Congratulations on purchasing your Arrowspeed RADARchron™.
If used and cared-for as described herein, you should enjoy many hours of constructive use. The Arrowspeed RADARchron™ is
a small, inexpensive microwave Doppler radar velocity sensor that measures the speed of a metal or graphite/carbon arrow as it is
propelled from the bow. The purpose of the RADARchron™ is to assist archers in optimizing the performance of their bow and
arrow system by providing immediate velocity data. It is easily attached to compound bows via a Radar Adapter that interfaces
with most stabilizers, or with an extension rod available for mounting to the bow.
Powered by a single cell lithium battery, the RADARchron™ transmission level is well below that of most "wireless"
consumer products such as cellular and portable telephones, for example. Transmission characteristics are well within FCC
requirements and prescribed safety levels. The RADARchron™ is microprocessor controlled, and indicates calculated feet-per-
second arrow speed on a liquid crystal display. The RADARchron™ is packaged in a rugged plastic housing, enclosed to protect
the internal electronics from dust, dirt and moisture encountered during normal use. However, the unit is not hermetically sealed
and is not intended to be immersed in water or exposed to prolonged rain or snow.
The electronics are in the "sleep" mode until activated by depressing the push-button "on" switch. This action applies electrical
power from the battery to the microcontroller and display electronics. The liquid crystal display will indicate the last feet-per-second
velocity reading. Depressing the push-button again will cause the display to show two dashes, indicating that the RADARchron™ is
transmitting. Upon receipt of a velocity signal produced by an arrow propelled from the bow, the arrow speed is calculated and dis-
played. The 2-digit display will first show the "hundreds" digit; then the tens and single digits together. The display will toggle back
and forth from hundreds to the tens and single digits. For example, 275 fps will be displayed as 2, then 75; then 2 again, followed by
75. Receipt of a velocity signal turns-off the radar transmitter until the "on" switch is again depressed. If a velocity signal is not
received within thirty seconds after depressing the "on" switch, electrical power is automatically removed from the radar transmitter
until the switch button is again depressed. Limiting the "on" time of the radar transmitter conserves battery power, maximizing life.
After inactivity of about one minute, battery power is also removed from the display and the electronics go into the "sleep" mode.
USING THE RADARchron™
1. The RADARchron™ is attached to an Adapter plate by a 5/16" x 24 x 1/2" button head socket cap screw which screws into the
threaded hole in the Adapter. The Adapter is then attached by a knob thumb screw to the threaded 5/16" x 24 receptacle in the end
of most stabilizers, or to an Extension Rod provided with the RADARchron™. Three Adapter hole locations are provided to
assure that
the top of the RADARchron™ is located between 1/2" and 1 1/2" below the bottom of the arrow as it passes
over the RADARchron™. The RADARchron™ must be located at least 7" forward of the bow. In some cases, up to 14"
is desireable for maximize accuracy and consistency.
Two Extension Rods can be used, or a combination of Extension Rod and
stabilizer is often preferred. Position the RADARchron™ such that the LCD Display and pushbutton "on" switch are facing the
archer and the label side is directed toward the arrow flight path.
2. Press the large push button "on" switch to energize the display electronics. The display will show the last fps reading.
3. Press the push button "on" switch a second time. Two dashes indicate that the radar is transmitting.
4. The RADARchron™ is now ready for measuring the velocity of a propelled arrow.
5. After the arrow is "shot", read the exit velocity in feet per second as the displays toggles from the hundreds digit to
the tens and single digit speed value.
6. Press the "on" button to turn the transmitter back on for measuring the next shot.
7. If the next shot does not occur within thirty seconds, the power-saving timer will turn off the radar transmitter.
Therefore, when preparing to measure the next shot, again depress the push button "on" switch. Two dashes on the
fps display indicate that the radar is transmitting and ready to record the arrow speed.
8. When speed-measuring activities have ceased, and the RADARchron™ is dormant for about one minute, it
automatically switches into the "sleep" mode, conserving battery power. The display will then be blank until the
above sequence is resumed.
SPECIFICATIONS
Size: Triangular , 2 1/2" w; 3 11/16" lg; 1 3/16" th. Weight: 3 oz.
Display Type: Toggling 2 Segment LCD Speed Units: Feet per second (fps)
Speed Range: 150 to 450 fps Accuracy: ± 2%
5/16"–24 x 5/8"
KNOB THUMB SCREW
ADAPTER
5/16"–24 X 1/2"
BUTTON-HEAD
SOCKET CAP
SCREW
THREADED HOLE
ARROWSPEED
RADARCHRON
™
BOW
7" MINIMUM
STABILIZER OR
EXTENSION ROD
SPLIT RING
LOCK WASHERS
1/2" MINIMUM TO 1 1/2" MAXIMUM
q
FINGER TIGHT ONLY
DO NOT OVERTIGHTEN
