Very odd old aerial

Brian Gaff wrote:
Sounds to me like the old saying is stood on its head here. Some words are
worth a thousand pictures.

Brian

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

On Mon, 16 Jul 2012 11:25:30 -0700 (PDT), Graham
wrote:



Brian Gaff wrote:
Sounds to me like the old saying is stood on its head here. Some words are
worth a thousand pictures.

Brian

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

That is how I see it as well.

--
Peter Duncanson
(in uk.tech.digital-tv)

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

That is how I see it as well.

--
Peter Duncanson
(in uk.tech.digital-tv)

Is anyone thinking what I am thinking?

Let's see,. The volunteer riggers smash the first one
And the dealer comes back with a "new" one
Know one in the area knows what a television aerial
Looks like?

Could this be the original Rouges Gallery exhibit?

In message , Peter Duncanson
writes
On Mon, 16 Jul 2012 11:25:30 -0700 (PDT), Graham
wrote:



Brian Gaff wrote:
Sounds to me like the old saying is stood on its head here. Some words are
worth a thousand pictures.

Brian

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

That is how I see it as well.

Could it be that the driven element(s) are basically sort-of sleeve
dipoles, where the coax enters at one end? However, I must say that it
doesn't look like the driven element(s) have any join at (or near) the
centre, where the coax would be connected. There are loads of Google
hits, but the best simple diagram I can find at the moment is at
http://www.antentop.org/003/files/tr003.pdf
Page 10, Fig (a).
--
Ian

In message , Ian Jackson
writes
In message , Peter
Duncanson writes
On Mon, 16 Jul 2012 11:25:30 -0700 (PDT), Graham
wrote:



Brian Gaff wrote:
Sounds to me like the old saying is stood on its head here. Some words are
worth a thousand pictures.

Brian

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

That is how I see it as well.

Could it be that the driven element(s) are basically sort-of sleeve
dipoles, where the coax enters at one end? However, I must say that it
doesn't look like the driven element(s) have any join at (or near) the
centre, where the coax would be connected. There are loads of Google
hits, but the best simple diagram I can find at the moment is at
http://www.antentop.org/003/files/tr003.pdf
Page 10, Fig (a).

That's page 10 of the PDF - the page numbered 14.
--
Ian

On Mon, 16 Jul 2012 22:09:32 +0100, Ian Jackson
wrote:

In message , Peter Duncanson
writes
On Mon, 16 Jul 2012 11:25:30 -0700 (PDT), Graham
wrote:



Brian Gaff wrote:
Sounds to me like the old saying is stood on its head here. Some words are
worth a thousand pictures.

Brian

A 4x4 phased array, VP so side by side.

There doesn't seem to be a connection block in the centre
of. any of the 8 elements, all, including the driven element are
continuous rods.

A wire or cable enters. or is connected to each of the lower limbs
of the driven elements

These wires or cables droop and then meet at the
mast, looking like a phasing harness.

If this wire is co-ax, I have no idea how the inner and
outer are deployed.

Does my interpretation of this not too clear picture
concur with anyone else's?

That is how I see it as well.

Could it be that the driven element(s) are basically sort-of sleeve
dipoles, where the coax enters at one end? However, I must say that it
doesn't look like the driven element(s) have any join at (or near) the
centre, where the coax would be connected.

I agree that there's no join visible.

If they are sleeve dipoles it might be that the two conducting elements
are tubes joined mechanically by an insulating rod with a hole along its
axis for the core of the coax, and that the coax is fitted at the
factory.


There are loads of Google
hits, but the best simple diagram I can find at the moment is at
http://www.antentop.org/003/files/tr003.pdf
Page 10, Fig (a).

--
Peter Duncanson
(in uk.tech.digital-tv)

"Y Dangle" wrote in message
...
"Graham." wrote in message
...

Can someone explain the feed arrangement on this old BI 4X4

I remember seeing a lot of those round here as single 4-element aerials
with the whole thing supported by the mast going to the base of the dipole
rather than the boom so I'm guessing a co-ax went up the lower leg of the
dipole to the centre? Or would that do something weird to the matching?

Rod

On Mon, 16 Jul 2012 14:08:02 -0700 (PDT), Graham
wrote:

Is anyone thinking what I am thinking?

I'm thinking I don't know what you're thinking minister.

Ian Jackson wrote:

Could it be that the driven element(s) are basically sort-of sleeve
dipoles, where the coax enters at one end? However, I must say that it
doesn't look like the driven element(s) have any join at (or near) the
centre, where the coax would be connected. There are loads of Google
hits, but the best simple diagram I can find at the moment is at
http://www.antentop.org/003/files/tr003.pdf
Page 10, Fig (a).

That's page 10 of the PDF - the page numbered 14.

The 0.05wavelength figure quoted near the bottom of printed page 6 is
exceeded by most practical UHF designs.

Bill

Hamster wrote:
"Y Dangle" wrote in message
...
"Graham." wrote in message
...
Can someone explain the feed arrangement on this old BI 4X4

I remember seeing a lot of those round here as single 4-element aerials
with the whole thing supported by the mast going to the base of the dipole
rather than the boom so I'm guessing a co-ax went up the lower leg of the
dipole to the centre? Or would that do something weird to the matching?

You mean this sort of thing?:
https://dl.dropbox.com/u/11023364/BI...lector%201.jpg
https://dl.dropbox.com/u/11023364/BI...lector%202.jpg

Also, while I'm at it:
https://dl.dropbox.com/u/11023364/Da...e%2 0here.jpg
https://dl.dropbox.com/u/11023364/sq...s%20notice.jpg

Bill