The Sigma Euro-Comm DELTA- 40-HP-QRO 1kW
Multi Band Full Wave Loop Antenna Wire Antenna
The DELTA-40HP 1kW is a full wave loop designed to operate on 40m (7MHz), 15m (21MHz) and 10m (28MHz) without an ATU and other bands with an ATU.
There is a 4:1 balun at the feed point enabling it to be fed directly with 50ohm 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 50ohm impedance.
The loop comes complete with three insulators to provide anchor points. It may be mounted flat (horizontal) or raised to a vertical or near vertical position.
It may be configured as either a square loop (Quad) or equilateral triangle (Delta).
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.
*1kW power rating is for intermittent amateur radio use (CW or PEP) for data modes (FT-x, RTTY, etc) or constant carrier data modes a lower maximum of 200 Watts is recommended.
*If you are using a high-power amplifier it is essential that an external ATU is used between the antenna and the amplifier, otherwise damage may occur.
Delta Loop Specifications
Max Power 1000 Watts CW, 1000 Watts PEP
Forward Gain 3.2 dBd max
SWR
7.05 MHz 1.5:1
21.15 MHz 1.7:1
28.02 MHz 1.1:1
Dimensions of overall loop 40.56m
Three equal sides 13.52m
Four equal sides 10.14m
Radiating wire Poly flex weave non kink
Feed Point Balun 4:1 HP
