9.
TRIMMING THE COIL
For specific frequencies such as for MARS, CAP, FAA and so on where frequencies
near, but not in the amateur band are required, coil trimming may be done to reach
those frequencies. In cases of extreme environment interaction, trimming may be
necessary for proper resonant point.
Before trimming the coil, the antenna must either be properly operating at some point
on the band being used, or you have confirmed the resonant point is lower than where
your operating.
DO NOT TRIM THE COIL PRIOR TO THIS
.
Remove all the tuning hardware and take note of where the resonant point is.
Trimming will be from this point, therefore the tuning hardware could be used for
lowering the resonant point to where desired.
1. Remove the Top Coil Support.
2. Tape the coil securely so the windings will unravel.
3. Clip the eye on the top lead of the coil.
4. Slide the wire back through the two holes in the coil form.
5.
REMOVE 1/2 TURN AT A TIME!
Slip the wire back through the two holes
from the opposite direction. Looking through the hole as the wire comes to you will
help line it up..
6. Reconnect the wire to its original position and trim the excess.
7. Check your resonant point.
If
needed repeat the procedure as many times as
necessary in 1/2 tum increments.
