Radio Engineering Labs. 646 Schematic

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Product Information:
Model:646
Manufacturer:Radio Engineering Labs.

Schematics Content:

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Page 1:

' RADIO E
, \ LII
I \ . SI SHOVVN IN HIGH BAND \
I T T T HEAD END UNI
TO AUDIO 26
2 III ' 2 8 ' I ?
THESL TERMINALS
T _ oN Powell
I 'I Q FRONT P/\N?L
AC FROM _ __ IFCI-IAS
(C)John F . Rider

Page 2:

LIES; INC, MODELS 646, 647, 648
Sic
END UNI I`
F CHASSIS
mess vnnu ,
CHASSIS
NIGNESY GAIN
SUPPLY

Page 3:

REL PAGE 18 3 '
RADIO
0
Z ZOO
vp- zoo
OHM
zoo I ,_ DS: >>.<?~E Z
(C)Jo1m F. Rider (C)J?h" I

Page 4:

1?_4 REL _
MODELS 646,647,648 RADIO ENGINEERING LABS., INC.
0
~\?->>` loud " 8 'Y ___
(C)John F. Rider

Page 5:

RADIO ENGINEERING LABSHNET '
(C)John F. Rider

Page 6:

PAGE 18-6 REL
IMGDETLS 646E47,GE RADIO ENGTNEEETNG LABS., Hwc. '_
CHASSIS TUBE AND TRIHMER LAYQIT

Page 7:

EL PAGE 18-7
'RADIO ENGINEERING LABS., INC. MODELS 646,647,645
These receivers are single superheterodyne units of orthodox circuit and de-
sign. As with all VHF receiving equipment, performance is dependent on cor-
rect installation, particularly the associated antenna and lead-in system.
The nominal impedance at the antenna terminals (marked A >> A) is 150 ohms,
Both 70 and 300 ohm lines may be used here without serious mismatch conse-
quences. Whether or not the ground terminal (marked G) is used depends on
local conditions. Because of uncertainties in this connection and because t
input circuit coupling is fairly tight, the latter is not precisely tracked
the factory. For very weak signals or for technical use at an one frequency,
these circuits may be trimmed up by adjusting 02, for the B8 to 108 bend, and
C1 for the UU to 50 band. These are accessible at the top of the chassis and
are located as shown in the tube layout sketch?
For convenience in tuning and rough measuring the circuits are adjusted so t
hat
one small division of the TUNE meter corresponds to a frequency shift of about
20 kilocycles, and so that the steps of the RF GAIN control are roughly ten
l each. Indications on the SIGNAL meter are approximately linear. Both these
-meters may be supplemented externally by use of the connections on the rear ter-
minal board. The TUNE meter is 25=O>>25 microamperes, and the SIGNAL is 0-l
To use external meters, remove the strap between terminals U and 5 and the
ground bus from terminal 5, then connect the TUNE meter between terminals 5 and
1 (ground) and the SIGNAL meter between terminal M and 1. If only one of these
meters are connected externally, the terminal for the second meter must be c
nected to terminal 1.
The output of the detector is directly available at the rear st terminals 3
(high) and l (ground). This is at a fairly high impedance and not more than
50 micro-microfarads should be placed across this pair unless C33 (part of t
standard de-emphasis network) is reduced correspondingly. The audio amplifi
may be used by connecting to 2 (high) and 1 (ground). The terminals present
to A0 about one megohm and 30 micro-microfarads. For the 6H6, about 2.0 vol
R.M.S. at these terminals gives full output of the audio amplifier.
The 6h6 and ?b? receivers are designed for operation at 115 volts. They sho
not be operated permanently on lines higher than 125 volts. The 6b8 receive
requires at least 5.8 volts DC at the indicated terminals. They are connect
for negative ground. If the vehicle has a positive ground system the vibrat
must be reoriented according to the legend on the top of the Vibrapacks.
The maximum audio output of the 6b6 receiver is ten watts into either 500 o
8 ohms (mismatch up to 2 to 1 here is not generally aurally serious). The max-
imum output of the 6b7 receiver is 4 18 DBM into 600 or 150 ohms. This receiver
is connected for 600 ohm load; to use with 150 ohm load the output transform
should be restrapped by replaceing strap from 5 to 6 by a strap from U to 6
and another from 5 to 7. The maximum audio output of the 6U8 receiver is U
watts into 6 ohms.
(C)John F. Rider

Page 8:

18-8 REL
EHODEIS 6`4`6>> 5&7.>> 648 RADIO ENGINEERIN G
SYMBOL
| REF. DESCRIPTION DESCRIPTION
R Resistor, 220,000 ohms V3 T?P? 7597 tube
1 10%, 1/2 van vu)
I 1O$, 1/2 watt $23 s""? "? '5
10$, 1/2 watt 7
R10 esistor 10 0 o s vs Type YAG tube
| 105' 1/2 "W xa same as X1
Hi? Resistor, 560 ohms, i X3 Same as xl
'log' 1/2 "att Xk Same as X1
mu 3, 1/2R~g@?? x6 same as X1
e as X1 Sam a X1
R15 same as mo xg sam; B: X1
R16 R??i?t?r? EPO ?hm?'i X9 Miniature, bayonet
R17 ?gf. 1/?R;;tf X1 gipe socket
R18 Same as R10 X11 Sam; 5; X3
R19 Resistor, 100000 ohms, X12 Same as xg
i 10%, 1 Watt Z1 Interstage coupl-
i 10%, 1 Wait Z2 Interstage coupl-
I R?1 Same as R23 ing unit, 10.7 mc.
RQ2 R, i t _100o ohm , Z
RP3 iesiseor, 6sooo mms, ing units 10 7 mc
~1o%? 1/2 watt 26 DIgc:?m?'atO'7amc'
R95 Same as RED bls itnloor seem'
1 10%, 1/2 wan
REI' Same as R26
RPS Resistor, NY0,000 ohms,
j 10%, 1/2 watt
4 10%, 1/P watt
1 S3 Switch, single pole,
I single throw, rotary
V1 Tyne YF8 tube
(C)John F. Rider

Page 9:

RAIjIO ENGINEERING LABS., INC. MOUEIE 645>>547>>54_3*
cm. 6u6, 6117, and ?ua FM Imcsrmn PARTS LIST Fon nr .mn IF crmssrs.
scsrxrmrc WIRING DIAGRAM nwc. s-615.
SYMBOL SYMBOL
] gm. DESCRIPTION nm. DESCRIPTION
Cl Capacitor, glass, variable C32 Same as ce
C1A Capacitor, ceramic 27 mmfd. f}0%, 500 V.D.C.W.
C2 Same as C1 031+ Same as C18
CZA Capacitor, ceramic U-.7 C35 Capacitor, 1.0 mmfd.
C3 Capacitor, 500 mmfd, '_f_20$, Il Pilot light, miniature
500 V.D.C.W. bayonet base, 6-8 volts
C5 Same as CM I2)
C6 Capacitor, U7 mmfd.. f1O$, I3) Same as I1
C7 Same as C1
| C7A Capacitor, ceramic 27 mrnfd. L1) Antenna and first grid
C8 Same as C1 LZ) coil assembly
C9 Same as C11 L3)
C10 Same as Cb
011 capacitor, 22 mmfd. jloi, Lu) Mixer grid can
C12 Same as C1
C13 capacitor, zo mmfa. ilO$, L6) os?111m>r can
C1|+ Same as C3
C15 Same as C11 LB) Choke, 3 microhenries
C17 Same as CL2. L9)
| 018 Capacitor, .005 mfd. L1O) Same ae L8
019) M1 Signal strength meter,
I 020) Same as C18 O-1 m.a.
C21) M2 Tuning meter, 25-O-25
(322) ` R1 Resistor, P4700 ohms f
c23) same as cu 10%, 1 vast
czu) R2 Resistor, 270 ohms 1
1C?, 1/2 watt
I cze) 1093, 1/2 watt
cao) iloi. 1/2 watt
i1O%, 1 watt
(C)John F. Rider

Page 10:

PAGE 1?-10 REL __
MODELS 646,647,648 RADIO ENGINEEENG LABS., INC. _ '_
CAT. 6b6 COM INED AUDIO & POWER SUPPLY \-/
CHASSIS, SCHEMATIC WIRING DIAGRAM DWG. B-655
SYMBOL SYMBOL
REF DESCRIPTION REF DESCRIPTION _
volts D.C. WRG. plug/ R111 Resistor, 200 ohms,
minus 20%. 10 watt, plus/minus 5%
C102 Capacitor, fixed, dry R112 Same as R110
I 25 volts D.C. wkg. plus/minus 10%, 1 watt
103 Same as C102 R110 Resistor, 150,000 ohms,
10h Same as C101 2 watt, plus/minus 10%
105 Same as C101 T101 Transformer, output,
106 Capacitor, fixed, dry Pri. 10,000 ohms GT, 12
50 volts D.C. Wkg. pull windings, balanced
E107 Capacitor, fixed, elec- at high audio frequenc-
volts D.C. Wkg. , operation level 10 watts
volts D.0. Wkg. single phase, Sec. #1,
3109 Capacitor, fixed, elec- 320-0~320 volts RMS at
volts D.G. Wkg. volts at 3 amp. Sec, #3,
0110 Capacitor, fixed, mica 6.3
300 mmfd., plus/minus #0, 6.3 volts C.T, at
20%, 500 volts D.c. wkg. 1.5 amp.
101 Fuse, 2 ampere, 250 volts V101 Tube, Type 7F7
101 Choke, 10 henries, 0.160 V102 Tube, Type 705
|` amps V103 Tube, Same as V102
E101 Resistor, variable, cough V100 Tube, Type 5UUG
taper, standard shaft filled bakelite
R102 Resistor, 220 ohms, 1/2 X102 Same as X101
watt, plus/minus 10%. X103 Same as X101
I watt, plus/minus 10% filled bakelite
E100 Same as Rl03_ X105 Fuse holder, molded
05 Resistor, 180,000 ohms, black bakelite, finger
V 06 Same as R105
O8 Same as B107
(C)John F. Rider

Page 11:

RISUTO ENGINEERING LABS., INC ,MQDEB 6`4'6,6I7_,
CAT. 6147 COMBINED AUDIO & POWER SUPPLY
CHASSIS: SCHEMATIC WIRING DIAGRAM DWG. 3-702
SYMBOL SYMBOL I
REIC DESCRIPTION BEF DESCRIPTION
C100 ~ Capacitor, .05 mfd., B109 Same as B105
~ 500 v.D.C.W. R110 Resistor, 27,000 Ohms
0101 Capacitor, Electrol- 1105, 1/2 watt
ytic 50 mfd., 25v. R111 Resistor, 1500 ohms
D.G.w. f_1O$, 1 watt
C102 Same as C100 B112 Resistor, 100,000
C103 same as C100 ohms, _10?, 2 watts
6oo v. 1>.c.w. ohm , i10$, 1/2 watt
ytic, dual 20 mfd. 115 volts, 50-60
M50 v. D.C.w. cycles, single phase,
C106 Part of C105 Sec. #1, 310-0-310
0107 Capacitor, e1ectro1>> volts MS at 0.1 amp.,
| ytic, no mfd. H75 `v. Sec. #2, 5 volts at
D.C.w. 2.0 amp Sec. #3, 6.3
C108 Capacitor, electrol- volts O 2.5 amps
D.C.w. Pri. 16,000 ohms CT;
250V. push-pull windings
L100 Choke, 10 henries, at balanced for high
0.100 amp. audio frequencies,
B100 Resistor variable, 1 Sec. 600/150 ohms Max.
megohm, "10%, 1/2 watt, operation level 426
B101 Resistor, 100,000 ohms V100 Type 7F7
f10$, 1/2 watt V101 Type 'rm
B102 Same as R101 V102 Type SYBGT
R103 Resistor, 2200 ohms, X100 Socket, loctal, mica
il0%, 1/2 watt fined, bakelite
R100 Same as R103 X101 Same as X100
R105 Resistor, 330,000 ohms, X102 Socket, loctsl, mica
i10%, 1/2 watt filled bakelite
R106 Resistor, 5,700 ohms X105 Fuse holder, molded
i10?, 1/2 watt blaek bake11te, finger
I R107 Same as B101 operated.
| 1101, 1/2 watt
(C)John F. Rider

Page 12:

HODEIS 646,647,648 RADIO ENGINEERING LABS., INC. _
D0 mmxo AND Povmn SUPPLY ron 6 v. Dc. Usnn Q
_virrn cAT.6us. som-more WIRING Dmcmxn DwG.B-6514
REF. DESCRIPTION I REF. DESCRIPTION
6oo volts DC wkg. 1 mm, i 1O?
_-Q 20% single 755 to loud-
| C202 Capacitor - Same as speaker
ozoo V201 Tube, type 7c5
V 0?03 Capacitor - 50 mfd. VP-200 Vibrapack, audio eu-
CEOU Capacitor - 3 section VP-201, Vibrapack -(receiver
10-10-10-mfd. U50 supply) Same as
volts DC Wkg. VP-200
C?05 Capacitor - dual, NO- X200 Socket - loctal, micaf-
ho mfd. 1>>5o volts DC filled bakelite
Hkg. X201 Socket - Same as
C206 Caoacitor - Part of X-200
C-203+ (10 mfd. section) X202 Fuse holder,
C201 Capacitor - Part of
C208 Capacitor - Part of
fuse tynel#AG
E200 Relay, filament - single
i pole, normally open, DC
Lzoo Choke, filter, smooth -
, L20l Choke - Same _as L-1
1/2 watt
(C)Jchn F. Rider

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