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video cameras. The resistors provide automatic current
limiting and un-equal resistor values can be used for
different forward and reverse speeds. Experimentation is
required but for a 12V battery bridge resistors should be
greater than 15 ohms; 24V battery - 30 ohms. Put a
MOV across the motor brushes.
To maintain satisfactory R/C operation select quality
motors whose RFI qualities are known from past R/C
applications. Some situations may require RF chokes in
series. Don't use toy motors with metal brushes or
automobile-type horns because these devices generate
horrific RFInterference.
Relays may be used to amplify the current capacity or
provide handy operating logic such as reversing high
current motors. Use MOVs across their contacts to
minimize RFI as well as in parallel across the coil for
spike suppression. Additional MOVs are available from
VANTEC or Radio Shack. Use AC types rated for 30-50
volts such as Panasonic ERZ-V05D390
Figure 3 shows efficient operation of reversing motors
up to 5 amps using a single 5 amp relay and 5 amp diode
from Radio Shack. If your application runs into a
physical stop use the limit switches shown to prevent
dangerous stalled motor operation. For limit switch
installations you can have automatic reverse/return by
connecting wire "REV" to ground instead of a Receptor
output, omit diode, (saves a KeyKoder channel too).
Don't forget the MOVs.
Figure 4 shows the use of relays to operate much larger
motors, over 4 amps. In this circuit the limit switches
need only be capable of handling the relay coil current.
vantec.com Phone:(541)471-7135 FAX:(541)474-3987 460 Honeycutt Dr., Grants Pass, OR 97526
.
Use MOVs.
If the Receptor fails to receive KeyPad signals it uses the
old information for a brief time and then enters a fail safe
mode. In the fail safe mode all electronic switches are
turned off except KCh14 & 15 which maintain their last
state. You could use KCh14 to command lighting since
your vehicle could be at rest but illuminated with the
transmitter turned off; great for preventing runway
collisions at night or dinner flotillas.
KH16R and KH32R Receptor power wiring is through
the 18 station plug-in terminal block. The ground circuit
which supports these electronic switches-to-ground must
be substantial since all the current for all of your loads
passes through it; up to 5 Amps for each one. Use a
suitable gauge for the ground wire to support your switch
loads; AWG#16 for the full capacity. The ideal power
supply for the unit is +12VDC connected to the +
terminal of the terminal block .+.
range on the + terminal may by 4.8-30VDC. When
power is not supplied to the + terminal block then power
and ground for the Receptor will be derived
automatically from the 4.8VDC power input for the
Hitchiker
"J" style connector; the 9th one labeled "Bat".
This is less desirable due to increased current drain.
Power may be supplied to both the terminal block + and
"J" style. The "J" style +4.8 will run the servos and the
terminal block + will power the internal circuitry.
KH716
or
KH732
transmitter antenna fully. Interference from regular
servo data sent by other PCM1024, AM or FM
transmitters on your frequency, although guarded
The power input
OPERATION:
Extend
0410
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