Radar information Pages

Kustom HR-11.

K band and speed timing "stop watch".

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Here is the head unit. This is an old unit and was ~ $3,600 when new.

 There is a remote and an antenna too.

This particular unit is a special one where traffic information can be obtained for traffic studies

VERY few law enforcement officers would use this type of unit.

Generally, the remote would be like this:  WITHOUT the front/rear antenna.

Antenna type and/or model number.

Looking into the receiver transmitter (no power)

You can see the cone where the microwave energy is focused.

Here is the back of the unit with the larger old style (4 pin) connector.

Here's the unit is various uses.

Neighborhood watch at home use.


and on the road where its primarily designed for.

The above photo shows a locked in speed reading from earlier.

Below the unit displays only the patrol speed as the traffic is moving with the vehicle.

K band radar 24.150 Ghz

This device works with large reflective surfaces such as cars & trucks.

How it works

Example start up for the testing shown here:

Plug in remote and antenna FIRST.

Plug unit in to cigarette lighter or regulated power supply 12 volts.

Power up (left switch rotate clockwise) unit in Standby mode

If the right knob isn't turned from "CLK" the unit transmits NO radar

and the unit is used by the remote in stopwatch mode.

(The above photo is transmitting radar at a low-est power/distance setting)

Below 21.0 is seconds elapsed in a stopwatch use, speed is shown in "target"

If the operator wants to use the radar from the antenna,

the knob needs to be "clicked" from "CLK" towards "Range"

Turning the knob further right puts out more radar energy, increasing the units' range.

The angled white hash marks are the limit(s) of travel.


Using the remote button "hold" the unit transmits no radar energy.

This is the instant on feature.  "HLd" is displayed as no previous reading was held

and to remind the operator the unit is active.

Once a target speed is acquired and wanted to lock in the display (hold)

The top center button is depressed to "hold" the reading: 36 above.

No Speed reading when "locked" (red button) will yield a 0 in the target window.

Here no speed reading is locked Display says "HLd"

This means the unit is in instant on use.  Ready to clock a vehicle.


Basically red button: "Lock Rel" to hold/capture a speed reading.

"Lock Rel" (again) to release the held reading then obtain a new speed reading.

"HLd":  To stop transmitting radar energy (for instant on)


000 thumb wheel is the timer function and is distance (pre-measured) in:

EXACT YARDS.  3 feet = 1 yard ~ 36".  Similar to a meter = 39"

For example "500" is what NH uses in their aircraft timing marks. (1,500 ft)

"440" would be a quarter mile.  Max speed reading is 256 MPH & related to distance.

Maximum distance 999 or 0.56 miles (Right knob MUST be on "CLK")

Lock-Rel button is remote substitute if there is no remote.

Test:  Tests the unit and lights all the display segments so a 9 dosen't show as a 3.

H.S.L is High Speed Lock (retains highest speed) which is outlawed these days.

Man - Auto:  Manual or Automatic input

Mon:  Monitor, allows officer to blank his patrol speed in the patrol window.

Sta - Mov:  Toggles between stationary use "target only"

or Moving using both displays

Timer / VASCAR

The unit when in "CLK"

will transmit NO radar energy and be used as a (user input) distance timer.

The above photo shows an error because a time was recorded

outside of the capabilities of the unit. (Less then 3.5 sec in a 1/4 mile)

I recorded the above time sequences when the motorcycle

kid in the summer of 2004 was recorded at 205 MPH by aircraft.


There is an audio "doppler" sound from the units speaker (left dial) on the unit.

Turn from "power" towards "Audio" for increasingly louder sound.

It puts out a tone which changes when a car or reflection is returned to the

antenna from the K band signal sent out.


This unit squelches the white noise.

It also squelches the doppler audio when a vehicle exits the beam.

Operator needs to listen to this (annoying) while clocking to verify a valid reading / target.

This audio is critical to determining (visually) which vehicle is in the beam of the radar unit

and to establish a "tracking history".

Field Report.

The unit runs through a diagnostic start up procedure, supposedly the unit won't work if somethings wrong.

I've had the unit not power up correctly 4 times.  "Err" was displayed.


Sometimes the "patrol" display window doesn't display a reading due to a intermittant connection?


The unit can obtain reading prior to completing the "diagnostic start up procedure"

if the unit has been on and the power is interrupted or the cord is jiggled.


Timer and VASCAR function dependant on operator error and distance programmed into unit.

Shorter distance means MORE error.

See below:

Cross Readings or Interference:

High power radios, transmitters, power lines are all documented sources of interference.


Surprisingly, this unit was very susceptible to interference from the defroster fan.

Even at highway speeds with reflective surfaces around. (not large signs)

There is a supplied bracket supposed to be installed over the

defroster fan and between the antenna to prevent this.


This unit produces a patrol speed or target speed of 32 MPH

when used in a 1991 Audi 200 with the defroster fan turned on high.


It has given "ghost" reading(s) from 32 - 57 MPH

when no other targets are present in moving mode.

Tuning Forks.

I cross referenced these five forks:

80 MPH X - gives ~34/5 MPH on the K band unit

65 MPH X - gives ~28 MPH on the K band unit

60 MPH X - gives ~26 MPH on the K band unit

30 MPH X - give ~13/14 MPH on the K band unit

65 MPH K - gives ~149 MPH on the X band unit.

This table means each X and K frequency band(s) will overlap into each other

in determining the speed of a target.  Direction of the target (towards or away from) will

determine if there is a frequency overlap or not.

Glossary & Reference:

Strike * :  Some manufacturers claim to strike the metallic

tuning fork on a non-metallic surface to produce an accurate tone.

Striking a tuning fork on a metal surface can dent the fork, and/or damage it,

or create false overtones which will affect readings obtained by the unit.

Timer / Distance:    1/4 mile = 1320 feet

NH aircraft timing marks = 1500 feet or 500 on the distance thumb wheel

1/2 mile = 2640 feet

1 mile = 5280 feet

These units have 5 digits in their serial number.  This unit 10217 was purchased on Ebay.

Sample rate:  is how often a new reading is taken and displayed. 

This unit has a slow (1 second or so) sample rate.

Quick acceleration or deceleration (rumored to be 3 ft per second) will affect this unit.

KR-11 operates on K band radar is 24.150 Ghz frequency.

Squelches:  Mute, lower volume, silences, makes bearable the sound of the Doppler reflection

Timer:  Timer function is user defined by distance. Similar/same as VASCAR

HR-11 Field Certification from the state of NY reference:

The next generation of this unit is the Kustom H.A.W.K.

The stopwatch distance is ten time(s) greater. 

It has TWO antennas for front and back for directional clocking of vehicles

No statistics though.

See it here