On 07/22/2016 12:44 PM, Ralph Mowery wrote:

Does anyone have a good link or design for a 6:1 balun ?


Hello, and are you sure of the required impedance ratio? What operating
frequency range (bandwidth) is required? The 6:1 ratio seems oddball
since in most practical applications integer-squared values suffice. A
6:1 broadband balun using tapered transmission lines (no ferrites
required) is realizable but I think the fabrication required is not
something most hams would want to tackle.

Having said all that a quick Google results in a number of hits
including how-to U-toob videos. Sincerely, and 73s from N4GGO,


--
J. B. Wood e-mail:

In article , says...

On 07/22/2016 12:44 PM, Ralph Mowery wrote:

Does anyone have a good link or design for a 6:1 balun ?


Hello, and are you sure of the required impedance ratio? What operating
frequency range (bandwidth) is required? The 6:1 ratio seems oddball
since in most practical applications integer-squared values suffice. A
6:1 broadband balun using tapered transmission lines (no ferrites
required) is realizable but I think the fabrication required is not
something most hams would want to tackle.

Having said all that a quick Google results in a number of hits
including how-to U-toob videos. Sincerely, and 73s from N4GGO,

Yes, I want a 6:1 balun. It is for an off center fed antenna that is up
around 50 to 60 feet. To be used from 80 to 10 meters. I have had one
up for a number of years and used a 4:1 bought balun that is suspose to
be good for 5 KW. It heats up and the SWR goes up after several minutes
of SSB usage with about 1200 watts. Works fine at 600 watts. My
research seems to incicate that at that height a 6:1 is a beter match.

I have seen a few that seem to use way too many turns for the core and
size of wire I am using (number 14 enamel type).

I tried one that had 2 windings of 11 turns and tapped at 9 turns and it
was not any good at all when I tested it.

Found another design that used 5 wires and 5 turns each. I am now in
the process of building it. Layed out on the bench hooked to a RLB it
looks good. So now to get it into a box and hooked to the antenna.

I built one using the same lengths of wire for field day and at 25 feet
the swr looks a lot beter than mine at 60 feet. Thought I would try a
6:1 as that is what some research seems to indicate at that height.

I agree, 6:1 does seem to be an odd ball number and info hard to come
by. I did see some info on one that used two seperate cores and the
winding on each core for a 4:1 and then paralled or something for the
6:1. I just did not like that design.

I don't think a tapered line would work over a broad range,and even if
it did, I would not want to try to build and use one.
Sort of comes under the open wire feeders. I just would not want to use
them due to getting the feeders into the shack.



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On 07/25/2016 10:10 AM, Ralph Mowery wrote:

I don't think a tapered line would work over a broad range,and even if
it did, I would not want to try to build and use one.
Sort of comes under the open wire feeders. I just would not want to use
them due to getting the feeders into the shack.


Hello, and again, while not advocating these for ham use, decades ago
J.W. Duncan and V.P. Minerva in the February, 1960 issue of Proceedings
of the IRE described a hundred-to-one bandwidth tapered-line balun. The
one constructed for the article provided for interfacing a 50-ohm coax
to a 15O ohm open wire line. VSWR never exceeded 1.25 from 43 MHz to
2200 MHz (50:1 bandwidth). Sincerely,


--
J. B. Wood e-mail:

On 7/25/2016 9:10 AM, Ralph Mowery wrote:
In article , says...

On 07/22/2016 12:44 PM, Ralph Mowery wrote:

Does anyone have a good link or design for a 6:1 balun ?


Hello, and are you sure of the required impedance ratio? What operating
frequency range (bandwidth) is required? The 6:1 ratio seems oddball
since in most practical applications integer-squared values suffice. A
6:1 broadband balun using tapered transmission lines (no ferrites
required) is realizable but I think the fabrication required is not
something most hams would want to tackle.

Having said all that a quick Google results in a number of hits
including how-to U-toob videos. Sincerely, and 73s from N4GGO,

Yes, I want a 6:1 balun. It is for an off center fed antenna that is up
around 50 to 60 feet. To be used from 80 to 10 meters. I have had one
up for a number of years and used a 4:1 bought balun that is suspose to
be good for 5 KW. It heats up and the SWR goes up after several minutes
of SSB usage with about 1200 watts. Works fine at 600 watts. My
research seems to incicate that at that height a 6:1 is a beter match.

I have seen a few that seem to use way too many turns for the core and
size of wire I am using (number 14 enamel type).

I tried one that had 2 windings of 11 turns and tapped at 9 turns and it
was not any good at all when I tested it.

Found another design that used 5 wires and 5 turns each. I am now in
the process of building it. Layed out on the bench hooked to a RLB it
looks good. So now to get it into a box and hooked to the antenna.

I built one using the same lengths of wire for field day and at 25 feet
the swr looks a lot beter than mine at 60 feet. Thought I would try a
6:1 as that is what some research seems to indicate at that height.

I agree, 6:1 does seem to be an odd ball number and info hard to come
by. I did see some info on one that used two seperate cores and the
winding on each core for a 4:1 and then paralled or something for the
6:1. I just did not like that design.

I don't think a tapered line would work over a broad range,and even if
it did, I would not want to try to build and use one.
Sort of comes under the open wire feeders. I just would not want to use
them due to getting the feeders into the shack.

I don't understand. The antenna is 300 ohms from 80 to 10 meters? This
boggles the mind.

In article , says...



I don't understand. The antenna is 300 ohms from 80 to 10 meters? This
boggles the mind.

No, the antenna is not 300 ohms from 80 to 10 meters, but it is
somewhere around that for most of the ham bands from 80 to 10 meters.

The main thing for me is to get it below a SWR of 3:1 or so over the ham
bands. Many of the OCF antennas will not do 5 MHz, 10 MHz, or 21 MHz
with a low swr. That is ok with me as I don't work 10 and have a
triband beam that covers 21 MHz. If I really want to work the few
frequencies at 5 MHz I can always use my manual tuner and just take a
hit on the losses which probably are not too much at that frequency and
feeding the antenna with 100 feet of some rg 8 type coax.

The antenna I put together for field had a very low swr (below 2:1) on
most bands but 15 meters where it was about 5:1. That was at 25 or so
feet. The same length antenna at 50 to 60 feet at my house and the swr
is much higher. That is the reason to go from a 4:1 to a 6:1.

When it cools off some I will put the now completed balun on the antenna
and see what it does.




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In article t,
Ralph Mowery wrote:

Yes, I want a 6:1 balun. It is for an off center fed antenna that is up
around 50 to 60 feet. To be used from 80 to 10 meters. I have had one
up for a number of years and used a 4:1 bought balun that is suspose to
be good for 5 KW. It heats up and the SWR goes up after several minutes
of SSB usage with about 1200 watts. Works fine at 600 watts. My
research seems to incicate that at that height a 6:1 is a beter match.

Since the feedpoint impedance of an OCF is a function of the feedpoint
location (how far off-center it is), could you reduce the impedance
towards 200 ohms and use a 4:1 balun by simply moving the feedpoint
some distance towards the center?

In article ,
says...

In article t,
Ralph Mowery wrote:

Yes, I want a 6:1 balun. It is for an off center fed antenna that is up
around 50 to 60 feet. To be used from 80 to 10 meters. I have had one
up for a number of years and used a 4:1 bought balun that is suspose to
be good for 5 KW. It heats up and the SWR goes up after several minutes
of SSB usage with about 1200 watts. Works fine at 600 watts. My
research seems to incicate that at that height a 6:1 is a beter match.

Since the feedpoint impedance of an OCF is a function of the feedpoint
location (how far off-center it is), could you reduce the impedance
towards 200 ohms and use a 4:1 balun by simply moving the feedpoint
some distance towards the center?

While that sounds like a good idea, it also shifts the frequencies where
the SWR is low, especially when trying to get it to work with low swr
over most of the ham bands below 30 MHz.

I could lower it to about 25 feet and use the 4:1 but I want it as high
as I can get it which is about 50 to 60 feet now.
Mostly flat as it is suported on the ends and near the middle around the
same heigth.

Part of the heigth is so I can use the Carolina Windom idea of using a
voltage balun and dropping from the feed point about 20 feet. and
putting in an in line choke. I don't know if it will work as they
say,but suspose to give some vertical radiation along with the
horizontal.



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On Monday, July 25, 2016 at 6:55:50 AM UTC-4, J.B. Wood wrote:
On 07/22/2016 12:44 PM, Ralph Mowery wrote:

Does anyone have a good link or design for a 6:1 balun ?


Hello, and are you sure of the required impedance ratio? What operating
frequency range (bandwidth) is required? The 6:1 ratio seems oddball
since in most practical applications integer-squared values suffice. A
6:1 broadband balun using tapered transmission lines (no ferrites
required) is realizable but I think the fabrication required is not
something most hams would want to tackle.

Having said all that a quick Google results in a number of hits
including how-to U-toob videos. Sincerely, and 73s from N4GGO,


--
J. B. Wood e-mail:

300 Ohms is the typical impedance of a folded dipole at it's resonant frequency. I converted a used Terminated Folded Dipole to a simple folded dipole by removing the termination resister and the 12 to 1 balun. I used an SGC antenna coupler with it with great success. I wanted to use the build in antenna tuner in my Yaesu FT-1000 with it but that was futile until I bought a 6 to 1 balun and connected it to the antenna with 300 Ohm window line. Now the built in tuner has no trouble obtaining a match from 160 to 6 Meters. I was told by many on an antenna usenet group that I could use a 4-1 balun and 450 ohm ladder line rather than bothering with the 300 ohm stuff and the 6 to 1 balun. In each case using the 450 LL and the 4-1 balun both separately and together the internal tuner would fail to match the load on many frequencies. Once I changed to a complete match at resonance the internal tuner could manage the rest.

--
Tom