Users Manual Part 7

2. WIRING

2-57

• Destination of Serial cable from the Antenna Unit

Serial cable: TB802 and TB803 through the locking wire saddle (A).

Shield of serial cable: Screw on fixing plate (C)

4. Bind all cables with cable ties supplied locally (two places).

5. Check that armor of cables are lying in their respective cable slots then fasten the

cable clamp.

Flexible waveguide (FR-9)

The RF interconnection between the Antenna Unit and the transceiver can be made

with a flexible waveguide (FR-9). If the rectangular waveguide is used, observe the fol-

lowing installation guidelines.

• Correctly installed waveguide runs ensure the most efficient transmission of electri-

cal energy at high frequencies. Electrical losses, however, occur in the waveguide

runs. To minimize them the following factors are of great importance: minimum

length, airtightness and electrical continuity.

• Another consideration required is that of frequency disturbance. The transmitting

valve, a magnetron, is the primary oscillator in the radar. This is different from the

oscillation system at lower frequencies in which conventional radio valves are used.

In the latter case, the primary oscillator is always protected from the effects of load

impedance by a buffer stage so that frequency and waveform are left unobstructed.

TB803

TB804

TB803

TB802

Cable tie