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Global TSCM Group, Inc.
12 W 32
nd
St, Suite 604, New York, NY 10001, USA
Tel.: +1 212 967 4030 +1 646 233 0383 Fax: +1 212 967 7560
THE STEALTH
The Confidential Catch
DF Calibration
Calibration DF unit will be necessary at the first time or any time you use your KN2C-2020 on a
different vehicle.
It is necessary to recalibrate, if you remove and replace the antennas on your vehicle, and they are
not placed back in precisely the same locations and geometry making.
Installing the antenna unit on the roof of your vehicle
a. Place N on the frontward of car (0 degree)
b. Place S to on the backward of car (180 degree)
c. Place E to on the passenger side of car (90 degree)
d. Place W to on the driver side of car (270 degree)
Optimum spacing of the four array sides is given by the formula D = 2630/F where D is distance
between adjacent whips in inches and F is received frequency in MHz. This distance is not critical,
but use care to place the whips in a perfect square pattern on the roof and align the array sides
parallel to the sides of the vehicle.
It's tedious to set out the magnetic-mount whips using just a ruler or tape measure. I made separate
cardboard templates for optimum 146, 223, and 440 MHz spacing. Cutouts in the template corners
match the whip bases. Emplacement is fast and misalignment is avoided with the templates. Once
the whips are in place, I remove the template so it doesn't get rained on or blow away. Kevin Kelly
N6QAB went a step further and marked the top of his vehicle with whip locations
Preparing Calibration
1. Connect the RF output from the Antenna Control unit to the VHF FM receiver’s antenna
connector
2. Connect the Antenna Control cable between the Antenna Control unit and KN2C-2020’s Main
unit.
3. Connect the FM receiver's external speaker audio to the audio input jack on KN2C-2020 main
unit.
4. Turn on the power to your DF unit.
5. Turn on the receiver and open the squelch on your receiver, then tune it to the frequency
desired.
6. You should hear a 430 Hz tone imposed on any audio present depending on the Antenna
Speed selection at startup.
Calibration
The easiest way to calibrate is to drive your vehicle to an open area and have a friend position
himself/herself at least 100 ~150 feet (30 ~40 m) away with low power and directly ahead of the
vehicle while transmitting an unmodulated carrier.
If your friend is using an HT, ask him/her hold it vertical at approximately the height of the vehicle
antennas. If the DDF already turned on, check which direction the direction LED shows and adjust
