Service manual

Installation

DCB, DCFCB and DCFCTB Models

D. Return to the dimensions shown in table 1 if there is any trouble achieving a

good match. If the element dimensions are incorrect for the frequency being

used, low VSWR may be unattainable. If the VSWR specification is still

unattainable, replace the cable (A simple ohm meter check of the cable does

not guarantee that the antenna cable is good, due to the DMM not having the

ability to check the cable at high frequencies. If that does not take care of the

problem, replace the antenna.

Mount Yagi Antenna

Refer to Figure 14 Yagi Antenna Installation Example.

1. Install antenna, (using installation bracket or equivalent) as high as possible, such

that the antenna cable and obstacles allows, and install on side of pole closest to

the receiving station. Aim antenna at receiving station.

Note: Objects around the antenna affects the antenna, keep antenna pointed

away from objects.

2. Ensure antenna cable connections are tight. Seal all connection points with heat

shrink or tape and seal with Scotch Coat, or equivalent.

3. Apply RF power to the antenna at the transmit frequency to be used at that

antenna, and check the VSWR (Reflected power). Reflected power must be less

than 10% of the forward power.

If the VSWR specification is unattainable, replace the cable (a simple ohm meter

check of the cable does not guarantee that the antenna cable is good, due to the

DMM not having the ability to check the cable at high frequencies). If that does

not take care of the problem, replace the antenna.

Omni Fiberglass Antenna Models: (no tuning required)

Refer to Figure 15 Omni Antenna Installation Example.