DuraTrax’s Frequency Checker is designed to scan all thirty
R/C frequencies in the 75MHz band and identify when another
transmitter is operating on any such channel. It’s important
to note that the Frequency Checker is NOT well suited to
show very brief, intermittent Rf signals that could cause
interference which may be present in the environment
near or between R/C channels.
Input voltage:
4.5V DC
Operational current:
20 - 90mA
Frequency identifiers:
30 individual red LEDs
Scan frequency:
9 seconds
Max. operational temp:
32-104°F (0-40°C)
Dimensions:
3.14"x.94"x2.36" (80x24x60mm)
Weight:
2.05 oz. (58g)
• Each frequency is identified by its own dedicated LED
• No programming or adjustments, for ease of use–
automatically scans all frequencies when power is applied
• Requires 3 “AAA” alkaline cells (not included)
• Range is up to 300 feet w/o external antenna
• Range is up to 1000 feet with external antenna, available
separately (DTXP3111)
• Small and lightweight, easily fits in a pocket or pit box
• Do not fly on a frequency that is already in use! Failure to
obey this warning can and likely will result in crashed models.
• Always test your radio system before use by performing a
complete range check to make sure there is a solid Rf link
between the transmitter and receiver. Refer to your radio’s
instruction manual for further details.
• Do not allow fuel or oil to make contact with the Frequency
Checker’s plastic case, as it could result in damage to the
case or the artwork.
• Do not store the frequency checker in extreme heat (exceeding
104°F) or cold (below -14°F), in direct sunlight, in high humidity,
in high vibration environments or in dusty areas.
• Do not point a Tx antenna directly at the Frequency Checker.
This will make it more difficult for the checker to detect the
signal being emitted from the Tx.
• For best reception do not lay the Frequency Checker on the
ground during operation. Resting the checker on an elevated
surface such as a table or pit box is recommended.
The 75MHz Frequency Checker requires
3 “AAA” sized alkaline batteries. Looking
at the rear of the Frequency Checker,
press the tab on the battery door, then
gently remove the door. Pay close
attention to insert the cells in the proper
direction as shown here. Re-install the
door after all batteries are installed. If the
condition of the batteries is in doubt,
install fresh batteries for optimum
performance before use.
ON/OFF SWITCH
The input power switch is located along the right side of the
Frequency Checker. Slide the switch to the upper position to
turn the unit on. Move the switch to the lower position to turn
the unit off. Make sure to turn the power switch off when not in
use to prevent draining the batteries.
LEDS
Each of the 30 channels in the 75MHz band is represented on
the Frequency Checker by its own dedicated red LED. The
Frequency Checker scans all frequencies in the band one-by-
one. This device does NOT scan all frequencies instantaneously.
When the power switch is turned on, the Checker begins the
scan starting at channel 61 (75.410MHz) as indicated by a
brief flash of the LED marked “61”, then steps to channel 62
(75.430MHz), etc. until it reaches channel 90 (75.990MHz),
after which time it will start over again at channel 61. It takes
approximately 9 seconds for the Frequency Checker to scan
through all 30 frequencies. The Checker will continue this
scanning process until the power switch is turned off.
When the Frequency Checker identifies that a frequency is in
use, the LED for that particular channel will stay on. This
means it is not safe to use that respective channel! The
Checker will then continue to scan the next channels in order,
LED
ON/OFF
SWITCH
OPERATION
INSTALLING BATTERIES
IMPORTANT PRECAUTIONS
SPECIAL FEATURES
SPECIFICATIONS
INTRODUCTION
75MHz INSTRUCTIONS
®
