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^/v'NEFTS MANUAL
ALLIANCE HD-73
HEAVY DUTY ROTATOR
FOB DIRECTIONAL PERSONAL COMMUNICATION ANTENWÄS
ALL IAN CE
MANUFACTURING CO. INC.
22790 LAKE PARK BLVD.
ALLIANCE, OHIO 44601
A NORTH AMERICAN PHILIPS COMPANY
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CONGRATULATIONS
You are now the owner of the most recently designed, United States manufactured, antenna rotator for
personal com munications service. Made by Alliance, the makers of the famous Genie Garage Door Opener
Systems, and Tenna-Rotor, TV’s better color getter.
H D - 7 3 CA R TO N C ON TE NT S
1. Own e r 's M a nu al ........................................................................................X- 19 522- C
2. R ot ato r Mo t o r Dri ve U n it .......................................................................W-1 94 00- R
3. Four Ma s t S up p o r t Bracket s.................................................................... Z-1 9 4 05 - B
4. C on tr ol Case ..............................................................................................W-1 95 31 -R
5. Loose H a rd w a re Bag
If short any items, or if there is hidden damage resulting from rough handling in transportation, con
tact your dealer immediately.
Qty.
8
Hex head ma ch in e s cr e w s 5/1 6-1 8 x1 "....................
1 2
Loc k wa s he rs 5/1 6 ” (s p l i t).............................................
8
Flat W as he rs 5/16 ” ...........................................................
4
Hex head ma ch in e s cr e w s 5/1 6-1 8 x 2 V2 "
2
"V " c l a m ps ..............................................................
2
"U " bolts.................................................................
4
Hex n uts 14 " ..............................................................
4
Square head se t s c r e w ...........................................................
4
Lo ck w as h er s % " (split) .......................................................................
2
Cable clam ps 3/1 6 ” (p las ti c ) .................................................................
2
Cable clam ps %" (plast i c)...........................................................
4
Term inal c ov er ...........................................................
2
Self- thr ea din g s c re w #8 x 5 /8 " ........................................
4
Hex head ma ch ine s c re w 5/1 6-1 8 x V2 ” ..................................
1
Flat was h er 9 /6 4 " ...............................................................................
1
Hex n ut 6 -3 2 ..................................................................................
Name and D escrip tio n
.................................................................................. X-1 945 2 - R
CONT ENT S OF H A RD W A RE BAG
................................................X - 59 73 - F
................................................X- 21 28- M
................................................X 8 18 4 A
............................
................................................X- 59 73- M
................................................X - 8 1 00 - E
................................................X- 3 77 0- B
................................................X - 21 28 -N
...................................................X3263 - A
................................................X - 32 63 - B
.............................................X-19419-A
................................................X- 8 62 7- B
................................................X - 59 73 - N
................................................X - 2 71 5-P
...................................................X - 6 0 1 - P
Part No.
FEATURES AND SPECIFICATIONS
The HD-73 rotor incorporates all features that contribute to strength, durability and ease of installa
tion without special tools or equipment as well as simple foolproof operation of the control box.
The HD-73 rotator is constructed of heavy duty aluminum castings selected for their excellent strength
capability and favorable weight characteristic, contributing to ease of erection and resistance to severe
wind and adverse weather conditions that exist throughout the world.
The HD-73 unit is factory lubricated with a lifetime high quality lubricant that will withstand tempera
ture ranges of 120° Fahrenheit to — 20° Fahrenheit.
The HD-73 mast support bracket design permits a centering procedure for in-tower application with
out shims or difficult trial and error adjustments and the base design permits easy four bolt in-tower mount
ing without spacers. The mast support bracket design also provides a positive drive no-slip option.
The HD-73 rotator unit has two full raceways of 100 ball bearings which give it excellent balanced
weight bearing capacity.
The HD-73 has an improved automatic brake action for simplified operating procedure which also re
duces risk of antenna damage by sudden stops imposing high inertia stresses on the antenna, tower and
rotator.
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The i iD-73 has the heaviest pitch gear teeth (steel hardened) of any rotator in its size and price range.
The HD-73 control unit features TWO-SPEED rotation with one five-position switch. This presents a
one revolution per minute speed for rotating over an extended arc and a slower speed for adjustment
of, say, several degrees one way or the other for fine adjustments for the best signal on receiving and
transmitting.
The rotator not only has a readily accessible externally located fuse for total unit protection, it also
has an internally mounted automatic reset thermal protector for the motor and transformer against shorts
or possible connection error or prolonged operation.
A large, back-illuminated 3V2" Weston D’Arsonval, Taut Band, linear, full scale, 90° swing meter is
calibrated in bold S-W-N-E-S as well as a degree-graduated scale.
I he meter direction indicating voltage supply is solid state voltage regulated for meter indication accu
racy regardless of wide line voltage or load variation; the regulating range is 105 to 129 volts.
The HD-73 rotor was designed to operate antennas with a maximum of 10.7 square feet of wind load
area when properly installed.
Mast mounting size range — 1 %" O.D. to 2 ^ " O.D.
Mounting Option — In tower (preferred), or on tower or mast.
Cable — 6 conductor.
Voltage input — 117 volts A.C., 60 hertz, ±12 volts.
Rotator weight (bare) — 634 lbs.
Rotator with 1 pair antenna brackets — 9% lbs.
Rotator with 2 pair brackets — 1V /2 ibs.
Shipping weight — 17 Ibs.
Rotator speed — Dual — 1 R.P.M. and a pinpoint slower speed.
Motor — capacitor split phase, reversible. Motor voltage — 20 volts A.C. No voltage on motor or leads ex
ceeds U.L. safety limits.
Transformer, power — Double protected — fuse and thermal protectors.
Meter — D.C. D’Arsonval, taut band. Meter scale — S.W.N.E.S. and degree scale.
WIND LOAD INFORMATION
Severe installation and duty requirements are placed upon antenna rotators and supports by communi
cation antenna arrays. The factors involved in such installations have been under investigation for many
years to determine the effect of such requirements on antenna rotators, and how to design and manufacture
rotators that will support and operate antennas under the very adverse conditions that exist in some locali
ties. These locations are not only those of high wind velocity but also those of additional ice loading and
severe conditions that exist during periods of blizzard and peak gusts of wind that occur in many areas.
The United States Weather Bureau furnished fastest mile per hour velocity figures from many record
ing stations around the United States. Measurements have been made of the relationship of gusts for
fastest miles per hour data by the Bureau showing that gusts exceed fastest wind velocity data qenerally
by 30%.
As a result of the above, the Electronic Industry Association (EIA) has recommended a wind loading
standard of 30#/sq. ft. of projected surface for the purpose of design by United States manufacturers.
This corresponds to a wind velocity of 110 mph. The use of this standard in design procedures will con
sistently yield products better able to withstand successfully most prevailing wind conditions in U.S.A.
This brings us to the subject of Bending Moment, also called Side Thrust Overturning. Wind loading or
wind pressure acting on an antenna, rotator and tower are essentially the same as those acting on build
ings, water towers and other structures. Wind loading is by far the most critical and severe item to be con
sidered for antennas, rotators and tower life. A typical 3 element vertical C.B. antenna creates a bending
moment of 1700 lb. ft. and necessitates in-tower mounting. Other C.B. antennas are vertically polarized and
can exceed these values.
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^ When considering the extreme wind loads against the antenna which in turn is supported by the rotator,
it is necessary to give consideration to the bending moment and to mount the antenna (boom) as ciose to
the rotator as possible (12" is desirable) or by mounting the rotator on a plate within the tower legs or
structure about three to four feet down from the top tower sleeve. The drive shaft on a mast stub is free to
lOtate through this sieeve or bearing at the top of the tower. This gives the most favorable condition for
the rotator to withstand the severe bending moment to which your antenna installation might be exposed.
An example, if top of tower installation is used and the antenna boom is mounted one foot above the rotator,
the wind pressure against the antenna could result in a bending moment of 300 pound-feet. If the same
wind condition existed and the antenna was mounted 2 feet above the rotator, the bending moment would
be twice as great at the rotator or 600 pound-feet, or, 1200 pound-feet at four feet above the rotator. Thus,
it is important to keep the antenna boom as close as practical to the rotator if mounted on top of tower.
Better yet, consider mounting the rotator in-tower.
GROUNDING, LIGHTNING, AND POWER LINE SAFETY CONSIDERATIONS
Antenna masts, tower, lightning arresters, antenna discharge units, cable shields and other devices
associated with radio equipment should be attached to an “ effective” ground. (An effective ground is one
which is in com pliance with NEC Article 800-31 and 810-26).
To obtain maximum lightning protection for an antenna system we suggest that the antenna tower or
mast be connected using a heavy gauge copper wire to an extremely low impedance path to earth ground.
A low impedance ground may be obtained by driving a continuous rod approximately 5/ s" in diameter a
minimum of eight feet into the earth or by connecting to a continuous, metallic underground water piping
system, or a combination of both. A properly grounded antenna system (low impedance path to earth) will
minimize the possibility of serious damage due to a direct stroke of lightning and the equalization of the
difference in potential between the antenna system and storm clouds will be improved.
WARNING
Lightning is not the only electrical consideration you must make. You must realize that the 120/240
volt line run into your home as well as the 7,200 volt line run by your utility company to the transformer in
your immediate neighborhood are lethal voltages and must not be contacted by your antenna, tower, mast
guy wires, coaxial cable or 6 conductor cable under any condition. Ali construction must be undertaken
with a 100% safe plan before it starts.
The United States Consumer Product Safety Commission (CPSC for short) says that according to their
records and statistics CB radio operators are killing themselves at an increasing and alarming rate by acci
dentally running their base station antennas, masts and towers into nearby high voltage power lines.
DETAILED INSTALLATION PROCEDURE
Tools suggested:
Screwdrivers, Vs" blade and VA" blade
Pen knife
Open end wrench,
Open end wrench or box wrench,
Open end wrench or box wrench, 3^"
Soldering iron
Solder, resin core
Cable Purchase:
Procure one appropriate length of cable to reach from the top of your tower or mast to your operating
location.
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Cable to be six conductor, each conductor to
IMPORTANT
be insulated with a different color insulation
and with an ouier vinyl jacket. The conductor
should be #20 (AWG) stranded, which is
ample size for a length up to 125 feet. See
chart at right for other lengths and cable
gauges.
AVAILABLE CABLES
Alpha #18 96/6 ................................................................................................. 6 conductors #20 ga.
Alpha #1176.....................................................................................................6 conductors #22 ga.
Alpha #1 898 /6.................................................................................................6 conductors #18 ga.
Columbia #04066..................................................................................................
..
Belden #8446......................................................
Columbia #04081 ................................................................................................... 6 conductors 2/18 ga., 4/22 ga.
Belden #8448......................................................................................................8 conductors 2/18 ga., 6/22 ga.
Columbia #04080
* *
Columbia #04083
'Use the 18 gauge conductors for connections to terminals 1 and 6.
When using 8-conductor cable, three of the smaller (22 ga.) wires can be joined together to make one heavier wire at terminai 3
on each end.
...................................................................................................8 conductors 2/18 ga., 6/22 ga.
..................................................................................................8 conductors 2/18 ga., 6/22 ga.
.............................................
6 conductors #22 ga.
6 conductors 2/18 ga., 4/22 ga.
PRELIMINARY TRIAL HOOK-UP
NOTE: It is recommended that the system be interconnected and tested on the ground using the intended
cable before installing the rotator high above ground.
Cable preparation — Top End:
(1) With a pen knife, cut out the thin web of plas
tic in the terminal cover just large enough for
your cable to pass snugly through it.
(2) Before cutting away any cable jacket, pass
the jacketed cable through the hole made
above.
(3) Next, remove 1'4 inches of the cable jacket, Fiqure #1
to expose the wires. See illustration #1. 6
(4) Next, strip J4 inch of insulation from each wire. Then twist and solder-coat (tin) the wires to keep any
strands from fraying. This is important, since the most difficult place to make repairs to connections is
at the top of the tower. See illustration #2.
(5) Connect a wire to each of the six terminals of the Rotator Motor Drive Unit. Form each wire snugly
around the terminal screw and tighten screw securely making certain that no loose strands touch any
other terminals. See illustration #3.
(6) Do not attach terminal cover in place yet, as you will need to double-check the wire colors connected
to each terminal when you connect the other end of the cable.
■ ■
........... "•
..
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Cable preparation — Bottom End:
(1) Remove 3J4" of jacket.
(2) After looking at figure #4, cut the length of each of the wires so that they will reach the terminals in
the same color sequence that you used at the top end. If you connected black to terminal one at the
top, then you must connect black to term inal one at the bottom, if red wire goes to terminal two at the
top, then red goes to terminal two at the bottom, and so forth through all six connections.
WARNING: FAILURE TO KEEP THESE COLORS STRAIGHT WILL LIKELY DESTROY THE METER
OR OTHER INTERNAL PARTS.
Record the colors used on the chart on the bottom of control case for future reference. See fig. #5.
(3) Strip the insulation off the wires >4 inch, twist the strands together and solder-coat them.
(4) Connect the wires to the terminals in the proper color sequence wrapping the tinned ends carefully
around the terminal screws and making certain that no loose strands of wire touch adjacent terminals
or other metal parts. -jg-
(5) Attach cable clamp, using the size clamp sup
plied which fits snugly to your cable. Use
washer and #6 nut supplied. See figure #4.
(6) Now go back to the Rotator Motor Drive Unit
and attach the terminal cover with the two #8
x S8 inch screws, mounting a cable clamp
under one of these screws. See fig. #6. Use
the cable clamp supplied that fits snugly
around your cable.
TESTING THE SYSTEM
You are now ready to try out your rotator and its connections on your bench.
(1) Set the Rotator Motor Drive Unit upright on the base (the end with the cable attached). Plug the power
cord into power outlet and turn on the power switch on the front panel. The meter should now be
illuminated.
(2) Press the right end of the control switch down and observe that the rotator turns clockwise when
looking down on it, and that the meter moves to the right. Press the left end of the switch down and
the rotator will turn counter-clockwise and the meter will move to the left.
(3) Observe that pressing the switch down half-way turns the rotator at slow speed, and pressing switch
all the way turns the rotator at normal speed. It should require about one minute for the rotator to
make a full 360 degree rotation (from S to S on the dial) at normal speed, and somewhat longer at slow
speed.
(4) If you run the rotator continuously and repeatedly back and forth for a considerable time it is norma!
for the thermal protector in the control to shut down the system for perhaps a half-hour to allow it to
cool off. When the meter light comes back on, the system is ready to operate again.
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CALIBRATION OF METER
(1) Run the unit full counter-clockwise by press
ing the left side of control switch. When ro
tator reaches stop, release the control switch.
Leave main power switch “ on” . If meter point
er is not on left-hand “ S” adjust it to read
exactly on left “ S” with a small screw-driver
through the hole beneath the meter. See
figure #7.
(2) Now run rotator to clockwise stop by pressing
right side of control switch. Release switch.
Using “ Calibrate” knob on panel, adjust meter
pointer to read on right-hand “ S” . Your HD-73
is now calibrated.
Figure #7
PREPARATION FOR INSTALLATION
(1) Depress control switch to set rotator to due North position, that is, so that meter points exactly at the
“ N” . Turn off power switch. Do not operate rotator again until you have antenna mounted.
(2) Make certain that you have recorded on the bottom of the control unit the color of the wire attached
to each terminal screw. (You must do this or otherwise you will be unable to re-attach the wires cor
rectly later since the rotator end connections will no longer be visible after it is installed above
ground.) Disconnect the wires from the control unit.
(3) You are now ready to make your installation with your antenna pointed north.
IN-TOWER INSTALLATION
(This is the best method)
You may have purchased a triangular plate with U-boIts for in-tower mounting. If so, use the hole-drilling
template supplied to provide matching holes for your rotator base mounting.
if a tower mounting plate is not available, you can construct one of either }\b " thick aluminum or Vs" thick
steel. Purchase also three y A" U-bolts which are of a size to pass around the tower cross braces. See
figure #8 for suggested design.
(1) Attach the plate to the top side of the tower cross braces which are about 3 feet from the bearing at
the very top of the tower.
(2) Attach the base of the rotator (the end with the cable attached) to the above plate securely with the
four %-18 x >2" long hex head screws and lock washers.
(3) Take a pair of mast supports (all 4 are alike) and attach them to each other with two (2) %s-18 x 2V 2"
long hex head bolts and lockwashers through the large hole of each support and into the smaller
threaded hole of the other (do not run the bolts and parts clear together as the short mast that w ill ex
tend vertically out the top of your tower must enter the open end).
(4) Place a “ U” bolt from the parts kit supplied through the end holes in the supports. Place “ V” clamp
on the projecting threaded ends of the “ U” bolt. Place / A" lockwashers and nuts on the U-bolt. Do not
tighten.
(5) Attach the mast supports to the top of the rotator with four (4) x 1" hex head screws, four (4)
lock washers, and four (4) flat washers finger tight.
(6) Center the mast supports by eye comparison of the two sets of four %" round bosses that show at
the base of the two clamps. This centering is necessary so mast stub will turn freely (not bind) in
tower top sleeve or bearing.
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top view Figure #8 Figure #9
(7) Place your mast through the top bearing of the tower and then into the open end of the loosely as
sembled mast supports as far as possible.
(8) Tighten the two %-18 x 2]/2" long hex head screws evenly (so space between mast supports is the
same on both sides).
(9) Tighten the two %" hex nuts on “ U” bolt evenly.
(10) With assembly centered, tighten the four screws securing the mast supports to the rotator top.
(11) Place two square-head cone-point set screws into the threaded center holes of the mast supports.
Tighten into the mast to lock the assembly. Optional increased locking strength is obtained by drilling
holes through both mast support center holes and tower extension and using a screw placed
through the holes held by a lockwasher and nut (not furnished). See figure #9.
(12) You are now ready to place your antenna onto the mast. BE SURE ANTENNA IS MOUNTED ON THE
MAST SO IT WILL BE POINTED NORTH WHEN TOWER IS RAISED.
TOP OF TOWER OR MAST MOUNTING
(Alternate method when antenna cross boom is no more than 2 feet above rotator top. Not suitable for
vertically or horizontally stacked antennas.)
(1) Take a pair of mast supports (all 4 are alike) and attach them to each other with two % "x2 j^" hex
head screws and lockwashers, by placing the screws through the larger unthreaded hole of each
support and screw partially into the smaller threaded hole of the other support (do not run the
screws and parts clear together as your tower extension or mast must enter later).
(2) Place a “ U” bolt through the two corner end holes of both mast supports. Place the “ V” shaped
clamp over the “ U” bolt ends. Place one y A" lockwasher and nut on each “ U” bolt threaded end.
(3) Place the open end of the mast support assembly onto the end of the tower extension or mast all the
way so that it bottoms in the mast clamp assembly.
(4) Tighten the Ju-18 x 2V 2" bolts alternately and moderately.
(5) Tighten the y y “ U” bolt nuts, alternately and securely.
(8) Go back and tighten the x
(7) Attach the rotator unit bottom (end with the terminals) with four (4) %-18 x 1" long hex head screws
with 5/{6" lockwashers and ?{6" plain flat washers to the pair of mast supports (just attached to the top of
tower stud or mast). Tighten screws securely. •
(8) Place a square-head cone-point set screw into each of the two threaded center holes. Tighten secure
ly into your tower extension or mast to lock the assembly. Optional increased locking strength is ob
tained by drilling 5i6" holes through both mast support center holes and tower extension and using a
Y y screw placed through the holes held by a lockwasher and nut (not furnished). See figure #11.
2 y y
bolts securely. See figure #10.
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(9) Assemble upper mast supports in a similar fashion and attach to top of rotator. Install upper mast
section into supports and tighten ali screws.
(10) Place antenna on mast so that it will be pointed North when the tower is raised.
COMPLETING CONNECTIONS
(1) Run 6 conductor control cable and antenna lead-in down the tower to your operating position, securing
both to the tower but leaving enough slack in the antenna lead-in to permit antenna rotation.
(2) Reconnect the six wires in the cable to the control case using the colors as you recorded them on the
bottom of the case. Reattach the plastic cable clamp with the washer and nut supplied.
(3) Attach your antenna lead-in to the radio, plug the control case power cord into a grounded wall out
let, and you are ready to use your Alliance HD-73 rotator for many years of satisfaction.
NOTE: Do not leave the antenna pointed due South against the rotator stop in either direction to avoid
wear and chatter against the stop in high winds. Your rotator will then be held in position by its
brake rather than against either of its stops at all times when not in use.
PLEASE FILL OUT AND MAIL THE WARRANTY CARD.
Repairs and adjustments may be taken care of by any of the many Alliance Dealers or Jobbers scattered
throughout the U.S.A. and Canada, or you may mail directly to our Service Department.
You may naturally order repair parts directly from the Company by listing the quantity, name and part num
ber with your order addressed to:
Service Department
The Alliance Manufacturing Co., Inc.
22790 Lake Park Boulevard
Alliance, Ohio 44601
The product described herein is made in accordance with the specifications at the time of publication. The
manufacturer reserves the right to change specifications as manufacturing and use requirements change.
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PART NO.
W-1 9 53 1 -R .
X-1 9 458 - A .
X-1 9 5 30 - R .
X - 9541- D .
X-1 9 3 90 - R .
X-1 9 3 89- B .
X-1 9 490 - A .
Y-1 9459- R .
X-1 9 464 - A .
W-1 9 4 61 -B .
X-1 9468 - R .
COM T Q O L CPvSEl
CONTROL CASE UNI'
NA M E
..C o nt ro l Case As s e m bl y
..Kn o b
..Co rd & Plug A s s e m b l y
..Str ain Relief
..Fuse Hol der A s s e m b ly
..Fuse, 1 A m p . 3AG
..C a pa c ito r
..Me te r A s s e m b l y
..Mo u n t in g S tu d, Thr ea ded
..C on tr ol Panel (tapped)
..P o te n ti o m e te r A s s y, (con tro l case)
PART NO.
X-1 9 4 55 - R
Y-1 9453-A
W-1 9472-A
Y-1 9 4 87 - R
X-1 9 4 6 7- R
Y-1 9 393 - B
X-1 9 460-A
X-1 9 462- A
X-1 9 537 - A
W-1 94 52-A
Z-1 94 54- A
NA M E
...Slid e S w i tc h As s e m b ly
...N am e Plate
...Cha ss is
.. .T ra n sf or m e r
... S wi tc h Base & T ab Ass e m b l y
... A c tu a t o r , Sw i tc h
...Cam , Slide S to p '
...Slide, Stop
...Sp rin g, Return
...Case, C on tr ol
...Bezel
Y - 1 9469- R .. Ci rc ui t Board & Co m p o ne n ts A ssy .
1 8 ohm — 5%
82 o hm — 5%
68 oh m — 5%
4-70 o hm - 5 %
4.7 v o l t 10 % -
IN400 2 - 1 am p.
IN 5 4 0 1 — 3 amp.
#7 57 /am p . -
1 55-189 mf
— % wat t
— Vi w at t
— 1 wat t
— % wat t
4 00 mi ll i w a t t
1 00 vo lt
1 0 0 vo lt
zener d iod e
diode
diode
28 vo lt — 8 0 m il liam p
■ 50 V A C — mo to r ca pa c ito r C 3
PART MO. NA M E
W-1 940 0- R ....R o ta t o r As s e m b ly
2-1 94 01 -B ...H o u si ng , Lo w e r (tappe d)
Z - 1 94 10- R ... . Mo t o r & Dri ve As s e m b ly
X - 19437- R ....Ge ar & Pinion As s e m b ly
X - 19436- B ... .S h a ft , 1 st stage
X - 87 1 8-A ....Re ta ini ng Ring (bo we d )
X - 19412- B .. .. S ha f t, Gear
X-1 9 4 35- B .... S h a ft , Gear •
X - 19 443- R ....G ear & Pinion As s e m b ly
X - 19443- S ... .Ge ar & Pinion A s se m b l y
X - 19444- R ....G ea r & Pinion As s e m b ly
X - 19445- R ....G ea r & Bus hin g As s e m b ly
X -194 47- A ....S p ac er
X-1 9 447 - B .... Sp a ce r
X - 19448- R ... .P o t en t io m e t e r Ass y , (rotato r)
Y -1942 8- A ... .Ge ar & Pinion (mo lded)
X - 19 439- R ....G ear & Hub A ss e m b ly
X - 19 425- R ....B ra ke Disc & Pinion As s e m bl y
Y - 1942 1- R . .. .R o to r As s emb ly
Y-1 947 4- R ....Fie ld & Te rm in al A ss e m b l y
Y - 4 20 0- U ... .End Bracke t Ass e m b ly
X - 6 1 2- D ....Ball
Z - 194 03- A ....G ear , Interna!
X - 19 409-A .... Le ver , S to p
X - 81 2 9-A ....Reta ine r, Pus hn ut
W- 194 0 2-B ....H o u s in g , Upper (machine)
Z - 1940 4 -A ....R in g, Clamp (cast)
X - 8062-Q ....S c r e w , Ta p t it e Hex. Head
Z - 1 9405- B .. .. Ma s t C lam p (tapped)
X-1 9 434 - A ...."V” Clamp
X-1 9 433 - A .... U -B o lt
nroR UNIT
£-19 433
X-194 33
X-19 434
2-19405
W-19402
Z-194 0 3
Z-19401
Z-194 04
¥$—x-:-1943 4
Y-4200
X-871 8
X-194 12
Y-1 9421
X-19 425
X-1 9428
X-19 435
Z - 19410 X-19 437
X-19 436
X - 19439
X-19 443
X - 19444
X-19 445
X-19447
X-19 448
Y-1947 4
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TROUBLE SHOOTING
The most frequent cause of rotator problems has been in the cable connections. It is vital that the
wires in the cable be connected with each colored wire attached to the same numbered terminal at each
end. Also extreme care must betaken to avoid broken wires, wires shorting accidently to adjacent termi
nals and bared wires touching anything metallic except the intended terminals. Extra care in preparing the
cable ends by stripping, tinning, forming the tinned ends around the terminal screws, and using properly
the cable strain reliefs supplied will lead to long, trouble-free service.
Another possible cause of trouble in a heavy, gusting wind condition would be undesired antenna
rotation. The mast support clamps must be tight, and set screws or through bolts must be used to prevent
ro ta t io n . ^
The most likely cause of weakened rotational power is a faulty motor capacitor in the control box.
It is normal for the thermostat in the power transformer in the control box to shut down the system if
me rotator is run continuously back and forth for several complete end-to-end rotations. Allowinq the sys
tem to cool for 20 to 30 minutes will restore service.
Short circuits in the external connections to the control box can blow the fuse. Replace it only with
the same type (3AG) one ampere fuse.
The meter lamp should last for a very long time, however, if it needs replacement, use type #757 only.
Before deciding that it w ill be necessary to bring the Rotator Motor Drive Unit down to the ground for
service, it would be well to check the resistances of this unit as follows:
A) Disconnect the six wires from the control box.
B) With an ohmmeter, check the resistance from wire to wire in the cable leading to the rotator. You
should find about 5 ohms from lead 1 to 6, 3 ohms from lead 3 to lead 1 and lead 3 to lead 6, 75 ohms
from lead 4 to lead 5, and a value from 0 to 75 ohms from lead 4 to lead 2. None of the leads should
show continuity to the tower or mast which supports the rotator. Also, leads 1, 3, and 6 should not
show continuity to leads 2, 4, or 5. Readings other than these mean shorts or opens in the cable, the
cable terminations, or lastly inside the rotator unit itself. ’
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ALLIANCE
MANUFACTURING GO. INC.
22790 LAKE PARK BLVD.
ALLIANCE, OHIO 44601
A NORTH AMERICAN PHILIPS COMPANY
X-1 9522-C
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