User's Manual

Broadcast Microwave Services, Inc. – 12367 Crosthwaite Circle – Poway, CA 92064 9
Phone: [phone] - Fax: [phone]
Email: [e-mail] Web: www.bms-inc.com
INSTALLATION
Typical system the 4GHz Carry-Coder II with Power Amplifier is shown in Figure 3.
Figure 3 Typical system of 4GHz Carry-Coder II with Power Amplifier
Mobile and Fixed Platforms
• The system of Figure 3 can demonstrate both mobile and fixed applications. The transmitter part including the Carry-Coder
II Transmitter, Power Amplifier and the video camera are all mounted inside a truck.
• An omni-directional antenna placed on the vehicle roof-top (without any obstruction) transmit uniformly in all azimuth
directions. This allows the mobile transmitter to communicate with the Receive Site while the vehicle is moving freely.
• In the Receive Site the omni-directional antenna on the mast will receive the transmitter signal without any need for
tracking.
• Because of low antenna gain (both on transmit and receive ends) the Power Amplifier will be crucial in order to boost the
transmitter power and ensure the minimum practical range.
• When the Transmitter Unit is stationary (i.e. the vehicle is stalled for a while) then the tracking dish antenna in the Receive
site will be able to track the transmitter and establish a line of site transmission. This is considered a fixed situation and the
high gain of the dish antenna will increase the minimum range. In the fixed platform the transmitter antenna can be
changed from omni to a tracking dish antenna.