Big Boy PST-61

Big Boy PST-61

Price: $1,545.00

Model: PST-61
Manufacturer: PRO.SIS.TEL, Italy
Warranty: 2 years

eHam Review
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The BIG BOY model PST-61 is rated at 4.1 square meters of antenna.

The real true rating of any rotator is NOT just based on the wind load, but very much on the rotating, starting and braking torque. To understand more, see the Real Truth tab.

Wind load area4.1 m2
Rotating torque3800 Kg/cm
Braking torque29000 Kg/cm
Vertical load850 Kg
Rotation speed/360+/- 90″
Rotation range500 degrees
Motor voltage12 Vdc
Control cable requiring5 core wire
Display readout accuracy1 degree
Rotor weight16 Kg
Output shaft diameter28 mm
Rotor height H39 cm
Rotor width W120 cm
Rotor width W228 cm
Total shipping weight18 Kg


  • High strength cast aluminium gear box
  • Rugged and proven design
  • Nickel chromium-molybdenum steel and bronze alloy gears running on ball bearings
  • No maintenance, life lubricated
  • Strength steel galvanized mast clamp
  • Temperature range -40° to + 90°C
  • Stainless steel bolts

Features of the PST-61 Rotator

  • Rated at 4.1 square meters of antenna via DOUBLE worm gear technology
  • Braking torque – specifications exceed all rotator manufacturers (see Comparison Table tab)
  • High starting torque (see Comparison Table tab)
  • 12 Vdc motor
  • Advanced worm gear technology, irreversible under mast torque
  • Large chromolly steel output shaft 28 mm without sweep and backlash
  • Time of rotation (approx.) – 1 minute 30 seconds (programmable speed)
  • Range of rotation – 500 degrees (360 +/- 70 degrees )(programmable)
  • 75 mm compression jaws type mast clamp (included)
  • Utilizes 5 conductor rotator cable
  • Long cable runs (up to 180 meters)
  • Rugged proven design (used for 10 years throughout Europe, Asia and the Far East)
  • 2 years warranty – parts and labour

The following items are included in the package:

Rotor with mast clamp, stainless steel bolts, rotor cable’ connectors, printed user manual.

Please refer to the separate tab heading “Controllers” for details on controller options

Rotator Controllers

We offer you a choice of three controllers for your Big Boy rotators:





Control Box D

This control box is for the PST61/71 rotators and gives you a fully computer programmable/controllable antenna rotator. You can configure it according to your specific antenna system requirements. It can become a controller for azimuth or elevation rotator.

During controller alignment and quality tests, the controller has a default configuration, which can be reprogrammed using the “tool software” series supplied. Users who do not have a PC, can change some controller features using on board dip switches.

PRO.SIS.TEL$735.00More details

RT-21 Standard

The Green Heron standard rotator controller, the RT-21, is a universal digital controller that can be user configured for motor voltage and position feedback. This flexibility allows the RT-21 to operate any commercial amateur rotator being built today, and virtually any rotator ever built.

Includes USB cable and printed manual. Unit is configured to order. Software and other resources available on the website.

Green Heron Engineering$1045.00More details

RT-21D Deluxe

The Deluxe RT-21D includes an extremely fast and bright VFD display along with a coordinated black chassis and front panel.

Includes USB cable and printed manual. Unit is configured to order. Software and other resources available on the website.

Green Heron Engineering$1245.00More details
Wind antenna m2Rotating torque kg/cmBraking torque kg/cmVertical load kgRotating speed x 360Rotating Range Deg.Motor power VoltRotor cable wiresPosition readoutRS232Preset
Orion 28003.93.25520.00081870 – 100360+1442-475digitalyes?
Yaesu G2800DXA32.500-80025.00030050-12036024 – ?6analogoptopt
Yaesu G1000DXA2.21.100-6006.00020040 – 10036024 – ?5analogoptopt
Yaesu G800SA21.100-6004.0002005536024 – ?5analogoptopt
Yaesu G650A26005.0001006336024 – ?5analogoptopt
Yaesu G450A16003.0001006336024 – ?5analogoptopt
Hyg. HDR 3002.75.8138.7201.100?36024 – ??analogopt?
Hygain T2X2.21.17010.465450?36024 – ??analogopt?
Hvg. HAM IV/V1.79305.8003706036024 – ?8analogopt?
PST6411.210005.500650+ 60″50012 VDC5digitalyesyes
PST20512.52.00012.500850+ 60″50012 VDC5digitalyesyes
PST614.03.80029.000850+ 90″50012 VDC5digitalyesyes
PST718.814.00052.3251.450+ 120″50024 VDC5digitalyesyes
PST-110D1320.00080.0001.500+ 120″50024 VDC5digitalyesyes


There are many factors that affect the ability of a rotator to turn or hold (brake) an antenna or array, in the short term as well as over the anticipated life expectancy of the rotator itself. These factors are both internal and external. Internal considerations are related to the design and construction of the rotator, including the housing, type of gear, type and size of motor and brake mechanism and associated control system, and the bearings, especially those that take the vertical and the lateral loads imparted by the antenna mast. External factors are related to the size and configuration of the antenna system to be rotated, whether or not the rotator is mounted inside of the tower with an external thrust bearing, the wind load (commonly expressed in square feet [sq. ft.] of effective surface area) along the mast, and the weight of the rotating system.

Most manufacturers simply state that their rotator will handle an antenna of a certain number of square feet. This is where magic and guesswork take over from physics and engineering. Knowing the surface area (sq. ft.) is not enough. Assuming that the wind load measurement is accurate, you would need to know the wind speed at which the rating has been established. Is it 50 mph or 80 mph, steady state or gusts, from which (or changing) direction? Does it make a difference if the elements or boom are long and thin or short and thick? Does it matter if the antenna is six inches or ten feet above the rotator or thrust bearing? Does it matter if there is one antenna on a five-foot mast or three antennas on a twenty-foot mast? Does it make a difference if it is below freezing and there is an inch of ice coating the whole business? You bet it does! In fact you may be betting your life or at least the life of your rotator on it.

How can you decide which rotator you need for your application? Let Prosistel take the guesswork out of it for you. It all pretty much boils down to a few not so mysterious specifications, and they relate to the torque or turning force available to get the system moving from rest, keep it turning, bring it to a stop and hold it in place. These specifications are called:

STARTING TORQUE – maximum turning force that the rotator is able to produce as it comes up to speed from a dead stop. The greater the starting torque and rotating torque the less time it takes for large arrays and stacks to come up to full rotational speed.

ROTATING TORQUE – turning force available to overcome friction and the effects of wind.

BRAKING TORQUE – amount of torque the rotator can resist that is induced by winds or other loads trying to rotate the antenna system from it’s braked position.

VERY SIMPLY – The larger the numbers, the more the rotator can handle and the longer it will last.

Now, compare the starting, rotating and braking torque specifications of “BIG BOY” to any other rotator on the comparison table tab and you will be amazed. Also, take a good look at the weight differences, brake types, size of motors used and you be the judge. See for yourself how the BIG BOY line of rotators makes the others look like plastic toys.

See Comparison Table tab.

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