Bendix Radio RA-1B, RA-1I, RA-1J Service manual
I NSTRUCT I ON
for
BOOK
MODELS
AI
RCRAFT RECEIVER
IB, RA-
RA-
IT
AND RA-
EQU IPMENT
IJ
TJARRANTY
.
Bendix
The
defects th
of
the eguipnents are
good
after
portation charges
faction, to hdve been thus
)
tubes
terials
ln
ducts
to
resultlng
Latlon
to
at its
dellvery to the
or
l1eu of all
of the Corporatj.on whlch hd.ve been repslred
nisuse
assuroe for
Radio Corporation
materlaL and
lntended.
fa.ctory
prepaicl,
their
that cannot be dlscctvered by
or abuse. The Corporation is
dlrectly
of any of 1ts
operationl further, this warranty does not apply to
other
or lndirectll'
1t any other llablllty 1n
part
sny
orlginal
warrantles expressed or inxplied, and does not apply to
products,
warrants
workmanship under
The
parts
or
purchaser, be returned to the
ancl which its
defective.
and
each equlpment manufactured by
obllgatlon of
thereof, whlch shaLl, wlthin nlnety
exanlnatlon
The Corporatlon
ordlnary
not
liable
from the
neither
design, material,
assumes
connection with the
the normal
the Cor?oratlon
shall disclose, to its
makes no rvarranty
factory
inspectlon.
altered,
or
for
any danage
nor
authorlzes
to be free
1t
use and sefvlce
ls llolted
Corporatlon vrlth trans-
any
This
or h€ive been
personal
or
worknanshlp,
arry other
sale of 1t6 egulpnents.
for which
to
(90)
of
defeet
warranty
any
or lnstal-
Eaklng
days
satis-
vacuunr
in na.-
1s
pro-
subJect
injury
person
BEIIDI X RADIO
Baltimore, Maryland
)
8.
l.
300
u.
CORPORATIO}I
A.
s.
"s'
,lanudr!,
l9ttl
l.
tilTR0DUCTloil
i- 1,
f-2.
1-3.
,!\r!iction
Cornposition
ElectrlcalCharacterlstlcs...
!-4, Additlonal
l-5. Antenna
1-6.
1-7.
PowerRequlrenenEs..:.
SlnlLer
TABIE
Equipnent Requlred
Requirenents
Recelver
Equlpnent
OF
.....
.
.CONTE}ITS
. ..
Pog e
1
. 1
2
I
4
5
.5
5
10
10
. L2
t2
13
13
13
L4
.
,
L4
t4
L4
L4
16
18
7
8
I
2-2,
2-3. Power Supply . . . . . . . .
2-4.
2-6. Remote
I t{STALLAT l0r{
3.
3-1.
3-2.
3-3. Locatlon and 
ADDRESSES
OF
MA}IUFACTURERS
31
fig.
F1g.
Fig.
Fig. 4
Fig. 5
Fig.
Fig. 7
Fig.
Fig.
Flg.10
Fig. 11
Fig. !2
Fig. 13
Flg. L4
Flg.
Flg.
I
15
16
Type
1
Type
2
T1'pe
3
Type
Type
Type
6
TJ'pe
Diagram
Ty?e
I
Tfpe
Tfpe
Dynamotor
Remote Control
Type
Sehematlc
Type
I LLUSTRAT
RA-1l
RA-18
RA-18 Alrcraft
RA-18 Aircraft
RA- 18 Alrcraf t Recelver
MP-58
MR-
RA-18
MR-38A
MR-18
MP-58 or
RA-18
Alrcraft
Alrcraft Recelver
MP-5A24
or
Remote Control
18
External
of
Receiver
Shock Mor:nti.ng,
Renote Control
Base
Diagran
Plate,
Base
MP-5A24,
Reeeiver,
Radlo ReceLver
Receiver
Receiver
Dynamotor
Unlt
Connections
Unit,0utline
Unit, 0utline
Outllne
Plate,
Outline
Block
(Rear
(Top
(Bottom
(.Front
.Filter Unlt
0utline
Drawing
Outline
Drawing
Dlagram
ONS
I
Eguipnent
0b11que
View)
View)
0b11que
Drawing
Drawlng
Drawing
Drawing
$r
Vlew)
Vlew)
l_
lr STRUCT
I
| 0r{
lor
B00K
I
I
l_
I
I
!o
MOOEL
RA-18,
RA-II
AND RA-IJ
AlRCRAFT RECEIVER EOUI
| .
tNTRoDUCT tot't
l-t.
alrcraft. It nay be enpLoyeat for the reception.
radlo
200 rneters)
glve
cy
Bendlx
front panel,
Type
Jum?er
pernj.t
supplied rylth.the
As
(llP-58)
l-2.
FultcTtoil
The Bendlx Type
telephone
and
full cciverage
Aural dlrectlon flndlng
range froE O.2 to 1.5
Directlon,Flndlng
The
recelver ls deslgned
or
18
MR-
The
the
Remote Control
receiver
connectlons
arranglng the circult tor L2-
power
or
supply
24-voLt
RA-18
slgna.ls withln frequency ranges
1"8 to 15.0
ln each
from
nay
any
be
operated
belng
circuit arranged for 12-volt
unlt cannot be converted lt
(lF-5A24)
c0MP0s tT r0r{
Type
A
RA- 18 Recelver
Becefver.ls
Eegacycles
frequency
and
loop antenna
negs.cycles by using the recelvers
EqulpEent.
to be
reEote point
Unlt whlch lncluales dupllcate
prctvlded
lnstallation lncluales the followlng
operateat locally, uslng
fron
Dynano tor-Fil
conmunicatLon recelver
a
(166
range.
within the
elther a
at a
or
to
20 neters). Three.bands
receptlon
12-
teralnal board
24-volt
operatlon unless
ter unit as requlred.
PMENT
alesi.gned.
of contlnuous.wave
of 0.15
alrplane
or
operatlon. lhe recelver
1s
to
1.5
negacycles
be
nay
24-voLt
necessary to
obtained
ln conJunctlon
the
controLs
through
operatlng controls.
storage
the
in
receiver chassls to
otherrylse specifieal,
equipnent:
telegraph or
over a
nounted on lts
the
use
battery
use the
for use
(2000
are used
frequen-
wlth the
Bendi*
of
supply,
will be
12-vo1t
in
to
to
Iten
A
B
c
D
E
Quant
1
1
1
1
1
1
1
y
t
i
Type
Type
Type
Type
Type
Type
plug
Type
plugs,
Part
RA-18
tubes
Cable
operatlon or
operation,
z-conductor,
switch.) Part
is
8-cond.uctor,
(1-6K6G;
MR-38A
MR-18
PIug
MP-58 Power
MP-5A24
AF6372
(Power
.
Q87633.
AF9355
(Receiver
nr:mber
De
Receiver
5-6K7G; 1-6R7G; 1-6L7G)
Shockproof
Remote Control
Porver
with
Shielded
ft.
5
Supply
number
Shield,ed
15
cable
of
if
s cr
Supply for
cable
ft.
to
ti,on lle i g
with
Supply
long, not
long, not
Remote Co'ntro1 Unit.)
cable
Mountlng
Unit
for
plugs.
cable
to
shlp
the
of
cable
only
is
LL/L4-volt
assembly,
'
assembly,
plugs,
Base
with
24/28-vott
wi.red to
s
mas ter
cable only
wlred
87553.
to
h
t- I
with 25.1
L.+
4.25
8.9
bs
PaQe 1
Iten
G
Quant
1
i t
F
J
J'
y
True
6-conductor,
plugs
Part
Type
15 ft.
but
Instruction
AFg353
.
number
Q815460
long,
are
Descriftion
Shielded cable assembly,
15 ft. long,
(Power
attached. to
Suppl5'
cable
of
FIexible
all
Book
fittings &re
only is
one
not wired to
Unit
Tuning Shafts,
end
Rece
to
875+4.
supplied
only.
iver
lleight:
.
)
lbs
*
$
e
i$
3
dl
N0TE3
sup?lied ln the
The
Receiver
Renote
Power
-3.
I
r-3-
the
the
Extenslon
f
o
Unless otherwlse
dimenslons
with
Control
Supply
ELECTR I
t.
frequency
end
appr ox iEa.t ely
CAL
FREQUEilCY EAlrDS
liFlts of whlch
of
above
shochount
Unit
of
the
Dentloneal
CHARACTER
ranges
Band
Band
Band
Band
Band
Band
each
4"
1
. .
2
o . . .
3
.
4
5
6
tunlng
.
specifleal
equlpnent
I ST
I
covered
are
as
. .
. .
.
.
. .
. .
range
by custoner, the tuning
length8.
are!
9
9
4
CS
by the
follows:
. . .
. .
. . ' . . . ' . .680
receiver
. . . .
.
. . . . . .
beyonct the
are
.
nonlnal
Y
idth
t3/t6"
3/+n
3/8u
divlateal
.15
.315
1.9
3.7
7.5
banat
shafts anat cables w111 be
D
th
16
3
7
mc.
mc.
mc.
mc.
mc.
en overlap
ef
t/9"
t/+n
3/8n
baJtds,
Feight
7/8n
8
7
L/8n
7
7./2'
lnto slx
to
to
to
to
to
to
15.0
llnit
opera.ting
.315 ttrc.
.680.
1
.5
3
.7
7
.5
provlctes
(f
$
rt
r
I
*
I
I
I
,
I
T
t
t-s-2. sEIstTtvtTY
The CW
the volune
1nput.
Tbe
nlcrovolts
to
e 300=ohp,.1oat1,.w1th.a.
signal
l-3-3. SELECTTVTTY
lhe
resonance
varylng
resonance.
follows:
sensltlvtty
control
MCW sensltivlty
or
3096
oodulatett
selectlvlty
to the input voltage
the input voltage
The
1s aauusted to
better
of the recelver
seLectlvlty
of the recelver
on
at 400
of the
Band.s
slgna1 to
CpS.
to
of the
1s 2 mtcrcvolts for a 50-n1111watt
glve
recelver is
7,,
2 or 3 for the stantlaral
gt
nalntaln
a noise
noise ratio
is
lndls&ted
resonance,
a
Type RA-18 Recelver
Pate
output of 5 nilliwatts wlth no carrier
nlcrovolts on
4
by.
glven
at
constant
2
Ba,nds
output of
of at-least
the ratlo
banat widthi
output.level
a,t representatlve frequencles
4, 5
to 1, antl
4
the input volta€e
of
for
or 6
50
Drilliuatts ln-
anal ls observeal
frequencles off
outpdt
anal ls
an
when
5
input
off
by
-3 -{.
|
The
dlscrlmlnatlon
celver
NOTE:
ls
ls
As
poorest,
quencleg.
Infut
10
100
1000
IMAOE
REJECTIOII
given
ln
I
ond
1ri..o.a......
2a!aaaa...r...
3
4
5
6
the frequency
conElalerably
lol,tage
t
lmes
tlmes
tlmgs ,'.
aaaaalooaa
rattaaaaaa
.
agalnst.
lnage
the followlng
speclfied
better
.
. .
. r . .
frequencLes
table:
Frequency
15.00
each
1n
band
alnlnum ratlos
150 hc.
13kc.
20
over the
.915
.
680
1 .50
3. 70
7.50
1s
wilI
Iotal,
R
eference
'
at
7
For
k".
kc.
mc.
mc.
Etc.
nc.
mc.
mc.
that
be assured for
Bdrd, l{idth
quenc
700
15
124
32
lre
hc.'
kc.
kc.
kc.
ies
3000 hc.
18 kc.
28kc.
40
various ranges
tr[ininun
Rotio
200,000
90
0oo
r
35,000
7,
000
21 000
11 000
whlch
the tlrage
ell
kc.
re-
the
of
reJectLor:
other fre-
fio
t-3-5. RE80[AilCE
The
resonance
tlon
through
frequency
klloeycles
under
A.
B.
C.
D.
E.
I.3.8.
the
the
*ny
20oC teEtr)ersture
Hul[lauty varletlon
Battery
Nornal
.
Manlpulatlon
OVERALL
Th€
ovprall
antenna
ectlvlty
Banal
0n
range
lEately
over
-_0n
DB
0n
over
of
15
Bands
the
Bands
the range
the
ln kllocyeles,
through
followlng
voltage
vlbratlon
to
requlreEents
1r .150
200 to
DB
2 enat 3,
renge
4,
STABtLITY
stabllity
1.8
of the
FIDELITY
fldellty
the
to .316
1500 cycles
beloyr
of 200
5
and
of 200 to
to
15.0
and
the .15
of the
to
Type RA-18
megacycle
lt wlrr
1.5 megacycle
conalltlons:
varletlons
between
varlatlon
zero and
of lV",
as encountereal
sensltlvlty
characterlstlc
output terElnal6
ln the
range
negacycles
per
6econd.,
the
lavel
.315
to
2000 cycles
6,
1.800 to
it fOOO cycles
to
1.600
18.00 Begacycres
3000
cycles
Receiver
range
not
between
wlll
exeeed,
range.
the
10@.
1n alrcr&ft.
controt
varles,
of 160
of
the
to
fron
on
600
the output
p000
cycles
per
negacycres
per
second.
per
second..
ls such that
not
exceed.
t/z
llnlts
L/"
of
These
of
maxlnuo
Type
RA-IB
the d,lfferent
kl.locycles.
varles plus
per
second ls
second..
the
output
the
output varles
t/+
of L6t
of the
ratlngs
-2Oo
to
Elnluu!.
slgnal
and
Recelver
banals,
or nlnus 6 DB
attenuated approx-
varles
llus
the
varla-
slgnal
the
w111
slgnal
of
frequency
be obtalnei
+SOoC.
as Eeasured
alue to
the 6eI-
over the
or nlnus g DB
plus
or nlnus
1r:
fron
6
I-3-7.
output
.The
wllI
dellver
properly
POHEN
OUTPUI
clrcult
over
loaded.
600
The
ol the
n1lllwatts
naxlnum
rype
RA-
possible
Recefver
18
output
output
Page
ls deslgne4 for a
at not
over
ls 1.6 watts.
I
ten
percent
goo-ohn
road and
allstortlon
when
-|+.
ADD
tTt
|
The following
tlon of
Iter
A
0NAL
equlpment.
the
addltlonal
Quont
B
c
-5
.
I
nay
ln
or
ent
FA
selectlon of
selects the source of
tenna is connected.
tenna is then connected dlrectly
tenns 1s connected
ls
coBpensate
antenna swltch
the DLrection F1nder AnpLlfler anal
swltch.
through the bantl swltch
conpensates
by
sults
run
antenna
electric losses are
. range
fuselage between
ceiver and.
tlon would have the
insulateal conductor
#18
plane. Thls
J
that
every effort should be nade
least one-half
purpose, however, 1f they aie
blo"k"
dlrectly to netal
recelvlng, the wlre connectlng
lng
pernlti
bodlea wherever
AlrTENlrA REQU
Type
The
be
the transBltter. Provlslons
tralllng
select-Lon
(Dlrectlon
connected to the
lfhen
proxinlty to a suitable locatLon
eround
B
ected to stress lnvolvlng
thls leatt
When
post
RA-iB
operatetl
antenn& and the apptlcable
by neans of
p1tr6g1
whichever antenna connectlon
the varylng
for
set at
In serles
for antennas
u$ing a Separate
cannot
binding
of
& S
trp""gnated
the
be
the
lnterlor of
the recelver
nay seriously
gauge
lead
transnltting antenna 1s
the transnltter
on
care'should
PMENT REQU I RED
EQU I
equlpment
y
it
2
1
1 Prinary
Type
ohm, head
Antenna-gror:nd
TREMET{TS
necetver
wlth the transmtttlng
to
to A, the antenna
recelver input through
wtth
obt&lneal
post.
greater.
the
receiver.connected
suspenaleal ln
ale sultable
should not be located
be
longer
lnch.
with
neEbers .
posslble.
nay be operateat
are lncludeal
a three-posltlon
Ainpllfler,
signal input to
blnillng
chafacterlstlcs
DF,
the lnput of
the antenna.
51,
of
antenna for
at any frequency
Thls is
w11t not have e large
leeal-ln lnsulator
reduce tbe signal
than one
Gless
pa.raffln wax
be taken to
Trall1ng Antenna,
post
1s e
allfferlng
the fuselage
particularly
A
recelving
for radlo
the tenslle
to space- 1t
porcelaln
or
not avallstLer.
b indlirg
should
w111
MR-8A
A,
the recelver
to
terDlnal
sEall
the
for the
alr throughout
foot or
used
be nade
prevent
be
Headphone
band
power
antenn&
Benclix
the
the entenna
swltch
anrl
varlable
capacltles.
recelvlng
as
post A on
source
witb s
antenna
ls alesireal.
recelver.
S15 ls
e
of
the recelver
the
recelver,
recelvlng
lf
for
antenna
and the
energy
to the
that
so
strength
support
alay
stanat-off
spaeers
tn conJunctlon
as short
lts
requlred
Descriftion
type
system
through
the
1n
Dlrectlon
fixeal
the
A 1s
prinary
antenna
the Leaal
several
hernful
capaclty.
antenna
antenna leatl-1n
its length;
froD
it 1s
rather
the receiver
comlng
to
Receiver
(see
(see
Section
seperate
the
receiver
Flntter
swltch
Flxeat Antenna)
The knob
when
s$ltch
1nput.
at
set
setlea
tra.lling
connected
16
grounded
of
trlmer
cholce
the
antenna leatl-ln.
to the
feet before
at
sultable
blndlng
reachlng
antenna
it 1s likely
the
of
requlred
1s
netal structural
lneuletors
preferable
than
wlth
and
lnto
effect
Section
recelvlng
break-ln
(S15)
the &1rplene's
1s
When ihe
TA, antl
condenser
the antenna
htgh
aaldltlonat
connectlon
Ytlre. If
aa tllrect
satlsfactory
equivalent
or
1-5)
t-6)
the
for
Adpllfier.
narked
facllltates
narked ANTENNA
at
set
tralllng
the tralllng
wire
by
for the
It.
to secure
proxlnity
antenna'
to
antenna
the
condenser
locatlon
of
recelvlng
connectlng
frequencies
Post
The itleal
by neans
Conductors
be struck
to
along
are
to use
the break-1n
the
and
opera-
500
antenna,
relay
use of a
FAr antl
which serves
coll
entire
capaclty
insiale
1t
as
contalned
Convenl-
TA, and
DF,
SWITCH
flxed,
the an-.
wire
Wlth the
the output
selector
assembly;
C81
governed
1S
The best
antenne
to
where
frequency
to
shrmts
ls
nenbers
ldeal for
this
RECEIVER
clrcunstances
wlth
the
installa-
of a
of
f16
the
or
neceasary
length,
lts
wooden
atry
conductor
relay
netalllc
1t
or
flxed
rapld
an-
an-
wlre
to
of
whlch
re-
the
dl-
the
re-
slngle
and
alr-
sub-
by &t
thls
for
b1nd-
is
Page
4
In
vlbratlon
of
The
est
Thls
.ceses the
ell
gr
ound bindlng
netal
ground
a.ntenna
belng transferreal
post
nenber
lead nust te short, not exceedlng a foot
of the fuselage uslng a flrm clean
le.ad6
C
should be connected.by
nust
to the recelver
have 6lack,
through
thls eltnlnetes
the leadi.
heevy
a
1n length.
flexlble
Jolnt,
any
wlre
preferably
pos6ibll1ty
near-
the
to
6o1dered.
t-6.
MP-58
0.8
rv1ll
a?proxlnately
t-7.
I-7.1.
1I
cept for the
transforner
Recelver tllffers
uslng this e
&ry
I-7.2. TYPE RA-IJ
the
P0WER REQUtREMEIITS
lz-volt operatlon the
For
power
anperes antl
supply requlres
approxlmateLy
be requlre<I for
70
n1lllauperes
SIMtLAR RECETYER
TYPE
llhen 1t 1s desira.ble
Recelver
The Benalix Type
4000-oha
A
An addltionaL
when
The Benttlx Type RA-U
frequency
RA-II RECEIVER
nay be
local duaI volune
Tl.
only
hlgb
qulpEent.
parts
referrlng
ranges
recelver flla^llent. current
epproxtnately
1.5 dtrperes current
24-volt
operatlon.
225 volts.
at
EQUIPMEI{T
to have
obtalned. This
MR-1I
lnpedance headset
to the
RECEIVER
Remote
the
1n
list
Type
Receiver
of the banals
a hlgh-lnpedanse output receiver, the Bendlx
sensltlvlty
Control
reEote
(Sectlon
RA-1I
ls 1.6
3
anperes. Receiver
for the type
The
total
unlt ls ldentlcal to the Type RA-1B
control
Unit
dual
such as the
6-5)
Receiver Equlpnent.
is slnllar
4, 5, 6, and the values
used 1n conJunctlon wlth
volume
has
been adalett
to the
plete
(R39,
sensltivlty
Bendlx
Type
Tlrye
current
R40) anal the audio output
to
RA-18 Recelver
enperes and
filament current of
MP-5A24
for the recelver 1s
control
MR-48A
glve
of
lnfornatlon necess-
the tunlng
is required
power
Recelver ex-
Type
the
(R41,
R42)
except for
conponents.
the
tlrye
supply
Type RA-
RA-1I
used.
when
The
callbrated end
The
Bendlx Type
Recelver
An
additional
essary
2.
4-l
the
Ilrlnclple
_ternedlate
RA-18
neans
the
slgnal
whlch
haslts
when
DESCR
.
ELECTR ICAL
Type
Recelver,
of
a varlable
fixed
ls
carry
li.nlts
Band
Band
Band
Band
Band
Band
parts
referrlng
. .
1
aaaaaaaaaao.a
2
3
aaaaaaaaaaaa-
4
5
6
UR-1J
allats and
ltst
to the Type RA-
I PT I ON
THEoRY
RA-18 Recelver
involves
raalio
amplifler
aletected
the
the
frequency,
thls
tuning
frequency.
or rectifled
aleslred
of each band are
. .
. .
Remote Controt
dlal nask rnarked to correspond
(see
follows conventlonal
use
of a
frequency
control
intelligence
. . o . .
.
Unit used ln
sectlon
flxed frequency
hence
After
in the second d.etector,
6-6)
lJ
the tern
is
1630 Kcs.
and
passlng
or
Recefver.
are
glven
.150 to
.
.315 to
.680 to
2.500
5.000
10.000
has
been
anpllfler,
anpllfier.
IF
subsequently
through
messager are etipllfled
belorv:
1.500
to
to
to
conJunction with
ad d.ed. to
superhe
All
desired
the
5. O0O me.
10.000
20.000
with the recelver narkings.
rod.yne alesign.
te
heteroalyned
rF
and
.315
mc.
.
680 mc.
mc.
.
mc
.
mc
the
glve
usually tuned
In
signals
anprlfier,
lnfornatlon
the case
are
or converted.
tbe aud.io
and
feat
Type RA-l.i
nec-
The
basic
to
sone
of.the
tuned. by
the
converted
conponents,
lnto head
1n-
lype
to
Poge 5
f,elephones.
The three naln
transforner,
their associated
and
malntain
ator
tuned
1630, or
To
a constant.
frequencles.
to
1000
2630
lllustrate
tuned to an
flrst detector,
the
anat
incoming slgnal of
tunlng condensers
heteroallme osclllator)
lnd.uctances
dlfference of 1630
Thus, for a
Kcs enat the
heteroalyne osclllator
Kcs.
the
conpLete
the inconlng slgnal
fier tube and its e.ssociateal
of other
iector wllt
osclllator,
frequencies
fr:equencles
diffelence
new frequencies
at audlo
. The
1st IF
plus
antt anpllfieal,
frequencies
also have injected
nhlch
wlll
ln actditlon
between,
frequencles
four
frequencies
anpllfler,
ancl ninus
is
a few kllocycles.
whlle the other
tion and aloplificatlon
associated IF
filters.
wlll be anplifleat
will have a
appear in
to the
and the sun of the
phenonenon
a
when two tones of
(1000,
which is tuned
process
anal
1000 Kcs
operation,
1000
Kcs.
tuned input
into it e
frequency of
the
output
initlal
heterod.yning
of
2630, 1630
by
a
consequently,
three are
is carrled on
(antenna
are
coupllng
gangeal
capacLtles
between
Kcs
signal,
the
assune,
passlng
In
w111
then
antl output
only
second
slightly
voltage orlginating
2630 Kcs,
flrst aletector.
the
of
frequenciesr
orlginat
frequencies.
whlch
different
and 3630 Kcs)
filter network
the
reJected,
further
transfornerst
together
so chosen
are
signal anal
the
RF anpl.lfler
for uni-control
as to
anil
1s autonatlcalLS'
exanple,
for
fron
the
be aspllfied
that
antenna
through
transforners;
not at
or
and the
resultant
There
nanely:
1630 and
The
is
pltch
slnllar
are
to the
sounded.
are fed to
to a band
1630 Kcs
1-e.,
in
not anpllflecl'
the
conpriseat
component
znal
IF
RF anp1lf1er
autoloatlcally
heterodyne
detector 8're
lst
to 1000
5"3
receiver
-the
to
the
where&s,
1n
the
The flrst
all.
of these
wlll
3630 Kcs,
appearance
beat obtalned
sinultaneously.
lnput
the
anpllfier
tunin8,
oscill-
plus
l-5
the
gricl
RF
of
ampll-
signals
de-
heterodyne
two
two new
be
the
these
of
the
of
Kcs,
1630
of
ls selected
This
selec-
wlth
1ts
Slnultaneously
ma5'be applled
age
capacltor,
fed lnto
anrt
signal
component
the
dlode w111
will
stgnal
ttioale clrcult
wlth the slgnal
I kilocycle.
at
the autlio an?ltfier
the d.escrlption
oodulated
thi.s case,
continuous
the amplltude noatulatlon
the audio slgnal
Autonatlc volune
tector
tube.
by thlq dlode,
the control
with the 1630-Kcs IF
to thecontrol
These two voltages are
the slgnal
then contain
be flltereal out
dlode, or znd
This produces an audible
clrcults antl
above is
waves are belng
which is hearal
control is obf,alnetl
portlon
A
sultably
grltl
circults
tubes through decoupling
correspondlng
are transnitted
sensitivity of
or
vice versa,
level nay be
deternlnes
cianges of rectifleal
the
to
the receiver
thus
nalntainlng-thb
aauusted by the
the A!'
voltage applieat
grltl
anpllfleal,
allode section of
tr,{o frequencies
by the res
the
and
IF
detector.
fecl to the
is
for t:Dicat reception
of
ln the output.
the 1630-Kcs
of
filtered by a res
of the
fitters.
RF ampllfler,
Varia,tions of
voltage
above
naned control
when the lncornlng
output
potentloneter
to the
signal
of the
voltage,
znd
IF
passed
Znd
the
3261 Kcs
ist ance-capacitance
filter
whlch
The signal
beat
frequency
head
of
recelved,
the
the carrier
from
outtr
the second
ut fron
is t ance-
capac
1st
inconlng
lnthe
gr1d6
at
AVC aliode
Lntt
a substantlally
sectlon
grlal
the output
of
a 1631-Kcs
anplifier
through
detector
and
couples
feetL
to the
signal
telephones'
unmodrrla.tetl
CW
oscillator
auttible
an
at
ttiotte sectlon
2nat
tbe
lt ance
detector,
serve
slgnal
of
increases
the
CW
tube through
f1nal
the
tube.
The output
1 kllocl'cle.
filter
znd
the
IF
AF ampllfler
rYhich
(CI!)
is shut
frequency
ampllfler
IF
filter, and
and 1st IF
slgnal
intensity
clrcult.
to reduce
1n amplltude,
constant
tluaL volune
power
tube.
oscillator
a coupllng
fllters,
IF
The
associat€d
amplifier
rYil1
passes through
signels.
Off
produces
the 2nd ale-
1n
rectifieal
ls
a'pplie'l
aBpliflef
result
.fhese
varlatlons
the overall
Ievel.
control
volt-
the
of
higher
with
tube
llhen
.- In
galn
anal
This
whlch
be
to
ln
Page
6
l[anual
thus substant1ally
volule 1s
the IR
Rtr'
amplifler:, lst
.Yolune
then
drop
control
accoEpl.Lsheal
across
ls obtalneat
groundlng
a nanually
detector
the
by
replaclng
operateal
and lst
ty
settlng
control
fF a^EDllfler
voltage
the AVC
control
the AVC
froB
voltage
whlch
tubes.
varles
sryltch
the
AVC
varlatlon
the
ln the off
dtode.
wlth that fron
cathoate
posltlon,
control
blas
on
of
the
F
t
I
I
l-
F
I
f
l
I
I
I
2-2,
2-2-t.
viewlng lt
ing
DF, and
switch
DF,
connected
&t the rlght
the condenser
proJectlng
gear
receiver.
-turn
located to
has
successlon
na.tlc
0FF-0N, the
Hl,
Eotor-flrter
eote
p1n
plate
secondary
control
swl_tch (sg)
d1al
:l:^:tfl:
w,rcn
ln
2-2-2.
^.The
flnder
Thls
ated
aupllf1er
qge
ated
V3
The
^
frequency
This
tuned
assoclated
CIRCUIT
PAIIEL
the front
posts
post
S16 whlch
.trailing
arrangement
dr1ve6
the
external
volume
I
slx-contact
control
Jeck
a black
The
then
trlDner
(nlxer
terElnals
voltage
hlghslde
(R39-R40).
nssk
norc
RF
input
anpl1fler;
energy
trl@er
energy
goes
stage)
output
than
heterod.yne
eircults
froru
for
to the
gear
' the
the
fron
'
are
""i t-h-e_
Enecover
wrlnkl
AritPLtFtER
tube
padder
DETAILS
AltD
CoilTRoL8
panel
antenna TA
the
control
power
unlt
unit.
energy
i8 fett
cond,ensers,
fron
to
condensers.
of
of the
the
front,
connectlng
G
to ground.
pernits
blndlng
of the
can
TUNiN0 control
rlght
bus,
at
observed.
vr,
the
.
the
the
mounted.ln
antenna
be
case,
that pernlts
gang
of the
knob
left
e-enamet
osclir*to"
to
switch
swltch
plug
and an
Berow
used
a+
of the
To
the
top
-dia.r
1n
CtRcutTs
is taken
cholce
lnto
the
whlch
tuneal
heterodyns
frequency
and.
trlmmer
receiver
one
the
antenna
rnnedlatery
changlng
or fixear
?osts.
swltch.
a.dJusteat
havlng
tunlng
narked
rlght,
receptacle
elght-contact
for
connects
output
the
center
A
port.
pra.ce,
ofany
the
located.
tuned.
ls a
an externar
the
d.rlves
condenser
tunlng
BAND
sg,
S11
marked
and
to the
testtng,
teft
pllot
pltot
The
a.nd.
aIl
fron
one
tuned
antenne
6K?0
clrcults
The
slgnat
osclllator
of
the
circuit
the
OSCiIlator
cond.ensers.
bears all
nay note,
post
to
to the
the receiver
antenna FA,
The
antenna
By
turnlng
wlth
a screw
rnecha,nlca.l
preclsionr'
a
(c1.1,
contror
sEr,EcroR.
are
the telephone
narked
to
transforner.
of the
of the panel
llght iL1
narklngs
a flxed
1n the
a,v.c.
potVER
plg
that
plug
rlgh-
G
ts ttre
the
heater
volune
l1ghts
c.se
source
antenna,
rn trre nF
desired
end.
antenna,
1s had
Al{Tenna
circult
triple-grlat
ls then
consists
the
controls
ln
the.uppeir
A,
Dlrection
rlght
lnput for
atependlng
conpensatlng
the
drlver.
krob
cLrcult,
slgnar,
ns.rked
llnkage
spr ing-r.oad.ed,
c1.2
hai
i
slrnllarly
Arong
0FF-0N,
OFF_ON,
receives
receptacle
of the
voltage
rn the
ls
ls enclosed.
nay be
front panel
on the panel
clrcult
1s
shlelal
lntrod.uced
of a
shield
the
Jack
that
band
coEr[on
control
the
chansed
a
tralring
by
ope,ratlon
co1ls
shlelal
then
RF
anptlfler,
can,
tuned
1s
6K7G
c&n,
requlred
left hsnd
Flnder
of these
use wlth
upon whlch
condenser-cg1,
sprrng dust
Below
ruNrNG.
of a
atto
botton
J1, narked.
the clv
the
pll
terlal.nal,
bus
u?per
1s the
port
Ln a
can.
fed
lnto
lnJected
coils
the antenna
renote
ct.g).
arrangeal
swltch
operates
power
whlch
serector gear
and
rlght
through
sEall refrector
by
unfastenlng
of the
are
engreved.
antenna,
Ll to
lnto
L? to
bhe
1630
osclllator
for
tts
operatlon.
corner,
(1f
the rotary
1s
a directlon
type
cover to
rt contalns
control
worn
The
of
ihe rront
pHotiES,
s10,
the
cabre
connects
B+
auDlo
corner
LOCAI_REI{0TE
whlch
recelver
of the
r.6
anal thelr
the
ra.atlo
th16
Lrp and. therr
kllocycles
into the
L13
a'pllfler
flrst
tube
to
three
us ett) to
of antenna is
.ls
one
swltch
unlt to
gear
BAND
nechanlsn,
paner,
the
narkeal
srarting
fron
connects
connects
or
ANTENNA.SWITCH,
L18 and
the
to
c.se
ls the
the
rwo
are flnished
a dlrectlon
frequency
aletector
hlgher
mlxer
VZ
blnd-
post
antenna
flnd.er
rocated
s1de,
is a
a
bevel-
the
whlch
sELEcroR
tbe re-
u""
trensfer
d1al
case
a6soc1-
essocl_
and.
thls
&uto_
c.w.
relay
aryna-
-fo...
to
the
to
the
vol,li\iil
and
to
screws
vort-
tube
ln
stage.
the
thelr
in
rn
Poge
7
I
Frequency converslon lg acconpllsheat
amptlfled
..Ietected ln the
slgnal enal
fj.r6t tletector
Lo the lnternediate
rwo
sep'arate
control
luces the undesirable
a n1nlnun.
transforner.
iF
?-2-5.
output
iorner
Ftl to tbe flrst lnternedl8.te
lL1 belng tuneal
all
other
lnother tuned
into the second
Provlsion
;
inuous
The
tuneal
AMPilFtER CIRCUTTS
lF
the flrst aletector
of
to 1630
frequencles.
IF
IF
has been nacle 1n the
wave beat frequency osclLlator
lK?G operating et
coLI
The
and 1ts a6soclateal condensers located
L27
seconcl lnterrDeallate
enal a tuned clrcult
V5;
t,ube
whenever
inpfiffeA ln the tube
to the seconal
aletector tube
the output of the
(nlxer)
frequency of 1690 trc6.
grids
coupllng
clrcults
whlch
effects
Ftl
are
couprlse
(nlxer)
passes
Kcs
After eopllflcatlon 1n
transforner
a.!rp1lf1er tube
FL2; that further
y5.
IF
very
low
voltage.
frequency stage
Ff,3. The
the
beet
V5;
output
frequency osellletor
the slgn&I
V6. Transforner
undesireal frequencles.
by the
heterottyne
heteroctyne.osc1llator
whose outlut
tube
V3
The flist
shlettteal
fron
each other;
between the osclllator
a conventlonel
tube
frequency
signal.
Vg 18
energy
fed
&Bpllfler
of
tube
the
attenuates
transforDer
1CW
This
FIlz to
Osc.).
oscillator
The CW osclllator
in the
of the IF
aDpllfleat
of
V4
cons16t6
ls
tube
lsthen
feal through
FL3 further
process,
aletector
1630 Kes,
through
tube
thle
frequency
V4 the
uniles ired
couple
tuned
ls
BFO shlelal
CW,
amptlfler
in the'second
VB
16
the
usedr
tuneil IF
attenuates
the tune'l
are slt0uLtaneousIy
ls
clrcult
tube
use
s lgnal
anal
FL1
Vg
this tube
of
clrcults
(6L7G)
doubLe-tunealt
the
V4.
slgnal
tunefl
The
anal
IF
trensforner
attenuates
feal through
1s
frequencles,
the
tube
16$1
of
V8
Kcs
the output
to
csn.
IF
V5
suplifler
is also
tube
its outlut
transforEer
61gnal6
'and
tuneal
has
re-
to
trens-
conls
the
by
(6K7G)
Fl3
any
of
a
t-h:'."11:.1i#tiT::t'.[:
(6R7c)
".
Iif1er, a.nal autonatlc
tn the diode
cult
dllagran).
the radio frequency conponent aJld is
of
tifleal
vary
tector
ing thegain and
The.
(6K60),
plate
2-2-5. SEltStTlVlTY
by rotating the
across
voltage alellvereal
lowering the recelver 6en61tlv1ty.
a voltage ls developed
the
tube.
voltage
the blas
w111 cause &
output of
and the auallo output
circult of the
$hen u6lng
the secondery
When AVC
portion
The
autllo
Thls
tteveloped
the tubes
on
ectlng to hold the slgna1
the d.etector
AVC the receiver'sensitlvlty
atual volune contr.ol
not used the
is
volune control
the tube and
of
across the reslstors
voltage developed across
triode sectlon ampllfles
across
V1, V3
change
tube V?.
C0ltTR0L CIRCUITS
of the output
to the headphone
ln
v6
the reslstors
anet
DC
the
ls
for heatlphones
veriable reslstor
used &s
rs
tube.
because of
then applieal
V4. Any
blas
anplified ln
(R39
transforrner
jacks.
The
the
voltage of the
level at
is obtained
flxeat.
ls
antt R40).
a conblne.r
slgnat
the
R23 and R24,
reslstor
to the
audlo
R23 anct
change 1n
the aletector
the eudio output
T1 to
R39 changes thb
lnput
cur:rent
R24 1s b5{tassed
gritl
frequency
R24
slgngl
RF anal IF
fron
The recelver output
The' potentloneter
provltte
derecror,
fron
flow
is
a mearrs
FLA
in the
(see
the
of
slgnal
filtered and
strength
tubes
to e constant
anplifler
transforner
cathotle
au.rlo
rectlfleal
1s
dlode cir-
schen&tj.c
the
to ellninate
trlode sectlon
,
at
thus
T1
16
ls
R4O
varying
of
bias
amp-
rec-
The
used to
the
linlt-
value.
tube
ln
vbrled
shunted
thus
de-
v?
the
the
2-3,
2-3-1.
The
P()I{ER SUPPLY
GEt{ERAL,
Type
RA-18 Recelver
t2-
0R
2r}-V0LT
0PERATl0ll
can be operated
Page
I
from
eltlier
a 12- or
z+-voLb
storage
battery'suppJ.y.
lz-vort
a.
unlt; also,
1 and 2
7
?A-\olt
B'
Unlti also,
ternlnals
.
'rt
operatlon
Junper
The schenatlc
operatlon
po$er
the
leadof the
The Type
either 12Units are
Each
unlt
conponent
operatlon
on the
Eust
and 8 nust'-be
operatlon
on the
p
and
is
not necessa,ry.
as the
ls renoveil
Diagran,
the
fuse
supply.
dynamotor
MR-18 Renote
or 24-volt
ruggedly
1s
nounted
parts
requlred
requlres
nunbered
be connected,
connected.
requlres
nunbered
g
6hall
to
(tririplng
fron
connectlons
be
change
reslstors
Flgure
1s a lo-aEpere,
Fo,"
2+/29-'olt
output..
thls
Control
lnstallatlons.
constructed
secureLy
for
on
lts
the,use
ternlna,r
ternlnars
the
use.of
of
board l-ocated.
3, 4.and
termlnal
connected..
pllot
llghts
R43-.3
6, ? and
15,
shoes the
26-volt
operatl0n the
fuse 1s
Unlt-ttoes not
The Typi:
nachlnes
top of a
proper
destgned
chassis
operatlon.
Type
a
Type
a
Uoara
MP-5Azit
fdcated.
rhen
lip-5
6
nust
cha,ngrng
anal R4g.4
6 of the
termlnar
roca,tlons
Llttelfuie
fuse
a one_elghth
have
to
be
Hp-58
especially
thai
(1z-volt)
B
under
the.chassls, terninars
be
connected.,
(fz4-voft)
under
i""ltn
fron
the
the
lp-volt
board.
of the fuse.
locsted ln
ls l0cited
the
1n
anpere, 800_volt
chented when
and
ui-ama
for
eviatton
contains
atl
Dynanot or-Filt er
ter'lnals 6,
Dynamotor-Fl1
chassls
only
ter
the
to zir-vort
cLrcutt
For
prinary
the htgh
nhen
!p/r4-vo]'t
the
lead
vortsge
Littelfuse.
1t
Lsr used.
with
ov".."1"i-riit"i
servlce.
the
of
necessary
of
2-3-2.
At
venlent
upper
stora€ie
the
use
EXTERItAL
one
connectl.n
left
battery.
receiver.
*1th Bendlx
provlales
can.
b€
lnstarleat
swltches
A
PROTECTIVE
lble
lnspeetion
2-[
2-l}-
2:t$-
adverse
stand
course
ls
from
.
c0]tSTRUCT
l.
RECE
l-
t
The
Type
servrce
a,ny
of
selected
C0[1{ECT
end
of the
of the
prug
receptacle
The
The
lciwer
Dlrectlon
potentlar.s
to
operage
the
or replacement
indepenalent
FUSE
terml.nal
l0N
IVER
OETIERAL
RA-18
degree
normal
to wlthstand
Recelver
condltlons,
of
fllght
t0xs
fllter
box
power
upper
rlght
Flnder
-any
for
provlde
(F1),
1S
end
by
is
vlbiatlon,
operatlon.
corroslon.
are
cables
pL?
recelves
right
plug
plug
anprifr.ers.
of
the
as nany
of the
mounted
of
the
removlng
aresrgned.
as
arr.of
tenperature
four
plug
lncldental
the
recepta.cre
receptecte
varlous
Bendlx
posltlons
recelver
in'the
dynamotor
d]'namotor
the
small
for
d.ependable
1ts conponent
The
netar
receptacles
to the
low vortage
prA
rJcerves
pr5
supplles
Trre
rower
rnterphone
a6 d.eslred.
0N_oFF swltch.
so
mountlng
box,
knob provld,ed
operatlon
parts
o" fr.-fafty
fron
whlch
the elutpnent
that
provr.de
use of-
lnput
potenttats
tett
"y"i"r"-.
The
that
it
and
ere
constructear
change
for
the dynruoto".
fron
the
the
power
cable fronr
suitabre
prug
reeeptacle
These
lnterphone
readily
is
may
for
und.er
removed,
be
this
severe
purpose.
encountered
ls f&brrcated
the
con_
The
airplane
for
pL6
systens
0N-0FF
access_
for
and
to wlth-
the
ln
2-4-t-2.
The
ffl,rront
repracenent
flexlbLe
screws,
thir'l
TYPE
cha,ssls-case
panel
tuning
tyo
1s
nounted
assocla'ted
0F
enabllng
of
tubes
of
which
trlnner
C0lt8TRUCTt0il
for'
of
constructlon
the
chassls
wlthout
shafts.
at
Ere
the
The
nounted.
center
anar paard.er
to
the
inconvenlence
chassls
1s held
along
of thJ
condensers
Poge
has
been
used..
be {lthalrawn
of dlsconnectlng
place
ln
the top
botton
are
9
eclge
ed.ge. Arl
nounted 1n arrulnum
fron
of
Arr
contrors
1ts case for
in
its
case
the front
tuning
ere
lnspectlon
the
cabres
by
panel,
ccills
shlelal
rocated.
or the
three
and,
a,nd. therr
cans,
on
or
thunb
the
(see
Figure
switeh
sistors
Jrractiee
2.''5.
2-5-
The
with
3.)
sections
One
a.nd
bypass
facil.ltates
REMOTE
t. TypE
Type
the
llR-
Tyae
18
RA-
requlrenents.
flexible
flttings'
receptacle
2-5-2.
The
found
renote
tunlng
uldrfay
(PL2)
0EscRtPTt0l{
Type
on
NR-
the Type
transfer
a telephone jack
c.il.
the
top
,'nd
the
renoveble
SFI'FCT0R
responding
turning
MR-18
nected
swltch
tlons;
levelswlteh
0N-0rF
right
center
dial
of the
of
Dask,
recelver.
reflector.
crank
recelver
operating
the
Remote
to the
sg.
a llstener
in his phones
the
at
swttch
the
control
LocAr-REltoTE
control
output
Headphones
locatlon
can
1s
used.
whlch
are turned
condensers
repracement
CONTROL
itR-
tB
REH0TE
Renote
18
All
shaft,
externar
Controjl
Aircraft
and
between
to whlch
oF c0ilTnoIs
18
fts66trs
RA-
swttch
J2 marked
(sl3),
power
uR- 18
seen
Thls
through
d1al
handles.
drlves.
at the.locetlon
controi
18
Recefve"
sg.
sn'ltch
p&ner
port
Near
These
ls transferrecl
unlt
of the
may
by
aaljustnent
ls ln the
for
are
C0ilTROL
Uni.tr,
Recelver,
connectlons
flexlble
the
flextble
the
receiver
rn the
:_H0_NE!,
A.v.c.
1s a
1s the
the
diar
18
the
craaks
s$ltch
are
be
located
so arranged.
ieceiver
used.
ON
each
by
of
sta.ge.
the
BAND
soldered
parts
to
and
UiltT
(Flgure
a.nal
are
banal
(Flgure
prrril
upper
dlrectly
ox-onn
second
1llun1nated
right
fron
slnurtaneousLy
whlch
of the vorume
posltlon.
selector
shaft
control
1) contalns
except
reft'corner
swtlcn
telephone
dlal port
port,
have
edge
connect
the
on the
that
regard.less
does
The
SELECTOR
lugs
provldes
1)
ls aleslgned
r
1s
constructed
on the
rlght
shait
coupll.ngs
cable
the
antenna
berow
ls the
(slg),
narked
the
by
a dlar
the
of
through
recelver
recelver.
the
the positlon
of
at
not have
contror,
tuned
mounted
clrcuits
larob.
rlgid
to
end.
areheld
16 the
connects.
arl
of
swltch
of the
voLUME
po}nEn
Jack
Jg,
.FnEQUEt{cx.
sa.me
scares
rlght
panel
a"e the
mechanical
to
the renote
The
pH0NE
the
Jacks
recerver
control
are
connected,
Whenever
on bakellte
support.
to work
neet
possible,
boards;
1n conJunctlon
the
same
alr couprings
place
1n
elght-contact
the
operarlng
sls
anat
renote
contror paner
contror
ot_onr swrtch
narkeal
pg0NEs.
rhe
and band.
DLz
th&t
ls
TUNTNo
llnkage to
control
circults
J2 and
of
and
of the Type
J3 are eon-
the
IocAr,-REMorE
renote
Eay regurate
p"ourortrg
that
this
servlce
for
by
threaded
terrdlnal
contrors
the
local-
(R41-Raz);
(sla).
rn the
tuning
dial
Earklngs
housed
1n
and BAND
the
cor-
unit by
roca-
the
audlo
the
AVC
to
re-
the
ls
To
as
a
3.
3-t. cEilERAI
electrlcal
is
3-t-t.
A'
II'ISTALLAT
Prlor
.glven
parts
properly
to
the
lnspectlon
below3
l,tEcltAlilcAL
Receiver
have
If
dust.
broken
the
recelver
A hand
pressure
dellcate
that
'oay
to
Unlt-
ls
parts.
be
deternlne
seated
iltsTALLATloil
lnstallat1on
or become
obJectlonable
caused
all controls
I ON
of
arr
AilD VTSUAL
Re'ove
loose
appears
bellows
Carefully
by
1f any
and
naklng
through
thelr
tt{spEcTtoil
of
any equipnent
parts
mSPECTl0ll
the
dusiy,
nay be
foreign
hd.ve
good
entlre
shourd be
recelver
and check
dry
usear for
as
it nay
lnspect
Eaterlals,
become
contacts
a
ned.e.
fr
or' 1ts case..
all ceraElc.parts
con?ressed.
thls
purpose:
lmpose.undue
aIi exposetl
or nispldcenent
roose,
1n their
range
Page
of notion,
10
thorough
a
ayplcal
alr
nay
stralns
connectlons
especlaily
respectlve
notlng
visuar.
and., if
lnspectlon procedure
Observe whether
for,
iracks
be used.
The
use
on sone
for
parts.
of
see
or
to blow
of extreme high
of the more
short-c1rcults
ir
arr tubes
sockets.
atry lrregularltles
possibre,
any wlres
bre&kage.
out tits
.Feel
alt
are
Uanlpulate
re-
'gulring
ed lock
after
have
sl
Renote
B.
unit
c.
Dyna.uo tor-F1lter
nent
ascertalnlng
penetrated
ides.
ls
of
protectlve
the
of
1liar
in
with
their
p1ugs,
correctlon.
screws.
lnto their respectrve
Control
Un1t. The
sinilar to
unlt. The
contacts'
fuse.
correct
should make good.
value.
its EechanlsD..
respectrve
and by
the threaded
The
recelver
The
case
nust be
that all the
general
that
outLined for the reeeiver
dynamotor
pttted
or corroded.
The dyna.notor
'(See
receptacres
collars
nust be
locked
netalllc
holes
procedure
rela.y
contacts,
contacts
should not
Sec. S-i-f.)
by the
small
ln the case
locked
enal
plvots
1n
.safety
on the rubbershock
before
of lnspectlon
un1t.
should
ln lts
be
and
horder,
be
taken
All
iuproper
cables
sprlng
of the
case
1ts
wlred
trying
checked.
by
on lts
to
the renote
of
for lnproper align-
sprlng
also,
apart !y anyone
nust be f1rm1y tocked
tlps
on all electrlcar cabre
mechanlca,l
the three
knurl-
shochount,
absorbers
close the
snap-
control
tension. The
the fuse Bust be
not fam-
cables.
3-I-2.
After
should
installati.on
A.
B.
c.
D.
E.
F.
c.
pensating
The
H.
Turn
Vary
ELECTRICAL
a.ll units
be
tested
Set the
Turn
P0WER
Plug
Adjust
Turn
Turn
operate TUNTNG
an insul&ted
telephone
a
VOLUME
BAND
CIV
cover
AVC
the
PERFORMAIICE
have
for
performance
L0CAI-REM0TE
switch
control
SEr,ECT0R control
switch
condenser
Eust be turned
switch'to
to
control
serewdriver,
VoLUI{E
been
electrical
on the receiver
headset
0FF.
c81
0N
control
inspected
performance.
checks .
switch to
into PHONES
to
maxlmum.
untll a signal
should
adJust
to close
recei,ver
on
LOCAL.
be
condenser
and note
and
to
0N.
jack
to
ls
adJusteal.
the
adjustment openlng.
properly
are
The
followlng
receiver.
on
band..
any
heard,
untll maxlnun
Turn
at which
the
lf snooth reduction
connected,
procedure
tlme the
smalr
snap cover
signal
outputls
of volune
the
equipnent
typical
is
antenna
com-
and,
wlth
obtained..
1s obtained.
of
Turn
smooth
K.
Turn
L.
Turn
M.
Check
perly
It
w111
0N,
the
gardless
nanner
at
the
slYltch
trols.
Tune
the.
Avc swltch
reduction
the CW
LOCAL--REM0TE
remote
aligned;
be
V0LUME
of
so that,
renote
to
0N. This
The
ln
several
switch to
d.ial
noted.
control
posltlon
the
1f the
positlon
controls
statlons
to
oFF and
of volume
0N and
swi
against the receiver
readings
all
that
at elther remote or recelver
functions to control.
of LOGAL,-REI{OTE swltch. The
local
nay
may be
should be checked to
ls obteined.
note
tch to
operator should
control the volune
done
on
REMOTE
should
without affecting
e&ch
band at both the local
a.ga1n vary
beat
1f
be
Page 11
is heard.
and repeat
dial,
identical.
the head.phone
have
see if
the voLUuE
all checks
making
positlons,
alrcults
control
ln hts headphones
any of
they
operate
control
in
the head.Dhones.
certain
volume at its
the recelver,
of
the
locsl
ln thls
anat renote positlons
while notlns
in thls
f,hat they
wlth
are arrenged
by
turnlng
operator's
position.
the
AVC switch
posltlon
mat]ner.
are
1n
the
tfre
lf
pro-
re-
this
pilot
IVC
con-
while
making
The above checks w111 lndleate
equipnent. To check
j.n
if an5' lngs.lerence ls lntroduced. Repeat thls
b at
no interference
motors or
the above checks to assure
overall
any band
tery-charglng
and
turn airplanets notors up
generator-field
originates 1n the
generators,
bonding anat shleldlng trust
correct
proper
perfornance
swltch with notors
generator.
opers.tlon
connection
the lnstel-letion,
of
to o.t least
If
the equipnent.
of
and operation
1200
check
&nJ'
be exarined
on each band.
turnlng
interference
the recelvlng
of
tune in a
RPM, noting in
1200
RPII to be sure ths,t
is caused
corrected..
and
weak station
heedphones
0perate
by either
the
3-2,
ing
bonded and shield.ed, if satisfactory raalio results
the
by
cesired
bonding and shielding.
alrplane in
clear weather
set at Daxinum, negligible
that r{hlch
well bonded and shj.eldeal cond.ltion, extrenely
be
3-3.
surface
practicable
main tunlng controls
be tal(en to ehoose one that
$ithout striking any
quirenents
receiver should be attached to 1t
ing
gaged
BOND IIIG
Eefore the Type nA-lB Recelver
generator,
ihe ultinate
As
magnltude
the sensitivtty of the receiver, it is necessary 1f
thet
[est
A
obialned by ti:e
LOCATIOH AHD MOUNTING
The receiver shockproof mountlng
&t
brackets on the under side of the cd.se.
on their respective studs and
A}ID SH I ELD I NG
igilltion systen and all electrlcal accessories
sensitivlty of any aircrs,ft
the
of
the
interfering signal be reduced to
to ddtermine the
fllght
when
heard
is
a location in the
lead to the recelver
have been
local
or with the engine turning up at least
atnospheric static is
lvlth the engine not
Tlpe
RA-18 Receiver.
the front
on
other equipnent or
net, and the nounting base
Equlpment ls
interference caused by ignltlon
conpleteness of
sound should
RECEIVING EOUIPMEIIT
OF
airplane that
antenna
panel.
permlts
bl' means of
be audible in the
running.
base
the recelver to
securely
instelled,
receivlng lnstalletion
bonding and
negllglble and the receiver
long
(Figure
hes been chosen for
binding
ll'hen deternlning thls
portion of the airplane.
snapslides associated
The
closed.
the alrcraft
nust
are to be obtained.
noises,
receptio4 of
the lowest
shlelaling would
the airplane
If
distance
10) should
post
vlbrate freely in all
has
been
sna.pslides
posslble
1200
and
RPII on the
telephone
ranges of reception
be attachetl to a
both the
convenient access
locatlon,
permanently
nust all be
englne' charg-
be conpletely
than
proper
ound
will
plane
to the
by
is
1n
the
gn-
is limlted
etc.r rather
weak signals
value by
be: Wtth the
gr
volune control
receivers over
is naintained In a
shortest
care nust
directlons
After these re-
secured,
with the nount-
firnly
v
Tbe T]rpe
such a
Ltudlnal
fl1ght
necting
notor-fitter
the
location selected and the
four
ily avallable tothe
Care
sharp bends wilLberequLred
lng. The
the chosen
to
snapslides
The
reEote control unlt
shoulal
hold the writ in
P-58 or
?osltlon
plane
possiblei
as
cableg
and the
unlt. The
be
renote control ncuntlng
location and the renote control unlt attached to
\'J'-6 Az/t
that the battery leads are kept as short as
of the
provitled
used in locatlng the remote c-ontrol anct recelvei
dynanotor shaft be as
also,
necessity
lilot.
Dlace.
Dynano tor-Filter
consideration shoulal be
for
oceasional
nust be
base
:ot
(FJ.gure
l ter
(Figure
e
rt
nounting
for thls
(Flgure
The
in
plate
dl'nanot or-fi
purpose.
11)
alial nustbeea6lly seen
tbe
nechanicd,l ca.bles
Unlt
near
so
(Flgure
parallel
glven
r€moval
12) should be
unlt
losated that
13) should
to the
attached
by the
used for tuning a4at band
14) shoulat be
posslble,
to the
for inspectlon
pernanentlf fastened in
all controfs
be securely fastened at
it, uslng
alrplane lrille of
placenent
to it by lxeans of
pilot
units so tliat no
locsteal ln
and the
of
the dyna-
of
are read-
when
1n ftight.
the snapslldes
.long-
the con-
the
switch-
3-q
by
to
battery
serted
The
end
other
recelver.
ally
slde
front
CABLE CONNECT
electrical
The
seleetlng
indicate
voltage
in the
Type RA- 13 Recelver ls connected
whlch
of
end is lnserted lnto
by
of
panel
first the battery
thelr
supply llne.
two-contact receptacle
plugs
The Type MR- 1B Renote
the control cable whlch runs
the renote control unit
the recetver.
of
IOI{S
connectlons
polerity. these are connected
into
the six-contact
the
theType
of
cable, fron one
plug
The
slx-contact
Control
to a sinilar elght-contact
RA- 18 Recelver Equipment
the opposite
at
PL7
to the dynanotor
Unit
fron the eiSht-contact
end
base
the
on
receptacle
receptacle
ls conneeted
(Ftgure
which
of
to the termlnals ofthe
end
of
PL4
PLg on the front
proJect
the
of
the clynanotor-filter
through
on
battery
the
the
dynanotor
to the recelver
receptacle PL2 on
receptacle PLl
two
power
paneL
wl.res
8) are
cable 1s ln-
cable,
base; the
nade
narked
storage
unit.
one
of
electric-
the
on
the
the
TUNING and
The
llnked
flexible
and
Before
controls,
the TUNING controls of
SEIECT0R
port for Band 1. The flexlble
the fenale
receiver and
to the conespondlng TUNING
nechanical shafts.
are securely
connecting
the reEote ard loca.l
control
fittings
BAND
held in
ofboth unlts
renote control unit and
SEIECTOR
plaee
the flexible
the reeeiver and
the ends of each
at
controls on
BAID SELECTOR
and
The
ends of
threadeal collars.
by
nechanical
controls Bust
so that
mechanical shafts
the
securing
U. OPERATION
{-I. II{ITIAL TESTS AND ADJUSTMENTS
Prlor to
This
A.
B.
c.
check should include,
test
on each
PHONE reception.
CW recepti-on.
AVC
action.
each
flight the
band to detennine:
Type RA-iB Receiver
from
both
local
the remote control unj.t are
controls on
these shafts
shafts
be set to corrdspondlng
remote controls
lndex
shaft with
llne of
may then
the coupling nuts.
should
remote control
and
terElnate wlth spllne
the TUNING and
to
to read zero.
eacb is in
be connected
proper
the
be
nale couPllngs
cheeked
nechanj,cally
the recel-ver
BAND
posltions.
Set
the center of
by engaging
perforrnance'
for
points,
a
by two
joints
SELECTOR
Set
the BAND
the
the
on
Listening
D.
MVC
action.
E.
V0LUiltE
F.
TUNING.
G.
BAND
H.
I0CAL-REIr|0TE
Any
fluder,
determlned
swltch
'+-2.
A.
AXTENNA
sEr,EcrroN.
other
interphone
on the
pttoilE
Turn
control.
operatlon.
equlpnent
whlch
receiver may
used in
system,
posltl.on
REcEpiloil FRoM THE
.I|NTENNA
SWITCII
sl,lirTcH
to
to TA for use
for use wlth
.FA
connection
etc.,
to
1s
be set
L0CAL
$ith
should
have control
to the correct
aLso
posrTtoil
receiver wlth
of
flxed antenna.
this receiver, such as, a
be checked at
during
positlon.
fl1ght so that L0CAL-REIIIOTE
this tlne.
traltlng
a
antenna,
dlrectLon
nust be
It
turn
Loading...