3: Operation
PRC1099A-MSOP
3-5
Accessory
Connector
The Accessory connector provides the ability to create a variety system
configurations for the PRC1099A such as the MT-1099A mobile mount for
vehicular installations.
Note:
Keep the cap on the accessory connector when it is not in use.
Power
Connector
The bottom power connector is revealed when the battery case is removed.
Rechargeable batteries are recharged through this connector.
Tuning the Antenna
The antenna tuning procedure is fully automatic. It operates only when a
support or long wire adapter is installed.
1. Activate tuning by momentarily pressing
W
HIP
T
UNE
. Do not hold the
button down.
A tone is present in the handset during the tune cycle. A pulsed tone at the
end of the tune cycle indicates the tuner is unable to match the antenna.
With a match, the tuning information is stored in memory and is
automatically selected when the channel is changed.
2. Because antenna tuning varies considerably based on the position and
location of the transceiver, update tune information frequently and always
retune the antenna if communications are unsatisfactory.
Jamming
Jamming is the intentional transmission of signals to prevent communications.
Strong unidentified transmissions can be enemy jamming. Unusual noises on
the channel can also be jamming or interference from a local noise source. It is
also possible for a faulty receiver to cause internal interference to the received
signal.
Identifying
Make the following checks.
1. Remove the antenna. If the noise continues, there is a fault in the receiver.
2. Switch to several different channels. If interference is present on all
channels, it is probably caused by a local noise source. If the jammer is
located at a considerable distance, propagation conditions can mean that
it is not possible to jam on all frequencies.
Anti-Jamming
When you first detect jamming, try the following solutions.
•
Operate at low power if satisfactory communications can be achieved.
This makes it difficult for the jamming source to intercept the
transmissions and determine the jamming frequency.