GPS Speed Sender Rev C

High Quality GPS Speed Sender For Automotive Applications

Hummingbird's Global Navigation Satellite System (GNSS) Speed Sender provides a reliable calibration-free replacement for mechanical speed senders.

Using data received from Satellites the GNSS Speed Sender calculates three-dimensional ground speed and provides a pulsed output compatible with existing mechanical speed senders. This high-technology solution eradicates the dependency on vehicle specific parameters, thereby reducing installation time and eradicating the need for periodic calibration.

Powerful Performance

Designed for harsh automotive environments, the module features transient voltage protection on the supply and short circuit protected outputs.

The ability to track American GPS, Russian GLONASS and Chinese BeiDOU navigation satellites simultaneously, enhanced receiver sensitivity and active antenna result in fast time-to-first-velocity-calculation as well as the ability to operate in the harshest RF environments such as canyons and cities.

Last known position and satellite information critical to fast start-up are battery backed in case of power failure.

Three dimensional velocity calculations are acuurate to 0.2km/h and pulse output rates are updated 10 times per second. The device is fully configurable and offers following features:
  • 1000 to 10,000 pulses per kilometer (ppk) settable via adjustment screw.
  • Fixed 2000, 4000, 8000 or 50,000 pulse per kilometer option.
  • Option to add back distance lost in tunnels.
The speed sender is supplied with an external bulkhead mount antenna (active) for challenging installations.
The speed sender works equally well with speedometers calibrated in kilometers per hour or miles per hour.

Rugged Hardware

GNSS Speed Sender passive is supplied in a rugged ABS plastic enclosure with provision for screw mounting when required. Antenna connection for the active antenna is provided through a gold plated threaded SMA connector.The bulkhead mount antenna supplied is suitable for exterior mount, on the roof of the cab 

Power to the unit and pulse outputs are provided through four colour-coded wires.

Red and green LEDs are provided to give the user status information. At power on, the red LED will begin to flash at 2Hz, indicating that the unit has power and is searching for satellites. When satellites have been acquired the red LED will remain on. The green LED flashes in sympathy with the pulse output and so will flash faster as the vehicle speed increases.

Performance Specifications

  • Pulse rate: variable (1000ppk to 10 000ppk) or fixed 2000, 4000, 8000, 50,000
  • General: 56 channel tracking receiver, battery backup 12days
  • Update rate: 10Hz
  • Accuracy, horizontal: < 5m (50%), < 8 (90%)
  • Accuracy, altitude: < 10m (50%), < 16 m (90%)
  • Accuracy, velocity: < 0.06m/sec = 0.22km/h
  • Acquisitions, after loss of lock: < 2s (90%)
  • Acquisitions, first time power applied: < 38s (50%), < 42s (90%)
  • Acquisitions, temporary loss of power: < 10s (50%), < 13s (90%)
  • Operational limits, altitude: 18000m
  • Operational limits, velocity: 300km/h

Electrical Characteristics

  • Input voltage: 6V to 36V
  • Power consumption: 240mW (12V, 20mA)
  • Battery backup: 12 days
  • Output pulse: peak to peak voltage: 5V, DC 2.5V
  • Output pulse: maximum current drain: 25mA

Physical Characteristics

  • 50mm (L), 67mm (W), 21mm (H)
  • Antenna: 47mm (Dia), 27mm (H)
  • Antenna cable length: 3-5m

Environmental Specifications

  • Operating temperature: -40°C to +85°C
  • Storage temperature: -55°C to +105°C
  • Humidity: 5% to 95% R.H. non condensing at 60°C

Interface Specifications

Power and pulse output:
  • Red input voltage (6V to 35V)
  • Black ground (0V)
  • Green pulse output
  • Blue inverted pulse output
RF interface (where applicable):
  • SMA (compatible connector supplied with antenna)


Hummingbird Electronics has designed the product for use in a broad range of applications. It is however solely the customer's responsibility to evaluate the device and determine it's suitability in their end application.

Hummingbird Electronics does not suggest or make any recommendation as to the suitability of parameters that determine angle, height, impact, speed, force, accident, harsh braking, roll-over or rate-of-turn events, input or output voltage or current. Parameter values stated or implied in this document are for explanation only and should not be taken as typical or representative of a real world situation.


Products are not authorised for use in critical safety or other applications where a failure may reasonably be expected to result in personal injury, loss of life, or catastrophic property damage. If a customer uses or sells the products for use in any such applications, the customer acknowledges that such use or sale is at customer's sole risk. The customer will indemnify, defend or hold Hummingbird Electronics and their electronic component suppliers/assemblers harmless from and against any and all liabilities and costs arising out of or in connection with use of product or sale.
GPS Speed Sender Rev C
  • GPS Speed Sender Rev C

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