Houston Radar’s SS400 Doppler sign activation/speed sensor/Doppler Radar is a state of the art milli-power Digital Signal Processing (DSP) based K-band radar for the sign activation and traffic calming markets. It is the premier product in its class available in the world.
SS400 Open Frame
SS400 Weather Proof
- World’s smallest and lowest power usage OEM K-Band Doppler radar at 0.05 Watts, 12X lower than our DR500S radar and up to 50X lower than some other industry offerings
- Upgraded hardware has increased the range to 450+ feet (130+m)1
- Advanced rain rejection algorithm rejects over 95% of rain pickup2
- Ground speed tracking and measurement mode
- FCC pre-approved with CE mark
- Fully configurable via RS232 serial port for all settings
- Simple rotary switch or thumbwheel input possible to set threshold
- Wide input operating range allows solar operation
- 1.75Wx1.65Hx0.5D in (44x42x12 mm) open frame ultra-thin profile
- 1.9Wx2.1Hx0.9D in (4.5×4.8×2.4 cm) weatherproof enclosure option
- Firmware “boot loader” allows for field upgrading of firmware
- Two LED Lamp outputs to drive 1.8W LED lamps with dimming
- One photo sensor input to sense ambient light to dim LED lamps
- 100% self-test feature built-in including self power usage
- Best in class “Advanced In-Radar” traffic statistics option available
- True Average Speed feature built-in for very low cost, easy to deploy, average traffic speed measurements on the road
- IO expansion board w/ DB9 connector, rotary s/w and isolated high power output available
1During the transition period (serial numbers starting with 2311xxxx through 2407xxxx) we shipped both previous hardware and upgraded hardware as we consumed existing inventory. Previous hardware meets our range specification of 300+ feet (90+m) typical pickup range for a compact vehicle.
2Compared to previous generation and regular Doppler radars.
| Title | Description | Download |
|---|---|---|
| SS400-Short-Form-Data-Sheet | DownloadPreview | |
| SS400-User-Manual-Rev5 | DownloadPreview | |
| Android App - Download from Google Play Store | Download from Google Play Store | Download |
| Houston Radar’s Advanced In-Radar Statistics Package | DownloadPreview | |
| Houston Radar Stats Analyzer Installer | Download |
Specification | Recommended Condition |
Vcc | 6.0V to 18VDC |
Icc@12VDC | 4.5 mA (0.054 Watts) |
Radar RF out | 5 mW maximum |
Radar fcenter | 24.125GHz or 24.200 GHz |
Operating °F (°C) | -40 (-40) min to 185 (85) max |
Pickup Distance | 450+ feet (130+ m) in most cases* |
SS400 Speed Measurement Range | 0.66mph to 220 mph (1.06km/h to 354 kph) |
SS400U Speed Measurement Range | 0.16mph to 55mph (0.25 km/h to 88 km/h) |
Beam Angle | 38°x45° |
Beam Polarization | Linear |
Lamp 1 & 2 out | 135 mA max each up to 60VDC |
Lamp dimming | 180 Hz PWM from 5 to 100 % |
LDR light input | 0 to 3.3V input |
FCC ID | TIASS400 |
CE Mark | Yes |
Dimensions | Open frame 1.75Wx1.7Hx0.5D” |
Boxed | |
Weight | 0.05Kg (0.1 lbs) approx |
* Specification for upgraded hardware after date code 2407. Units with earlier date codes are 300+ft (90+m) unless specified.
Pin # | Function |
1 (Triangle Mark) | GND |
2 | Do not connect |
3 | Reserved. Do not connect |
4 | Reserved. Do not connect |
5 | Reserved. Do not connect |
6 | Reserved. Do not connect |
7 | Trigger "open drain" output #1 |
8 | Trigger "open drain" output #2 |
9 | RS232 Transmit from radar |
10 | RS232 Receive into radar |
11 | VCC |
12 | GND |
Part # | Image | Accessory | Description |
 | Added Cable* | Added cable for weatherproof radars past the standard 2 feet | |
JBX |  | Junction Box* | Junction Box |
Stat/Alc | Advanced In-Radar Statistics for Data Logging | ||
SS300 IO Board |  | SS400 Radar Input/Output Connector Interface board w/ DB9 connector, speed threshold s/w and sensitivity setting | |
PD300 IO Board |  | PD300/SS400 Radar Input/Output Connector Interface board w/ DB9 connector. No Mosfet or rotary switch. | |
900-0014 |  | SS400 Open Frame DB9 Cable | SS300 Open frame 12 core 2feet (0.5m) 1:1 cable with female Molex connector on both ends. |
900-0017 |  | SS400 Open Frame Interface Cable | SS400 open frame interface cable with female Molex connector to female DB9 |
900-0021 |  | SS400 Weatherproof Interface Cable | SS400 weatherproof interface cable with male Molex connector to DB9 |
USB-RS-P1 |  | USB Power Dongle | USB power supply and PC COM port serial interface for Houston Radar sensors |
120-0010 |  Front View  Back View | Tuning Fork | 3310Hz 46MPH Radar frequency check tuning fork |
BT-RS-P2-E-DTE |  | External Antenna Bluetooth | Class 1 long range Bluetooth module with male DB9 and external antenna in DTE configuration |