It is so amazing how a simple post of nonsense will make all the
gullible members of this group dance like puppets on a string.


Rick

got him in one ...

"rickman" wrote in message ...

On 11/4/2014 12:48 PM, gareth wrote:
If short antennae radiate all the power that is fed to them, then why
would
anyone use long antennae, because the first part of such an antenna, the
short
part, would radiate all the power, and then there'd be nothing left for
the
extra bit, making up the rest of the long antenna, to do?

The answer is, of course, because it is more difficult to feed a short
antenna
because of its reactance.

So, whence does this reactance arise?

Simple.

It is the power that has NOT been all radiated by the short antenna
arriving
back at
the feed point with an awkward phase relationship with the incident power.

What happens to that power that has not ALL been radiated when it arrives
back
at the feed point?

Simple.

It passes back into the matching network, which, together with the short
bit, form
the resonant artefact, where much of it disappears as heat in the matching
network
before being fed back to the short antenna to start all over again.

Now, Stephen Thomas Cole, that well-respected font of all technical
knowledge over
in uk.radio.amateur is saying that all you Yanks are a bunch of dopes if
you
do not understand
the above, so take it up with him over there.

# It is so amazing how a simple post of nonsense will make all the
# gullible members of this group dance like puppets on a string.

I've gone QRV on this particular thread.

On 11/4/2014 7:55 PM, Wayne wrote:


"rickman" wrote in message ...

On 11/4/2014 12:48 PM, gareth wrote:
If short antennae radiate all the power that is fed to them, then why
would
anyone use long antennae, because the first part of such an antenna, the
short
part, would radiate all the power, and then there'd be nothing left
for the
extra bit, making up the rest of the long antenna, to do?

The answer is, of course, because it is more difficult to feed a short
antenna
because of its reactance.

So, whence does this reactance arise?

Simple.

It is the power that has NOT been all radiated by the short antenna
arriving
back at
the feed point with an awkward phase relationship with the incident
power.

What happens to that power that has not ALL been radiated when it arrives
back
at the feed point?

Simple.

It passes back into the matching network, which, together with the short
bit, form
the resonant artefact, where much of it disappears as heat in the
matching
network
before being fed back to the short antenna to start all over again.

Now, Stephen Thomas Cole, that well-respected font of all technical
knowledge over
in uk.radio.amateur is saying that all you Yanks are a bunch of dopes
if you
do not understand
the above, so take it up with him over there.

# It is so amazing how a simple post of nonsense will make all the
# gullible members of this group dance like puppets on a string.

I've gone QRV on this particular thread.

"Ready to copy"?

Or do you mean QRT?

--
==================
Remove the "x" from my email address
Jerry, AI0K

==================

"Jerry Stuckle" wrote in message ...

On 11/4/2014 7:55 PM, Wayne wrote:


"rickman" wrote in message ...

On 11/4/2014 12:48 PM, gareth wrote:
If short antennae radiate all the power that is fed to them, then why
would
anyone use long antennae, because the first part of such an antenna, the
short
part, would radiate all the power, and then there'd be nothing left
for the
extra bit, making up the rest of the long antenna, to do?

The answer is, of course, because it is more difficult to feed a short
antenna
because of its reactance.

So, whence does this reactance arise?

Simple.

It is the power that has NOT been all radiated by the short antenna
arriving
back at
the feed point with an awkward phase relationship with the incident
power.

What happens to that power that has not ALL been radiated when it arrives
back
at the feed point?

Simple.

It passes back into the matching network, which, together with the short
bit, form
the resonant artefact, where much of it disappears as heat in the
matching
network
before being fed back to the short antenna to start all over again.

Now, Stephen Thomas Cole, that well-respected font of all technical
knowledge over
in uk.radio.amateur is saying that all you Yanks are a bunch of dopes
if you
do not understand
the above, so take it up with him over there.

# It is so amazing how a simple post of nonsense will make all the
# gullible members of this group dance like puppets on a string.

I've gone QRV on this particular thread.

# "Ready to copy"?

# Or do you mean QRT?

Sitting here "ready to copy" on an interesting subject, and in the fuller
meaning of QRV, sitting here in the shack sending a string of v's on the bug
to show I'm ready.

"Wayne" wrote in message
...

I've gone QRV on this particular thread.

"There's none so blind as he who will not see"

On 04/11/2014 17:48, gareth wrote:

Simple.

You should find any of these easy then:

http://www.redlinegroup.com/job/rf-a...ampaign=Indeed

http://www.technojobs.co.uk/job.phtm...ampaign=indeed

http://cobham.taleo.net/careersectio...0&src=JB-10240

http://jobview.monster.co.uk/RF-ANTE...feed_indeed_UK

http://www.new-employment.eu/detail....7d03de7b40d615

http://www.jobsite.co.uk/job/das-des...387&tmp l=dis

gareth wrote:

If short antennae radiate all the power that is fed to them, then why
would anyone use long antennae,

Because there may be factors other than power efficiecny that are important
to the designer. For example, radiation pattern.


because the first part of such an antenna,
the short
part, would radiate all the power, and then there'd be nothing left for
the extra bit, making up the rest of the long antenna, to do?


Unfortunately, only you belive that is the case. Your position conflicts
with what is understood about antennas.

The answer is, of course, because it is more difficult to feed a short
antenna
because of its reactance.


That may be one reason for using a longer antenna. It is not the only
reason, nor may it be the primary reason.

So, whence does this reactance arise?

Simple.

It is the power that has NOT been all radiated by the short antenna
arriving back at
the feed point with an awkward phase relationship with the incident power.

What happens to that power that has not ALL been radiated when it arrives
back
at the feed point?

Simple.

It passes back into the matching network, which, together with the short
bit, form
the resonant artefact, where much of it disappears as heat in the matching
network
before being fed back to the short antenna to start all over again.

If it is so simple, where are the equations and models that describe it?