VARIZOOM VZ-WFF Instruction Manual - page 9
Other Things to Know
Interference from Video Transmitters:
UHF video
transmitters, such as the Modulus 2000 or 3000, tend to broadcast
on other frequencies than the intended frequency. This can block
the signal from reaching the Receiver/Amplifier. There are several
things you can do to prevent this from being a problem:
1. Never use any channel above 50 UHF for transmission.
The lower the channel the lesser the chance of
interference. Channels below 40 generally do not interfere
at all unless the video transmitter is inches away from the
antenna on Receiver/Amplifier.
2. Use the highest channel on the WFF that is interference
free.
3. Keep as much metal (such as the camera body) between
the Video transmitter and the WFF Receiver/Amplifier.
4. Keep the video transmitter antenna and cables as far away
from the WFF antenna and cables as possible.
Motor Driver Shutdown:
In order to save power, reduce heat
generation and prevent motor “jumping” due to stray RF
interference, the Receiver/Amplifier turns off the motor driver
circuitry 0.5 seconds after the motor reaches its desired position.
After 3 seconds of trying unsuccessfully to reach the desired
position, the motor will be turned off to prevent damage to the
motor or WFF unit. Changing the position of the control knob on
the transmitter reactivates the motor driver circuitry and resets the
timer.
Battery Saver:
When the Transmitter has not been used for more
than 8 minutes the RF transmitter is turned off.
pg. 16
DATA OUT
Connector: This 3-pin connector is provided to allow
direct connection of the Transmitter and the
Receiver/Amplifier unit. When connected, the
RF sections in both the transmitter and
receiver are switched off and the serial data is
sent via a cable. Pin 1 is ground, pin 2 is the
RF shutdown line that must be connected to
pin 1 in the cable, and pin 3 is the serial data
output line.
Transmitter Battery
The Transmitter is powered by a standard 9V battery that is
inserted through the bottom plate. An alkaline 9V battery will
provide 18 hours of operation. The battery is inserted with the
negative contact near the power connector.
Inserting the battery
backwards will have no effect, the unit simply will not operate.
The Receiver/Amplifier
The Receiver/Amplifier unit is a small, lightweight unit that is placed
near the lens being controlled. It receives the signal from the
Transmitter and drives the lens drive motor proportionally to the
movement of the Control Knob. It also has a relay that can be
used to control the run/stop function of film & video cameras. The
unit has a toggle switch for power, a rotary switch for channel
selection, a 3-position toggle switch and two barrel-shaped thumb
wheels for calibrating the lens drive motor’s range of travel to the
desired range of lens travel, one LED and six connectors.
pg. 9