4 to 1 balun
Today’s bit of homebrew saw me wind and test a 4:1 Current Balun – The PZT Shack features an aerial connection plate in the wall cavity which includes a couple of 1:1 Choke Baluns – One of these is in full-time use connecting the 300-ohm balanced feeder of my Doublet to the back of my MFJ-948 ATU. Construction of 4:1 Unbalanced to Unbalanced, Ruthroff voltage transformers (UnUn), where one end of the windings are connected to ground and the centre connection is used as the 50 ohm feed point. This configuration has a reduced upper frequency limit in comparison to the same transformer when being used to feed a balanced load.
Installation Notes for Baluns & Ununs
Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters.
Guanella balun for 1 to 55 MHz - korpi.biz
Balun 1:4, dual coil Guanella balun for 1 to 55 MHz CC-BY OH1AYR Rev 1.1 Date 07.10.2013 Dual coil current balun 1:4 This is a traditional Guanella-type current balun, used as impedance transformer with high impedance balanced transmitting antennas. This medium power balun can handle far over 100W of …
korpi.biz/balun 1 to 4 dual.pdfInstallation Notes for Baluns & Ununs
Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters.
https://www.balundesigns.com/content/Wire Lengths for 4 and 9-1 ununs.pdfThe Antenna Balun - laarrl.org
connected together. This then forms a 4:1 balun which works at only one frequency. Another narrow band design is to use a λ/4 length of metal pipe. The coaxial cable is placed inside the pipe; at one end the braid is wired to the pipe while at the other end no connection is made to the pipe.
laarrl.org/pdfs/upthecoax3.pdfWhen is a Balun, not a balun, when it is an UNUN
When we say a Balun or UNUN is a 4 to 1 device it will work just as well backwards. A 4 to1 balun can also match 50 Ohm to 12 Ohms, and a 9 to 1 can match 50 Ohm to 5 ohms. Working in the forward direction a 1 to 1 is 50 in 50 out. A '4 to 1' will convert the 50 ohms of your coax to 200 ohms ' ie 4 times'
www.philipstorr.id.au/radio/technical/Balun and UnUn.pdf33ft Verticals and 4:1 Ununs - g8jnj.net
The 4:1 balun and coax fed remote tuner and also the broadband antenna Ununs produced signal levels about 20dB down on 160m, 6dB down on 80m and an average of about 3db down with dips of > 6dB on 40m through to 10m. Obviously these parameters will change with …
https://www.g8jnj.net/33ft Verticals and Ununs.pdfCVARC 4:1 Balun Project Kit
CVARC 4:1 Balun Project Kit by AE6YC New to the amateur radio world or have been around long enough to be considered an old timer, whichever you will never forget the first kit or homebrew project you built. For me it was a ‘cat-whisker’
www.cvarc.org/resources/Tech_Articles/dual_core_balun_construction_project.pdfA 9:1 Balun For Your End Fed Antenna - Mobileers
Installation of the 9:1 balun/unun: The End-Fed is connected to one terminal of the 'high' winding and the other terminal is connected to a good 'EARTH' ground. One or more copper rods or pipes driven, at least, 4 feet into the earth near the dwelling entry point (2 or 3, is better, being spaced about 4 feet apart).
mobileers.com/main/wp-content/uploads/2013/01/9-to-1-Balun-for-End-Fed-Antenna.pdf
More On The 1:1 Balun - nonstopsystems.com
high-frequencyresponses of the 4 1 balun. This article can besaid to bea complemenl tothe 4:1balunarticle. Inthiscaseit treatsthe much more popular 1.1 balun. It begins with my viewon when to usea balun. Even though much of what has been written here is taken from my Summer 1992 article in Communica tions Quarterly.' it is presented again here,
https://nonstopsystems.com/radio/pdf-ant/balun-sevick.pdfBaluns: Choosing the Correct Balun By Tom, W8JI General ...
better if the balun passed the line impedance through without stepping impedance down. 3. 4:1 Baluns inside antenna tuners, which are usually voltage-type baluns, are generally poor performers when presented with mismatched loads. 1:1 current baluns are generally much more efficient and have a much wider operating impedance and frequency range. 4.
static.dxengineering.com/pdf/Choosing the Correct Balun.pdf I needed a simple portable HF antenna. A long wire and some insulators is pretty easy to carry. To connect it to the radio I needed a Balun.These are such simple things but yet they cost so much from some places. I decided to make my own and did it for less than $5. A Balun is used to match a balanced line to an unbalanced line. An Unun is used to match an unbalanced line to another unbalanced line. This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line.
If you plan on stringing up a dipole you use 2 equal lengths of wire with the Balun in the middle. You can run the wire straight across the field or better yet use a V shape, either inverted or not. In an inverted V you raise the Balun to a high point on a mast and the elements extend down to the ground. I prefer a regular V where the Balun is near the ground and the elements extend up to two masts or trees, buildings etc nearby.
Even simpler is a long wire end fed antenna. You just need a single wire and a ground rod. Here you need an Unun. The only difference between the Unun and Balun is how you connect the feed line.
For the antenna wire I have even used a spool of Mig wire in a pinch.
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