Of Course you are, all horror stories aside.

Don't confuse the angels dancing on the pinheads around here with practical
world experiences. The best solution is to increase the length of your
dipole to 130 feet and feed it with 100 foot of 450 Ohm ladderline. Connect
a piece of coax with a ferrite bead choke to the 450 Ohm line. Your tuner
will love you and you can use all bands from 80 on up.

The electrical plug on your rig has losses that are about as meaningful real
world..

"Buck" wrote in message
...
On Sun, 05 Jun 2005 19:21:27 -0500, Cecil Moore
wrote:

Chuck Olson wrote:
The tuner doesn't reduce efficiency - -

There's no such thing as a 100% efficient tuner.


I realize that a tuner is not 100% efficient, but when I hook up my 80
meter dipole and listen on 20 meters (the wire is fed with coax), the
signals are stronger when tuned thru the tuner rather than direct from
the antenna. Not to mention that when I transmit, the radio is
operating on reduced power with the dipole direct. I realize that
there is considerable loss in my coax (I am using garbage and know it)
and that I am taking a loss thru the tuner, but it is a better option
than direct thru the coax alone.




--
73 for now
Buck
N4PGW

On Tue, 7 Jun 2005 14:55:25 -0400, "Fred W4JLE"
wrote:

Of Course you are, all horror stories aside.

Don't confuse the angels dancing on the pinheads around here with practical
world experiences. The best solution is to increase the length of your
dipole to 130 feet and feed it with 100 foot of 450 Ohm ladderline. Connect
a piece of coax with a ferrite bead choke to the 450 Ohm line. Your tuner
will love you and you can use all bands from 80 on up.

The electrical plug on your rig has losses that are about as meaningful real
world..


Thanks for the encouragement and antenna.

I have two dipoles up right now. One is a 20 meter mono-bander that
was setup specifically for 20 meters and to test a test design for a
PVC 'cobra head' (whatever the generic name).

The other is a piece made of junk that I put up using parts I already
had available. (#14 electrical wire, PVC insulators and TV Coax). It
started as a 20 meter dipole, I added 40 and then 80 meters. It
wasn't supposed to be anything but a temporary antenna until I made a
new one, but weather, timing and money won't cooperate with me. I
have patched and patched it. Ice tore down one leg this winter and
destroyed half the PVC insulators I was using for spacers. Yesterday I
rewired the PL-259, cut the connection to the wires and re-wired it
and cut off the 40 and 20 meter elements. It tunes and hears much
better now.


I have always wanted antennas that would cover all bands without a
tuner. This was practical as a novice when all I could work was 80,
40, 15, and 10 meters. Three parallel dipoles hanging from one
antenna feed worked well. When I advanced to General, I used two
parallel dipoles and an antenna switch. (CW: 80, 40-15, 20, &10; and
SSB: 75, 40, & 10).

Today, my idea isn't as practical as it was. I now have a rig that
covers 160-6 meters on one HF connector. That's eleven bands!!
That's a lot of parallel dipoles on a feed even with the bands split
up into two antennas.

I acquired an antenna tuner recently and it tunes very quickly. I
still don't like it, but I can operate anywhere from 160-6 meters on
it (not that I have heard anyone on 6 yet.)

I would like to build a portable antenna using 300 ohm TV- twin lead
for the feed for the tuner. Is there a recommended length and feed
point for all bands?

Thanks

Buck
N4PGW

--
73 for now
Buck
N4PGW

I can send you a copy of a program I wrote. It is based on Cecil's work. You
can put in the length of the dipole you want to use, the frequency, and type
of feed line. It gives you the choice of giving you the length of feedline
for that single case, or a start and stop frequency in which case it prints
out a chart of frequency vs. total length.Add jumpers to make up the
difference above 80 feet and your good to go!

For portable operation a 130 foot dipole fed with 80 feet of 300 Ohm to a
small piece of Plexiglas and two sets of banana jacks would allow you to
put jumpers of various lengths into the jacks. The second set goes to the
rig via a convenient length of 50 ohm coax with a choke balun of ferrites.
Lengths of 1,2,4, and 8 foot would allow you to make up jumpers to enable 75
meters from 3.8 to 4 and all the other bands with the exception of 60
meters.

It can be made smaller if your only interested in 40 and up etc. Easy to
carry, no tuner and worst swr around 1.7:1

For example a 2 foot jumper would put you at 4.0, and a series of an 8,2,
and 1 jumper for 3.8

"Buck" wrote in message
...

I would like to build a portable antenna using 300 ohm TV- twin lead
for the feed for the tuner. Is there a recommended length and feed
point for all bands?

Thanks

Buck
N4PGW

--
73 for now
Buck
N4PGW

Thank you,

Is this the same program he http://www.qsl.net/w5dxp/notuner.htm ?

I have been looking at this awhile and wonder if the SWR on 17 and 10
meters can be better tuned by adding an additional 1/2 foot section.

It probably doesn't matter at that SWR.


another question related to the antenna:

Do you think this would work? Instead of switching the lead in and
out, could the leads be tapped at each band according to the matched
setting? So that instead of a series of knife switches, a double-pole
multi-throw switch could be used to select a band or frequency for
use?

Thanks again, gears are turning in my head again...


73 for now
Buck





On Wed, 8 Jun 2005 11:40:10 -0400, "Fred W4JLE"
wrote:

I can send you a copy of a program I wrote. It is based on Cecil's work. You
can put in the length of the dipole you want to use, the frequency, and type
of feed line. It gives you the choice of giving you the length of feedline
for that single case, or a start and stop frequency in which case it prints
out a chart of frequency vs. total length.Add jumpers to make up the
difference above 80 feet and your good to go!

For portable operation a 130 foot dipole fed with 80 feet of 300 Ohm to a
small piece of Plexiglas and two sets of banana jacks would allow you to
put jumpers of various lengths into the jacks. The second set goes to the
rig via a convenient length of 50 ohm coax with a choke balun of ferrites.
Lengths of 1,2,4, and 8 foot would allow you to make up jumpers to enable 75
meters from 3.8 to 4 and all the other bands with the exception of 60
meters.

It can be made smaller if your only interested in 40 and up etc. Easy to
carry, no tuner and worst swr around 1.7:1

For example a 2 foot jumper would put you at 4.0, and a series of an 8,2,
and 1 jumper for 3.8

--
73 for now
Buck
N4PGW

Buck wrote:
Do you think this would work? Instead of switching the lead in and
out, could the leads be tapped at each band according to the matched
setting? So that instead of a series of knife switches, a double-pole
multi-throw switch could be used to select a band or frequency for
use?

Nope, that won't work because it leaves unterminated stubs
in the transmission line system. You might be able to
predict their effect but I have never tried to do that.
It's rather like a bag of worms.
--
73, Cecil http://www.qsl.net/w5dxp

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This is what I use Buck. Mine is a 132 foot dipole and I insert the lengths
with Omron 4PDT relays controlled by 2 decimal thumbwheel switches.

I just added another relay that ties the two sides of the twinlead together
and feeds the center conductor of the coax. I plan to use it on 160. I have
not tested it yet because conditions have been so bad with storms every day
this week.


"Buck" wrote in message
...

Thank you,

Is this the same program he http://www.qsl.net/w5dxp/notuner.htm ?

I have been looking at this awhile and wonder if the SWR on 17 and 10
meters can be better tuned by adding an additional 1/2 foot section.

It probably doesn't matter at that SWR.


another question related to the antenna:

Do you think this would work? Instead of switching the lead in and
out, could the leads be tapped at each band according to the matched
setting? So that instead of a series of knife switches, a double-pole
multi-throw switch could be used to select a band or frequency for
use?

Thanks again, gears are turning in my head again...


73 for now
Buck





On Wed, 8 Jun 2005 11:40:10 -0400, "Fred W4JLE"
wrote:

I can send you a copy of a program I wrote. It is based on Cecil's work.
You
can put in the length of the dipole you want to use, the frequency, and
type
of feed line. It gives you the choice of giving you the length of
feedline
for that single case, or a start and stop frequency in which case it
prints
out a chart of frequency vs. total length.Add jumpers to make up the
difference above 80 feet and your good to go!

For portable operation a 130 foot dipole fed with 80 feet of 300 Ohm to a
small piece of Plexiglas and two sets of banana jacks would allow you to
put jumpers of various lengths into the jacks. The second set goes to the
rig via a convenient length of 50 ohm coax with a choke balun of
ferrites.
Lengths of 1,2,4, and 8 foot would allow you to make up jumpers to enable
75
meters from 3.8 to 4 and all the other bands with the exception of 60
meters.

It can be made smaller if your only interested in 40 and up etc. Easy to
carry, no tuner and worst swr around 1.7:1

For example a 2 foot jumper would put you at 4.0, and a series of an 8,2,
and 1 jumper for 3.8

--
73 for now
Buck
N4PGW

Fred W4JLE wrote:
I can send you a copy of a program I wrote. It is based on Cecil's work. You
can put in the length of the dipole you want to use, the frequency, and type
of feed line.

That EXCEL program is nice. "imax.exe" is also available from my web
page. It was written in Quickbasic and executes in a DOS window.
--
73, Cecil http://www.qsl.net/w5dxp

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