Alpha 500 Fig 1

Alpha 500 Series

QUESCO is a prominent company specializing in low-cost and reliable sales, ensuring the prime quality of durable and rugged products for ideal customer satisfaction. Their ultra power-saving products provide optimal performance while being 100% waterproof, offering you the safety and convenience you need. Despite their robust attributes, QUESCO's products remain compact and lightweight enabling easy handling and mobility. Trust QUESCO to deliver affordable, resilient and energy-efficient solutions to all your needs.



The Alpha 500 series utilizes advanced microprocessor control with highly evolved system software That has redundant error-checking and correcting capabilities to ensure 100% error-free encoding, transmitting, receiving, decoding, and controlling all of the output relays. This highly evolved system software includes CRC (Cyclical Redundancy Check) and Hamming Codes (Error Recovery).


Safe and Reliable Operation

To ensure maximum operating safety the system incorporates numerous important safety features which include transmitter pushbutton fault-detection - visual warning - auto-shutoff, transmitter low-voltage detection - visual warning - auto shutoff, receiver fault-detention - auto-shutoff. and receiver MAIN relay auto disconnect then system is in sleep mode, radio interference. system run of receiving range and when transmitter low voltage  condition is detected


Secure Operation  

Both transmitter and receiver utilize advanced microprocessor control. The availability of 32.768 sets of unique ID codes + 20 distinct RF channels ensure that only Commands from a matching control transmitter can be carried out reducing the risk of interference from outside Sources.


Safety MAIN Relay Circuits

For added safety the receiver system utilizes a special 'Safety relay" for the receiver MAIN relay circuits If the receiver MAIN relay is defective (example: fails to open or close during operation or not responding to a 'Stop' command a fault will be detected and the System will be shut down immediately to avoid possibility of any accidents occurring.


Power Saving Circuits

The transmitter utilizes advance power-saving circuits providing more than 150 hours of continuous operation between battery replacements using  just Iwo (off-the-shelf “AA' alkaline The extremely long battery life eliminates  the need for frequent replacing or recharging of batteries


20/30 User-Selectable RF channels

The receiver IS equipped a PLL. (Phase Lock Loop) synthesized

RF module with 20(301MHz) / 30(433MHz) sets of user selectable RF channels (narrow band FM) adjusted via simple dip-switch settings. The transmitter is equipped with a unique removable transmitting RF board for easy replacement of transmitting RF channels.


Lightweight and Compact

The keypad arrangement results in a transmitter that is ultra lightweight and compact in design. Including batteries the transmitter handset is weighted at only 200g for the 4-button models. 240g for the 6-button models. and 290g for the 10-button models. This optimized design is almost 50% smaller and tighter than most competitive models and much easier to carry and operate


Waterproof and Durable

The transmitter and receiver enclosure are constructed from high grade composite materials that resist cracking and deformation commonly occurred from frequent drops and long term exposure to heat, sunlight and harsh environments. The enclosures are fully sealed and impervious to dust, water, oil, acids, alkaline, heat and  sunlight, which provide trouble-free operation in high moisture environments and outdoor applications


Industry's Best 2-speed Push button

Custom in-house designed 2-speed pushbuttons are extremely durable and reliable for a minimum of one million press cycles Unlike most s-speed pushbuttons available from other radio control manufacturers these pushbuttons are easily manipulated even when the operator is wearing gloves. The snap action steps provides positive tactile feedback to the operator.


Full compliance

The Alpha 500 series are designed and manufactured in accordance with FCC Part 15 Rules, European directives (CE/CB). Industry Canada Specifications (IC) and ISO[

9001 guidelines. No site license is required

10 Models


Alpha 520

(4) two-speed pushbuttons


Alpha 540 A

(6) one-speed pushbuttons + (1) AUX micro-button.

Alpha 560 S

(6) two-speed pushbuttons


Alpha 560 A

(6) two-speed pushbuttons + (1) AUX micro-button.

Alpha 580 B

(9) one-speed pushbuttons + (1) SELECT I/II pushbutton

Alp ha 580 C-1

(6) two-speed pushbuttons + (4) one-speed pushbuttons.


Alpha 580 C-2

(8) two-speed pushbuttons + (2) one-speed pushbuttons


Alpha 580 D

(10) two-speed pushbuttons


Alpha 580 E

(6) two-speed pushbuttons + (3) one-speed pushbuttons + (1) SELECT I/II pushbutton


Alpha  580 F

(8) two-speed pushbuttons + (1) one-speed pushbutton + (1) SELECT I/II pushbutton

For crane systems with auxiliary hoist and trolley changeover function (5 ~ 6 motions)

Alpha 500 Fig 2




Frequency Range

301 & 433 MHz



Narrow Band FM.

Channel Spacing



Decoding Reference

Quartz Crystal

Transmitting Range

100 meters


Frequency Control

Synthesizer (PLL)

Hamming Distance





Frequency Control

Quartz Crysal


Responding Time


Transmitting Power



Output Contact

250V @ 10A

Enclosure Rating



Enclosure Rating

IP-65 / IP-66

Source Voltage

3,OV ('AA" x 2)


Source Voltage

AC 24V - 440V,12-24VDC available

Current Drain



Power Consumption

11 VA

Operating Temperature

100C - + 700C


Operating Temperature

-100C - +700C

Dimension (500~520)

140 x 68 x 33 (mm)


Dimension (500~520)

310 x 134 x 72 (mm)


173 x 68 x 33 (mm)



310 x 134 x 72 (mm)


213 x 68 x 33 (mm(



300 x 230 x 86 (mm)

Weight (500~520)

200g (with batteries)


Weight (500~520)

1,625g (with output cable)


240g (with batteries)




(with output cable)


290g (with batteries)




(no output cable)