RCA CR-91 User manual

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CENERCAL PURPOSE
COMMUNICATIONS RECEIVER
MODEL CR-91
INSTRUCTIONS
RCA VICTOR DIVISION
OF
RADIO <'ORPORATIOH OF AMERICA
Camden. N. J .. U. S. A.

GENERAL PURPOSE COMMUNICATIONS RECEIVER
MODEL CR-91
TECHNICAL SUMMARY
Electricel Characterist ics
Frequency Range-tou! 6 bands .. .... .. ..... . .... .. ..... ... ... . .... . . . .. . . . . • . . . .
Band 1 .... . . . ........... . .... · .... . · ·· ...• · ·· ···• · ·.·•· · · · · ·· · ·• · · · ·· · ·· ··
Band 2 ... . .. . . . . . .... .. .. ~ .. . . . . .... . • .. . ... . .. . .. .. .. .. .. .• . .... •. . .. . . ...
Ba nd 3 . . ... .. .. " .. , ...• , .. .. . •. ....• ' ..• • . . • . . . .. . . •.. • . • . • ... • . ' . ' . .... .
Band 4. . .. . .................. . ...... . . . .......... . ... • . • .. . . • . . • . . . . . .... .
Ba nd S ... .. .... .. ... . ...... . ..... .. .... .. .. . .. , ·· ... . ·· .. . • .. .. . .. .... . ...
Band 6 .. ... ... .... .. .. .... . . .. .. . . .. .. .... ... ... .. . • . . . . . . ... • .. . .. .. .... .
Maximum Undist o ned Ou tp ut - ap proxim ate-2.5 watts
Out put Impedance-2 .5 ohm s and 600 ohm s.
Power Supply Requiremenb
7l to :;0,500 kc
73 to 205 KC
195 to 55 0 kc
1,480 to 4,4 00 kc
4,250 to 12,150 kc
11 ,900 to 19,500 kc
19,0 00 to :iO ,500 kc
Line Ratin g .. . .. . .. .. . . .. .. . . .. .. . .. . 100·r17, 117·135 ,135·1 65 ,190·23 0,2 00·260 vo lts, 50/ 60 cycles
.or &t te rie,s . . .... ... .... . .... . ..... . ... . .. ... . .. 6 volt "A " ba tt ery and 250 [0 l OO volt "B" b att ery.
or
Vibrat or Po w er Supply Un it . ... .... .. .. . . .. .. . . MI ·8319.
Power Co ns um pti on- l00 watt s.
Tube Complement
R·P a nd I-F A mp lifi er s. . .. .. . .. . .. •.. .... ........ ........ . . •. ..... . . .... .. ..
1st Dete ctor (c on ve rte r) ...... . .• . • . . .. •.. • . . . .. . • .. . •• . • . ... • . . . . ... .... .. .
Oscillator . . . ... " .. . . , . . .. . , •. , . . • . .. ,. , .. . . . .. . . .• . . . .• . . , . • . • •. .. ...• . . ,
2n d Dete cto r· . .. . .. .. . . .. . .. . •. . .. .. •..•. . . . •. .• .•.. .. ..... • ....• . . .. . . • .· ..
N·
L' .
Olse: Im ltu . . . . . . . ..... . ...•• . . ••• • . • • • • • • • · .. • • •. • . . · •• • . ···· • . •. .• · • ··.
A·p Am p li fier ..... ... , . . .. .. • . . •. • ... . • . . . . • , . . , •. • . • •. • . . •. • . . • • ..• .. • . ..
Power Amplifier . .. . .. . .. .. . . .. . .. .. .•.. . . • .... . . . .• ... . • .. ..• .. . . . , ... .. . .
Beat Freq uency Osc illator . . ... .. •.. . . • . .. • . . , ... ..• ... . •.... . .. ... .. . . •. ....
R ec tiner .......... . ..... . .. . •. , • . . , ' •.. . . • . . . , .. •.. .•• ...... , ... •.. . ••. , . . .
Voltage Regulator .... .. .. . . .. . • . • . . .. .. .. . .. , . .. .... .. .... .. .... . . . ... .. . . .
MeCMnicel Spe.cific:ations
5 RCA·6SG7
1 RCA -6SA7
1 RCA.6J5
1 RCA ·6 H6
1 RC A· 6H6
1 RC A ·6S ]7
1 RCA 6V6GTIG
1 RCA·6J5
1 RCA ·5 Y3GT/ G
1 RCA-VR·15 0
Ov erall Dime nsi ons .... . .. . .. . ..... .. .... .. .... . 19l,4 inc hes wide x 11 inches high x 191
/
.. inc hes d ee p
TABLE I- PERFORMANCE DATA
(Appr oximate Values--Taken on Sample Recei ver)
Sens itivity Anten na Input in
Ant enna Inpu t in
Band in M ic rovolts Mic rov olts for :20 DB
Microvolts f or 20 DB
Image
N o. M e: gacycJes for 0.5 waU Signal·Noi
r.e Ratio Signal·Noire
Ra tio Ra tio
1 .077 .5
1.8 10.0
.1 40 .5
1. 8 10.0 Great
e: r th an
.190
.5 1.8 10.0 1,000,000
2 .205
.6 1.0 7.0
,375
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1. 0 8.0 G reater
th an
.5 00
••
1.5
10.0 1,000,000
3 • I. • .5
1.5
11.0 1,000,0 00
3.0 .7 1.3 1 0. 0
4.0
.5
1.3 1
0. 0 25, 000
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4.5
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2.0 12.0 500,000
1
1. 0
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1.5
10.0 9,000
5 12.4 1.0 2.0 n.o 15,000
19.0
.5 2.0 12.0 3,5
00
6 20.0 2.0
2.0 11.0 3,5
00
30.0
1. 0 2.0
13 ,0 600
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I-F reje ctIOn at 1600 kc IS 800. 000 . 4
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VI
INST ALLA TION
Power Supply . T he power supply ci rcuit is in-
tegral with tht : receiver. Determine line voltage and
fr"yuency and check with the rattng of the receiver.
The po\ver transforrncr pri l nary T1lity he connected
for anyone of five vo lt;lge ran ges by mea ns of Cl L1. p
switch. This switch is l o, · ~t e d in the rear apron of the
r ecei\'e r~ and the voltage for \vhich it is set may he
read directly un the .switch.
For Battery or other Supply Operation - For con-
ne ct ions sec S l' h c. malic Diagram figure 11. It is only
neccss,lry to re move the plug fro m th( ~ socket on the
rc ;.tr of the n.:: -:.,;' iv cr . ,mu conne ct the b atteries to the
prop er tl~rrninid. s as indicilted hy thl~ schema tic dia ~
gr '\ n1. A. hatt c ry c ahle terminating in an o::tal mal e
pl
ug IS Il ccc5s ary for thi 5 purpose . A vlbr ;l tu r po\v cr
sup ply MI - S:; I9 i. available wh ic h wi ll operate the
re ceiver uircctly from a 6 vD lt storage hattery. For
inforl11,lti Ol1 011 this 110\v cr unit SI;'~C Se ct ion XI.
Tubes Insp ect the chas.,.;s before apply i ng power
tu see that all tuhes arc firmly seated in their respec·
tive sockets.
Antenna .. T he input Impedance at the ant enna
terminals is desi.gned to match a 200 ohm transml s"
sion. line or a st rai g llt wire ca paLity t~ :pc antenna.
For gl,; ~ neral use it is re c nmmcnut :d th at a s traight
\""1[ (' an tenna hetween 25 an d 50 fec t long he used
for hands:' to 6 inLlu .s ive~ and a WI fe of 200 fCt~ t or
more for han d :; 1 and 2.
Speaker - Terminal s for conne ct ion of a loud-
speaker are indicated in Figur es '2 and 6. Th e ou tput
transf o rmer is designed to mat ch a speaker having
7.5 ohms ilnpedanc e.
Headphone ., A jack is proviueu on the l eft of
the front panel for plugging in a pair of headphones.
T here are l\VLl posit ions of the plug.
1. Half way in -,-- fo r rc:ct':ptio ll on hnth speah::r
and phones. .
2. F\llIy in ior phone rece pti on onl y.
See "CIRCUIT ARRANGEMENT" "Output
Tub e."
MO\lnting _.-
The i nstrument may be placeu on a
tahle or mo u nt ed on a r al." . k. For rack mo uncing loos en
the p;tncl mounting scr(~\ \'s anJ re move the panel and
ch assis cn mpletc fr om the cabinet. Th e: panel is
cqu ip pe J. with slilll c.larcl sl()ts for rack mounting.
VII
OPERATION
Pigurc 3 illustrates t he dials an J control kn ohs.
TUNING
TONE
TRIINS .
OFF "
ANT.
.... BFO
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POWER TRANS. ~ RANGE
RECEIVE PHONES
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VERNIER
TUNING LOCK
4
R.F.GAIN AoUDIO GAoIN SELECTIVITY
Figure 3 Diagram of Fron' Pallel
8
NOISE LIMITER
BFO
MAN.N.L.
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MAN .,
I A.V.C. N.L..
A.V. c.
NOISE LIMITER
AND AV.C.
R-879E

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525
OUT
TRANSMITTER
RELAY
OIVERSIT'f ~~,
Figure 6-C R-91 Cl!a u is
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ANTENNA PH-5!5697