. A marked
sensitivity to phase distortion. At HF, it would be a very expensive
system that would work on a good day maybe.

And it is a superior thing?

Makes BPL look like a masterpiece!

- Mike KB3EIA -

From: on Wed 6 Jul 2005 15:54

wrote:
From: on Tues 5 Jul 2005 16:41
John Smith wrote:
N2EY:

First, you can run duplex, simply use two modems and a separate
transmitter and receiver.

Uh-huh. Got it. The reciever listens while the transmitter transmits.
On the same frequency. 'Way to go "John", slap a patent on it!

Did John say "on the same frequency?" I don't think so.

He didn't say *not* on the same frequency either Sweetums. Now what?

Two questions:

1. What ELSE did John "*not* say?"

2. What are you going to say he "really said?" :-)

This is all very clever of you, but it really boils down to
YOU saying a lot of snit (that another didn't say) and then
trying to tap-dance around admitting you fudged things up.

Next time just accept being caught and hang up.

Do NOT try to MAKE UP STORIES to try and snow-job everybody.
It doesn't work and it annoys the other pigs.


FULL duplex IS possible using SEPARATE frequencies for
transmit and receive.

No kidding Sweetums I've done it several times myself. With my own
equipment operated under my own operators and station license.

Mostly I think you "did it" with only your own computer and
more literary license than you ever earned. :-)

But, that's just my opinion...and with some considerable
thinking about HF operations that hardly EVER go FULL duplex,
senior. For one thing, the rather large near field at HF
wavelengths mean you NEED considerable separation of antennas
or the most bodaciously-many-section-dual-filter to keep the
unwanted frequencies (transmitter leaking into receiver) OUT.
That attenuation has to be VERY large in order to keep the
receiver input from overloading.

Now, WHY would you want to go FULL duplex "operating under any
license?" for personal use? You would need someone at the other
end of the circuit doing the same thing...and that is an almost-
extreme rarity.

Telephone Cell sites operate 24/7 at FULL duplex. They HAVE to
and the equipment is designed to do that...such as separate
transmitting and receiving bands with plenty of diplexing filter
connecting the transmitter(s) and receiver(s).

The General Electric microwave terminals I've described used a
(approximately) 5-foot long dual waveguide bandpass filter to
keep separate transmit and receive frequencies from interfering
with one another. The pulse-position-modulation pulse trains
were not synchronous with one another, thus aiding in isolation.
The peak power output of the transmitter was only 12 Watts (at
base of antenna tower) yet the receiver was about as sensitive
as one could get (using radar receiver techniques) of the 1950s.

If you are going to mumble about "your own moonbounce" (what is
mistakenly called "EME" by hams), then you need not worry about
mutual interference. A return signal won't return from the moon
for about 2.5 seconds, long enough for you to manually swtich
coax or waveguide between transmit and receive (as one of the
early ham moonbouncers did and pictured in CQ long ago).

Or, you could go into broadband BS about using morse and auto-
switchover Tx/Rx by fancy diode T/R switching...so much so that
you could "read the other station between dots and dashes" like
your buddie Jimmie once said in here. :-)

But in your case of course . . sigh

In "my case" you are resentful/insulted/irritated because another
had LONG AGO experience in something YOU DID NOT. shrug I've
come to expect that in here from the self-propelled wunderkinder
of the PCTA extra crowd. It's practically a given. :-)

Dave Heil wrote:

Mike Coslo wrote:

No point to it.

Not sure why he is so anxious for us to launch something. I don't
recall setting any particular deadline.

No biggie.


Surely you know that Len is the very opposite of being anxious for you
to launch. If you had a sucessful launch, it'd take away his ammunition.


I doubt that, Dave. 8^)

- Mike KB3EIA -