4101-2 Controller Installation Handbook
19-4
Checking the antennas using the 922 Test Card
Use a 922 Test Card to check the transmit (Tx) range at the antenna.
Bring the Test Card towards the antenna until the LED in the Test
Card lights or flickers.
No transmit signal
If there is no Tx signal, the wiring is faulty.
Reduced transmit signal
If there is less Tx range than you would expect, a very common fault
is that the Tx and Rx cables are swapped - this is nearly always the
reason for low Tx range in 280 Reading Heads. Low Tx range in a
loop antenna could be caused by not tuning it correctly with the Loop
Coupler, or by mounting it close to a large metal structure such as a
metal door frame.
Checking the receive range at the antenna
If the Tx range is correct, you must check the receive range, the
distance at which the card can be read. Bring the Test Card towards
the antenna. If the LED in the Test Card flickers, it is inside the
transmit field but is not being read. Bring it closer to the antenna
until the LED in the Test Card lights brightly in long pulses. This
distance is the receive range.
Low receive range on a reading head
If the receive range is very low on a reading head, the connections
must be faulty. It is possible, but unlikely, that the reading head is
broken, or that there is sufficient electical noise around to interfere
with it.
Low receive range on a loop antenna
If the receive range is very low on a loop antenna, this is almost
always caused by noise (interference caused by certain electrical
equipment which is too near the antenna).
Correct Tx and Rx range but card not unlocking door
If both the transmit and receive range are correct but the card is not
unlocking the door, check the lock connections and the power to the
lock. Note: you must not use the VA supply from the reader module
to drive the lock - use the auxilliary power connections from the
Controller or a separate power supply direct to the lock.
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