Radar information Pages

Kustom H.A.W.K.

K band dual direction radar

and speed timing "stop watch".

Here is the head unit.

<<< Field Report >>>

An upper level work horse in the law enforcement community when new.

Use of the unit (clocking speeds) is restricted to the remote control. 

Only modes can be selected from the unit itself.

 Here is a remote and an antenna too.


This particular unit can clock vehicles with radar in front and in back of the police cruiser.

Additionally, this unit can distinguish between same and opposite direction targets.

Older antenna types (left) and (right) smaller / newer antenna(s)


Looking into the receiver transmitter (no power)

You can see the (metalic) cone where the microwave energy is focused.

Inside the antenna housing are circuit boards


Below are the fasteners to hold the antenna together.

It is the same style antenna as the older HR-11 unit.

HOWEVER:  If you get an upgraded model, the back connectors

are smaller and the antennas are tiny like the Ka band types. (~4")

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

Below, are the newer (smaller) style connectors.

Use as:  Radar  Stop Watch / Vascar


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(s) 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 left knob isn't turned from "STPW." the unit transmits NO radar

and the unit is used by the remote [ONLY] in stopwatch mode.

(The above photo is NOT transmitting radar)

ONLY a 1 or a 0 can be the thumbwheels first digit. (by design)

Below 15.3 is seconds elapsed in a stopwatch use,

speed is shown AFTER thumb locking in time.

Here's how it was done:

Start by pressing Lock / Rel on remote: Once to clear, Twice to start.

Counting up 14.0, 15.2

Stop by Lock / Rel button at 15.3 to lock in time on stop watch.

The next photos show a simulated NH State Police reading over a 1500 ft clocking zone:

Due to rounding 20.9 seconds displays the same as 20.0 seconds.

(in the display) unless "DTS" is depressed.

(Estimate) Table: 

20 seconds =  MPH

21.0 seconds =  MPH

24 seconds =  MPH

25 seconds =  MPH

26 seconds =  MPH

27 seconds =  MPH

28 seconds =  MPH

29 seconds =  MPH

30 seconds =  MPH

Unit will beep when out of clocking parameters.

To NH's credit: 

Their longer clocking distances mean less operator error.

Although a second on the start and finish can result in 4 MPH.

The next photos show a simulated aircraft  reading over a 1320 ft clocking zone:

TESTING unit counter:

The "44" in the counter wheels correspond to 440 yards. 

Target and Patrol reflect this.  This is a 1/4 mile.

The truncated seconds show up here in the display as different speed readings.

DTS shows tenths of a second.


20.0 Seconds = MPH

21.9 seconds =  MPH

22 seconds =  MPH

Truncating the tenths of a second mean more potential error in this shorter distance.

23 seconds ~  MPH (avg.)

24.0 seconds = MPH

25.0 seconds =  MPH

25.9 seconds = MPH

26.9 seconds = MPH

28 seconds =  MPH

29 seconds =  MPH

30 seconds ~  MPH

Unit will beep when out of clocking parameters.


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

the knob needs to be "clicked" from "STPW." towards "Max."

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

The white arrow marks are the limit(s) of travel (MAX) in the above photo.

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.

Here no speed reading is locked: Display says "HLd"

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

The "Hold" button on the remote is pressed again to release the Hold.

The top center button is depressed to "hold" the reading: 56 below.

>> Notice the car display shows "P" (patrol car) and an on-coming vehicle. <<

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


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 a  (pre-measured) distance input:

The FIRST digit can only be a "1" or a "0"

 [YARDS = Distance] x 10.  3 feet = 1 yard = 36".  Similar to a meter = 39"

For example: "50" is what NH uses in their aircraft timing marks = (1,500 ft)

"44" would be a quarter mile = (1,320 ft)

50 x 10 = 500, 500 x 3 = 1,500.  44 x 10 = 440, 440 x 3 = 1,320

Max speed reading is ~185MPH & related to distance.

Maximum distance 1990 or ~1.13 miles (Right knob MUST be on "STPW")

There is no substitute button for the remote.

SQ/UNSQ:  Squelch doppler audio or unsquelch (constant sound)

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

Test display sequence: Thumbwheel setting, 188/88, 32/32

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

or Moving using both displays

DTS:  Digital Time Display.  Since unit display truncates seconds,

this button shows tenths of a second in display in stopwatch ONLY.


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

Turn from "OFF" towards "VOL" 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.

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

(unless the SQ: Sequelch button is depressed below)

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 BRIEF diagnostic start up procedure.


In stopwatch different speeds can be shown with similar displayed times as

the unit truncates seconds unless DTS is depressed after reading is locked in.


This radar unit has less features than the HR-11, but some of the previous features were outlawed.


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 23 - 35 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. 

Granted this is two units in the correct frequency in stationary mode. (Not moving)

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.

Here our unit is bench tested to check KPH to MPH modifications.

This is internally a jumper setting or a wire "snip".

This particular tuning fork is actually an X band 30 MPH.

It reads 13 - 14 MPH on every K band gun I own (3)

However, the manufacturer recommends a tuning

fork specifically supplied by the manufacturer.

Here the unit is activated (transmitting radar) and this vibrating

tuning fork is placed in front of the receiver.

Not the speed I was expecting (13 - 14) Four different forks read correctly.

This fork when struck well produced the 26 reading 20+ times

and had (2) 39 MPH overtone readings.

Improper fork placement (moving it in and out)

could increase or decrease the speed up to 2 MPH.


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

Timer / Distance:    1/4 mile = 1320 feet (44 yards) x 10 OR -440-

NH aircraft timing marks = 1500 feet or (150) on the distance thumb wheel

1/2 mile = 2640 feet (88)

1 mile = 5280 feet (176)

These units have 5 digits in their serial number.  This unit is # 35758.

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

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

Kustom H.A.W.K. operates on K band radar is 24.150 Ghz frequency.

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

** VASCAR uses distance and time to obtain speed.  Distance is via the speedometer.

H.A.W.K Field Certification reference:


The previous generation (arguably) of this unit is the Kustom HR-11

Capable of statistics and more..............

See it here