"V" Dipole Antenna
 

There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. Can someone help me with resources
or information on installation and effects of a "V" Dipole? In my
current location I am unable to raise my center point much more than
15 feet off ground. However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. Thank you for your insights!

73
WB8YKH

"V" Dipole Antenna
 

WB8YKH wrote:
There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. Can someone help me with resources
or information on installation and effects of a "V" Dipole? In my
current location I am unable to raise my center point much more than
15 feet off ground. However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. Thank you for your insights!

Most dipoles are of the V type, having that weight in the middle and
all. Your dipole will work okay, go for it.

What is the reason for the center being half as high as the ends? There
will be some droop always, unless you place too much tension on the
wires - don't do it. It looks nice and all, but that antenna's probably
going to come down before too long.


Technically, there will be some differences between it and a straight
dipole. Just not that huge, and hey, that is what your situation allows!
If you give me your lengths and frequencies you are using, I can model
it for you.


- 73 de Mike N3LI -

"V" Dipole Antenna
 

It will have a pattern very similar to a horizontal dipole at a height
equal to the height of your antenna 1/3 of the way out from the center.
If the center is at 15 feet and ends are at 30 feet, it'll have nearly
the same pattern as a horizontal dipole at 20 feet.

Impedance-wise, it'll act nearly the same as an inverted vee.

Roy Lewallen, W7EL

WB8YKH wrote:
There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. Can someone help me with resources
or information on installation and effects of a "V" Dipole? In my
current location I am unable to raise my center point much more than
15 feet off ground. However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. Thank you for your insights!

73
WB8YKH

"V" Dipole Antenna
 

Impedance-wise, it'll act nearly the same as an inverted vee.


Yeah but, there wil be a 20 dB loss due to 180 degree inversion of
polarity!

denny / k8do

"V" Dipole Antenna
 

On Mar 20, 4:47*pm, Michael Coslo wrote:
WB8YKH wrote:
There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. *Can someone help me with resources
or information on installation and effects of a "V" Dipole? *In my
current location I am unable to raise my center point much more than
15 feet off ground. *However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. *Thank you for your insights!

Most dipoles are of the V type, having that weight in the middle and
all. Your dipole will work okay, go for it.

* * * * What is the reason for the center being half as high as the ends? There
will be some droop always, unless you place too much tension on the
wires - don't do it. It looks nice and all, but that antenna's probably
going to come down before too long.

Technically, there will be some differences between it and a straight
dipole. Just not that huge, and hey, that is what your situation allows!
If you give me your lengths and frequencies you are using, I can model
it for you.

* * * * - 73 de Mike N3LI -

The reason for the center being half as high as the ends is that I
have trees on both ends but nothing in the center for support other
than one old short dead tree. Thank you for the insights and
encouragement. I'll begin the attempt to install once the weather
cooperates here in Michigan. WB8YKH

"V" Dipole Antenna
 

WB8YKH wrote:
On Mar 20, 4:47 pm, Michael Coslo wrote:
WB8YKH wrote:
There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. Can someone help me with resources
or information on installation and effects of a "V" Dipole? In my
current location I am unable to raise my center point much more than
15 feet off ground. However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. Thank you for your insights!
Most dipoles are of the V type, having that weight in the middle and
all. Your dipole will work okay, go for it.

What is the reason for the center being half as high as the ends? There
will be some droop always, unless you place too much tension on the
wires - don't do it. It looks nice and all, but that antenna's probably
going to come down before too long.

Technically, there will be some differences between it and a straight
dipole. Just not that huge, and hey, that is what your situation allows!
If you give me your lengths and frequencies you are using, I can model
it for you.

- 73 de Mike N3LI -

The reason for the center being half as high as the ends is that I
have trees on both ends but nothing in the center for support other
than one old short dead tree. Thank you for the insights and
encouragement. I'll begin the attempt to install once the weather
cooperates here in Michigan. WB8YKH

You should be able to get it a little higher in the middle. Enough
tension on the ends and you could have maybe 10 feet of droop instead of 20.

Another option I've seen used is to use a messenger rope that runs the
entire length of the antenna. With a sturdy rope, you can relieve the
tension on the antenna wires by having the tension on the rope

- 73 de Mike N3LI -

"V" Dipole Antenna
 

On Mar 21, 10:12*am, Christopher Cox
wrote:
The reason for the center being half as high as the ends is that I
have trees on both ends but nothing in the center for support other
than one old short dead tree. *Thank you for the insights and
encouragement. *I'll begin the attempt to install once the weather
cooperates here in Michigan. *WB8YKH

Just an idea, how about a end fed zep?

Gain should be the same without the mechanical problem of trying to feed
* the antenna in the center.

Chris

Your idea to use an end fed zep sounds interesting however I am
attempting to raise a double bazooka coaxial dipole I purchased at the
Dayton Hamvention two years ago. WB8YKH

"V" Dipole Antenna
 

On Mar 21, 10:33*am, Michael Coslo wrote:
WB8YKH wrote:
On Mar 20, 4:47 pm, Michael Coslo wrote:
WB8YKH wrote:
There is much literature on the inverted "V" antenna but I've found
nothing on a "V" Dipole Antenna. *Can someone help me with resources
or information on installation and effects of a "V" Dipole? *In my
current location I am unable to raise my center point much more than
15 feet off ground. *However I can raise the endpoints 30+ feet.
Before I go through much effort on the install I'd like to know what
kind of performance I can expect. *Thank you for your insights!
Most dipoles are of the V type, having that weight in the middle and
all. Your dipole will work okay, go for it.

* * * * What is the reason for the center being half as high as the ends? There
will be some droop always, unless you place too much tension on the
wires - don't do it. It looks nice and all, but that antenna's probably
going to come down before too long.

Technically, there will be some differences between it and a straight
dipole. Just not that huge, and hey, that is what your situation allows!
If you give me your lengths and frequencies you are using, I can model
it for you.

* * * * - 73 de Mike N3LI -

The reason for the center being half as high as the ends is that I
have trees on both ends but nothing in the center for support other
than one old short dead tree. *Thank you for the insights and
encouragement. *I'll begin the attempt to install once the weather
cooperates here in Michigan. *WB8YKH

You should be able to get it a little higher in the middle. Enough
tension on the ends and you could have maybe 10 feet of droop instead of 20.

"V" Dipole Antenna
 

I'd never heard of a messenger rope. Sounds interesting. How is the
messenger rope secured to the antenna line? WB8YKH

More properly "messenger line".

This seems to be a difficult item to search so I will attempt to an
explanation...

When two ships meet at sea and wish to transfer items from one ship to
another (think mail, movies, etc.) they must keep a safe distance
between them. The accepted procedure is to throw or otherwise launch a
small rope or line from one to the other. Then a larger line is
attached to the small line and pulled back to the originating ship.
There may be several iterations of this until a line strong enough to
carry the ultimate load is in place. The first line (and may be the
interim lines) that were used to get the final line in place are
refferred to as messenger lines.

I sometimes use a weighted piece of fishing line as the meesenger and
tie the string/rope/wire in place to hang an antenna. It saves a lot
of snagging if you streamline the attaching knot with a bit of tape.

If anyone manages to figure out a search that provides useful results
for "messenger line" I would appreciate the enlightenment!

John Ferrell W8CCW
Beware of the dopeler effect (pronounced dope-ler).
That's where bad ideas seem good if they come at you
fast enough.

"V" Dipole Antenna
 

"John Ferrell" wrote in message
...


I'd never heard of a messenger rope. Sounds interesting. How is the
messenger rope secured to the antenna line? WB8YKH

More properly "messenger line".

This seems to be a difficult item to search so I will attempt to an
explanation...

When two ships meet at sea and wish to transfer items from one ship to
another (think mail, movies, etc.) they must keep a safe distance
between them. The accepted procedure is to throw or otherwise launch a
small rope or line from one to the other. Then a larger line is
attached to the small line and pulled back to the originating ship.
There may be several iterations of this until a line strong enough to
carry the ultimate load is in place. The first line (and may be the
interim lines) that were used to get the final line in place are
refferred to as messenger lines.

I sometimes use a weighted piece of fishing line as the meesenger and
tie the string/rope/wire in place to hang an antenna. It saves a lot
of snagging if you streamline the attaching knot with a bit of tape.

If anyone manages to figure out a search that provides useful results
for "messenger line" I would appreciate the enlightenment!

John Ferrell W8CCW

John while what you describe is correct, it is not the type of messanger
rope, line, or cable that is being thought of.

In the antenna case, it is a strong rope that is streached between two
supports. To this rope is attached a lighter antenna. Say you only have
some number 20 wire and want to make an 80 meter dipole. If you string the
# 20 wire and attach some rg-8 type coax to the middle of it, it would
probalby not stay up very long. Also you would have to have a large drop in
the middle as you can not streachit very tight without breaking.
If you have a strong rope you can tape and use some ultraviolet resistant
wire ties to attach the antenna wire to the rope and then pull it up
tighter.

I have a tower up 60 feet with several beams on it. While it may not be the
recommended practice, I came off the tower around the 40 foot level and ran
the coax (4 coax +rotor cable) to the house about 50 feet away. I used a
piece of guy wire and taped and ty wrapped the cable to the the guy wire. I
pulled this guy wire tight enough to keep the cable off the ground. This
particular guy wire is not one of the supporting guys, but just a 'messanger
wire' to hold up the coax with out strssing the coax.