Instruction manual
Thank you for purchasing the SE HF-360 VERTICAL, this instruction sheet should help you get the best from your new antenna.
The SE HF-360 consists of 3 Fibreglass vertical radiating sections and one stainless steel top whip and an UNUN transformer
used to lower the high impedances found at the feed point of the vertical to the 50 Ohms that is required by your transceiver.
-Type End fed vertical antenna
-Frequency TX/ 3.5 — 52MHz (with ATU)
RX/ 1.8 — 55MHz (with ATU)
-Max power 400 Watts
-Impedance 50 Ohms
-Connector SO-239
-Height 5.5 metres
Assembly and Mountina:
-Before you install your antenna, select the most available open site away from power lines and telephone lines. The antenna can be
mounted at ground level or at height so giving you many options on installation.
-Assemble the fiberglass elements ensuring that the lock washers are used and that the steel whip is inserted into the top
section fully and that the two grub screws are securely fastened.
-Mount the antenna using the U-bolt or other attachment.
-At the top of the base cradle place the three nuts and bolts into the black moulding and secure.
-Attach the PL-259 plug on the 50 Ohm feeder coax to SO-239 socket on the transformer at the base of the antenna.
-We recommend that you should always earth at the tuner point rather than at the transformer for best performance and safety.
Pack contents:
2x Fiberglass poles.
1x Fiberglass pole with base cradle + transformer attached.
1x 1.35 metre steel whip
2x Lock washers
3x Top moulding nuts and bolts + washers.
2x U-Clamps + washers and nuts.
1x Alan key for top whip.
Please note:
This antenna is for amateur radio and broadband receiving use. Do not use other than for the purpose of antenna.
Please use the antenna within the standard specifications described in this manual. Failure to do this may cause heat and break
down of the transformer unit.
Warning: High RF currents are present on the antenna when transmitting.
Sigma Euro-Comm SE-HF 360 Fibre Glass Vertical antenna
The Sigma Euro-Comm Ltd HF360 is an end fed vertical antenna, capable of
allowing the user to work 80 meters through to 6 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 400W 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 6:1 UNUN transformer is located in an IP65 weather sealed box
at the bottom of the bracket section of the fibre glass elements. The antenna comes
in four parts, three fibreglass 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.
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.
The Highlighted bands in the chart below will require a manual ATU, the others
an internal ATU.
80 m 1:3.1 (Manual ATU) Specifications
60 m 1:1 Type End fed vertical
40 m 1:1 Frequency TX / 3.5 - 52 MHz
30m 1:1 RX / 1.8 - 55 MHz
20m 1:1 Power handling 400 watts pep
17m 1:1 (Manual ATU) Impedance 50 Ohms
15m 1:1 Connector SO-239
12m 1:1 (Manual ATU) Length 5.5 meters 18 feet
10m 1:1
6m 1:1 (Manual ATU)
Please use a good quality 50 Ohm coax, RG-213 or Mini 8 are probably the best choice.
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