Controlaire SH-100 User manual

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OPERATING
INSTRUCTIONS
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SH-100 Single Channel SuPerhet
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Voltage measursnents taken wjth Heathkit lM-13' V.T.V.M.
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ceiver battery. Receiver idling' No signai from trans-
mitter. Note'divided circles on diagram, top no voltage
measured, lower No is circuit board hole that identifies
copper iind to which place DC probe. Normal neasurement
can vary plus or rninus 20% due to component tolerances.
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CONTROLAIRE SH-1OO
OPE RATING INSTRUC TIONS
The SH-100 is an all-transistorized superhet receiver
with its output terminated in the use of a S.P.D.T. relay,
This feature allows for simple application to pulse or
escapement type of control systems. Unlike earlier single
channel superhet receivers, the SH-100 exhibits acertain
immunity to the R.F. noise interference generated bythe
electrical control system of your aircraft. This is
accomplished by a design feature that allows extreme
signal clipping to take place within the receivers I.F.
section. By this elipping action noise of reasonable
amplitude is eliminated from appearing in the I.F.
carrier. If noise does not appear, it cannot be detected
as an interference signal to actuate the receivers relay.
No superhet can reject any and all conditions of noise
interference, holever, the SH-100 presents a definite
improvement. Other design features include temperature
compensation from 0 degrees to 130 degrees F., a
strong protective metal case and 3 volt operation.
Receivers are available in any of the following frequencies.
26.995mc, 27.045me, 27,095me, 27.L45mc, 27,L95mc.
Special units on 6 meters at 52 and 53mc are available by
special order.
TRANSMITTER REQUIREMENTS
Due to the extreme clipping action that takes place within
the receivers I.F. section, the SH-100 must be operated
with a companion transmitter of high modulation per-
centage. Minimum is 90/o and the best 100/0. If trans-
mitters of less than 90/o are used you may find a nulling
or no signal condition exhibited by the receiver at
varied distances from the transmitter. For this reason
do not attempt to operate the SH-100 with either the
Controlaire multi or single channel "MuIe" transmitters.
These units, while perfect for other Controlaire re-
ceivers, have 85/o modulation and, in most cases, will
not operate the special purpose SH-100. For bestresults
we recommend the new Controlaire "Mark II Mule".
This is an all-transistor unit and has been designed
specifically for the SH-f00. Other transmitter require-
ments ate a radiated RF output in excess of 75 milla-
watts and a tone frequency falling between 400 to 1200
C.P.S.

BATTERY REQUIREMENTS
2,4 to 3.6 volts is required. Factory assembled receivers
are adjusted to 3 volts. At 2,4 sensitivity will be slightly
reduced and at 3.6 slightly increased. For best results
a separate set of batteries, two pen cells, should be used
to power the receiver and a separate set used to power
your escapement or servo actuator. Batteries should be
measured with receiver turned on and actuated with
transmitted signal.
RECEIVER OPERATION
With transmitter turned off, receiver turned on, the
receiver should idie at about2or3ma, This is measured
by a 0-50 ma milliampmeter as shown installed in the
receiver circuit. The reading should be steady except
if in your testing area you are bothered with electrical
disturbances. This could be noisy fluorescent light,
electric motor, etc. In this case the idle may be higher
and nervous in action. In any case, the idle should quiet
down when your transmitter carrier signal is turned on.
Presence of the carrier should bring the idle current to
a steady 6 or 7 ma. In operation it is the presence of the
transmitted carrier that enables the receiver to reject
noise and electrical disturbances. With carrier off you
may notice noise pick-up. As you key a transmitted tone
signal the receiver current should rise from about 6 ma
to about 48 ma. Thiscurrentchangeactuatesthe receiver
relay and thus in turn you control escapement or servo
actuator.
It might be noted during very close-in ground operation
your receiver may be afiected by an adjacent channel
operator if you are close in to his transmitter. This wiil
be more pronounced if your transmitter carrier is off.
With transmitter carrier on, your receiver will tend to
reject the adjacent channel transmitter. A few field
tests with your buddy on the adjacent channel will
acquaint you with close-in operation limits. For ground
operation you might experience interaction if taxiing
closer than 20 feet of your buddy'stransmitterrhowever,
beyond this distance and in the air, no interference will
be noted.
RECEtrVER TUNING
The receiver was tuned at the factory and, assuming no

shipping or handling abuse, should still be in perfect
order; however, before flying it is best to check. Tuning
and sensitivity is checked by operating receiver with
antenna-less transmitter and noting the maximum dis-
tance operation can be obtained. To do this, point the
sub-antenna of your Mark II Mule transmitter, main
antenna removed, at the stretched out endofthe receiver
antenna and key tone signal. If you get good operation
out to a distance of 15" all is in order to fly. If not,
accomplish the following check. Install tuning meter and
note at the 15" distarice if current is rising to 40 ma.
If so, then relay adjustment or cleanliness is reason for
non-operation. If' small or no rise is noted, receiver
tuning is probably at fault. To retune the receiver, use
the following procedure.
-The tuning tool should be insulated and fabricated to fit
slots of both the antenna, coil and IF cans. Do not use
metal screwdriver or metal tipped tools. Again, operate
receiver with antenna-less transmitter, bringing it
close enough to receiver antenna to get a small reading.
Start at the mixer IF can (yellow slug) and slowly adjusr
slug for highest reading on meter. As the slug is peaked
and current rises to the maximum level of about 48 ma,
back transmitter away to drop the current so an exact
peak can be obtained. Do not try to peak any adjustment
with receiver current at saturation level, back trans-
mitter away to weaken input signal so peak can be
obtained. After the mixer has been peaked, go the first
IF (white slug) and repeat the above. In sequence, back
away transmitter and weaken signal each time adjustment
brings current level to saturation. In same manner,
peak the second IF (yellow slug) and last, with receiver
lid on, peak slug of antenna coil. Presence of receiver
lid will not affect IF tuning, on or off, however, it does
affect the antenna coil. You will note while tuning that
adjustments to the mixer and first IF are somewhat
critical but tends to broaden out at the second IF and
antenna coil. This is normal. When tuning is finished
you should get at least a 40 ma reading at the minimum
15" distance. The average will be about 24". This
completes the tuning adjustment.
Do not attempt tuning by the distance check method. It
cannot be done. You may try a ground distance check
for personal satisfaction, if desired. If properly tuned
as described ahove with minimum of 15" operation,
ground range (receiver held head height) will be in
excess of one-half mile in open country.

I
If you experience trouble and cannot get operation at the
minimum distance, check transmitter for proper output
and battery condition. The distance as expressed above
are for companion use with the Controlaire MarkII Mule
transmitter only. Other transmitters may give varied
distances due to varied output less antenna, etc. Rem-
ember, for proper operation of the SH-100 it requires a
transmitter capable of 90/o or more modulation.
RELAY CONTACTS
Occasionally, clean the relay contacts with a contact
burnisher oi real fine emery paper. Dust or dirt in the
contacts can rea1ly bug you so use common sense with
respect to cleanliness.
RELAY ADJUSTMENT
As supplied, the 5O ohm relay has been adjusted to pull
in at abbut 35 maanddropoutabout 20 ma. Under normal
conditions it should remain in adjustment, however'
after a hard knock you may have to readjust assuming
operation is affected. In practice the relay is first
adiusted by bending armature contact so a condition of
pult-in allows the armature contact to strike the lower
iixed contact before the main armature contacts the coil
pole piece. In praetice: actuate the armature lightly with
your - finger or small tool and notice that when the
contacts are just closing that a small air gap is visible-
about .001 between main armature and coil pole piece.
After this is adjusted lightlyhold therelayin a pulled-in
condition and adjust clearance between moving contact
and upper contatt to be about .003". This is done by
bending upper contact. Generally, -after these fixed
adjustments are made the actual pull-in and drop out
can be adjusted by increasing or decreasing armature
coil sprin! tension. Increase tension to increase pull-in
point and vice versa.
NOISE SUPRESSION
As expressed earlier, the SH-100 is a special purpose
unit that has a certain immunity to noise reception'
however, in any receiver there is a limit as to the
amount 'the rec-eiver can reject. To guide you in the
assembly of a clean installation we pass on to you the
following information.
Just what is a noise condition and how will it affect the
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receiver? First, the effect is a chattering or unwanted
intermittant operation of the receiver. This is caused by
noise signals generated within the aircraft. One noise
condition is the RF signal generated by the sparking of
an electric servo motor. This is best eliminated or
minimized by use of an .05 to .1 mf condenser installed
across the motor brush terminals. One other condition
is the antenna effect noise created by use of long metal
torque rods to operate control surfaces.
ANTENNA EFFECT FROM METAL TORQUE RODS. ThiS
is tricky to explain. We could just say "use wooden
torque rods" - but we know that you might use metal
rods anyway unless we explained it - or at least tried
to. A metal torque rod adds to the antenna length
intermittently. Say the antenna would normally give the
receiver a I/4 volt signal. Then the torque rod (shorting
through the escapement momentarily as it revolves)gives
added antenna effect. This increases the voltage to' say,
I /2 voIt, Seen on an oscilliscope this varying antelna
voltage appears as a tone blip or an audio signal. This
fires the receiver again. The escapement revolves again-
the cycle continues and we have what is called "motor
boating" or a relay chatteri.ng situation. This "antenna
ef ect" condition is most noticeable (and bothersome)
where the transmitter is close to the receiver. This is a
clue in the recognition of this problem - operafe the
s!-srem rvirh the transmitter close to the plane and watch
ior "motor boating"
To conclude, after all this explanation, we again advise
that you do not use all metal torque rods. Use wooden
rods with small metal end fittings as necessary but
minimize the metal length.
Other sources of noise are intermittent battery box
connections and switch contacts.
WARRANTY
Guarantee is extended that factory assembled receivers,
not kits, be free of workmanship and parts defect for a
period of 60 days from date of purchase. This is valid
only if receiver is operated within scope of instructions
presented and used with a companion CONTROLAIRE
MARK II MULE transmitter. We reserve the right of
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lnspection to determine abuse or improper operationand
if evident in our opinion, guarantee is void. No responsi-
bility is assumed for damage inflicted by shipping or
handling organizations. When returning a receiver for
guarantee service, state this fact, along with full
particulars of why you think unit is defective. Enclose
particulars in carton, pack weJ1, and send direct to
Controlaire Division, World Engines, Inc. Do not return
to your dealer as in most cases details and particulars
are omitted and misunderstandings result.
SERVICE
The minimum fee for inspection and repair ls $4.50.
Inelude thls amount with receiver. If inspection reveals
charges to be in excess of $10.00 you will be nocified
for approval of intended repair.
Include all symptoms of malfunction to lessen our
troubleshooting time and costs to you. Parts are quoted
net and no dealers discount is offered. In no ease will
repair exceed 50/o of the origlnal selling price. Print
name and address, pack well, and attach or enclose
letter of partlculars in return carton. Allow two weeks
for receipt, repair and return. Send repair work to
CONTROLAIRE DIVISION, WORLD ENGINES, INC. 8206
Blue Ash Road, Cincinnati, Ohio 45236, Do not return
repair work to your dealer.
The Mark II Mule is recomrnended for best results
$ 29. e5
Contnolair.e El. cLronics Diuision
Vo'lJ E" gines,ln".
8206 Blue Ash Road
Gincinnati 36, Ohio