8
BATTERY INSTALLATION
The transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY ALKALINE or
LITHIUM batteries for reliable operation. Alkaline batteries will provide about 4 hours of operation while the lithium
batteries will operate the transmitter for over 12 hours. The battery status lamp will function normally only with alkaline
or lithium batteries. Standard zinc-carbon batteries marked “heavy duty” or “long-lasting” are not adequate. They will
provide only about 30 minutes of operation. Similarly, nicad rechargeable batteries only provide about 1 hour of
operation, and will run down quite abruptly.
The battery compartment is located in the lower section of the transmitter, between two printed circuit boards. To
install a fresh battery, follow the steps illustrated below.
STEP 1
STEP 3
Remove
Cover
STEP 4
STEP 6
STEP 5
Rotate Ring To
Lock Closed
P
A
STEP 2
Rotate Ring
1/8 Turn
P
A
+
–
Insert
Battery
Replace
Cover
+
–
Alternate Method
Depress the plunger with the
corner of the battery and slide the
battery into the compartment. Note
that the locking ring is in the closed
position for this procedure.
Ring will sit flush in the
closed position.
Pull Ring
Outward
Look inside the battery compartment when the cover is off and take note of the two differently sized holes in the
battery contact pad. Insert the battery so that the large hole in the battery contact pad will line up with the large
contact on the battery when it is installed. The spring-loaded plunger in the bottom of the compartment (opposite the
contact pad) secures the battery in place.
The battery status is indicated by an LED on the bottom panel. The LED will glow brightly when the battery is good
and will dim as the battery condition deteriorates. The LED is at full brightness with a new battery. (Be sure this LED is
enabled with the EXT LED switch in the battery compartment. The battery status is also displayed on the Information
Display on the front panel of the UDR200B Receiver. See the UDR200B manual for further details.
Note: It is possible to insert the battery backwards and still be able to close the battery door. No damage will occur but
the transmitter will not operate in this condition.
