SAFETY INFORMATION SHEET

WARNING

INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS. FOR YOUR SAFETY, FOLLOW THE ENCLOSED INSTALLATION DIRECTIONS.

HOW TO INSTALL YOUR OUTDOOR ANTENNA SAFELY IN ACCORDANCE WITH THE RECOMMENDATIONS OF THE U.S. CONSUMER PRODUCT SAFETY COMMISSION

These safety recommendations apply to all SIRIO commercial, amateur and general purpose communication antennas. SIRIO antenne assumes no liability if faulty or dangerous installation practices are used. There are available, trained and experienced personnel to assist in installation, maintenance, or disassembly. Contact your local installer if consultation or assistance is required.

YOU, YOUR ANTENNA, AND SAFETY

Each year hundreds of people are killed, mutilated or receive severe permanent injuries when attempting to install an antenna. In many of these cases, the victim was aware of the danger of electrocution, but did not take adequate steps to avoid the hazard.
For your safety, and to help you achieve a good installation, please READ and FOLLOW the safety precautions below. THEY MAY SAVE YOUR LIFE!

1. If you are installing an antenna for the first time, please, for your own safety as well as others, seek PROFESSIONAL ASSISTANCE. Consult your dealer. He can explain which mounting method to use for the size and type antenna you are about to install.

2. Select your Installation site with safety, as well as performance, in mind. (Detailed information on Site Selection appears in a separate section of this booklet.) REMEMBER: ELECTRIC POWER LINES AND PHONE LINES LOOK ALIKE. FOR YOUR SAFETY, ASSUME THAT ANY OVERHEAD LINES CAN KILL YOU.

3. Call your electric power company. Tell them your plans and ask them to come look at your proposed installation. This is a small inconvenience considering YOUR LIFE IS AT STAKE.

4. Plan your installation procedure carefully and completely before you begin. Successful raising of a mast or tower is largely a matter of coordination. Each person should be assigned to a specific task, and should know what to do and when to do it. One person should be designated as the “boss” of the operation to call out instructions and watch for signs of trouble.

5. When installing your antenna, REMEMBER :
   DO NOT use a metal ladder. DO NOT work on a wet or windy day.
   DO dress properly -shoes with rubber soles and heels, rubber gloves, long sleeve shirt or jacket.

6. If the assembly starts to drop, get away from it and let it fall. Remember, the antenna, mast, cable and metal guy wires are all excellent conductors of electrical current. Even the slightest touch of any of these parts to a power line complete an electrical path through the antenna and the installer- THAT’S YOU!

7. If any part of the antenna system should come in contact with a power line- DON’T TOUCH IT OR TRY TO REMOVE IT YOUR SELF. CALL YOUR LOCAL POWER COMPANY. They will remove it safely.

If an accident should occur with the power lines call for qualified emergency help immediately.

SITE SELECTION

Before attempting to install your antenna, think where you can best place your antenna for safety and performance.

To determine a safe distance from wires, power lines and trees:

1. Measure the height of your antenna.
2. Add this length to the length of your tower or mast, and then
3. Double this total for the minimum recommended safe distance.

If you are unable to maintain this safe distance, STOP! GET PROFESSIONAL HELP. Many antennas are supported by pipe masts attached to the chimney, roof or side of the house. Generally, the higher the antenna is above the ground, the better it performs. Good practice is to install your antenna about 5 to 10 feet above the roof line and away from power lines and obstructions. Remember that FCC limits your antenna height to 60 feet. If possible, find a mounting place directly above your set, where the antenna wire can take a short, vertical drop on the outside of the house for entry through a wall or window near the set. Your dealer carries a complete line of installation hardware.

1. AVOID THIS LOCATION
2. The safe distance from power lines should be at least twice the height of the antenna and mast combined.

CHOOSE A PROPER SUPPORT AND MOUNTING METHOD

However you decide to mount and support your antenna always make sure that safety is your first concern. Some of the more common installation methods are illustrated below.

ROOF MOUNTED

1. TRIPOD MOUNT
2. COAXIAL CABLE
3. GROUND WIRE

ROOF MOUNTING

The swivel feature of “universal” type mounting brackets makes a convenient antenna mount for flat or peaked roofs. One clamp type bracket is used with 3 or 4 guy wires equally spaced around the mast and anchored to the roof or eaves by eyebolts. Apply roofing compound around the base of the bracket, screws and eyebolts for moisture sealing.

TELESCOPING MAST

Guy wires should be equally spaced in at least three directions. Use at least three guy wires for each 10 foot section of mast.

SIDE OF HOUSE MOUNTING

The safe distance from power lines is at least twice the height of antenna and mastcombined. Where roofoverhang is not excessive, the side of the house provides a convenient mounting. Position the brackets over a stud if possible, one above the other, and space two or three feet apart. For metal siding, first mark mounting holes, then drill pilot holes through the siding to accept mounting screws.

TOWER

Tower safety is paramount to a good installation and requires that you take location, tree growth, soil depth and proximity to buildings into consideration. Tower foundations must be securely based on a solid concrete/ tower mounting plate. An alternative is to sink a 4-6 foot section of tower into a concrete base for an extremely rugged mount. Proper guying is essential to a safe weather-resistant installation that must handle severe wind loading and is best accomplished with preformed guy grips, torque brackets and turnbuckles. When working on towers always use a safety belt made of high quality web-type material

1. TOWER
2. HOUSE SIDE MOUNT
3. COAX CABLE
4. MAST GROUNDED
5. GROUND WIRE
6. STATIC DISCHARGE UNIT TO GROUND ROD
7. TELESCOPING MAST

CHIMNEY MOUNTING

The chimney is often an easy and convenient mounting place. But the chimney must be strong enough to support the antenna in high winds. Do not use a chimney that has loose bricks or mortar. A good chimney mount makes use of a 5 or 10 foot, 1-1/4″ diameter steel mast, and a heavy duty two strap clamp-type bracket. Install the upper bracket just below the top course of bricks, and the lower bracket two or three feet below the upper bracket. For maximum strength, space the brackets as lar apart as possible.

1. MAST

GENERAL INSTALLATION INSTRUCTIONS FOR MAST MOUNTED ANTENNAS

1. Assemble your new antenna on the ground at the installation site. Keep separate assembly instructions that come with it. Large CB and Amateur beams may have to be finally assembled on the tower or mast.

2. On the ground, clamp the antenna to mast and connect the coaxial cable to the antenna.

3. To insure that the mast does not fall the “wrong way” if it should get away during the installation or takedown, durable non-conductive rope should be secured at each two foot level as the mast is raised. The boss stands in a position where he can yank or pull the ropes if the need arise to deflect the falling mast away from hazards (such as power lines) into a “safe fall” (such as a yard or driveway). The ropes are tied taut at the base of the mast after installation and in place at the various levels.

4. Install selected mounting bracket.

5. If you are going to use guy wire installation instead of a mounting bracket:
   – install guy anchor bolts
   – estimate length of guy wire and cut
   – attach a mast using guy ring

6. Carefully take antenna and mast assembly to mounting bracket and insert. Tighten camp bolts. In case of guyed installation, it will be necessary to have at least a second person hold the mast upright while the guy wires are attached and tightened to the anchor bolts.

7. Install self-adhering “ DANGER ” label packaged in antenna hardware kit at eye level on your mast.

8. Install ground rod to drain off static electricity build-up and connect ground wire to mast and ground rod. Use special ground rods, not a spare piece of pipe.

EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS

1. Use No. 10 AWG copper or No. 8 AWG or larger copper-clad steel or bronze wire, as ground wires for both mast and lead-in. Securely clamp the wire to the bottom of the mast.
2. Secure lead-in wire from antenna to antenna discharge unit and mast ground wire to house with stand-off insulators spaced from 4 feet (1.2 meters) to 6 feet (1.8 meters) apart.
3. Mount antenna discharge unit as close as possible to where the lead-in wire enters the house.
4. Drill a hole in wall (CAREFUL! There are wires in that wall.) near your set just large enough to permit entry of cable.
5. Push cable through hole and form a rain drip loop close to where it enters the house.
6. Put small amount of caulking around cable where it enters house to keep out drafts.
7. Install static electricity discharge unit.
8. Connect antenna cable to the set.

You should not attempt to raise a mast in excess of 30 feet in height/length (not including the antenna proper) in a fully-extended condition. Thirty to fifty foot tubular masts must be elevated, a section at a time, with the base or outer section secured in place with guy wires. GET PROFESSIONAL HELP.

ANTENNA GROUNDING PER NATIONAL ELECTRICAL CODE

1. MAST GROUND WIRE
2. GROUND CLAMP
3. MAST
4. ANTENNA
5. DOWNLEAD
6. STATIC DISCHARGE UNIT
7. TO SET
8. ANTENNA GROUND WIRE
9. GROUND CLAMPS
10. GROUND ROD

All articles displaying this symbol on the body, packaging or instruction manual of same, must not be thrown away into normal disposal bins but brought to specialised waste disposal centres. Here, the various materials will be divided by characteristics and recycles, thus making an important contribution to environmental protection.

SAFETY INFORMATION SHEET ID416 Rev.C

Gain-Master™ HW is a Half Wave high tech fiberglass base station antenna for 10m to 11m amateur band made of telescopic fiberglass tubes. Engineered with the most advanced available technologies it is completely manufactured in Italy with high quality materials. The design of the radiant element works like a central feeded dipole so all RF currents on the radiator are in-phase and the ground plane radials are not necessary. The coaxial coil at the bottom works like RF-choke for the optimum decoupling from mast and feeding line.

Electrical Data

Type|

0.5 λ center feeded vertical dipole

---|---
Frequency Range|

27.2 – 30 MHz (see tunable table pag.3)

Banwidth @ SWR ≤ 2.0|

1.8 MHz @ 27.2 MHz

Impedance|

50 Ω

Radiation|

Omnidirectional

Polarization|

Linear Vertical

Max Gain on the horizon|

0 dBd

Max Power|

500 Watts (CW) continuous

Connector|

UHF-female, PTFE insulator & gold plated central pin

Mechanical Data

Materials|

Whip made of white fiberglass three sections composite tube,
radiator made of copper wire and low loss coax cable, stainless steel hardware, anodized AW6060 aluminium,
UV stabilized thermoplastic

---|---
Wind Resistance|

up to 160 Km/h; 100 mi/h

Height (approx.)|

5560 mm; 18.2 ft with bracket

Packaging Dimensions|

1950x100x130 mm; 77x4x5 in

Weight (approx.)|

2.6 Kg; 5.7 lb

Mounting mast| Ø 35-60 mm; Ø 1.4-2.4in
side mast with “V” bolt

WARNING

INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS. FOR YOUR SAFETY AND BEFORE YOU BEGIN INSTALLATION, READ THE SEPARATE SAFETY INFORMATION SHEET.

Dear Customer, we thank you for purchasing a SIRIO Gain-Master™ HW antenna, we are sure you will give great satisfaction because it was designed with the most advanced technologies currently available and it’s entirely built in Italy with high quality materials.
Gain-Master™ HW is the result of four decades of experience in the antennas field; that allowed this unique product that will remain a standard reference for many years to come.

How Gain-Master™ HW works

As shown in Fig.1 the RF signal started from the generator run through the coaxial cable of the choke coil, then continue along the first part of the whip until it meet the termination of the coaxial line (antenna phase centre).
At this point, the signal on the inner conductor propagates along the upper half of the radiation element. The RF current travelling inside the cable shield, protruding outside the screen and descend toward the choke coil where the high impedance stop it (in fact, it’s equivalent to a centre-fed dipole).
Fig.2 shows the current distribution of SIRIO Gain-Master™ HW. The design of radiant element behaves as a centre-fed dipole, hence all currents are in phase.
This arrangement allowed us to have a radiation pattern equal to a dipole which has its maximum gain on the horizon.
Gain-Master™ HW has the highest available gain for 1/2λ antenna and due to its angle of radiation perfectly horizontal, enables the best possible connections.

Other Gain-Master™ HW advantages are:

It’s completely made and assembled in Italy with the finest materials available, starting from the whip which is carried out in three sections of 1.92m telescopic tubes with triple-layer fibreglass.
It makes Gain-Master™ HW much more durable and rigid then the competitors.
It does not require ground plane radials because it is a balanced antenna that function as a centre-fed dipole.
Thanks to it’s cable coil (RF-Choke) at the base, Gain-Master™ HW is fully decoupled from its supporting structure (poles, towers, etc.) with the benefit of preserving both the impedance that the radiation pattern.
It can be tuned in the range from 27.2 to 30MHz using the tuning table.
It accepts a maximum continuous power of 500Watts RMS.

Gain-Master™ HW Technical Informations

SAFETY FIRST: YOU CAN BE KILLED IF THIS ANTENNA COMES NEAR ELECTRIC POWER LINES. BEFORE DOING INSTALLATION, READ THIS MANUAL AND THE SUPPLIED SEPARATE SAFETY MULTI LANGUAGE INFORMATION SHEET.

SUGGESTION: We recommend to assemble the antenna on a flat ground open area. Use a good coax cable like BELDEN H1000R, AIRCOM PLUS or RG-213 as short as possible to get the best performance and we recommend to mount your antenna at minimum 3 meters above the roof, as far as possible from walls, power lines and other antennas.

TROUBLESHOOTING: Gain-Master HW is a tunable antenna. It is factory checked one by one. If you are unable to obtain an acceptable SWR reading from your antenna, follow these suggestions to try to solve the problem.

Check the coaxial cable and all its connections. Be sure that the cable is

not pinched, shorted, broken or kinked.

Check if the equipments (CB radio and SWR-meter) work properly. Make use of

owner’s manual for assistance in operating it.

Be sure that the antenna is installed at least 3 meters above the roof of

the nearest building and 5-6 meters above or away from any metal objects in the area.

ATTENTION: Important for a proper installation
In order to avoid excessive stress and possible damages to your
GainMaster, we recommend to make use of bracing rods for the installation in hazardous areas such as:
– Locations subjected to strong wind or constant gusts of wind (eg: coast and mountain areas).
– Locations with cold winter conditions and frequent formation of ice layers on the antenna body. In fact, the different distribution of the weight, can change substantially the resistance to the wind.
We therefore recommend at least 3 ties “NYLON” bracing to be fixed at the junction between 2° and 3° fiber pipe (see drawing).

Schematic diagram Fig.1

1. Electrical Length
   1/2 or 0,5 λ

2. Low Loss
   Coaxial RF choke

3. To RF generator

RF current Fig.2

TUNING TABLE

Frequency (MHz)

| L = (mm)| Band @ SWR=2
---|---|---
27.2| 1820|

26.3 ÷ 28.1 MHz

27.5

| 1783| 26.6 ÷ 28.4 MHz
28.0| 1734|

27.1 ÷ 28.9 MHz

10m band 28.5

| 1692| 27.6 ÷ 29.4 MHz
29.0| 1647|

28.0 ÷ 30.0 MHz

29.5

| 1611| 28.5 ÷ 30.5 MHz
30.0| 1550|

29.0 ÷ 31.0 MHz

NOTE: Use the table just as a guide. For fine-tuning please use an SWR- meter

TYPICAL S.W.R. RESPONSE

S.W.R.   Model: Gain-Master HW            File: F-01-031

Parts List

Pos

| Q.ty|

Part No

| Description
---|---|---|---

1

| 1|

SL06600

| Wired coaxial radiator

2

| 1|

–

| Bottom section with coil

3

| 1|

MA18016

| Ø 35×60 plastic sleeve

4

| 1|

CF02117

| 15.4x19x1920 fiberglass tube

5

| 1|

CF02217

| 19.5×23.5×1920 fiberglass tube

6

| 2|

FA00200

| Ø 16-27mm AISI316 hose clamps

7

| 1|

FA02400

| Ø 24-40mm AISI316 hose clamps

8

| 1|

TE07300

| Ø 18.8×17 radiator fixing part

9

| 1|

VT05900

| M4x6 AISI304 set screw cone point

10

| 1|

CH00800

| 2 mm Allen key

11

| 1|

TE05616

| Ø 18.8 PVC top cap

12

| 1|

IE560/USA

| self-adhering “DANGER” label

13

| 2|

VT01300

| M6x20 AISI304 hexagonal head screw

14

| 2|

ST04500

| Extruded aluminium bracket

15

| 2|

TI03100

| M6x206 AISI304 V-bolt

16

| 6|

DA01400

| M6 AISI304 hexagonal nut

17

| 6|

RO04200

| M6 AISI304 spring lock washer

Gain-Master™ HW Mounting Instructions

Step 1

• Insert the sleeve 3 against the lower fiber tube 2 and connect the cable 1.

Mounting needed tools:

n. 1 tape rules (meter)
n. 1 screwdriver flat point
n. 1 10 mm open jaw wrench
n. 1 plier
n. 1 electrical PVC tape
n. 1 nippers

a.

Screw on the connectors
WELL LOCKED!

b.

Seal both connectors with electrical PVC tape

c.

ATTENTION!
Do not bend or pinch the coaxial cable.

Step 2

• Insert the tubes on wiring

• Choose the working frequency from the Tuning Table on page 3 and the *L corresponding.
  Place tube 4* protruding L and the tube 5 protruding **L1= L-30mm

• Tighten the clamps 6 and 7 up to the locking of the fibererglass tubes 4 , 5 and 2.
  Tightening torque 3Nm max
  CAUTION: A over-tightening it may cause cracks and damage at the fiberglass tubes.

*L = see Tuning Table pag.3*
L1 = *L – 30mm**

Step 3

• Insert part 8 on cable until it stops

• Pull up the cable then return down 1÷1.5cm.
  REMARK: THE CABLE MUST NOT BE TIGHT

• Lock strongly the cable with screw 9 and key 10

Step 4

• Cut the extra cable
• Install the PVC cap

Step 5

1. Apply the DANGER sticker in a visible point

Strong steel mast
Ø 35-60mm (not supplied)

HI-QUALITY ANTENNAS MADE IN ITALY.

Gain-Master™ is a registered Trade Mark of SIRIO antenne s.r.l.

© Copyright SIRIO antenne – Technical Data are subjected to change – Printed in ITALY – Rev. 22/05/2024 – Cod. ID442

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