TX Digicast VLP-DR1, Руководство пользователя, Страница: 6 / 11

Page 6
CT100 cable is highly recommended. It is vitally important that the cable used is very well
screened. CT100 cable is specified as it has a near 100% screen and is low loss (9dB/100m
@ 200MHz). Contract grade “Low loss TV Coax” without a foil screen must NOT be used.
The supplied ‘F’-Type screw on connector is suitable for CT100. Other types can be supplied
upon request. If you use other types of cable or connectors, please ensure they have a good
shielding characteristic.
Ensure that the input coaxial cable is not routed in close proximity to Very Low Power
DAB/DMB Repeater Antenna. Keep it as far away as possible.
If using the external Magnetic Mount Antenna option, ensure that input coaxial cable does
not cross over the output cable. Under no circumstance should they be tied together using
cable ties, or similar.
Where an existing distribution system provides a DAB signal from an external antenna, this
can often be used, otherwise a dedicated directional 4-Element DAB Receive Yagi antenna
(for example Antiference Model DAB2304, or similar) is recommended for reception.
The receiving antenna should be installed with the following points complied with:
 The external DAB Receive Antenna should be pointed at the most appropriate
transmitter site designed to serve the local area.
 The external DAB Receive Antenna should be mounted vertically with cable entering
from below
 The rear reflector element of the DAB Receive Antenna must be orientated towards
the shop floor area where the Very Low Power DAB/DMB Repeater is located.
 The external DAB Receive Antenna should be roof or wall mounted and as far as
possible from the area in which the Very Low Power DAB/DMB Repeater radiates.
 Try to use no more than 50m of CT100 (or better type) cable if possible.
WARNING!
IT IS ABSOLUTELY CRITICAL THAT THESE INSTRUCTIONS ARE FULLY COMPLIED
WITH, OR ELSE THE VERY LOW POWER DAB/DMB REPEATER WILL RECEIVE ITS
OWN OUTPUT (FEEDBACK) AND BECOME UNSTABLE. IT WILL AUTOMATICALLY
REDUCE ITS OUTPUT IN AN ATTEMPT TO CORRECT THE FEEDBACK OSCILLATION
AND TO PREVENT POSSIBLE INTERFERENCE RISK, BUT IT WILL NOT FUNCTION
PROPERLY UNTIL THE FEEDBACK PATH IS CORRECTED.