80m inductor kit or a pair of 80m traps?
 

I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks

80m inductor kit or a pair of 80m traps?
 

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long for
the band in question, so that is probably not what you want. simple
inductors are used to make an antenna look longer so that is what you would
want... but expect it to affect tuning on all bands, not just add 80m
capability.

80m inductor kit or a pair of 80m traps?
 

In message rEsFj.101$sR1.28@trndny08, Dave writes

"Barrett" wrote in message
. uk...
I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long for
the band in question, so that is probably not what you want. simple
inductors are used to make an antenna look longer so that is what you would
want... but expect it to affect tuning on all bands, not just add 80m
capability.


Do a Google search on 'G5RV+extend'.
There seems to be a lot of information available.
--
Ian

80m inductor kit or a pair of 80m traps?
 

Dave, I have just put a Cowebb for 20 through to 10m. Its just 80 and 40 I'm
interested for the time being. Is it hard to make a pair of inductors and
how would I go about making a pair?

Thanks


"Dave" wrote in message
news:rEsFj.101$sR1.28@trndny08...

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long for
the band in question, so that is probably not what you want. simple
inductors are used to make an antenna look longer so that is what you
would want... but expect it to affect tuning on all bands, not just add
80m capability.

80m inductor kit or a pair of 80m traps?
 

"making" them is easy, just wind some wire around some kind of form, like a
piece of pvc pipe. figuring out how much wire, how many turns, and the
diameter is the hard part. I would use one of the antenna modeling programs
to figure that out given your current design and picking a point where you
think you can insert them. from that you could get a value of inductance
needed, then pick a likely form size and use one of the inductance
calculators on line to figure out how many turns of wire it would take.

"Barrett" wrote in message
...
Dave, I have just put a Cowebb for 20 through to 10m. Its just 80 and 40
I'm interested for the time being. Is it hard to make a pair of inductors
and how would I go about making a pair?

Thanks


"Dave" wrote in message
news:rEsFj.101$sR1.28@trndny08...

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long for
the band in question, so that is probably not what you want. simple
inductors are used to make an antenna look longer so that is what you
would want... but expect it to affect tuning on all bands, not just add
80m capability.

80m inductor kit or a pair of 80m traps?
 

"Is it hard to make a pair of inductors and how would I go about
making a pair?"

It's a coil. So, make a couple of coils of wire, typically on a form
of some kind cuz just wire tends to unravel if not held together some
way. That form ought to be non-conductive, PVC pipe for instance.
'Fatter' coils tend to be shorter than 'skinny' coils, and more
efficient sort of (to some ridiculous point), take up less room. How
long/diameter? Beats me. Make them what you think is too big and
then try shorting out turns of each coil till you get to where you
wanna go. That'll work for one band, probably not too well for two
bands, ain't gonna work for all bands at one time unless you make
those coils adjustable (coil taps).
Expect compromises. Won't be the 'best' in the world, but it'll work.
- 'Doc

80m inductor kit or a pair of 80m traps?
 

I will have a look for a antenna modelling program that I can get on with.
Also I'm using pvc covered flexweave wire for my G5RV. Is it all right to
make the inductors up from flexweave or should I get some enamelled copper
wire, or doesn't it really matters?

Thanks


"Dave" wrote in message
news:J1tFj.1921$7y3.986@trndny02...
"making" them is easy, just wind some wire around some kind of form, like
a piece of pvc pipe. figuring out how much wire, how many turns, and the
diameter is the hard part. I would use one of the antenna modeling
programs to figure that out given your current design and picking a point
where you think you can insert them. from that you could get a value of
inductance needed, then pick a likely form size and use one of the
inductance calculators on line to figure out how many turns of wire it
would take.

"Barrett" wrote in message
...
Dave, I have just put a Cowebb for 20 through to 10m. Its just 80 and 40
I'm interested for the time being. Is it hard to make a pair of inductors
and how would I go about making a pair?

Thanks


"Dave" wrote in message
news:rEsFj.101$sR1.28@trndny08...

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long
for the band in question, so that is probably not what you want. simple
inductors are used to make an antenna look longer so that is what you
would want... but expect it to affect tuning on all bands, not just add
80m capability.

80m inductor kit or a pair of 80m traps?
 

whatever you can wind with. solid copper will stay in place better by
itself being a bit springy, flexweave you would probably have to glue down
to the form to keep it from sliding around.

"Barrett" wrote in message
...
I will have a look for a antenna modelling program that I can get on with.
Also I'm using pvc covered flexweave wire for my G5RV. Is it all right to
make the inductors up from flexweave or should I get some enamelled copper
wire, or doesn't it really matters?

Thanks


"Dave" wrote in message
news:J1tFj.1921$7y3.986@trndny02...
"making" them is easy, just wind some wire around some kind of form, like
a piece of pvc pipe. figuring out how much wire, how many turns, and the
diameter is the hard part. I would use one of the antenna modeling
programs to figure that out given your current design and picking a point
where you think you can insert them. from that you could get a value of
inductance needed, then pick a likely form size and use one of the
inductance calculators on line to figure out how many turns of wire it
would take.

"Barrett" wrote in message
...
Dave, I have just put a Cowebb for 20 through to 10m. Its just 80 and 40
I'm interested for the time being. Is it hard to make a pair of
inductors and how would I go about making a pair?

Thanks


"Dave" wrote in message
news:rEsFj.101$sR1.28@trndny08...

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks


well, 'traps' are usually used to cut off an antenna that is too long
for the band in question, so that is probably not what you want.
simple inductors are used to make an antenna look longer so that is
what you would want... but expect it to affect tuning on all bands, not
just add 80m capability.

80m inductor kit or a pair of 80m traps?
 

I will have a look for a antenna modelling program that I can get on
with. Also I'm using pvc covered flexweave wire for my G5RV. Is it all
right to make the inductors up from flexweave or should I get some
enamelled copper wire, or doesn't it really matters?


If you would like to build air inductors very similar to B&W AirDux
coils, I highly suggest you go to: http://www.qsl.net/n1lo/antenna.htm
and download the instructional PDF found at the bottom of that page titled
"80-10M mobile vertical." It includes excellent instructions and parts
locations to do this.


Ed K7AAT

80m inductor kit or a pair of 80m traps?
 

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks

If you add inductors to a G5RV, it will no longer be a G5RV. You might be
better off with an 80 - 10 m trap dipole. It will be shortert than an 80
meter dipole.

Tam/WB2TT

80m inductor kit or a pair of 80m traps?
 

"Barrett" wrote in
k:

I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks



Reading through the responses, it seems that your requirement is actually
for a shortened wire antenna for 80 and 40.

The starting materials are a half sized G5RV (which is not a G5RV, but
one of the many variants).

You could salvage materials from the G5RV to make a trapped 80/40 dipole.

(The traps do not simply work as an on/off switch to disconnect the end
sections as implied by some. They might be seen to work that way if they
were resonant at the operating frequency, but they need not be, and there
is good reason for them to not be resonant at any operating frequency.)

Google around for designs for an 80/40 trapped dipole, there are plenty.
Decent articles will include details of the physical construction of the
traps.

There is a design on my web site, but it is probably too long for you (we
don't know your length requirements other than less than a G5RV, you
chose to not share that). Nevertheless, it might be an interesting read,
see http://www.vk1od.net/coaxtrap/8040.htm .

These type of antennas are affected by their environment, so you should
expect to need to fine tune the configuration. Be wary of varying
specific trap designs, you might dig a hole for yourself.

Owen

80m inductor kit or a pair of 80m traps?
 

I found a good site on how to make some air spaced coaxial traps for each
band but that's all I could find.

Can traps be made up with enamelled copper wire as I have just ordered a
real of 20 swg?

I've found some good information on inductors but is there any good sites on
making traps with copper wire?

Thanks



"Tam" wrote in message
...

"Barrett" wrote in message
k...
I have up a half size G5RV and want to add 80 metres it. I don't have the
space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks

If you add inductors to a G5RV, it will no longer be a G5RV. You might be
better off with an 80 - 10 m trap dipole. It will be shortert than an 80
meter dipole.

Tam/WB2TT

80m inductor kit or a pair of 80m traps?
 

Sorry about that, I should of said the length of my garden.
From the bottom of the garden up to the wall of the house it is 60 feet and
I do not have any chimney stacks to run wires from. My neighbours are happy
with a 20 foot pole at the bottom of the garden. Any higher and there not
happy about it so that's it for the height. At least there ok with a 20'
pole. I am limited on length of wire and unfortunately the height as well.
So any help is welcome.


"Owen Duffy" wrote in message
...
"Barrett" wrote in
k:

I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks



Reading through the responses, it seems that your requirement is actually
for a shortened wire antenna for 80 and 40.

The starting materials are a half sized G5RV (which is not a G5RV, but
one of the many variants).

You could salvage materials from the G5RV to make a trapped 80/40 dipole.

(The traps do not simply work as an on/off switch to disconnect the end
sections as implied by some. They might be seen to work that way if they
were resonant at the operating frequency, but they need not be, and there
is good reason for them to not be resonant at any operating frequency.)

Google around for designs for an 80/40 trapped dipole, there are plenty.
Decent articles will include details of the physical construction of the
traps.

There is a design on my web site, but it is probably too long for you (we
don't know your length requirements other than less than a G5RV, you
chose to not share that). Nevertheless, it might be an interesting read,
see http://www.vk1od.net/coaxtrap/8040.htm .

These type of antennas are affected by their environment, so you should
expect to need to fine tune the configuration. Be wary of varying
specific trap designs, you might dig a hole for yourself.

Owen

80m inductor kit or a pair of 80m traps?
 

When I put the homebrew HF traps in my wire Ariel how do I calculate the
length of wire before and after each trap for each band?

Thanks


"Barrett" wrote in message
.. .
Sorry about that, I should of said the length of my garden.
From the bottom of the garden up to the wall of the house it is 60 feet
and I do not have any chimney stacks to run wires from. My neighbours are
happy with a 20 foot pole at the bottom of the garden. Any higher and
there not happy about it so that's it for the height. At least there ok
with a 20' pole. I am limited on length of wire and unfortunately the
height as well. So any help is welcome.


"Owen Duffy" wrote in message
...
"Barrett" wrote in
k:

I have up a half size G5RV and want to add 80 metres it. I don't have
the space for a full size.

What is best to go for a 80m inductor kit or a pair of 80m traps?

Thanks



Reading through the responses, it seems that your requirement is actually
for a shortened wire antenna for 80 and 40.

The starting materials are a half sized G5RV (which is not a G5RV, but
one of the many variants).

You could salvage materials from the G5RV to make a trapped 80/40 dipole.

(The traps do not simply work as an on/off switch to disconnect the end
sections as implied by some. They might be seen to work that way if they
were resonant at the operating frequency, but they need not be, and there
is good reason for them to not be resonant at any operating frequency.)

Google around for designs for an 80/40 trapped dipole, there are plenty.
Decent articles will include details of the physical construction of the
traps.

There is a design on my web site, but it is probably too long for you (we
don't know your length requirements other than less than a G5RV, you
chose to not share that). Nevertheless, it might be an interesting read,
see http://www.vk1od.net/coaxtrap/8040.htm .

These type of antennas are affected by their environment, so you should
expect to need to fine tune the configuration. Be wary of varying
specific trap designs, you might dig a hole for yourself.

Owen

80m inductor kit or a pair of 80m traps?
 

On Wed, 16 Apr 2008 14:39:27 +0100, "Barrett"
wrote:

When I put the homebrew HF traps in my wire Ariel how do I calculate the
length of wire before and after each trap for each band?

Hi Barrett,

1. You either copy an existing design and follow their specifications
for this explicitly;

2. You model the design and plan to trim length, and/or adjust turns;

3. You throw something together and (again) plan to trim length,
and/or adjust turns.

The placement of the coil along the radiator by actual distance and
proportion, seriously changes its requirements for any application.
That is to say, a 50 turn coil, with turns every 3mm, and a 4cm
diameter will work for one frequency at one position for one length of
wire ONLY. And even height above ground may upset this too; but
perhaps not as much as the first set of variables.

73's
Richard Clark, KB7QHC