Cross Technologies 450R User manual

Model 450R, 450T
Dual FM Subcarrier
Receiver and Transmitter
Operators Manual
FIRST 8/10/98 REV A 8/26/99
Data, drawings, and other material contained herein are
proprietary to Cross Technologies, Inc., and may not be
reproduced or duplicated in any form without the prior
permission of Cross Technologies, Inc.
When ordering parts from Cross Technologies, Inc., be sure
to include the equipment model number, equipment serial
number, and a description of the part.
CROSS TECHNOLOGIES, INC.
6170 SHILOH ROAD
ALPHARETTA, GEORGIA 30005
[phone]
FAX [phone]
Toll Free 888-900-5588
WEB www.crosstechnologies.com
E-MAIL [email protected]
450 Operation Manual Rev A Page 1 8/26/99

Model 450R, 450T Dual FM Subcarrier Receiver and Transmitter
Operators Manual
TABLE of CONTENTS
SECTION TITLE PAGE
Warranty........................................................4
OPERATORS SAFETY CONSIDERATIONS................5
1 GENERAL INFORMATION ................................. 7
1-1. INTRODUCTION ........................................................... 7
1-2. SPECIFICATIONS .......................................................... 7
1-3. SAFETY CONSIDERATIONS ............................................ 7
1-4. GENERAL DESCRIPTION ................................................10
2 INSTALLATION ............................................ 11
2-1. INTRODUCTION ........................................................... 11
2-2. INITIAL INSPECTION .................................................... 11
2-3. PREPARATION FOR USE ................................................ 11
2-4. Power Requirements ..................................................... 12
2-5. Line Voltage Selection ................................................... 12
2-6. Power Cable ...............................................................13
2-7. OPERATING ENVIRONMENT .......................................... 13
2-8. RACK MOUNTING ........................................................ 13
2-9. AUDIO, ALARM CONNECTIONS... ................................... 13
2-10. VIDEO BASEBAND CONNECTIONS ................................. 14
2-11. VIDEO FILTERING ....................................................... 14
2-12. REPACKAGING ........................................................... 15
3 OPERATION ................................................ 16
3-1. INTRODUCTION .......................................................... 16
3-2. APPLYING POWER ....................................................... 17
3-3. CONTROL SWITCHES ................................................... 17
3-4. STATUS CHANGES ...................................................... 17
3-5. ALARM INDICATIONS .................................................. 18
3-6. TROUBLESHOOTING .................................................... 19
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TABLE of CONTENTS
SECTION TITLE PAGE
4 ADJUSTMENTS and OPTIONS ........................... 22
4-1. INTRODUCTION ........................................................... 22
4-2. RECOMMENDED TEST EQUIPMENT ................................. 22
4-3. TRANSMITTER FRONT PANEL ADJUSTMENTS .................. 23
4-4. Level Adjustment (IF) ................................................... 23
4-5. Deviation Adjustment (DEV) ........................................... 24
4-6. RECEIVER FRONT PANEL ADJUSTMENTS ........................ 26
4-7. Squelch Adjustment ..................................................... 26
4-8. Audio Adjustment ........................................................ 27
4-9. TRANSMITTER INTERNAL OPTIONS ................................ 27
4-10. Audio Input Level ....................................................... 29
4-11. Audio Input Impedance ................................................. 29
4-12. Emphasis Type (with Compressor OUT) ............................ 29
4-13. RECEIVER INTERNAL OPTIONS ...................................... 30
4-14. Audio Output Level & Impedance .................................... 30
4-15. Emphasis Type (with Expander OUT) ............................... 32
4-16. Input High Pass Filter .................................................. 32
450 Operation Manual Rev A Page 3 8/26/99

WARRANTY
This Cross Technologies product is warranted against defects in material and workmanship for one
year from the date of shipment. During this period Cross Technologies will either repair or
replace, at its option, products which prove to be defective.
To obtain service under this warranty, this product must be returned to Cross Technologies at its
address. Buyer shall pay all shipping charges to Cross Technologies, and Cross Technologies
shall pay all charges for return shipment to buyer. When this product is to be returned from
outside the United States, buyer shall pay all shipping charges, taxes, duties or other reasonable or
necessary costs to transport the product safely in both directions.
LIMITATIONS AND EXCLUSIONS
This warranty shall not apply to defects resulting directly or indirectly from any of the following:
Improper or inadequate maintenance.
User-supplied interfacing or connected equipment.
Operation beyond the specifications of the unit or under severe
environmental conditions.
Improper facility preparation or maintenance.
No other warranty is expressed or implied. Cross Technologies specifically
disclaims any implied warranties of merchantability or fitness for any particular
purpose. Under no circumstances shall Cross Technologies be liable for any
incidental, indirect or consequential damages or losses, whether or not Cross
Technologies has any advance notice of the possibility of such damages.
Correspondence: CROSS TECHNOLOGIES, INC.
6170 Shiloh Road, Alpharetta, GA 30005
Telephone [phone] FAX [phone]
Toll Free [phone] E-mail [email protected]
450 Operation Manual Rev A Page 4 8/26/99

OPERATORS SAFETY CONSIDERATIONS
General
The general safety information in this documentation is for operating and servicing personnel.
Specific warnings and cautions will be found throughout the manual where they apply and may or
may not appear here.
Safety Symbols ___________
_ WARNING _
___________
WARNING symbols indicate a condition, practice or procedure that, if not properly performed or
adhered to, could result in personal injury or loss of life.
CAUTION
CAUTION symbols indicate a condition, practice or procedure that, if not properly performed or
adhered to, could result in damage to the equipment or other property.
Before Applying Power
CAUTION
Verify that the voltage selection on the power receptacle matches the line voltage and the proper
fuse is installed. See Section 2. ___________
_ WARNING _
___________
This equipment is grounded through the grounding
conductor of the power cord supplied with the unit. To
avoid electrical shock, plug the power cord into a properly
wired receptacle. An uninterruptible safety earth ground
must be provided from the main power source to the
equipment via the power cord. Grounding one conductor of
a two conductor wiring system or cord is not sufficient
protection.
450 Operation Manual Rev A Page 5 8/26/99

OPERATORS SAFETY CONSIDERATIONS
(Cont'd.)
___________
_ WARNING _
___________
Danger From Loss of Protective Ground
Upon loss of the protective ground connection, all accessible
conductive parts can render an electrical shock.
Do Not Remove Covers or Panels
To avoid personal injury or shock, equipment should not be
operated without covers or panels.
Servicing
Servicing instructions are for the use of qualified servicing
personnel only. Some adjustments described in this manual
are performed with power applied to the equipment and the
cover removed. To avoid dangerous shock, only qualified
service personnel should perform maintenance.
LCD Display Module
The LCD Display Module mounted in the front panel is
fragile. Care should be taken not to break the exposed glass
panel. If broken, extreme caution should be used to avoid
cuts from sharp edges. If the liquid crystal material touches
your skin or clothes, wash it off immediately using soap and
plenty of water. Do not allow any of the liquid crystal
material to get in your mouth.
450 Operation Manual Rev A Page 6 8/26/99

Section 1 - GENERAL INFORMATION
1-1. INTRODUCTION.
This manual contains information necessary for the installation, operation, testing and alignment of
the Model 450 FM Subcarrier. The documentation for this product is divided into five sections as
described below.
Section 1. General_Information: provides general information about this equipment, circuit
description and specifications.
Section 2. Installation:providesinstallationinformationincludinginitialinspection,installationand
repackaging the equipment.
Section 3. Operation: provides information about front panel checks and settings.
Section 4. Performance_Tests: provides information to verify the performance of the equipment.
Section 5. Adjustment&Options: provides information to adjust the equipment, and to select the
various options.
1-2. SPECIFICATIONS.
The specifications are listed in Table 1-1. These are performance standards to which the Model
450 is aligned and tested.
1-3. SAFETY CONSIDERATIONS.
Safety information, relating to installation, testing, etc. is found throughout this manual. Please
refer toOPERATORS SAFETY CONSIDERATIONS at the beginning of this manual.
DEV I F DEV I F 5.41MHz
6.17MHz A B
PROGRAM
EXECUTE ALARM
450 SUBCARRIER
TRANSMITTER
CROSS TECHNOLOGIES INC.
SQUELCH AUDIO 6.20MHz
6.80MHz A B
PROGRAM
EXECUTE ALARM
CROSS TECHNOLOGIES INC.
SQUELCH AUDIO
450 SUBCARRIER
RECEIVER
Figure 1.1 450 Subcarrier Transmitter and Receiver
450 Operation Manual Rev A Page 7 8/26/99

TABLE 1-1 SPECIFICATIONS
Audio Interface:
Input/Output
Frequency range ..................... 40 Hz to 15 kHz
Peak program level ................. +9 or+18 dBm selectable
Impedance ............................ 600Ωor high Z in 600Ωor low Z out Balanced,
transformer coupled
Connector type ...................... Terminal block
Audio Characteristics: (with 3:1 compandor and emphasis)
Dynamic range ....................... >90 dB
Frequency response ................ ±0.25 dB
Total harmonic distortion
(1 kHz @ PPL) ...................... <0.1%
Intermodulation distortion .......... <1%
Interchannel phase difference
1000 Hz ........................ <6°
50 Hz and 15 kHz ............ <10°
Compandor type .................... 3:1 improved
Modulator Characteristics:
Output frequency range ............ Frequency agile from 1.0 to 9.99 MHz in 10kHz steps.
Frequency stability ................. ±300 Hz over operating temperature range.
Connector type ...................... BNC Female
Peak carrier deviation(PPL) ....... ±75 kHz (adj.)
Subcarrier level ...................... 25 to 100 mV P/P (adj.)
Output impedance ................... bridging (>4 k ohms)
Demodulator Characteristics:
Input frequency range .............. Frequency agile from 1.0 to 9.99 MHz in 10 kHz steps.
Operating channel spacing ......... 280 kHz, minimum
Connector type ...................... BNC Female
Impedance ........................... bridging (>4 k ohms)
Input level ............................ 25 to 100 mV
Recommended operating conditions for satellite applications ...... C/n≥61 db•Hz
450 Operation Manual Rev A Page 8 8/26/99

TABLE 1-1 SPECIFICATIONS
(Cont'd.)
Power Requirements:
Standard...............................115/230 VAC (47-63 Hz)
Environmental Requirements:
Ambient temperature for:
Storage .......................... -20°C to +70°C
Specification .................... +10°C to +40°C
Humidity. ............................ 95% maximum
Altitude:
Storage .......................... 12,200 meters(40,260 ft.) ASL
Specifications .................... 3,050 meters(10,000 ft.) ASL
Alarms:
Front panel visual and Form C contact.
Receiver ............................. Operates upon degradation of either carrier or frequency.
Transmitter .......................... Operates upon degradation of either carrier frequency or
loss of synthesizer lock.
Dimensions:
2 channel transmitter ................ 44.4 mm (1.75") H X 483 mm (19")W
X 381 mm (15")D
2 channel receiver ................... same as above
450 Operation Manual Rev A Page 9 8/26/99

1-4.GENERAL DESCRIPTION.
The Model 450 Dual FM Subcarrier System consists of two complete frequency agile FM
transmitters or receivers in a single enclosure. A common microprocessor circuit is used to
program the operating frequencies of the channels, monitor alarm conditions, and configure some
system options. The microprocessor circuit incorporates a non-volatile memory device that retains
the most recent settings indefinitely during power outages or prolonged storage.
The 450 was designed to provide the wide dynamic range, low distortion transmission path
required for today's digitally mastered and recorded program material, while maintaining the
traditional bandwidth and poor-path performance advantages of analog FM techniques. Essential
to accomplishing this is a newly designed precision audio noise reduction system. This system
consists of a dynamic range compressor in the transmitter, and a complementary dynamic range
expander in the receiver. The compressor/expander ("compandor") system incorporates fast attack
RMS detection, multipole pre- and de-emphasis, overshoot limiting, and audio bandwidth filtering.
For applications requiring compatibility with existing uncompanded subcarrier equipment, the
compressor and expander can be switched out of the signal path by the microprocessor. Internal
jumper options then select either 75 uS or CCITT J.17 emphasis networks (75uS factory setting).
The video baseband is combined with the subcarrier signals in the transmitter by a low component
count passive directional coupler. This circuit has been designed to put virtually no load on the
video line (>4 K ohm), allowing multiple units to be "daisy-chained" without adversely affecting
the signals on the baseband. The low component count and passive nature of this circuit provide
excellent protection against disruption of the baseband due to component failure or loss of power in
the 450.
While the 450 Subcarrier system is most often used in conjunction with video signals, the wide
operating frequency range and narrow bandwidth also make the unit attractive for multi-channel
applications on a video baseband without video. To accommodate these applications, the 450
Receiver incorporates an internal jumper option to bypass the input highpass filter that normally
protects the discriminator circuits from the high level video signal. With the highpass filter
strapped out, the entire baseband is available to the receiver.
450 Operation Manual Rev A Page 10 8/26/99