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| Document ID | 59204 |
| Application ID | ux3oXc3rbEtA3fSi8+lJVA== |
| Document Description | 8 |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 151.5kB (1893800 bits) |
| Date Submitted | 1999-09-15 00:00:00 |
| Date Available | 1999-09-30 00:00:00 |
| Creation Date | 2001-05-31 15:16:54 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-05-31 15:17:38 |
| Document Title | 59204.pdf |
| Document Author: | VicodinES /CB /TNN |
Instruction Manual
For
ATM-1600
NTSC Broadcast
Television Modulator
P/N 0020-5020
Rev.A, February 1992
Data, drawings and other material conmjned herein am propriclary lo Cale] Telecommunicau‘ons, Inc. and may not be
reproduced or duplicated in any form Wilhoul [he pnor penmssxon of Cats] Telecommunicalions. Inc.
Shoe its formation in 1 968, Catel Telecommunications has manufac~
tured high performance video and audio products to support the needs of
the broadcast and cable television industries, as well as other operators
of broadband communications systems. For over 20 years, Catel has
demonstrated the innovation and financial stability to serve a growing
base of satisfied customers.
Catel offers fully integrated optical and electronic systems and is commit-
ted to solving customer problems through economical application of
optical and radio lrequency technologies. it continues to pioneer ad-
vances in these and other related technologies via substantial research
and development Because of a commitment to protect customer invest-
ment. Catel manufactures compatible products, offers flexible system
architectures, and provides the means of graceful migration to new
generations of technology.
Long known for reliable products, Catel has evolved into a majorsupplier
of systems forthe industries it serves. Further, Catel's commitment to
quality extends from design into manufacturing and through ongoing
systems suppo rt.
fa
WARRANTY
Catel warrants new equipment purchased hereunder to be free from
defects in workmanship and material toraperiod of one (1)yearofthedate
or purchase. Catel agrees to make good, F.O.B. Catel‘s factory, all
defective parts of such new equipment which are returned to Catel‘s
factory, transportation prepaid.
All equipment returned for repairunderwarranty requires prior authoriza-
tion, with a return authorization number assigned by the factory or an
authorized factory representative. As in the case of new goods, return
shipments will be made F.0tB. factory and are insured unless otherwise
specified. Claims for visible or concealed damages are to be filed by the
purchaser with the carrier within five (5) days after receipt of the goods.
This warranty will not apply to equipment which has been subject to
misuse, neglect, accident. incorrect wiring not Catel's own, improper
installation, unauthorized modification or use in violation of our instruc-
tions, norwill it extendto units wherethe serial numberhas been removed
or delaced.
Equipment furnished by Catel but manufactured by another company
shall bear no warranties other than the special hours-of-use or other
warranties extended by and enforceable against the manufacturer at the
time of delivery to the purchasertor the period stated in that warranty.
THIS WARRANTY IS EXPRESSED IN LIEU OF ALL OTHER WARRAN-
TIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITEDTO, THE
IMPLIED WARRANTY OF MERCHANTABILITY AND THE IMPLIED
WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE. CATEL
SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT
LIMITED TO, INDIRECT, CONSEQUENTIAL OR SPECIAL DAMAGES
ARISING OUT OF OR IN CONNECTION WITH THE SALE , USE OR
PERFORMANCE OFTHE PRODUCT. NO REPRESENTATION BYANY
EMPLOYEE OF CATEL MADE ORALLY OR BY CONDUCT SHALL
CONSTITUTE A WARRANTY.
ATM-1600
TABLE OF CONTENTS
Subject
List of Illustrations
List of Tables
List of Equipment.
Equipment Specifications
1.0 General
1.1 Introduction
1.2 General Descriptio
1.3 Features
1.4 Options
1.5 Applications
2.0 Installation
2.1 Introduction .5
2.2 Receiving and Inspection , .5
2.3 Chassis installation .5
2.4 Power Requirements . .5
2.5 Front Pane .6
26 Rear Panel .6
2.7 Switch and Jumper Option 8
2.8 Module Removal/Installation 1
2.9 Cabling the Equipment ...... 12
3.0 Operation 7
3.1 Introduction . 7
3.2 Setup 7
3.3 Video Modulation Adjustment. 7
3.4 Audio Deviation Adjustment. Monauml. 8
3.5 Audio Deviation Adjustment, Composite BTSC Stereo 8
3.6 Subsidiary Communications Authorization (SCA) Input .19
3.7 Audio Carrier Level Adjustment. Monaural/BTSC , I9
3.8 4.5 Mhz Subcan‘ier Input Monaural/BTSC .19
3.9 External 45.75 lvfl-Iz Inpu , 19
3.10 Visual IF Frequency Calibration .20
3.1] Visual Output Level Caltbration 10
3.12 Calibration for White Level Clipper, Video Frequency Response and Differential Phase ..... ...20
II
ATM- 1600
TABLE OF CONTENTS
(Continued)
Subject
4.0 Circuit Ducription
4.1 Introduction
4.2 Chassis 3
4.3 Audio Modulator 3
4.4 Video Modulator 8
4.5 Baseband Encoder Interface .. 5
4.6 Audio Subcarrier Processo
5.0 Parts Listm. ,
5,1 Introduction jg
5.2 Ordering Informauon "33
III
A TM- 1 600
“H
LIST OF ILLUSTRATIONS
Illustration Page No
Figure 1-1 ATM-1600 Block Diagram ..
Figure 1-2 ATM-1600 Internal Top View .3
Figure 2-1 ATM-1600 Power and Fuse Assembly ,5
Figure 2-2 ATM-1600 From Panel .6
Figure 2-3 ATM-1600 Rear Panel ..... ,7
Figure 2-4 Audio Switch and Jumper Locations .9
Figure 2-5 Video Switch and Jumper Locations 10
Figure 2—6 PC Board Removal (Internal View) ll
Figure 2—7 Noma] lnput/Outpur Connections .. 3
Figure 2-8 Input/Output Connections wrrh Optional 4.5 MHz Audio Subcarrier Input. 4
Figure 29 Encoded Visual/Aural II-‘Connun'ons.... 5
Figure 2-10 Baseband Scrambler Connecuons 6
Figure 3-1 Adjustment Access through Top Panel 1
Figure 3-2 Video Modulation Waveform Tests 2
Figure 44 Schematic Diagram, Power Supply . 4
Figure 4~2 Schematic Diagram, Back Plane ...... 5
Figure 4-3 Schematic Diagram, Audio Modulator 26
Figure 44 Schematic Diagram, Video Modulator 9
Figure 45 Baseband Encoder Interface Assembly. Block Diagram 35
Figure 4-6 Baseband Encoder Interface Assembly. Timing Diagram 6
Figure 5-1 ATM-1600 Final Assembly. Internal View
Figure 5-2 PCB Parts Location Diagram. Audio Modulator
Figure 5-3 PCB Pans Incation Diayam, Video Modulator
Iv
ATM-1500
LIST OF TABLES
Table Page No
Table 2-1 Audio Switch and Jumper Options
Table 2-2 Video Switch and Jumper Options
Table 3-1 dB/Modulau'on Raxio Table..
A TM- 1 600
“M
LIST OF EQUIPMENT
Broadcast Television Modulator
PCB Extraction Tool
Cable Power Cord. 3—Cond. Detachable
ATM-1600 Accessory Kit (F)
CABLE, COAX 6.00” F CON'N (2 ea.
TERMINATOR MALE BNC
PACKING SLIP
SCR. PHIL W/NYLON WSHR 1032 X 5/8" (4 ea).
PLASTIC BAG, 9" X 12" X 4 NHL RECLOSABLE.
TERMINATION 75 OHM. F DC-SSO MHZ .....
ATM-1600 BROADCAST TV MOD. MANUAL
ATM-1600 Accessory Kit (ENC)
CABLE’ COAX 6, ENC CONN(2 ca.)
TERNHNA'IUR MALE BNC
PACKING SLH’...“
SCR. PHIL W/NYLON WSI’R 10-32 X 5/8 (4 ea
PLASTIC BAG, 9" X 12" X 4 ME. RECLOSABL
TERMINATION, 75 OHM, F 130550 MHZ
590l~2031-XX
5218-0028
0020-5020
120-2050
.. 521 1-0026
69100015
157- 1010
7600-0029
21870028
ATM-1600 BROADCAST TV MOD. MANUAL 4 ..... 0020-5020
Optional Equipment
Baseband Encoder Interface ..... 90013037
Audio Subcaxrier Processor . not available at {his priming)
vl
ATM-1600
EQUIPMENT SPECIFICATIONS
Video
input
Input Level
Input impedance
Retum Loss
Frequency Response
White Level Clipper
Modulation Range
Differential Gain
Differential Phase
Video Signal-In-Noise
AM Hum and Noise
Sync Compression
Till
K-Factor, 2T Pulse
Group Delay
Video Sense
Audio
input Type
Input Level
Capability
Frequency Response
THD
FM Hum and Noise
lntcmarrier Frequency Accuracy
BTSC/MTS Stereo Channel Separation
SCA
Maximum input Level
Nominal lnpul Level (67 kHz Subcan-ier)
Composite NTSC video, negative sync.
1.0 V p-p for 87.5% modulation. 1; 6 dB adjustment range
High impedance loop—through (for 75 ohm Circuit)
30 dB minimum. 25 Hz to 6.0 MHZ
with 750, I‘ll; external terminator (supplied)
$0.5 dB,25 HztoMS MHz
Adjustable 85 - 95% (internal adjustment)
To 9596 modulation depth
295 maximum at 87.596 modulation depth. 10»90% APL
05" maximum at 87.596 modulation depth, 10-90% APL
>63 dB weighted. measured with Tektronix 1450-1
60 dB Minimum below 87.5% modulation depth
0.25 dB maximum at 87.5% modulation depth
1% maximum on 60 Hz squarewave
2%
Meets FCC Regulations Sec. 73.687 (a) (3) requirements
for broadcast exciters
Tl'LOutpuL' H] = 5 V. with Video in; [DW = 0 V, with no Video in
Monaural: High-impedance bridging. (6000 (external) balanced or
unbalanced)
BTSC/MTS: 750 unbalanced input
Monaural: 0 dBm.t 10 dB
BTSC/MTS: 1.0 v p—p, 1 10 dB
Monaural or BTSC/MTS with switchable preemphasis network, or
separate inpuu. MTS bandwtdth to 120 kHz
Monaural: within 2 0.5 dB of 75 us preemphasis, 30 Hz to 15 kHz
BTSC/MTS: Defined by stereo encoding unit
Monaural: 0.593 maximum at £25 kHz deviation. 30 Hz to 15 kHz
BTSC/MTS: Defined by stereo encoding unit
60dB minimum belowfis kHz deviation, 30 Hz to 15 kHz. monaural
4.5 MHz 1 100 Hz. any combination of specified modulation and
operaong temperature
40 63 minimum, 50 Hz to 10 kHz
410 Volts palms—peak
2.2 Volts peak-lo-peak
h“—
VII
ATM-1600
EQUIPMENT SPECIFICATIONS (CONT.)
IF Output
Output Type
Output Impedance
Output Return Loss
Output Level
Frequency Accuracy
ICPM
Aural AM Noise
H: VSB Output Attenuation
[F Output Attenuation
External Signal Sources
IF Reference Signal
Level
Impedance
Options
Baseband Encoding
4.5 MHz Aural Input
Electrical
AC Power Input
Maximum Input Power
Fuse
VIII
Separate Visual and Aural IF outputs, and a combined IZF output
75 Q
>16 dB
¢ 40 dBmV, minimum with normal setup, All inpudoutput ports
I 200 Hz of 45475 Nfl-Iz visual or 41.25 MHz aural IF,
any combination of specified modulation and operating temperature
<3e at 57.5% modulation depth
< -55 dB at4ll25 MHz
Visual Came: +0.7 to 4.18 MHz: i 05 dB relative to + 200 kHz
Visual Carrier 4.25 MHz -38 dBc
-2.25 MHz and below -60 dBc
+4.75 MHz -38 dBc
+525 MHz and above -60 dBc
45.75 MHz CW can-let
4; 30 to +50 dBmV
75 fl
Optional interface for Zenith Z-TAC Encoder
Optional inpul for 4.5 Mhz aural carrier. monaural or BTSC/MTS
from off-air demodulator or stereo generator
90260 VAC, 47-63 Hz
19 Walls
SAG, 1/2 amp slow blow for 115 VAC
SAG. 1/4 amp slow blow for 230 VAC
ATM-1600
"M—
EQUIPMENT SPECIFICATIONS (CONT.)
Environmental
Operating Tcmperalure
Operating Humidity
Mechanical
Size
Weight
Chassis
lnternal Controls
Front Panel Controls
Front Panel Indicators
30“ W 450° C
95% maximum, non—condensing,
175" H x 19" W x17" D
12 lbs
Steel
BTSC/Mono audio selection
SCA Input (ON/OFF)
lmemal/Extemal 45.75 Mhz reference
Power ON/OFF Switch
Video Modulation Control
Aural Carrier Control (level)
Audio Deviarion
Audio Deviation Meter
Video Modulation Meler
-20 dB IF Test Point
Ix
EQUIPMENT SPECIFICATIONS (CONT.)
Rear Panel Connectors
AC Fuse Block
Audio HI—Z (Input Terminal Block)
BTSC In (ENC)
SCA/ Aural Subcarrier In (ENC)
Video In (ENC)
Video Out (ENC)
Gare In (Z—TAC encoding) (F or BNC)
Aural Out (F or BNC)
Aural In (F or BNC)
Visual Oul (F or BNC)
Visual In (F or BNC)
Comp H7 Out (F or BNC)
H7 Ref (F or BNC)
RF Out (F or BNC)
Video Sense (Terminal BIock)
ATM-1500
ATMo1500
GENERAL
1.0 GENERAL
1.1 introduction
The purpose of this manual is to introduce Catel’s
ATM-16a) BruadcastTelevision Modulator (ATM-16m),
explain its options and features. and give some examples
of its uses. In addition. detailed sections have been de-
voted to the installation and operation of the ATM-1600.
The manual concludes with a thorough description of its
circuitry and a parts list to order spare or replacement
parts.
1.2 General Description
The ATMrloOO is a high performance modulator
designed for use in broadcast television and broadband
applications. Refer to Block Diagram, Figure 1-1. The
modulator converts audio/video signals to IF carriers to
drive a transmitter upconverter. The configuration de-
scribed in this manual is for the NTSC format. However.
PAL BIG, PAL I, or SECAM D/K versions oft-he ATM-
1600 are available.
The ATM-1600 is composed ofa chassis/power supply
and two different modules: one for audio and another for
video (refer to Figure 1-2). The design is based on the use
of plug-in circuit boards which can be removed and/or
replacedatwill,e.g.,anoptioml 4.5MHzAudioSubcan'ier
Processor module could replace the Audio Modulator as
required
The ATM-1600 Broadcast Television Modulator chassis
is designed for installation in standard (EIA) 19 inch
racks. and occupiesone (1) vertical mounting space (1 .75
inches high). User adjustments, monitor points and bar
graph modulation means are located on the chassis front
panel 0er to Figure 2-2). The input and output connec-
tors are located at the rear along with an AC power input
block and fuse holder (refer to Figure 2-3).
The ATM-1600 accepts baseband video and audio signals
(monaural or BTSC) which modulate 45,75 and 41.25
MHz can-iers respectively. Loopout connectors for the
aunt] and visual IFcam'ers are provrded on the rear panel.
Following the loop, the visual H: signal passes through a
surface acoustic wave (SAW) filter to sharply define the
passband edges. Next the aural and visual IF carriers are
combined. when required, and sent to the composite IF
output connector on the rear of the panel.
1.3 Features
1. Broadcast VSB-AM modulation
2. BTSC/MT S compatible
3. Surface acoustic wave (SAW) IF filtering
4. Selectable intemal/exlemal 45.75 MHz reference
5. Bar graph modulation meters
1.4 Options
4.5 MB: Audio Subcarrier Processor—Replaces the Au-
dio Modulator when a 4.5 MHz audio subcarrier input is
required (mammal or BTSC) versus a baseband audio
input.
Zenith Z—TAC—Provides an interface to the video mod-
ule for scrambling signals.
1.5 Applications
In its standard configuration the ATM-1600 accepts
onebond audio and Video from sources such as asatellite
receiver, off~air demodulator, VCR or a live audio/Video
input. Theaudio may bemonaural.30 to lSkHz. orBTSC/
MTS. 30Hz to 120 kHz. Anoptional 4.5 MHz Subcarrier
Processor replaces the standard Audio Modulator when
the audio source is at 4.5 MHz such as from a BTSC
generator or off-air demodulator.
For broadcast use the aural and visual IF loops on the
chassis rear panel provide access points to excite a trans-
mitter upconvener and RF output amplifier. The same IF
R—
ATM-1600
GENERAL
Efluso v.85 80225
3 got
"Pxilwmmmmvawn. lll.yl|.y“
ATM-1600 GENERAL
loops allow the user to inrerface a variery of IF encoders The NTSC version nI'Lhe ATM-1600 may be changed to
to me ATM—1600 for scrambling purposes. An inremal one of (he OLhBl' currently available versions (PAL BIG,
interface for the Zenilh Z-TAC scrambling system is PAL [or SECAM D/K) by ordering rhe appropriate audro/
available as an cplion. video modules.
' ‘1
=’]
Flguri 1-2
ATM-1600
Internal Top vlaw
GENERAL A TM-1600
ATM-1600
2.0 INSTALLATION
2.1 Introduction
Proper installation ofthe ATM71600will ensurepeak
performance. dependability and ease of operation. Instal-
lation includes the following steps:
Receiving and Inspection
Chassis Installation
Power Requirements
Cabling the Equipment
2.2 Receiving and Inspection
Inspect the shipping container for visible damage. if
the container or packing materials are damaged, they
should be saved in case a claim needs to be filed with the
can-let. Any obvious damage to the container. packing
materials, or equipment should be noled on the receiving
papers at time of delivery. Notify the carrier as soon as
reasonably possible in those cases where delivery is taken
prior to finding suspected damage to the shipment.
If physical damage to the system is suspected. do not
perform any operational test. This is to prevent operator
exposure to potential hazards. and further damage to the
equipment.
Cate] tests every shipped product to ensure that all are
operating cmectly prior to shipment, and makes every
effort to ensure that equipment will arrive in a safe and
timely manner. However, if the equipment is not opera-
tional upon receipt, and there is no evidence of shipping
damage. it may be necessary to remm the equipment for
repair or replacement. If so. contact the Care] Repair
Deparunentandrequest a return authorization (RA) num-
ber.
All returned equipment should beadequately packed with
the RA number on the outside ofthe box. A packing slip
should be included. stating the equipment defect, reuun
shipping address and RA number.
2.3 Chassis Installation
The ATM-1600 chassis is intended to be mounted in
standard (BIA) 19~inch racks. Installation will be made
INS TALLA TION
from the front of the rack. A rack mount kit (P/N 80007
1601) is provided with each chassis. The chassis cabinet
is equipped with handles used for mountingpurposes. The
handles are capable of supporting a fully loaded chassis
provided all four rack mount bolts are used.
2.4 Power Requirements
The ATM-1600 requires a power source of 90 - 260
VAC 47- 63 Hz single phase, Switching in the ATM- 1600
is not required over this voltage range. Current consump-
tion is less than .150 AC amperes. The unit is fused with
a If). amp slow blow for 115 VAC, or 1/4 amp slow blow
for 230 VAC. See Figure 2-1 for fuse replacement; the
Fuse Pull handle ejects the fuse after the power cord is
removed and the fuse cover is slid to the left.
Warning
Before switching on the ATM-1600. its protec-
tive ground terminal must be connected to the
AC power source ground. The main power cord
should be inserted in an outlet with a protective
grotmd contact. Do not negate the grounding
pmtection by using an extension cable, power
cord or auto transfonner without a protective
ground conductor. Failure to ground the ATM-
1600 properly could result in serious personal
injury.
Figure 2-1
ATM-1600
Powerl. Fuse Assembly
INS TALLA TION A TM-1500
“M
2.5 Front Panel 2.6 Rear Panel
The ATM-1600 front panel, its indicators, the pos- The ATM»1600 rcarpanel. its connectors, their uses,
sible adjustm ems, and the connectors availableare shown . and loops required to implement special optionsare shown
in detail in Figure 2-2 in detail in Figure 2~3.
o POWER—Applies line voltage to the ATM-1600
power supply.
9 AUDIO DEVXATION—This control sets the au-
ral carrier deviation with a baseband monaural or
composure BTSC input.
a AURAL CARRIER—This adjustment controls
the aural can-ier level at tlte COMPOSITE [F OUT
rear panel connector (113),
AUDIO DEVIATION—Deviation of the audio
carrier is indicated on the front panel bar graph.
VIDEO MODULA'I'ION-‘erThis bar graph
provides a visual indication of video modulation
percentage.
VIDEO MODULATIONkAdjusI visual carrier
modulation depth, with a baseband video input.
IF TEST POINT -20 dB—The “P‘ type connec-
tor allows monitoring of the composile [F output
using a spectrum analyzer or other instruments.
The signal at this test point is 20 dB down from the
output.
0000
T?
xm'v- mu.-
0 INPUT 90-260 VAC,47-63 Hz—Input connector
for line power. This power module also contains
the line fuse.
6 AUDIO HI-Z. JZ—Acceptsbnseband audio (mon-
aural) for direct FM modulation of the 41.25 MHz
VCO in the Audio Modulator. Input level is 0 dBm,
t 10mm: terminated externally with a 600 ohm
impedance matching resistor, when bridging is not
required.
a BTSC IN, Iii—Accepts acomposile BTSC input
for direct FM modulation ofthe 4125 MHz VCO
in the Audio Modulator. Input level is LO V pp i
0.5V.
0 SCA/AURAL SUBCARRIER IN, JFAccepts
an aural subcarrier at 4.5 MHz for direct
upconverston to the 41.25 MHz aural IF carrier.
May be used for monaural or stereo sound. Re-
quires an optional 4.5 MHz Audio Subcan-ier
Processor to replace the Audio Modulator for op
eration, If the optional 4.5 Nil-[z Audio Subcarrier
Procesor is not used this connector is used as an
SCAinput. SCAinputlevelwillbeZ.5Vp-p. 10.5V,
9 o
Figure 2-2
ATM-1600 From Panel
ATM-1600
6 VIDEO lN/OUT, JS, J6—Provides high imped-
ance loop-through connections for the baseband
video signal source. Connect the vrdeo source to”
and terminate J6 with a supplied 75 ohm termina-
ror,P/N521l-OOZGI'ornon-looptluough operation.
e [F REF, J7—Prowdes either input or output of
45.75 MHz CW IF carrierreference. Impedance in
either operating mode is 75 ohms, nominal.
OUTPUT MODE (normal. stand-alone operating
mode): Video Modulator swrrch (SWl) placed in
INT. position. 17 provides 45.75 MHz CW output
at +40 dBmV level. May be used as a 45.75 Nfl-iz
source for coherent system operation or may be
applied to a frequency counter for measurement of
the visual IFirequency. 17 must be terminated with
a supplied 75 ohm terminator (P/N 5218-0028, F;
P/N 5211—0026, ENC ) when not usw as a signal
source.
INPUT MODE: Video Modulator switch (SW1)
placed in EXT. position, 17 accepts a 45.75 MHz
CW inputata +40 dBmV level from an HRC comb
generator or from another reference unit.
0 GATE IN, Js—Accepts timing pulses from a
baseband encoding scrambler such as the Zenith Z—
TAC system. Provides necessary timing
information to the video modulator for proper
clamp operation with scrambled Video.
INS TALLA TION
o AURAL IN/Oll'l‘,19,JlO—Nonnally used as an
aural IF source to drive a transmitter- upconvener,
also provides an interconnection between the
modulator‘s4l 25 MHz aural IF circuits and an IF
encoder for pay TV scrambling. Jumper 19 to “0
With supplied cable assembly (PIN 5120-1060. F;
P/N 5120-2050, ENC) for IF signal continuity in
non-scrambled operation when a composite output
is needed at 113 COMP OUT. The aural IF input
and output interface level is + 40 dBmV.
VIDEO SENSE, 116 —'1'his monitors the pres—
enee of video on 15, VIDEO IN. An LED lamp or
other alarm circuits may be connected between the
Video Sense terminal and ground for remote indi-
cation of video status. The video sense output is
I'll. with high equaling 5 V with video in, and low
equaling 0 V with no video in.
VISUAL IF OUT/TN, J] 1, JIZ—Provides inter-
connections between the modulator's 45.75 MHz
visual IF circuits and an IF encoder for pay TV
scrambling. Jumperlll £0112 with supplied cable
asemhly (P/N5120-1060,F;P/N51202050. ENC)
for IF signal continuity in non-scrambled opera-
tion. The visual IF input and output interface level
is 440 dBmV.
COMP IF OUT, JILvaides a Video plus
audio composite IF output from the Video Modu»
Iator. orvis ual IFonIy if therearpartel aural IF loop
through is broken. Normally used as an IF source
to drive a transmitter upconvener.
im a
ogmoeooooo
urul u an .. m an mm
m arm wart
“HQ
Figure 2-3
ATM-1500 Hear Panel
INSTA LLA TION
ATM-1600
9 RF REF, Ila—Not used
Q RF OUT, JI7—Not used
2.7 Switch and Jumper Options
The ATM-1600 is designed with swtlch andjumper
connections on the PC board assemblies which allow the
user to select from various options on the assemblies
These options provide flexibility in applying the modules
to specific and unique applicationsi Switch and jumper
options on the video and audio modules should be set
according to the infomaxion shown in their respective
table’s; Table 2 -l for audio: Table 24 {or video. Switch
and jumper locations are shown on Figure 2-4 (Audio),
Figure 25 (Video).
A TM-1600 INSTALLATION
swncmuuPER
COMMENTS '
SWi Ind Swim
mono pnsmnn
Mow- iov - Dal-hand Mil} mpuL 30m 5an and
nnabiu audio pnrmphm nowk.
The mum main input min tannin-i mp we on ma mu
ennu- paw. mam luv-I lhouid be OdBm tiOdB.
SW! and SW: m
8750 posmen
Fm campww BTSc inpun 30 n 120011 and
6153111" audio pvt-mumm- nolwovk
Tho mmposfln sTsc mpm u in: ENC cannula! n on me we:
chum panoi Inpui rum mama boi a V 979 xosv
Js ON Auows in: a Seualaw SCA mm“, mm audio envy SCA input mauki in un ENC emu-cw Jn on the rear chassis
pami.
No 50A lnpuL Jumps: mould be in ms OFF polmofl wm m7 SCA mpm
Table 2-1
Audio Switch and Jumper Options
GATE!-
An 590141344, Hw.
Figure 24
Audio Switch and Jumper Locations
INSTALLATION ATM-1600
swncrwuupsn coqums
use
Solocu m- hinmal IF REF quumy, Parade; 4535 MHz cw mm m «a dEmV m n
sw1 Emmai Soiocu m oxwrui IF REF mecy cw 45.75 um llgnll input in on mun-m J7. input levol
lmld M Mar“: 1045
JBJZ. JQ Us” in plug in opuonll Z~TAC mildam boud.
ms flpnoflll mm diam use cl nu me Z-TAC scrambling
mm
JlOPihlZwi
Comb-nu m- wwai and amal IF umm ma ma iF
SAW filler.
Cumulus: M mun! Ind aural lF mm"! Mk)" I!" An when and in sylrems when in. IF wrim ale encodud
iF SAW mm
Table 2-2
Video Switch and Jumper Options
Normal,
FL1
m inn-15mm, an
film
SWI
Figure 2~5
Video Switch and Jumper Locations
M—
10
ATM-1600
2.8 Module Removal/Installation
The ATM- 1600 modulesare configured and installed
at the (aetory‘ however they may be removed to change
intemal switch settings or to be replaced, e.g.. an optional
45 MHz Audio Subcarrier Processor could replace the
Audio Modulator if required.
The ATM-1600 ON/OFF power switch must be in the
OFF positron prior to module removal or installation.
To remove the modules. loosen the two thumb screws and
INSTAL LA TION
remove the ATM-1600 front panel. Using the ATM-1600
PCB Extraction Tool (P/N6099-(Xl27) remove the Audio
and Video Modulator modules as one assembly as shown
in Figure 2-6. Remove the two bolts holding the modules
together; the two modules may now be separated,
To install the modules, insert a module (either the Audio
Modulator or4.S MHz Audio Subcarrier Processor) into
the edge connectorofthe VidcoModulator module, install
the two bolts. Reinsert both modules as one assembly into
the ATM-1600 chassis. Replace the chassis front panel
l and secure with the two thumb screws.
Step 1
lnsert Extraction Tool lrom the
top of the video board into the
holes prov'ded.
Step 2
Flemove both video and audio
boards at the same time by
pulling away from the chassis.
thure 2~6
PC Board Removal
(Internal Vlow)
11
INSTALLA TION ATM-1600
2.9 Cabling the Equipment
Input and output connections will vary depending on
the user applications. For the most common video, audio.
anlemodulaLorconnecLions referimhc following figures.
Figure 27, ATM-1600 rear panel connections with
baseband video and audio inpuls (monaural) and SCA
inpul (selectable) or composite BTSC audio input (selecb
able).
Figure 2-8, ATM-i600 rear panel connections with
baseband video and 4.5 MHz audio subcamer input (op-
tional) BTSC or monaural.
Figure 2~9. ATM-1600 rear panel connections, encoded
visual/aural IF.
Figure 2-10, ATM-1600 rear panel connections baseband
scrambler.
12
ATM-1600 INSTALLATION
Jl1 RF ovum um)
no a; REF nu and)
m com- IF our
vusuu |s om
h-
Junw Cam. “Sammy
pm swmcw, F
PIN swam. mc
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m mun. I4
m vmm. our
fit"
unit: [9455
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wmwmr
PIN swoon am).
PIN szvuxm :
swan
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vmzo scuncs
BCA/AIIRAL iuacmmsn In
sou swans (SELECYARE)
atsc saunas figment“)
Aumo saunas lsELECTAELE)
LN! VOLTAGE m
ATM-1 600
Flgure 2-7
Normal Input/Output Connections
13
INSTALLA TION A TM-1GDO
417 “00an
Ml HF REFO’M BOW)
Jfl confirm
vlsuM wow
412 vluAL N
h - 4“ “sun our
Jume-bh mmbly
PIN 512mm}, F
PIN immense, BM;
swam
GM!
G‘Geo $955
a AURAL our
mm wow
Pmsznwa, ENC.
PtN 52mm! s
Supp-a
46 wow ou'r
VlDEO m
VIDEO$OURCE
SCA/AURAL suscAnfilER N
m5 W1 SOURCE (cmouALJ
LINE VOLTAGE IN
ATM-1600
Flgure 2-8
Input/Output Oonnedlons with Optional 4.5 MHz Audio Subcarrler Input
14
ATM-1600
J" n: amt-u mm
Au M. wsuAL
yr our
an RF REF (not no)
m WSUAL IN
an wsun. our
Jlu MIRAL ll
PM 52|1m25.BNC,
PM ya wees F
sums-1
IF SCRAMBLER
SCA/AIJRAL suncmnlsn N
AUDIO souncs SELECTABLE
LNE vane: IN
ATM-1600
Flgura 2-9
Encoded VIsual/Aural IF Connections
INS TALLA TION
15
INSTAL LA TION A TM-1600
J" u; out (Mm-m
AURAL VISUAL
Jll ”man-um
m contour
m vsuALN
Junw cum-
PIN svzmnsq F
PM swan-2050. snc
Suppm
J": Avian ll
J AUML our
smc GATE
PIN gamma, am:
PM 521mm F
saw-u
men out
BASEBAND
SCRAMBLER
AuDlO 5CIJHCE (SELEC'ABLB
6-1-
fi-
uhf Von/m: In
ATM-1 600
Figure 2-10
Baseband Scrambler Connections
15
A rM-1sua
3.0 OPERATION
3.1 Introduction
Procedures in this section describe how to adjust the
ATM- 1600 for optimum performance. The equipmenthas
been thoroughly tested at the factory and only minor
adjustments should be required.
3.2 Setup
Connect coax cables and audio leads to the rear
chassis panel in accordance with the instructions in Sec-
tion 2 of this manual and as user applications dictate.
The following test equipment will be required for proper
adjustments of the ATM-1600.
RF Spectrum analyzer. 50 MHz Capability
Video test genaator or video source
Audio oscillator or audio source
BTSC generator with composite or 4.5 MHz output
Frequency Counter
TV Demoduiator
Waveform Monitor
Vectorscope
Step Attenuator
Plug the AC power cord into the power line module and
the AC power source. Place the POWER ON/OFF switch,
located on the front panel. in the ON position.
3.3 Video Modulation Adjustment
Connect a video test generator to 15 (VIDEO IN) of
the ATM-1600 and set it at a level that is standard for the
system. Select a fulHield test signal with full video
amplitude. A color bars or un—modulated stair-step signal
is preferred. Ensure the video loop through at 16 (VIDEO
OUT) is tenninatrd
OPE HA TION
i Connect a specnum analyzer to the front panel lF TEST
POINT. The modulated visual IF carrier signal should be
approximately +10 dBmV at this “P type connector.
Use the following spectrum analyzer settings:
Frequency 45.75 MHz for NTSC
Bandwidth Maximum or > 300 kHz
Scan Width Zero
Trigger AC Line
Video Filter None
Scan time 2 msec/division or adjusted to display
at least one picture field.
Fine tune the spectrum analyzer for maximum display
peak amplitude of the visual IF signal. Adjust the ampli—
tude and log (XE/division controls for nearly a full scale
display.
The modulation percentage is read directly in decibels as
t the difference between the peak (sync tip) and the mini-
mum(pealtwhite)of the videowavei'ot'miUsethel'ollowing
table to convert the dB ratio to percentages.
“—
—-_
—“
Table 3—1
dB/Modulatlon RatloTabIe
If required. adjust the VIDEO MODULATION control on
the ATM- l600 fronrpanel to produce a peak-white video
modulation percentage of 87.51; on the spectrum ana-
lyzerTheATM-looofmntpanelVIDI-IO MODULATION
indicator should read 87.5'1: also.
17
OPERA TION
A TM-1600
3.4 Audio Deviation Adjustment,
Monaural
The AUDIO DEVIATION control on the ATM- 1600
front panel is factory adjusted to produce 25 kHz peak
deviation with a 400 Hz, 0 dBm audio input. Wim this test 1
tone input to terminal strip 12 (AUDIO), tenninated with
a 600 ohm load. the front panel AUDIO MODULATION
meter will indicate 6 dB. The AUDIO DEVIATION
control can compensate for different audio input levels
and should be adjusted to obtain amaximum indication of
-6 1:13 on the front panel meter.
The following procedure has been provided for verifica—
tion and troubleshooting purposes.
On the ATM-16m rear panel conneCt an audio oscillator
£012 (AUDIO). terminated with a 600 ohm load. Set the
oscillator output frequency. using a counter, to 10396 Hz.
and the output level for 44.2 dBm into 600 ohms.
Connect a spectrum analyzer to 19 (AURAL OUT) on the
chassis rear panel. The modulated aural IF carrier should
be approximately +40 dBmV at this connector. Use the
following spectrum analyzer settings.
into 600 ohms. The aural IF carrier deviation will be 25
kHz peak and the front panel AUDIO MODULATION
meter should indicate —6 dB.
3.5 Audio Deviation Adjustment,
Composite BTSC Stereo
Ensure the Audio Modulator switch options are con-
figured for BTSC input. Refer to Table 2-1 Di this manual.
The AUDIO DEVIATION control on the ATM-1600 is
factory adjusted to produce 50 kHz peak deviation with a
. composite BTSC input of 1.0 V p-p with the BTSC input
toB (BTSC IN) on therearpanel.’1‘he frontpanel AUDIO
MODULATION meter will indicate 0 dB maximum. The
AUDIO DEVIATION control can compensate for differ-
ent BTSC input levels and should be adjusted to get a
maximum indication of 0 dB on the front panel meter.
The following procedure has been provided for verificav
lion and troubleshooting purposes.
Connect an audio oscillator to J 3 (BTSC IN) of the ATM-
1600 rear panel. Set the oscillator output frequency. using
a counter. to 10396 Hz.and the output level forO dBm into
75 ohms.
Connect a spectrum analyzer tol9 (AURAL OUT) on the
chassis rear panel. The modulated aural [Fcan-ier should
be approximately +40 dBmV at this connector. Use the
following spectrum analyzer settings.
Center Frequency. 41.25 MHz
Bandwidth: 3 kHz
Stan width: 20 kHz/division
Trigger: AC line
Scan time: 2 msec
Video filter: None
The aural carrier should have multiple sidebands 10396
Hzaway. When the deviation is a125 kHz, the aural carrier
power will be zero. The sidebands will contain all the
signal energy. This indicates the first Bessel modulation
null ofthecarriu. Ifrequired,adjustthe AUDIO DEVIA-
I'ION control on the ATM-1600 front panel for the firm
Bessel null.
A400 Hz test tone may now be inserted to 12 (AUDIO) of
the ATM-1600.1‘hetest tone outputlevel should beOdBm
Center Frequency: 41.25 MHz
Bandwidth: 3kHz
Scan width: 20 kHszivision
Trigger: AC line
Scan time: 2 msec
Video filler, None
The aural carrier should have multiple sidebands 10396
Hzaway. When the deviation isatZS kHz, thealu'al carrier
power will bezero. The sideband will contain all the signal
energy. This indicates the firstBesscl modulation null of
the can-let.
13
A TM-1600
If required, adjust the AUDIO DEVIA'TION control on
the ATM-1600 front panel for the first Bessel null. The
front panel meter will indicate -6 dB.
A composite BTSC signal may be insened into 13 (BTSC
IN) ofthe ATM-1600, The BTSC level should be 10 V p-
p into 75 ohms. The aural IFcarrier will deviate a much
as t 50 kHz. The front panel AUDIO MODULATION
meter should indicate a maximum of 0 all
3.6 Subsidiary Communications
Authorization (SCA) input
Ensure the Audio Modulator switch options are con-
figured t'or monauraI/SCA input. Refer to Figure 2-4 and
Table 2— 1.
Connect the SCA subcarrier source to 14 (SCA/AURAL
SUBCARRIER IN) of the ATM-1600 rear panel.
Connecta spectrum analyzer tow (AURAL OUT) on the
chassis rear panel. The SCA modulated aural [F carrier
should be approximately 4» 40 dBmV at this connector.
Adjustthe analyzer to clearly resolveand display the SCA
subcam'er.
Modulation of the aural IF carrier by the SCA subcan-ier
must not exceed FCC Regulations. (Sec. 73.682 (c)).
Non'ttally, the SCA subcarrieris setfor approximately -18
dB relative to the 41.25 NEH: aural IF carrier level. If
required. adjust the SCA subcarrier source to achieve a
-18 dB levelrelauve |othe41 .25MH.zaural IFcarrier. The
audio deviation meter do“ not accurately (understates)
display the SCA deviau'on: therefore. it should notbe used
to set the SCA levels.
3.7 Audio Carrier Level
Adjustment, Monaural/BTSC
The 41.25 MHz atu'al IF carrier level is adjustable
only it“ the mm! IF loop through is connected on the
chamis rear panel. The IF output is on ”3 (COMP IF
OUT) where both the aural and visual IF are present.
OPERA TION
Connect a spectrum analyzer toll3 (COL/D> IF OUT) on
the ATM- 1600 chassis rear panel. Adjust the analyzer to
resolve and display both the aural and visual IF can-lets.
The visual fl7(45.75 MHz, NTSC) carrierlevel should be
+40 dBmV: the aural [F (41.25 MHz, NTSC) carrier level
will be dependent on the front panel AURAL CARRIER
control.
The maximum aural canier power is 20% of peak Visual
can'ier power, and the minimum is 101: (see FCC Regu-
lations Sec. 73.1570 (c) (2)). Normally theaural IFcarrier
is set for -8 dB relative to the visual IF carrier level. in
order to comply with Sec.73. If required, adjust the AU-
RAL CARRIER control toachieve an aural carrier level of
-8 dB relative to the visual IFcarrier level.
3.8 4.5 MHz Subcarrier Input,
Monaural/BTSC
If the 4.5 MB: Audio Subcarrier Processor module
has notbeeninstalled. refertothure2»6module removal]
installation procedures
Connect a 4.5 MHz subcarrier source to SCA/AURAL
SUBCARRIER m (14) on the ATM-1600 rear panel.
Subcarrier input level should be +35 dBmV, t 5 dB into
75 ohms.
The AUDIO DEVIATION meter and the AUDIO DE-
VIATION control will not be operating. The audio
deviation is set by the 4.5 MHz subcarrier source.
The aural IFcarrier level at113 (COMP IFOUT) may be
set by the ATM-1600 front panel control AURAL CAR-
RIER.
3.9 External 45.75 MHz Input
Ensure the Video Modulator switch options are con-
figured for an external 45.75 MHz input. Refer to Figure
2-5 and Table 2-2.
On the ATM~1600rearpanelJ7 (FREE?) acceptsa4st75
CW input at a «10 dBmV level from an I-IRC comb
1.9
OPERA TION
A TM-15017
generator or from another reference standard The result-
ing aural and visual IF signals may be monitored on the
front panel H’TESTPOINT, provided the IF loop cum are
connected on the chassis rear panel.
3.10 Visual IF Frequency Calibration
Ensure the video modulator switch SW1 is config»
ured for INT, refer to Figure 2-5 and Table 2-2.
On the ATM—1600 rear panel. remove the 75 ohm termi-
natorfrom connector”, IF REF, and connect a frequency
counter.
The ATM- 1600 visual output frequency should be at
45.75 MHzi 200 Hz, Ifnot, adjust Lilwhich is accessible
through an opening in the ATM-1600Top Panel, labeled
IFOUTPUTFREQ. Seel-‘igure 3-1.Useaplast.ie inductor
(hex head) alipment tool for this adjustment. Remove the
frequency counter and replace the 75 ohm terminator.
3.11 Visual Output Level Calibration
Connect a spectrum analyzer tol13 COMP H-‘Olff.
The measured output level of the 45.75 MI-Iz visual i]:
cam’er should be + 40 dBmV. lfnot. adjust R 176 which is
accessible through an opening in the ATM-1600 Top
Panel, labeled FOUTPUT LEVEL. See Figure Svl. Use
a small (flat bladed) screwdriver for this adjustment
3.12 Calibration for White Level
Clipper, Wdeo Frequency
Response and Differential
Phase
Connect the test equipment as in Figure 3-2. Set the
waveform generator for a COMPOSITE output. Set the
demodulator to SYNCHRONOUS, SYNC TIP detection
and SOUND TRAPS OUT. Set the step attenuator toO dB
attenuation.
3.12.1 White Level Clipper
Adjust R42 WHITE LEVEL CLIP, which is acces-
sible through an opening in the ATM—1600 Top Panel. for
its maximum counter-clockwise position. See Figure 341.
Use a small (flat bladed) screwdriver for this adjustment.
Temporarily set the video modulation depth to 100% by
adjusting the VIDEO MODULATION control on the
All/171600 front panel. to a point where the video peaks
are at 120 RE as seen on the waveform monitor. Readjust
W'ifl'l'E LEVH. CLH’ (R42), to a pointjust below ampli-
tude compression. Reset the front panel VIDEO
MODULATION control back to 87.5%.
3.12.2 Wdeo Frequency Response
Set the waveform generator for a MULTIBU'RST
WAVEFORM. Adjust R6 VIDEO PEAK, which is acces»
sible through an opening in the ATM- 1600 Top Panel, for
best multihurstflamess from the lowest frequency burst at
0.5 MHz to the highest frequency burst atAJS MHz. See
Figure 3-1. Use a small (flat bladed) screwdriver for this
adjustment.
3.12.3 Differential Phase
Set the demodulator to SYNCHRONOUS. SYNC
TIP detection with ZERO CARRIER REF. ON and sound
TRAPS OUT. Set the step attenuator to 1.0 dB attenua-
tion. The tight-hand step chroma peak should be at 105
IRE units, with the Lerocarrier reference at 120 IRE units.
Calibrate the vectorscope vector lengtlt to the graticule
circle. Set the demodulator to ENV. detector mode. and
the thorscope to DlFF. PHASE.
Adjust DlFF PHASE control C60 which is accessible
through an opening in the ATM-1600 top panel, to mini-
mim the djlferential phase reading. See Figure 3-1. Use a
small (flat bladed) screwdriver for this adjustment
Switch the demodulator between ENV, and SYNCHRO~
NOUS. SYNC TIP detection modes and adjust the DIFF.
PHASE control to minimize measured differential phase
in both detection modes. The resulting differential phase
is both detection modes should be less than 03".
“E—
20
A TM- 1600 OPE HA "HON
clone
an on
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Figure 3-1
Adjustment Access through Top Panel
_________________________________________.._________________________.
21
OPERA "ON A TM-1600
J5 STEP VIDEO WAVEFORM I
VIDEO IN ATI'ENUATOR GENERATOR
VIDEO OUTJ6
UNIT £75“
IN TEST
AURAL IN J1O _§7sn
J11
VISUAL OUT fi— _QJV'DE° I” J
a . . SI VIDEO
& DEMODULATOR
20DB
PAD
750
Figure 3-2
Video Modulmlon Wavelonn Tests
VIDEO WAVEFOHM I
MONITOR
VIDEO OUT I
VIDEO IN I
VECTOR
SCOPE
VIDEO OUT I
RI
22
A TM-1600
4.0 CIRCUIT DESCRIPTION
4.1 Introduction
lnt’onnau'on is this section describes each module
Individually. If a module contains PC board switch or
jumper options, the locations are illustrated in Section 2.
Schematic drawings have been provided in this Section to
facilitate understanding of the equipment
4.2 Chassis
The ATM-16a) chassis consists of the following: basic
steel enclosure. removable front panel and removable
sub—chassis with + 18 VDC universal switching AC power
supply and back plane board. The chassis will accept one
audio/video assembly with provision for an RF converter
assembly.
Useradjustrnentstotheaudioandvideomodulesaremade
through openings in the chassis front panel, which also
provides for the modulator ON-OFF switch, Modulation
Indicators and the H1 test point; refer to paragraph 2.5.
Two thumb screws allow removal of the front panel for ‘
audio/video assembly, access or replacements; refer to ‘
paragraph 2.8.
Non-user calibration adjustments for various video and IF
parameters are accessible through openings in the Chassis
Top Panel; refer to paragraph 3.12
The internal +I8 VDC power supply accepts any input
from 90 to 260 VAC. 47 to 63 Hz. No switching or
adjustments to the sub-chassis or power supply are neoes~
sary. The power supply should be properly fused for safe
operation; refer to paragraph 2.4.
Refer to the schematic diagram of Figure 4-1 for power
supply circuit design information. The input AC line
voltage is applied to the input rectifier DB] and filter C7.
The resulting DC voltage passes to the switching trans-
former T2 and the switching power MOSFET Q]. The
switching frequency is 30 kHz with a maximum duty
CIRCUIT DESCRIPTION
cycle of 85%. The T2 output voltage is rectified and
filtered by D7 and its associated LC network. The result-
ing +18 VDC output at TB2 is set by V'Rl. Overvoltage
protection is provided by D21 and SCRI.
A small portion of the DC voltage is fed back to the output
voltage sense circuit lCl and lC2 which vary the duty
cycle of the current mode controller lC3. The controller
supplies gate drive to the MOSFET swilch. This voltage
control loop maintains a constant voltage at the DC output
terminal, TBZ.
Overload protection is provided by the MOSFET source
resistor R3 and the current mode controller IC3. The
voltage at pin 3 of 1C} is monitored and compared to a
level derived from the output voltage sense circuit lCl and
ICZ. Abnormal operating conditions occur when the power
supply output is overloaded or if output voltage sensing is
lost Under these conditions the current mode controller.
lC3 will shut off the gate drive to MOSFET switch Ql.
Input/output connections as well as internal module con-
nections and DC routing are made through a common
back plane board and sub—chassis wiring: refer to Figure
4-2.
4.3 Audio Modulator
Refer to the schemch diagam Figure 4-3 for circuit
design and to Figure 2-4 for switch and jumper options
locations. The Audio Modulator is a directl-‘M transmitter
designed to supply an aural l]: signal at a frequency of
41.25 MHz for NTSC.
Input to the unit is switchable from baseband audio.
through a balanced, bridging input, to a composite BTSC
signal, through an unbalanced 750 input via SWl and
SW2. The input networks are bridged by an audio ampli-
fier UlAthatfeeds an audio buffer amplifierUlB through
potentiometer R1, used as a level control (AUDIO DE»
VlA’l’lON, front panel). The audio buffer amp drives an
AC/DC converter circuit and the modulator VCO, and
provides the preemphasis characteristic. The 75 usec pre~
emphasis is removable via SWl.
23
131
L)—
n>~
z)—
TBZ
«ll vm:
Figure 4-1
Schemalu: Dlagram, Power Supply
24
TERM
I.
SCA/SUBCARRIER L5 MHz lN J4 >———
CDMP IF
KPLANE
IASSIS
>~>e
LINE VDLTAGE IN
TIZI Jl, BACKPLANE
(amass VAC) >>1
47—63 Hz
Flgure 4-2
Schemlllc DI-sr-m, Back Plan.
25
SP‘ECIAL NOTES
|EESISYINCE IS IN Dflfis
z CAP-O'nct us in mmxmacs. ‘5"
: |NDUC7ANCE IS IN VWNRVS
mum.
+5v
41,25 SAMPLE ‘
2-
EYSC m
Aumm»
Aumu ouY
C B
Flgure 4-3
Schemaflc Diagram, Audio Modulator
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