About Us

Ralph Mowery · July 25th 16, 09:55 PM posted to rec.radio.amateur.antenna

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.

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Tom W3TDH · July 25th 16, 05:28 PM posted to rec.radio.amateur.antenna

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

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Dx engineering 1:1 balun or ugly balun?	kb8viv	Antenna	11	November 18th 12 04:40 PM
TV 4:1 BALUN	JIMMIE	Antenna	20	January 26th 09 03:55 AM
SWL Newbies : The Magnetic Long-Wire Antenna Balun - A Balun It Ain't	RHF	Shortwave	0	March 29th 08 05:23 PM
Could a Balun Be Useful Here?	[email protected]	Antenna	3	May 18th 05 04:00 AM
Horizontal loop - balun or no balun ?	Per Enocson	Antenna	5	December 14th 03 01:28 AM

Menu

About Us