Table of Contents
What are delta loops?
Delta Loops are very practical single band HF antennas. Typically, they are arranged with equal length sides (an equilateral triangle) – having a horizontal side at the top or the base.
How does a delta loop antenna work?
The Delta Loop is not only a great transmitting antenna but a low noise receiving antenna. The direction of fire is broadside to the antenna. This means that if the base wire of the antenna goes from north to south, the direction of gain will be east and west.
Are Delta loops directional?
There is a common misconception that a Delta Loop Antenna is directional towards the open side of the loop. This is not the case at typical heights above ground. The plot above shows the pattern of the Horizontally Polarized version of the loop to be omnidirectional.
How do you feed a delta loop?
Feeding the Delta slightly up from the corner, around 1/4 of the side length up, results in vertical polarization. Note the current minimum is at the apex, and in the middle of the bottom. The often used “corner feed” skews the current and polarizations. At 28 degrees elevation, the delta loop has -.
Is a delta loop a balanced antenna?
This allows us to adapt an unbalanced system (coax cable) to a balanced antenna system (delta loop or quad-loop antenna). The characteristic impedance of a delta loop or quad-loop antenna is about 100 Ohm. The transceiver has an impedance of 50 Ohm, so an impedance transformation must also be made.
Where do you feed a delta loop?
Feeding the Delta slightly up from the corner, around 1/4 of the side length up, results in vertical polarization. Note the current minimum is at the apex, and in the middle of the bottom.
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).
How big is a 40m delta loop?
40M Delta Loop fed at top apex with total wire size of 140 feet and 6 inches. 40M Delta Loop SWR on 20M (14.19-14.3. Mhz) without antenna tuner If playback doesn’t begin shortly, try restarting your device.
Can You Help me put up a 40m delta loop antenna?
Several members of the Nashua Area Radio Club recently got together to help one of our members to put up a 40m Delta Loop antenna. Delta loop antennas are some of the best performing wire antennas and have the advantage that they can be easily supported via a single elevated mounting point such as a mast or a tall tree.
What is the eznec modeling result for the 40m delta loop?
The graphic above shows the EZNEC modeling result for the Vertically Polarized 40m Delta Loop. This design tends to concentrate the radiated energy at the lower takeoff angles which optimize the antenna for long DX contacts. This graphic shows the modeled pattern when the antenna is fed to create Horizontal Polarization.
Is a full wavelength horizontal ‘delta’ loop for 40m possible?
One kept coming back into my head as being something I could easily try at this new QTH – A full wavelength horizontal ‘delta’ loop for 40m. I have had many QSOs with operators which had very impressive results and experience on this full-wave 40 M loop.