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Optoelectronics/Displays??

Radar detector packs location-aware features

Posted: 07 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:radar detector? laser? RF circuit? GPS?

Night mode
The run-dark mode keeps detection events stealthy against nighttime officers looking for a telltale flash of light in a target vehicle.

To use all the features, you'll have to read the manual on this unit, despite its innocent-looking topside user buttons.

An internal frame in the two-piece plastic case supports the electronics for the 9500ix. Transparent lenses front and back cover the display and detector elements, respectively. A single cast-metal feedhorn is used to gather radar signals for all bands, and two IR laser detectors sit alongside and underneath the feedhorn for catching lidar bursts ahead of or behind the vehicle.

The RF pickup and signal processing for high-frequency radar reside mostly on a secondary assembly mounted to the main pc board. This front-end "RF engine" is labeled as coming from Beltronics, a company Escort acquired in 1999. The assembly may serve a variety of Escort/Beltronics detectors.

Passport 9500ix main board (Click on image to enlarge.)

The separately mounted low-loss laminate board contains elegant microstrip filters and mixing circuitry for the superheterodyne receiver. In combination with some likely downconversion on the RF board, radar detection comes from a National LMX2434 PLL oscillator that provides the appropriate mixing frequencies to obtain relevant IF signals.

The Rohm BH4127 IF detector outputs, in turn, get processed to discern and announce microwave-based threats.

Lidar detection is likely a far simpler task, with processing limited to acting on a response from the unit's IR detectors, which may feature either analog or even digital outputs to flag events at the 904nm wavelength of interest.


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