Description

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Sigma SE HF-360XP:The Sigma Euro-Comm Ltd HF360 is an end fed vertical antenna, capable of allowing the user to work 80 meters through to 10 meters using an ATU. The antenna can be pole mounted at ground level or elevated depending on the user’s personal requirements. The antenna is rated at 1KW* pep. The antenna comes with fixings and installation guide.
How it works: The antenna is fed using 50 Ohm coax via a SO-239 socket at the base of the unit a 4:1 UNUN transformer is located in an IP65 weather sealed box at the bottom of the bracket section of the fiberglass elements. The antenna comes in four parts, three fiberglass poles and one stainless steel tapered whip. The transformer reduces the impedance at the feed point to a more acceptable level making the antenna much more efficient and allowing proper and easy tuning via an external ATU and automatic ATU’s found in most modern radios.

Specifications:
Frequency range: TX / 3.5 – 30 MHz
RX: 1.8 – 55 MHz
Power handling: 1 kW PEP or CW & 200 watts max for data modes
Type: End fed vertical
Impedance: 50 Ohms
Connector: SO-239
Length: 5.5 meters 18 feet

The antenna can be grounded if the user experiences excessive local static noise, but as the UNUN is DC grounded: grounding will not affect the tuning ratios.

BAND WITH ATU:
3.5 MHz 80m / 1.1
5 MHz 60m / 1.1
7 MHz 40m / 1.1
10 MHz 30m / 1.2
14 MHz 20m / 1.1
18 MHz 17m / 1.1
21 MHz 15m / 1.1
24 MHz 12m / 1.1
28 MHz 10m / 1.1
29 MHz 10m / 1.1

NOTE: 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.

Measurements were made using a Yaesu (FTdx-1200) and internal ATU and a Yaesu (FT-450D) and external LDG-1200 ATU.