RCA BTE-115 User manual

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Broadcast Equipment
BTE-115
FM
Exciter
Ml-561060
IB-8025256-1

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WARNI NG
VOLTAGES THAT ARE DANGEROUS TO LIFE ARE
INVOLVED IN THE OPERATION OF THIS ELEC-
TRONIC EQUIPMENT . OPERA TING PERSONNEL
MUST AT ALL TIMES OBSERVE ALL SAFETY
REGULATIONS. DO NOT CHANGE TUBES OR
MAKE ADJUSTMENTS INSIDE THE EQUIPMENT
WITH VOLTAGES APPLIED. DANGEROUS CONDI·
TIONS
MAY EXIST IN CIRCUITS WITH POWER
CONTROLS IN THE OFF POSITION DUE TO
CHARGES RETAINED BY CAPACITORS, ETC.
ALWAYS DISCHARGE AND GROUND CIRCUITS
PRIOR TO TOUCHING THEM TO
AVOID PERSONAL
INJURY OR LOSS OF LIFE.
EMERGENCY
FIRST AID INSTRUCTIONS
Personnel engaged in the installation, operation , or maint enance of this equi pm e nt 01 similar e qu i pment are urged to
become familiar with the following rules borh in th eory and practice. It is the duty of all operating personnel to be
prepared to give adequate Emergency Fir st Aid and thereby p1 event avo•dable loss of life.
1. Fi nd out 11 the person is
breathing.
You
must find out tf the person
has
stopped breathing. If you
think he is not breathing, place
him flat
on h is back . Put your
ear close to h is mouth and look
at his chest. If he is breathing,
you
can feel the air on your
cheek. You can see his chP.st
move up and down. If you do
not feel th e air or see the chest
move, he
is not breathing.
RESCUE
BREA TH ING
2. If he is no t, open th e airway by
tilting his head backward.
Lift up his neck w,111 one hand
and push d own on his forehead
with t he other. Th is opens th e
airway.
Somet imes do ing this
wi ll let the person b1 eathe aga i ll
by h im sel f. If 11 does not, begi11
rescue breathing.
BURNS
3.
If he is still not breathing, begin
rescue
br eathing:
K
ee p h is head tilted backwar d.
Pinch his nose shut.
Put you r mouth tightly over h is
mouth.
Bl ow i nto his mouth once every
five seconds.
Do
Not S top Rescue Brea th i ng
Until H elp Comes.
LOOSEN CLOTHING -KEEP WARM
Do this when the victim is breath -
H\g by himself or help is available.
Keep him quiet as possible
and
t, om becoming chilled. Ot herwise,
11
e~ t him for shock.
SKIN REDDENED: App ly ice co ld water to burned area
to preve
nt burn from going deeper into sk,n 1,s~u~.
Cover area wi th cl ean sheet or cloth to keep away <1 11.
Con sult a physician.
deepe1
into sk 111 tis sue . Cove, area with cl ean sheet or
cloth
to keep away air. Treat victim for shock and take
to hospita l.
SKIN BLISTERED OR FLESH CHARRED : Apply ice
cold
water to burn ed area to prevent burn f1 om 901119
EXTENSIVE BURN - SKIN BROKEN : Cover area with
cltia,1 sl1 ei:>t or t: lo th to keep away air. Treat victim for
shock ancl take
to hospita l.

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Instructions
BTE-115
FM Exciter
Ml-561060
-·
lit
•
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Commercial Communications Systems Division/Front and Cooper Streets / Camde n, New J ersey, U.S.A., 08102
PRINTED IN U.S.A.
IB-8025256-1

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I I
SAFETY PRECAUTIONS
This equipment is designed to fully safeguard all personnel from operating
hazards, Labels on the equipment and caut ion notices in the instruction book
clearly point out these potential hazards.
Any module or Printed Wiring Board may have hazardous voltages exposed,
50
cau tion must be exercised,
Follo w the recommended procedures provided in the I nstruction Book for care
and maintenance of the equipment,
Always replace the protective covers af t er servicing the equipment.
WARRANTY ITE MS
Particular parts and/or equipment covered by warranty are spec if ically stated as
such in the warranty or contract given to the customer at the time of sale. The
warranry or contract also stipu l ates the conditions under which the warranty
may be exercised,
To obtain a new replacement for such warranty items, contact your l oca l RCA
safes
office and please supp ly Product I dent ifi cation (including the Original In-
voice
Number, Ml Number, Type Number, Model Numbe r, and Serial Number)
and Replacement Pa rt Identification (including Stock Number and Description).
Reque sts for warranty rep l acements may be undu ly d elayed if all this in•
formation is not supp lied.
EQUIPMENT LOST OR DAMAGED IN TR ANS IT
When d••livP.r ing the equipment to you, the truck driver or carrier's agent will
present a receipt for your signature. Do not sign it until y ou have (a) inspected
the conta iners for visible signs of damage and (bl counted the containers an d
compared wi th the amount shown on the shipping papers . If a shortage or if
evidence
of damag e is noted, insi st that notat i on to that effect be made on the
ship ping papers before you sign them,
Further, after receiving the equipment, unpack it and inspect thoroughly fo r
concealed
damage. If concealed damage is discovere d, immediate ly notify the
carrier,
confirming the notification in writing, and secure an inspectio n report.
This item should be unpacked and inspected for damage WI THIN 15 DA YS after
receipt. R eport a ll shortages and damages to RCA, Commercial Communication
Systems Division - Camden, New Jersey 08102 .
RCA will file all clalms
for loss and damage on th is equipment so long as the
inspection report is obtained. Disposition of- the damaged ite m wi ll be furnished
by RCA.
FIELD ENGINEERING SERVICE
RCA Field Engineering Service is available at current rates. R equests for field
engineering service
ma y be addressed to your RCA Broadcast Field Represen-
tat ive or the RCA Servi ce Company, Incorporated -Broadcast Service Divis ion
- Camden, New Jersey 08102 . Te lephone [phone].
TECH ALERT
Emergency 24 hour telephone consultation service for technical prob l ems is
available. Call TECH ALERT at (6 09 ) 338-3434. Tel ex messages will be
forwarded to the addressee upon receipt. Western Union telex number is
83-4450 ,

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BTE-115 FM EXCITER SYSTEM OPTIONS
TECHNICAL SUMMARY.
GENERAL DESCRIPTION
DETAILED CIRCUIT DESCRIPTION.
Audio and Metering Module.
Modulated Oscillator .. .
RF Amplifier ...... .
High-Frequency Divider
..
Reference Oscillator and AFC
Power Supply
INSTALLATION ... ...... .
General . . . . . . . . . . .
Selection of a Mounting Position
TABLE OF CONTENTS
Drilling Holes ... . : . . ...... .
Interfacing the Exciter to the Transmitter
Control Circuits .......... .
AC Power Input to the Exciter System.
Exciter
RF Outputs.
Audio Input Signals
Final Mounting.
INTERNAL ADJUSTMENTS . . .
Power Supply ..... .
+13.5 Volt Adjustment
Maximum Power Set ..
Modulated Oscillator ..
Oscillator Frequency.
Distortion Adjust ..
Modulator Sensitivity
Buffer Tuning . ..
Amplifier Tuning ..
Buffer Calibration.
RF Amplifier ..
Input Tuning. .. .
Driver
Tuning .. .
Final
Tuning ... .
Forward Power Calibration.
Reflected Power Calibration
Reference
Oscillator and AFC .
Frequency Adjustment
......... . .... .
3125 Hz Tuning (Divider/Miscount Monitor Tuning}.
AFC Loss Idle Adjustment.
AFC/Defeat Switch
.......... .
Audio and Metering Module ........ .
Meter Zero. .
..... . ...... .
Wideband Gain Trim .......... .
Composite Modulation
Meter Calibration.
Total Modulation Meter Calibration.
SCA 1 Injection Meter Calibration .
SCA 2 Injection Meter Calibration.
Left Modulation Meter Calibration.
Right Modulation Meter Calibration.
Monaural Gain Trim .....
Monaural Mete~ Calibration.
Pre-emphasis Trim
Meter Damping ..... . .
V
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IV
TABLE OF CONTENTS (Continued)
ROUT IN E OPERATION .
Meter Readings .
Power Adjustment
Frequency
Control
Indicators
RF Samp l es ....
PARTS ORDER I NG I NFORMATION
REPLACEMENT PARTS .
SUGGESTED EQUIPMEN T SPARES
Figure Title
A BTE-115 Front Panel
B BTE-115 Rear View
C
PW Board Locator
LIST OF ILLUSTRATIONS
D Modu l ated Osei l lat or PW Board
E Audio and Meter i
ng PW Board
F Power Supply PW Board
G
Reference Oscillator/AFC PW Board
H
RF Amp l ifier PW Board
I High Frequency Div i der PW Board
l BTE-115
FM Exciter, Block Diagra m
2
Main Frame, Schematic
3 Audio and Metering Board, Con trols and Adjustments
4 Audio and Metering B oard, Schematic
5 Modulated Osci l lator, Adjustments
6 Modulated Oscillator, Schematic
7 RF Amplifier, Adjustments
8 RF Amplifier, Sc h ematic
9 High Frequency Divider, Schematic (Early Models)
9A High Frequency Divider, Schematic (Later Models)
10 Reference Oscil later/AFC , Adjust ments
11 Reference Osci l lator/AFC, Schematic
12 Power Supply, Adjustments
13 Power Supply, Schematic
14 Audio LPF (Audio and Metering Boards), Schematic
15 Input Pad (Ma in Frame), Schematic
16 Audio and Mete ring Board, PWB L ayout
17 Modulated Osci l l ater, PWB Layout
18 RF Amp li fier , PWB Layout
19 H igh Frequency Divi der, PWB Layout
20
Reference Oscillator/AFC, PWB Layout
21 Power Supply, PWB L ayout
22 Aud io LPF, PWB Layout
23 I nput Pad, PWB Layout
24 Power
Di stribut ion PWB
25 I nterface Panel Schemat ic
26 Exciter System Layout and Template
16
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18
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23
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Page
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BTE- 11 5 FM EXCITER SYSTEM OPTIONS
The BTE- 11 5 FM Exciter System is available in several forms as follows:
1. Mono
(A)
(B)
(C)
(0)
System, ES-560982, includes
1 Exciter, less audio LPF, 5 MHz crysta l and oven (Specify
1 5 MHz reference crystal and oven (Instal l ed in Exciter)
l Plu
g-in 15 kHz audio L PF for BTE-115
1 Con n ector, Audio lnout
frequency)
2.
Mono and l . SCA Sys tern, ES-560983, includes
(A) l Exciter, less audio LPF, 5 MHz crystal and oven (Specify frequency)
(B) 1 5 MHz reference crystal and oven (Installed in Exciter)
MI-56 1 060
Ml-561066
MI - 56 1 063
Ml-561067-1
MI-561060
MI-561066
V
(C) l BTX- 1 01 SCA generator less audio LPF (Specify freq. 41 or 67
(D) l Plug-in 15 kHz audio LPF for BTE- 11 5
kHz. std .) lo' 1-561062
(E) 1 Plug-in 5 kHz audio LPF for SCA unit
(F) l Interconnecting cable
3. Mono and 2 SCA System, ES -560984, includes
(A) 1 Exciter, less audio LPF , 5 MHz crystal and oven (Specify frequency)
(B) 1 5 MHz reference crystal and oven (Installed in Exciter)
(C) 2 BTX - 101 SCA generators, less audio LPF
(D) l Plug-in 15 kHz audio LPF for BTE-115
(E) 2 Plug-in 5 kHz audio LPF for SCA units
(F) 1 Interconnecting cable for BTE-115 Mono and 2 SCA systems
4. Stereo System , ES -560985, includes
!
A) l Exciter, less audio LPF, 5 MHz cr.ystal and oven (Specify frequency)
B) 1 5 MHz reference crystal and oven (Insta lled in Exciter)
C) l BTS-101 Stereo generator less 2 audio L PFs
D) 1 Plug-in 15 kHz audio LPF for BTE -1 15
(E) l Pair of plug-in 15 kHz audio L PF for BTS-101
(F) l Interconnecting cable for BTE-1 15 Stereo system
5. Stereo
and 1 SCA System, ES-560986, includes
(A) Ex citer, less audio LPF, 5 M Hz crystal and oven (Specify frequency)
(8) 1 5
MHz reference crystal and oven (Installed in Exci ter)
(C) 1 BTS - 101 Stereo gene rator less 2 audio LP Fs
(D) 1 BTX-101 SCA generator less audio LPF
(E) 1 Plug-in 15 kHz a ud io LPF for BTE-115
(F) 1 Pair of plu g-in 15 kHz audio LPFs for BTS-101
(G) l P lu g-in 5 kHz audio LPF for SCA unit
(H) 1 Interconnecting cable for BTE- 11 5 Stereo and l SCA system
6. Stereo and 2 SCA System, ES-560987, includes
(A) l Exciter, less audio LPF, 5 MHz crystal and oven (Spec if y
(B) l 5 MHz reference crystal and oven (Installed in Exciter)
(C) 1 BTS- 1 01 Stereo generator less 2 audio L PFs
(D) 2 BTX-101 SCA generator less audio LPF
(E) 1 Plug-in 15 kHz audio LPF for BTE-1 15
(F) 1
Pair of plug-in 15 kHz audio L PFs for BTS- 101
(G) 2 Plug-in 5 kHz audio LPFs for SCA units
(H) 1 Interconnecting cable for BTE-115 and 2 SCA sys tems
frequency)
MI-561063
MI-561065
MI-561067-2*
Ml-561060
MJ-561066
MI-561062
MI-561063
Ml-561065
Ml-561067 - 3*
Ml-561060
MI - 56 1 066
MJ-56106 1
Ml-561063
MI-561064
MI-56 1 06 7-4*
MI-561060
MI-56 1 066
MI-5610 61
MI-561062
MI-561063
Ml-561064
Ml-561065
Ml - 561067- 6
M1
-56106 0
MI-561066
M I-561061
MI-561062
MI-561063
MI-561064
MI-561065
Ml-561067-6
The followi ng optional items are available for use with the BTE-1 15 FM Exciter System:
l . Spare 5
MHz crystal and oven
5 MHz crystal only
crystal oven on ly
2.
Complet e set of connector pl ugs for the BTE-115 Exciter
3. Compl ete set of connector plugs for the BTX -1 01 SCA Generator
4. Complete set of connectors pl ugs for the BTS-101 St ereo Generator
5. Blank aluminum pa nel, 1-3/4"
6. Set of chassis s li des for servicing
7. Interface a nd Radiate Panel
8. Connector Kit for Interface Panel
9. Dri llin g Temp la te for mounting exciter system
*
tir
In some cases an MI-56 1067 Interco nn ect Cab le having a higher
dash number than that specified may be supplied.
Required only
when interface pa nel MI - 56107 1 and/or Interconnection
Cab le MI-561071 are not used.
MI-561066
M l-561066X
MI-561066A
MI -561068**
Ml-551070**
MI -561069**
MI - 561072
Ml-561073
MI-561071
Ml-563485
3742738

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VI
PERFORMANCE
Type of Emission.
Frequency
Range
TECHNICAL SUMMARY
(prograrrrnable in 50 kHz steps) . . ..
Power Output (adjustable from front panel).
VSWR. . . •
Output
Impedance.
Output Connector.
Frequency Deviation -
100 %modulation
Modulation Capability
Carrier Frequency Stability
Modulation.
MONAURAL OPERATION
Audio Input Impedance
Audio Input Level
(100 %modulation).
Audio Frequency Response (30-15000 Hz).
Harmonic Distortion
Intermodulation
Distortion. . . .
FM Noise Level (referred to 100% modulation).
AM Noise Level (referred to 100% modulation).
Pre
-e mphas is Network Time Constant. .
F3 and F9
87.5 to 108 MHz
4 to 17 watts
Ooen or direct short
• · 50 ohms
.Type BNC
±75 kHz
±100 kHz
±500 Hz max.
Direct carrier FM
600 ohms, balanced
+10 dBm ±2 dB , referred to 400 Hz
. . ±1.0 dB max.
.0.3 % or less
0.3% or less
- 70 dB
-60 dB
0, 25, 50 or 75 µs ec as desired
.
Type BNC
• > 5000 ohms resistive, unbalanced
WIDE BAND OPERATION
Input Connector
Input
Impedance
Input Level
3.5 VRMS nominal for 100 %modulation referred to 400 Hz
ELECTRICAL
Power Line Requirements
Combi ned line Voltage Variation and Regulation.
Power Consumption
MECHANICAL
Dimensions, inches (cm)
(overall):
Width
Height.
Depth
Weight, pounds (kg)
Altitude, feet (meters)
Ambient Temperature
.120,
208 or 240 volts,
single phase, 50/60 hertz
±10%
80 watts max.
19 (48 .3)
3-1/2 (8.9)
9 (22.9)
.
40 (18. l)
. . 7500 (2286) max.
-20°c to+ 7o
0c (-4F0
to+ 140°F)

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VI I
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FM f ll( ltr: fll ■ T E H 5
J6
Figure A. BTE-115 Front Panel
J5 QI
J8 J7
--- - ---- --
..,,_
-~ ":-1
-
,.
Fl
02
J2
J4 J3
---- -----~---- --'
Figure B. BTE-115 Rear View

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VI II
MODULATED OSCILLATOR
• •
•
•
REFERENCE OSCILLATOR/AFC
2K 0 47
RF AMPLIFIER
VI
HIGH FREQUENCY DIVIDER
Figure C. PW Board Locator
Tl
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