WADE Antenna, Inc. PB-81 User manual

Printed in Canada Page 1
The PB-81 Parabeam UHF parabolic screen reflector antenna is of modular design for use
singly or in dual arrays and offers very high gain with extremely low windloading. It is supplied with
the necessary installation hardware. Output terminal is a 75-ohm threaded “F” type fitting.
Model : PB-81 Instruction Sheet
PB-81 screen reflectors are shipped in two sections and must be assembled prior to mounting
the feed assembly. The entire antenna assembly is then raised into position, oriented and secured
to the mast or tower leg as shown in Figure 1 and overview drawing on page 4.
Overview
Materials and tools required
Mechanical Specifications
MODEL REFLECTOR DIMENSIONS(IN.) THRUST**
SIZE(FT) QTY WIDTH HEIGHT DEPTH* NOICE 1/4” ICE NET SHIPPING
PB-81 8.0 1 99.5 96.5 18.0 389 805 100 155
WEIGHT
*Depth for reflector only
**Thrust in pounds transferred to supporting structure at 30 PSF
1. An appropriate 75-ohm downlead equipped with a 75-ohm female “F” type connector and a
weatherboot.
2. Weatherproofing compound.
3. A ratchet wrench with 7/16 and 9/16 inch sockets.
4. A 7/16 open-end wrench
Instruction Sheet
30569-002 Rev. E
09/04/08
Please Note: A qualified structural engineer
should be consulted prior to mounting an
antenna on a tower or support structure.
Figure 1
Delhi Antenna Products Division

 4 - Bolts, 1/2” - 13 x1-1/2”
Hex Head
 4- Nut, 1/2”-13 GR. 2 HEX
 4- Lockwashers, 1/2” split
 4 - Nuts, 3/8 - 16 Hex
 4 - Lockwashers, 3/8” Split
 4 - Washers, 3/8” Flat
 2 - U-bolts, 3/8 Inch
 2 - U-bolts, 5/16 Inch
 4- Nuts, 5/16 Hex
 4 - Lockwashers, 5/16” Split
 4 - Reinforcing Channel
 2 - Mast Clamps
Printed in Canada
Swing the frame open,
assemble it using 3/8 - 16 x 1-
1/2 hex head bolts and mount it
to the PB-81 screen frame using
the supplied U-bolts, mast
clamps and reinforcing clips as
shown in Figure 3 and overview
drawing on page 4.
Open hardware package #1. This should consist of a minimum of:
Screen Assembly
Use this hardware to
assemble antenna halves
as shown in Figure 2.
Refer to detail at right.
Figure 2
 8 - Bolts, 1/4 - 20 x 3 1/2” Hex
Head
 8 - Nuts, 1/4 - 20 Hex
 8 - Lockwashers, 1/4” Split
 16 - Reinforcing Channels
Locate the outrigger frame and hardware package #2. This should consist of a minimum of:
Outrigger Assembly
Frame Array
Figure 3
Page 2

Printed in Canada
Attach the feed to the center of the screen using the 1/4 - 20 x 3 1/2” bolts, flat washers,
lockwashers and nuts as shown in Figure 4 and Detail B. Proceed by attaching the feed
tube to upright vertical member of the outrigger frame using the 5/16” U-Bolt,
lockwashers, nuts, reinforcing channel and mast clamp as shown in Figure 1 and
overview drawing on page 4. Note that the output connector must be installed in the
“up” position and that the feed must be aligned straight out from the screen,
perpendicular to the frame. Connect the down-lead fitting to the antenna output terminal.
Hand tighten, then wrench tighten the fitting not more than 1/6 of a turn. Apply a liberal
coating of weatherproofing compound to the connection and slide on the weatherboot.
Locate driver and hardware package #3. This should consist of a minimum of:
 2 - Bolt, 1/4 - 20 x 3
1/2” Hex Head
 2 - Nut, 1/4 - 20 Hex
 2 - Lockwasher, 1/4”
Split
 2 - Washer, 1/4 Flat
 1 - U-Bolt, 5/16 x 2”
I.D.
 2 - Nut, 5/16 Hex
 2 - Lockwasher,
5/16” Split
 2 - Reinforcing
Channel
 1 - Mast Clamp
Feed Assembly
Page 3
Figure 4
Figure 4, A
Figure 4, B
Figure 4, C

1) Carefully lift the antenna
assembly into position on the
tower or mast, roughly aligned to
the direction of the desired
broadcasting stations.
Temporarily secure the unit as
shown at right and tightening
them sufficiently to bear the
weight of the antenna.
Caution! Take care not to damage
the feed assembly or move it out of
alignment with the center of the
reflector.
 4 - Bolts, 1/4-20 x 3/4”
 4– Nuts, 1/4-20 x 3/4”
 2 - U-Bolts, 3/8-16
 4 - Washers, 3/8 Flat
 4 - Lockwashers, 3/8 Split
 4 - Nuts, 3/8 Hex
Locate hardware package #4. This should
consist of a minimum of:
Antenna Mounting
Page 4
Overview Drawing
Printed in Canada

Printed in Canada
2) Assemble the twist-lock azimuth
braces onto the reflector frame following
steps 1,2 & 3 at right by aligning open
portion of end bracket with antenna
frame, sliding bracket over antenna frame
and turning 1/4 turn counterclockwise to
lock bracket on frame.
3) Locate azimuth brace mount (Figure
5), The 3/8 U-bolts supplied are
adaptable to range of appropriate tower
leg sizes. mount to tower leg as in Figure
1 and overview drawing on page 4.
Rotate the entire antenna slightly, both
left and right, until maximum signal
strength is received. This is obtained by
sliding the azimuth braces in their
attachment hardware (Figure 5). Two (2)
1/4-20 x 3/4” bolts are used to lock the
azimuth brace in place, and two (2) 1/4-
20 nuts are used as lock nuts to lock the
bolts (not shown in picture). When
alignment is When alignment is
satisfactory, tighten all bolts and U-bolts
securely.
4) Connect the down-lead fitting to the
antenna output terminal. Hand tighten,
then wrench tighten the fitting not more
than 1/6 of a turn. Apply a liberal coating
of weatherproofing compound to the
connection and slide the weatherboot on.
Utilize the remaining zip ties to secure
STEP 1
STEP 3
STEP 2
Figure 5
Page 5
1.N
2.D
2.C
Antenna Mounting - continued
Ontario, CANADA
www.wade-antenna.com