Does a loop antenna need a balun?
If signals came only from the loop, then sure, there would be no need for a balun. But the feedline is also effectively a big vertical antenna in the common-mode, and is going to pick up signals as such.
How long is an 80m loop antenna?
Length of a full-wave 80-meter loop is about 270 feet long (1005 divided by frequency in MHz) or about 67 feet per side.
How do you attach a wire to a balun antenna?
The eyelet on either side is used to connect to the antenna wire. Usually you would make a loop with the end of the antenna wire through the eyelet and then wrap the loose end around the antenna wire. The pig tail lead from the balun is then wrapped around the antenna wire and soldered.
How do I choose a balun?
Select a balun closest to the antenna feedpoint impedance (you’ll have to get this from textbooks or modeling), and use it at the feedpoint or where the feedline from the antenna ends. Be sure the feedline between the balun and antenna feedpoint matches the antenna impedance as closely as possible.
How do you feed a full wave loop antenna?
The feed point impedance of a full wave loop antenna is theoretically in the vicinity of 100 ohms and requires a 2:1 impedance transformer to match with 50 ohm line or a 1.5:1 transformer to match with 75 ohm cable. These transformers are unbalanced (coax input) to balanced (loop output) (also called 2:1 baluns).
What is a balun for antenna?
A balun: balanced to unbalanced is an electrical device that converts between a balanced signal and an unbalanced signal, or feed line. A balun can take many forms and may include devices that also transform impedances but need not do so.
Can I install my own TV antenna?
So, whilst it is possible to install your own TV antenna, it is highly recommended to get a professional installer. The use of professional signal meters alone, will save possible hours in trying to find signal and align the antenna, and get the best possible reception on each TV channel.
When should you use a balun?
A Balun is used to “balance” unbalanced systems – i.e. those where power flows from an unbalanced line to a balanced line (hence, balun derives from balance to unbalanced). As an example, consider a coaxial cable connected to a half-wave dipole antenna shown in Figure 1.
What ratio balun do I need?
Use a 4:1 or 6:1 balun attached directly to the antenna legs and use a second “1:1” balun immediately attached to the first. In doing so, the first balun will provide the impedance match and the second balun will perform the primary function of impeding CMC.