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Circular FM Antenna High Power 3kW

-0.8dBi Gain
3kW HIGH POWER AVAILABLE
VSWR ≤ 1.5 AT TUNED FREQUENCY
OMNI DIRECTIONAL
CIRCULAR POLARIZATION
AVAILABLE WITH DIN 7-16 CONNECTOR
LIGHTWEIGHT AT UNDER 3Kg
EASY ASSEMBLING FOR NOVICES
STAINLESS STEEL OR ALUMINIUM
PRICE INCLUDES SHIPPING

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'Cycloid' True Circular Polarization

This square shaped 'cycloid' antenna gives true circular polarization and can handle immense power. It is available in 800W (N type) or 3kW (DIN-716) and in Aluminum or Stainless Steel. We believe it's the best value and most robust circular antenna for your money on the market, you won't get a better deal than this.

Circular FM Antenna 3D Radiation Pattern

Circular FM Antenna H-Plane (view from above) Radiation Pattern

Circular FM Antenna E-Plane Side (view from side) Radiation Pattern

Circular FM Antenna E-Plane Front (view from front) Radiation Pattern

Wideband Tunable From 87 to 108 MHz

The full wideband frequency tuning is easy. The tuning bar you see on the picture has two positions, one for 87 to 98 MHz and the other for 98 to 108 MHz. The bottom or top half of the 87 to 108 MHz band is selected with this bar and then the vertical tubes are adjusted in length to arrive at the exact frequency between 87 to 98 MHz or 98 to 108 MHz. A VSWR of less than 1.3 can be expected at the chosen frequency.

Stacking for High Gain

Stacking this antenna to obtain increased ERP is absolutely possible and encouraged. Stacking 2, 4 or 8 circular antennas is normal, this can be done using traditional splitters or driving them from separate amplifiers up to 3kW each. For example, eight of these antennas stacked driven by eight separate amplifiers of 3kW each would result in radiated circular polarized signal of 150kW EIRP or 90kW ERP, that's about as big as it gets for FM broadcasts. Go to 2, 4 and 8 Way Circular Antennas

Do You Have A Question?

High Power 3kW

The antenna is constructed from large aluminum or stainless-steel tubes and there are no small coils or capacitors that can burn out, it is designed for pure power! The only limiting factor to the power of this circular antenna is the RF coaxial cable connector. In the case of N-type this is 800W and with DIN-716 it is 3kW. The whole design is elegant with simplicity that we arrived at over years and years of field testing by clients and modeling by our technical department. It is a masterpiece of antenna engineering.

Do you want cable for your antenna?

Gain (Isotropic)	-0.8dB dBi
Frequency Range	87 - 109 MHz
Bandwidth	+/-2.5 MHz 1.5 VSWR
Construction	Aluminum and Teflon
RF Connectors	N type / DIN 7-16
Impedance	50 ohm unbalanced
Polarization	Circular
Maximum RF Power	0.8kW / 3kW
Weight of Antenna	2.3Kg / 3.9kg
Wind Speed Handling	90 MPH

Circular FM Antenna High Power 3kW E-Plane Radiation Plot

USER MANUAL

ANTENNA

Incorrect antenna can cause RF burns and levels of RF exposure above the recommended limits for personnel

Under NO CIRCUMSTANCES should the antenna be mounted and used at ground level or within a few meters of personnel.

A tuned antenna with the 50 ohm coaxial cable should be used. This should give a return loss ideally of 16dB (SWR 1.4) or better at the operating frequency. The RF plug should be PL259 (UHF) or N type, depending which is fitted to the FM transmitter.

Ensure that all antenna connections are sound, this is important as poor connections and soldered joints can cause RF burns to personnel, severe noise to the transmission and excessive RF bandwidth. Do NOT connect the antenna to the transmitter yet.

Ideally the antenna for this transmitter should be ideally mounted 20 meters high and clear of any surrounding objects to get maximum range and more importantly to reduce risk of radio frequency radiation to personnel. When mounted at 20 meters in height off ground and using 3000 watts of transmitter power, power flux density measurements made at ground level directly under the antennas described above show less than 1 W/m2. Several European countries use a value for the power flux density of 10 W/m2 as a basis for considering whether or not an area is safe. The issue of radio frequency radiation limits is a contentious one and work in this field is continuing worldwide.

User Manual - Circular 'Cycloid' Polarization Antenna Parts Layout Image 1

User Manual - Circular 'Cycloid' Polarization Antenna Parts Layout Image 2

Qty	Antenna Parts
1	A. Cycloid (square) main dipole with RF connector and Teflon support
2	B. Vertical radiator with: ◼ 1 x M6 x 50mm screw ◼ 1 x M6 washer ◼ 1 x M6 spring washer ◼ 1 x 25mm diameter tube ◼ 1 x 19mm diameter tube ◼ 1 x 25mm hose clamp
1	C. Joining clamps with: ◼ 4 x M6 x 50mm screw ◼ 8 x M6 washers ◼ 4 x M6 spring washers ◼ 4 x M6 nuts
1	D. Boom extension
1	E. Tuning arm / gamma match bars with: ◼ 2 x M4 screw (7-16) / 1 x M4 Allen head screw (N-Type) ◼ 4 x M4 washers (7-16) / 2 x M4 washers (N-Type) ◼ 2 x M4 Spring ◼ 2 x M4 nut (7-16) / 1 x M4 nut (N-Type) ◼ 2 x M6 x 50mm screws ◼ 4 x M6 washers ◼ 2 x M6 spring washers ◼ 2 x M6 nuts ◼ 1 x 10mm aluminum sleeve

Qty	Antenna Parts
1	F. Mast fixing clamps with: ◼ 2 x U-bolts ◼ 4 x M8 washers ◼ 4 x M8 spring washers ◼ 4 x M8 nuts ◼ 4 x M6 x 50mm screws ◼ 8 x M6 washers ◼ 4 x M6 spring washers ◼ 4 x M6 nuts

TOOLS YOU WILL NEED

◼ PVC or better Self Amalgamating Tape
◼ Metric Tape Measure
◼ 7mm, 10mm, 13mm Spanner
◼ Phillips screwdriver for M4 screw for 7-16 model
◼ Allen key 3mm for N-Type model

ASSEMBLY - CYCLOID DIPOLES

Assemble the four cycloid dipoles exactly as shown in the image. Make sure the spring washer and plain washer are used together, next to one and other, and tightened, this will prevent the screws working loose in the wind.

For best performance, all the pieces marked with '1' should go with each other, then '2', '3' and '4'. This is the way and order they were tested at our factory.

MHz	Tuning Arm (E)	L cm
88	LO	44
93	LO	39
98	LO	34
98	HI	33
103	HI	29
108	HI	25

Select from the table the frequency that is the nearest match to your frequency and the position of the Tuning Arm (E) and the length L cm.

Using M6 x 40mm Screws, two plain washers, a spring washer and a nut tighten the Tuning Arm (E) into the LO or Hi position. Loosen the hose clamps on both Vertical Radiators (B) and adjust the length of both as shown in the image to L cm, then re-tighten the hose clamps so the tubes cannot move.

User Manual - Circular 'Cycloid' Polarization Antenna Antenna Assembly Part 1

INSTALLTION NEAR POWER LINES

Following is a list of precautions to follow when installing the antenna if placement of antenna and cables is anywhere near power lines.

Erect antenna on side of house or building as far away as possible from the power line.
Avoid crossing antenna cables under electrical power lines.
Do not attach antennas to towers, poles or similar structures carrying electrical power lines.
If you are not experienced in installation of antennas, have experienced persons assist you.
During installation, tie off antenna with rope so if it falls it can be diverted away from power lines.
Avoid fastening antennas, especially self-supporting types, to old chimneys or to any chimney not designed to take such stress. Forces created by a strong wind may be sufficient to topple both chimney and antenna.
Make sure antennas have been properly grounded and provided with other necessary lightning protection.

EM COMPATIBILITY

When writing this manual there was no EU directive regarding the EMC (Electro Magnetic Compatibility) of Band II VHF broadcast antennas, however in our view there are some potential EMC compatibility issues that need to be addressed when installing this antenna system. On completion of the antenna installation check;

1. All the cables entering the connectors are tight and properly crimped or soldered

2. All the connectors are screwed in tight and sound.

3. PVC insulation tape and/or self amalgamating tape are wrapped around all the connectors to stop water entering the connector and the inside of the body of the cable.

If any cables are loose or there are bad connections this can cause some non-linear resistance, diode action or some small arcing. When this happens it creates EMC disturbance (arcing and crackling sound) across a wide frequency spectrum.

MAINTENANCE

Because antennas are passive devices maintenance requirements are low, however don’t accept low as being none existent, some periodic inspections are required.

Always following a heavy storm or extreme weather condition an inspection should be done and as shown in the table below.

WEEKS	Building Roof	Light Duty Tower	Heavy Duty Tower
13
26
39
52

LEGAL ADVICE

We sell this equipment to professionals and organizations in good faith it will be used correctly and legally. Nearly every country in the world require licensing for this type of equipment. It is the customer's responsibility to check relevant laws, directives, regulations and licensing requirements before installing or putting this product into service with an antenna system. You, the customer or user agree to defend, indemnify and hold harmless Aareff Systems Limited, it's employees and agents, from and against any claims, actions or demands, including without limitation legal and accounting fees, alleging or resulting from improper or unlawful use of this equipment.

ALL RIGHTS RESERVED. Aareff is a trademark of Aareff Transmission Systems. All contents of this document including, but not limited to the images, logos, text, illustrations are protected by copyrights, trademarks and other intellectual property rights which are owned and controlled by Aareff Transmission Systems or by other parties that have licensed their material to Aareff Transmission Systems. This document in part or whole may not be copied, reproduced, republished, uploaded, posted or distributed in any way, including by e-mail, ftp or any other electronic means

Every care has been taken in the preparation of this document, errors in content, typographical or otherwise, may have occurred. If you have comments concerning its accuracy, please contact Aareff Systems Limited (UK)

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