Is there an 80-20m Mag loop antenna?
This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. “Magnetic Loop Antenna”, MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound “Slinky” loop is described here.
Which is better a small or large loop antenna?
Yes, higher is better. A loop antenna is generally considered “small”, if its circumference is less than 10% of the operating wavelength. So in my case (for 80 mtrs), “small” would be a circumference of less than 8 mtrs, e.g., a circular loop with a diameter less than 2.5 mtrs (≈ 8.2 ft).
Is the end fed wire antenna a dipole?
An end-fed by your description is also a dipole, yet is isn’t yet wants to work like one. Which is why if your not careful you could have thousands of volts at the connection to your radio (or at some point on your coax sheild) under some circumstances. You’re confusing engineering terminology and nomenclature with physics. WG7X likes this.
Why are magnetic loop antennas called magnetic loops?
Below 10 MHz, our apartment building generates a large amount of “electro-smog” QRM. An STL tends to be less sensitive to picking up electrical noise in the near-field (< 1 λ), which appears to be the reason why this type of antenna is also referred to as a ” magnetic loop antenna”. STLs have a radiation pattern with directivity.
How big does a 2m Mag loop need to be?
Even on VHF (2 m band), the size of standard antennas such as HB9CV and Quads can still be sizeable or akward for portable operation. VHF loops can be made with the same construction techniques as for HF. However, for the 2m band, a 0.1 λ STL only takes an area of about 10×10 cm (4×4 inch).
How big is an 80 MTR circular loop?
So in my case (for 80 mtrs), “small” would be a circumference of less than 8 mtrs, e.g., a circular loop with a diameter less than 2.5 mtrs (≈ 8.2 ft). To be more precise, we are talking about a small resonant loop.