
Figure 10. P48W transom mount:
Copyright © 2008 Airmar Technology Corp.
To adjust knob:
push, turn, and
release
NOTE:
Knob
corresponds to
shape and position
of beam.
Adjusting the beam’s angle
(0° shown)
P48W: Optional Portable Bracket
An optional Portable Bracket Kit, 33-076-01, is available to
temporarily mount the transducer to different watercraft, ice
fishing apparatus, or a fixed location (see Figure 9). Installation
instructions are included with the bracket.
P48W: In-Hull Mount
CAUTION
: Do not in-hull mount the TM150M as it will over-heat.
Although the performance will be diminished, the transducer can
be adhered directly to a
solid
fiberglass hull—NO CORING.
Instructions are available at airmar.com. Go to Marine Products
>Installation Instructions>In-Hull Transducers and click “P72, P74,
P76” (part number 17-010).
P48W: Operating
About Adjusting the Beam’s Orientation
The transducer transmits an oval shaped beam that can be
adjusted to different angles relative to the boat: 0
°
, 23
°,
45
° ο
r
90
°
. At 0
°
, the widest part of the transducer’s beam is oriented
fore-aft. Likewise, at 90
°
the widest part of the beam is oriented to
port-starboard. Note that the width of the beam will be different at
each beam angle.
To understand when to use each beam angle, see the table below.
Beam
Angle
Fore-Aft
Beam Width
Port-Starboard
Beam Width
Application
0
°
38
°
12
°
Best high-speed bottom detection
Fish appear as large arches
23
°
36
°
18
°
Good high-speed detection
Fish appear as prominent arches
Wider side-to-side beam than at 0
°
45
°
29
°
29
°
Detection similar to conventional
wide-beam transducer
Equal size beam width in both
directions
90
°
12
°
38
°
Maximum detection while boat is
moving forward
Good high-speed bottom detection
Fish arches are not pronounced or
may not be evident
Transom Mount: Adjusting the Beam
NOTE
: The knob corresponds to the shape and position of the
transducer’s beam.
To change the beam’s orientation relative to the boat, grasp the
transducer’s knob, push down, rotate to the desired angle, and
release the knob (see Figure 10).
Check that the transducer is
locked into the angle by sliding your hand along the bottom of the
transducer to be sure it is flush with the housing
.
Trolling Motor or Portable Mount: Adjusting the Beam
NOTE
: The knob corresponds to the shape and position of the
transducer’s beam.
The beam angles are marked on the underside of the trolling housing
(see Figure 11). To change the beam’s orientation, grasp the
transducer and pull outward. Rotate it until the orientation mark is
aligned with the desired angle and release the transducer.
Be sure
the transducer is locked into the angle after the knob is released
.
P48W: Reassembling the Transom Housing
1. Slide the cover over the cable onto the transducer (see Figure 6).
2. While holding the wavy spring over the pocket in the transom
housing, insert the transducer into the pocket. (The spring fits
under the lip of the transducer.) Orient the transducer so the
5
Airmar Part No. 33-076-01
Copyright © 2008 - 2015 Airmar Technology Corp.
Figure 9. P48W Portable Bracket mount
Figure 11. P48W trolling motor mount:
Copyright © 2008 - 2015 Airmar Technology Corp.
top view
bottom view
knob corresponds
beam
orientation
mark
to shape and
position of beam
transducer
angle
Adjusting the beam’s angle
(90° shown)
cover
screw (2)
knob
beam angle
transducer
(6 x 1/2
")
(6 x 1/2
")
trolling
housing
Portable
Bracket