CB Fiberglass Whip Antenna
(210-0974)                 Tuning the Antenna         Faxback Doc. # 38613


Replacement for Radio Shack Single Truck or Tunable Fiber Glass
Mirror-Mount CB Antenna (21-973).

Tunable for best performance

Standard " 24-thread connector

The Radio Shack Mobile CB Antenna Tunable Fiber Glass Whip is a
replacement for the whip from the Single Trucker Tunable Fibre Glass
Mirror-Mount CB Antenna (21-973).  Simply unscrew the old whip from the
antenna's whip adapter, and thread the new one in its place, using the
existing lockwasher.

TUNING THE ANTENNA

For the best results, properly tune your antenna using an SWT
(Standing wave radio) meter after you install the new whip.  Your local
Radio Shack store has a selection of SWR meters and other CB accessories.

1.  Connect the SWR meter between your CB and the antenna cable, as
    described in the meter's instructions.

2.  Measure the SWR on your CB's lowest and highest channels.

    If the reading on the lowest channel is higher than the value in the
    chart, loosen the adjusting collar (1) and lower the whip ( ) inch in
    the compression ferrule (2).  While holding the whip in this position,
    retighten the adjusting collar.

    If the reading on the highest channel is higher than the value in the
    chart, loosen the adjusting collar (1) and raise the whip () inch in
    the compression ferrule (2).  While holding the whip in this position,
    retighten the adjusting collar.

3.  Measure the SWR again and repeat the adjustment, if necessary.  Adjust
    the antenna in small increments, checking the SWR each time.

(br/km-03/27/1997)

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