Procom MHU 3-SM User Manual

Page 2

INSTALLATION STEP

Do not use sealer on rubber gasket or other places.

PLEASE NOTE

With this type of combination antenna only certain frequencies from the

segments 140 – 170 MHz and 410 – 490 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-SM 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 adjustment disc, 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

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

from the curves in the shaded area.

PROCOM A/S reserve the right to amend specifications

without prior notice.
01/12/11