User's Manual

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1.6 THE BATTERIES.
Power is supplied from two 1.5 volt type AA batteries, accessible beneath a
slide-out door on the back side of the transmitter. These batteries should be
replaced when required by conditions described in section 1.3 above. In order to
prevent the possibility of damage due to battery leakage, the batteries should
always be removed when the transmitter is to be stored for a prolonged period.
Damage due to battery leakage is not covered under the warranty.
Be sure to observe proper battery polarity as marked inside the battery
compartment, as it is possible to install the batteries backwards, and this could
damage the transmitter, voiding the warranty.
The transmitter turns off its power automatically after 45 minutes of inactivity in
order to prevent accidental depletion of its batteries while in storage.
2.0 RADIO INTERFERENCE REDUCTION.
For obvious safety reasons, Holatron's top design goal is to ensure that data
communication errors due to radio interference or to insufficient signal strength
due to low battery, exceeding specified range, or conductive objects in the signal
path will result in failure of intentional actuation rather than unintended actuation.
This goal is achieved by transmitting a 64 bit noise-tolerant code repeatedly
while a transmitter button is depressed. 60 of these bits must match the pattern
expected by the receiver. Thus, there is one chance in (2 to the 60
th
power) of an
actuation occurring due to reception of a random signal. Expressed in decimal
numbers, this is (1.1529 times 10 to the 18
th
power, or 11529 followed by 14
zeroes). This is a probability of 8.6736 times 10 to the -19
th
power (or a decimal
point followed by 18 zeroes followed by 86736). Though this probability of
unintended actuation is extremely small, it cannot be guaranteed to be zero.
Therefore, it is important that the user not arm the receiver until all persons
who might be harmed by accidental actuation are in a safe area.
Additional protection is offered by use of 315 MHz as the operating frequency.
This frequency is sparsely used only by low power transmitters with a maximum
range of approximately 100 yards. It is not commonly used by auto security
systems, modern garage door openers, radio control models, cordless or cellular
telephones, wireless microphones, or two way communications equipment.
Because this system operates in the UHF region, interference from lamp
dimmers, electrical discharges, and other natural sources is also minimal.
No instances of unexpected actuation with this communications technology have
been reported to date, but the user must consider that radio is a shared medium.
It is very important to know what other wireless devices are operating in the
vicinity of this equipment. Interference from non-Holatron equipment can result in
diminished range or failure-to-fire, and interference from other Holatron
devices operating on the same channel and with the same system code
can result in unexpected actuation. To be protected from this possibility, the
user must purchase a proprietary system code from Holatron when ordering.