Multiple Frequency Shared Technology & Other Control Options

‘Multiple Frequency Shared’ technology allows up to four systems to operate on a single frequency by employing advanced data compression techniques. It is structured to minimize the actual ‘on-air’ time of any single transmission. This allows for multiple transmissions having a minimal response time and thus being able to share a common frequency.

The MFS system is designed so that a transmitter will send a signal for a predetermined ‘on’ time, and will then turn off. The length of this ‘on’ time is referred to as a ‘data burst’ or ‘packet.’ It is programmed into the MFS system software.

The packet length is a function of the quantity of data to be sent and the data (or baud) rate. Once the packet is sent, the transmitter turns ‘off’ and reverts to a ‘standby’ mode. This allows time for the other transmitters to send their data on the same frequency.

MFS adds as much as 40% to the life of a battery as compared to continuous carrier systems. Because the frequency related parts are common to several systems, excess inventory is unnecessary.

To summarize, MFS:

  • Allows up to 4 systems to ‘time share’ one radio frequency
  • Simplifies frequency coordinator’s task of reviewing, assigning, approving channels
  • Increases battery life
  • Reduces spares requirements
  • Operates at 4800 baud or greater to minimize system response time
  • Uses advanced synthesized technology that is programmable into any number of predetermined frequencies.


For a receiver and a transmitter unit to communicate with one another, each has to be set to the same access code. An access code plug is a feature that allows for an easy change of access code.

Without the plug, the transmitter case has to be opened and a switch that is mounted on a microcomputer module must be reset manually. With the plug, however, there is no need to open up the transmitter: similarly configured transmitters can easily be interchanged among systems simply by swapping the plugs.

Universal Spare Transmitters (USTs) can be brought online quickly by removing the plug from the main transmitter and placing it in the UST’s receptacle.


An option for these radio remote controls is Controlled Range, which provides a ‘circle of safety’ with regard to the crane being operated or being permitted to start. Outside the circle, pre-selected crane movements are automatically disabled, thus ensuring close control.

The ‘Controlled Range’ transmitter is part of the main control transmitter and transmits its own distinct signal as soon as the power switch or the start switch is turned on. Controlled Range may operate either by radio control or infrared.

The system can be made to disable all functions or just selected functions as determined by the required operational parameters. When the operator is out of the predetermined range of the system, those functions that were programmed to be disabled will not operate.


Pitch and catch is a special setup of multi-box operation with two transmitters. The pitch & catch feature allows a crane to be controlled by two different transmitters on a first-come/first-serve basis, but with a smooth transfer of control between operators doing a single job together.

The first operator may gain control of the crane and use it for as long as he keeps his transmitter ‘on.’ While he is in control, the second operator is automatically locked out.

When the first operator wishes to release control of the crane, he will signal his intent to the second operator. The first operator will relinquish control by turning ‘off’ his transmitter. The second operator will have already turned on his transmitter and have pressed and released the start button.

The second operator will have now gained control of the system and a smooth transfer of control will have taken place.