Procom MHU 3-X - Manual (Page 2)

PLEASE NOTE
With this type of combination antenna only certain frequenciesfrom the
segments 140 - 170 MHz and 400 - 480 MHz can be covered at the same
time. The combination area corresponding to “allowable” frequency pairs is
shown in the diagram below. However, taking into account the inherent
bandwidth of the antenna the combination area may be increased
significantly. The antenna can also be delivered factory tuned. Please
consult our price list concerning additional charges for adjustment by
cutting.
TUNING INFORMATION
The MHU 3-X cannot be tuned to any pair of frequencies in the two bands.
Further, the antenna must be equipped with a different kind of adjustment
disc depending on the frequency pair in question. The antenna can be used
without adjustmentdisc, with a small adjustment disc or with a large
adjustment disc. All adjustment disc types are supplied with the antenna.
Use the diagrams below as follows:
1. Draw a horizontal line through the point on the vertical axis which
corresponds to the 2 m-frequency in question.
2. The drawn horizontal line intersects the shaded area over a certain band
of
70 cm-frequencies. If the 70 cm-frequency to be covered is not included in
the shaded area, try another diagram (another adjustment disc type). If the
70 cm-frequency is not covered in any of the diagrams, coverage of the
frequency pair
in question is not possible using this type of antenna. Please note, however,
that taking into account the inherent bandwidth of the antenna (± 2 MHz in
the 2 m-band and ± 12 MHz in the 70 cm-band) the combination area may
be increased considerably.
For the relevant diagram:
3. Read the total length L
1
on the left horizontal axis and cut the whip to this
length.
4. Locate the 70 cm-frequency in question on the right horizontal axis and
read the corresponding length L
2
from the curves in the shaded area.
PROCOM A/S reserve the right to amend specifications
without prior notice.
25/11/11