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アンテナ Diamond Antenna CR8900AのPDF インストラクションシートをオンラインで閲覧またはダウンロードできます。Diamond Antenna CR8900A 2 ページ。 10m/6m/2m/70cm fm mobile antenna optimized for trunk lid mounting
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Check VSWR on 6 meters first. Loosen set-screws (020907) on base coil (020906) to raise or lower center frequency. Upon
reaching accepted VSWR on 6m &2m, tighten set-screws (020907). Tune
````````` 10m by adjusting the tuning whip (020901). Raising the tuning whip (020901) will effect both 6m and 10m center
frequency. It is best to tune the 6m band first to reach optimum center frequency, then proceed to adjust for 10m optimum
center frequency. Tune until satisfactory VSWR is obtained at both 6m and 10m center frequency. Verify setting results in
best fit for each band. Tighten set screw (020908) using removable Loctite Threadlocker #242 or similar product to insure
proper fastening of setscrews and whip section.
Should you have difficulty in tuning the 10m & 6m bands, the cause would be most likely attributed to
grounding characteristics of the vehicle trunk lid. It is sometimes necessary to add short grounding
straps or copper braid from trunk lid to body panel (to lower resonant frequency).
Typical VSWR curves for
CR8900A with Diamond K400S Trunk Mount
You may expect your results to vary somewhat, depending
upon mount used, and individual grounding characteristics
of trunk lid, etc.
ANTENNA TUNING:
→
Adjust for best
VSWR at
52.5 MHz
& 146 MHz
(10 meters)