Delta C-240 - 2 Element Compact HD 40m Yagi

It covers up to 120KHz of the 40m band under 2:1 SWR without an ATU. this is not a characteristic that most ‘short’ Yagis share, this is a result of the combination of capacity hats and large diameter coils that have been moved further out along the element lengths.

Coil loading is a required aspect of many lower HF antennas but is not by any means efficient. Additionally, the closer any coils are to the dipole centre, the more inefficient they become (and the narrower their bandwidth).

The use of high-efficient, wide-spaced coils and capacity loading to produce a 12m wide 40M rotating dipole with a radiating efficiency of just over 89% and secured far more bandwidth than us usual on a Yagi this size.

The capacity loading has allowed for the coils to be moved further out along the element lengths to improve efficiency and bandwidth and the solid structure with fast taper ensures no guying is needed as the antenna can fully support its own weight.

This Antenna is Seriously HD. Centre dipole section is 55mm (almost 2''1/4) Diameter with 2mm wall and the antenna has a fast taper to the end sections which are still a full 25mm (1'') diameter where the capacity loading is. Boom is 60mm diameter with s 2mm wall.

Specification

• 2:1 SWR Bandwidth: up to 120KHz - class leading
• Freepsace Gain: 6.29dBi
• Gain 20m up: 10.53dBi
• F/B: 15dB typ.
• Antenna width: 11.5m
• Antenna Length: 7m
• Turing Radius: 6.73m
• Effective Wind area: 1.25 SqM
• Antenna Weight: 50 Kilos