The Sigma Euro-Comm Delta 20 HP is a Full Wave Loop designed to operate on 20 m (14 MHz) and 10 m (28 MHz) without an ATU and other bands (20 m, 17 m & 10 m) with an ATU. There is a 4:1 balun at the feedpoint enabling it to be fed directly with 50 ohm Coax, RG-213 or Mini 8 is probably the best but other variations of coax may be used so long as they are of a 50 ohm impedance.
The Loop comes complete with Three Insulations to provide anchor points. It may be mounted flat (horizontal) as either a square Loop or Equilateral triangle or raised to vertical or sloping position. If mounted flat it will be good for near DX or NVIS work and if raised to vertical or sloping it will also be good for working futher afield.
Full Wave Delta Loop:
Configured as a delta loop or equilateral triangle, if laid flat will be good for near DX. If vertical, or near vertical will provide low angle radiation which is good for long range DX in the direction of the loop (looking straight on at the front) and near DX off the sides. Gain 3.2dBd.
Full Wave Quad Loop:
If laid horizontally will be good for NVIS, if vertical 2.8dBd gain. Sloping at 45 degrees will provide low angle DX.
Delta Loop Specifications:
- Max Power: 500W CW or 600W PEP
- Gain: 3.2 dBd max
- Impedance: 50 Ohm
- Dimensions of overall loop 20.28 meter
- Three equal sides 6.76 meter
- Four equal sides 5.07 meter
- Radiating wire Poly flex weave non kink
- Feed Point Balun 4:1 HP