Airmar P48W Owner'S Manual And Installation Instructions Download Page 5

Page: 5 / 6

Figure 10. P48W transom mount:

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

°,

° ο

. 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

Best high-speed bottom detection
Fish appear as large arches

Good high-speed detection
Fish appear as prominent arches
Wider side-to-side beam than at 0

Detection similar to conventional
wide-beam transducer
Equal size beam width in both
directions

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

Airmar Part No. 33-076-01

Figure 9. P48W Portable Bracket mount

Figure 11. P48W trolling motor mount:

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

trolling

housing

Portable
Bracket

Summary of Contents for P48W

Page 1: ... s P48W Not recommended for stepped transoms because the transducer will be difficult to adjust Vertically orients sound beam on hull with deadrise angle up to 22 Adjusts to transom angles from 2 22 Requires 89mm 3 1 2 of headroom to install Release bracket protects sensor from frontal impact only P48W Trolling Motor Kit adapts transducer for use with a trolling motor or optional Portable Bracket ...

Page 2: ...at may be supported during trailering launching hauling or storage For the best performance the transducer s face must be in contact with smooth water To identify an area of clean water observe the water flow off the transom while the boat is underway Allow headroom space above the bracket for it to release and rotate the sensor upward Mount the sensor as close to the centerline keel of the boat a...

Page 3: ...e the waterline 1 If a hole must be drilled through the transom choose a location well above the waterline see Figure 3 Check for obstructions such as trim tabs pumps or wiring inside the hull Mark the location with a pencil Drill a hole using the appropriate size bit to accommodate the connector 2 Route the cable over or through the transom 3 On the outside of the hull secure the cable against th...

Page 4: ...ectrical wiring and the engine s Coil any excess cable and secure it in place with cable ties to prevent damage 10 Refer to your echosounder owner s manual to connect the sensor to the instrument Checking for Leaks When the boat is placed in the water immediately check for leaks around the screws and any other holes drilled in the hull Note that very small leaks may not be readily observed Do not ...

Page 5: ... 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 desire...

Page 6: ... with sealant 3 Cover the damaged area with electrical tape Severed Cable 1 Slide heat shrink tubing onto the cable 2 Splice each pair of matching colored conductors with rosin core solder 3 Wrap each conductor with insulating tape at the splice 4 Splice the braided shield wire with solder 5 Fill the spliced area in the cable with sealant 6 Cover the damaged area with the heat shrink tubing follow...

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Airmar P48W, Owner'S Manual And Installation Instructions, Page: 5 / 6

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