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Model 455R, 455T
Composite MTS/BTSC
Subcarrier Receiver and 
Transmitter

Operators Manual

 Rev 2.2 6/25/98

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

(770) 886-8005

FAX (770) 886-7964

WEB www.crosstechnologies.com

E-MAIL [email protected]

Содержание 455R

Страница 1: ...ot 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 equipmen...

Страница 2: ...ESCRIPTION 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 ENVIRO...

Страница 3: ...UCTION 26 4 2 RECOMMENDED TEST EQUIPMENT 26 4 3 TRANSMITTER FRONT PANEL ADJUSTMENTS 27 4 4 Level Adjustment IF 27 4 5 Deviation Adjustment DEV 28 4 6 Use of the Overmodulation Indicator 30 4 7 RECEIVE...

Страница 4: ...ITATIONS 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 eq...

Страница 5: ...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 l...

Страница 6: ...y 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...

Страница 7: ...eration provides information about front panel checks and settings Section 4 Adjustment Options provides information to adjust the equipment and to select the various options 1 2 SPECIFICATIONS The sp...

Страница 8: ...m 280 kHz for narrow deviation 600 kHz for wide deviation Remote control input User selectable for on off or alternate frequency selection Power requirement 115 230 VAC 47 63 Hz 20 VA Storage temperat...

Страница 9: ...us 5 position modular terminal strip for remote and alarms Demodulator Characteristics Composite output level 1 0 V rms for 150 kHz deviation wide or 73 kHz deviation narrow Subcarrier input level 1 m...

Страница 10: ...ange the settings of the unit by accident A built in non volatile memory device retains the most recent configuration of the unit during temporary power outages or even prolonged storage without power...

Страница 11: ...the equipment has been checked mechanically and electrically This equipment was carefully inspected both mechanically and electrically before shipment It should be free of mars and scratches and in pe...

Страница 12: ...n pc board Before connecting this device to the power source verify that a protective earth ground connection is provided through the grounding conductor of the power cord The protective ground connec...

Страница 13: ...el 455 is intended for rack mounting in a rack having an EIA standard width of 482 6 mm 19 inches It is shipped from the factory with the mounting brackets set for flush mounting Optionally the mounti...

Страница 14: ...also selects LOCAL The connecting circuit should be capable of sinking at least 200 A to assure a logical low condition to select remote Most commercial logic devices including TTL CMOS are compatible...

Страница 15: ...d description of the connections are Transmitter BTSC Composite InThis 75 input is designed to accept the output of a BTSC composite generator which has built in SAP and PRO channel generators or whic...

Страница 16: ...uld be adequately filtered to prevent harmonics or other high frequency components from interfering with the low level subcarrier signals in the upper part of the baseband If the video signal source d...

Страница 17: ...container should be used Minimum requirement would be of singlewall construction 200 pound test material 2 The equipment should be wrapped in plastic with 3 to 4 inches of shock absorbing material on...

Страница 18: ...es must start with the operation of the Program Execute switch and must also end with the operation of the Program Execute switch If this sequence is not followed none of the changes will take effect...

Страница 19: ...ent is vertical and has two functions A During frequency changes the vertical movement will raise or lower the frequency in the direction of the arrows B For other functions such as on off or compando...

Страница 20: ...ON OFF is selected the status can be modified by operating the vertical switch This will alternately turn the channel on or off B If changes are desired in the frequency move the cursor to the digit t...

Страница 21: ...nk in the case of a transmitter overmodulation alarm Indicate the alarm status on the LCD display The following will occur for all alarm conditions except transmitter overmodulation alarm Cause a form...

Страница 22: ...ting problem 3 6 TROUBLESHOOTING In the event of difficulty with the 455 Subcarrier System the following list of possible causes should be reviewed prior to contacting the factory for repair In the ev...

Страница 23: ...hirps buzz etc close The 455 requires 600 may also be present kHz wide or 280kHz narrow between adjacent center frequencies to meet all specifications At closer spacings some of these symptoms may app...

Страница 24: ...e memory device The unit may still be used press the Program Execute switch to proceed but should be returned for repair as soon as convenient since a power interruption may cause loss of the unit s p...

Страница 25: ...ing or inconsistent with display circuit board to the normal operation main circuit board may have come loose due to rough han dling in shipping See Sec tion 5 13 to remove cover Carefully align cable...

Страница 26: ...pass filter This option is set at the factory to IN and should only changed if the system is used below 4 0 MHz in the absence of video 4 2 RECOMMENDED TEST EQUIPMENT Note The equipment listed below...

Страница 27: ...D INPUT BNC connector of the 455 Transmitter to a suitable 75 termination 2 Connect the BASEBAND OUTPUT BNC connector of the 455 Transmitter to the measuring instrument either an oscilloscope or wideb...

Страница 28: ...the entire composite signal consisting of L R L R pilot SAP and PRO channels If your stereo generator has a built in Bessel null calibration tone it may be used to accurately set the deviation of the...

Страница 29: ...to the appropriate input of the 455 Set the signal generator to provide a 1 kHz test signal at a 100 modulation level at both inputs The pilot should be switched off for this procedure and the SAP and...

Страница 30: ...ontrol Adjust the front panel screwdriver adjustment DEV for a minimum level 1st Bessel null at the center carrier frequency You have now adjusted the deviation for exactly 25kHz peak 50kHz peak to pe...

Страница 31: ...re using subcarrier levels of less than 50 mV p p proceed as follows 1 If the CXR ALM is displayed adjust SQUELCH counterclockwise until the Alarm extinguishes 2 With the Alarm off adjust the SQUELCH...

Страница 32: ...ocedure and the SAP and PRO channels should also be OFF C Use the AUDIO screwdriver control on the front panel to adjust the receiver output to 342 5 mv rms 968 6 mv p p 4 10 TRANSMITTER INTERNAL OPTI...

Страница 33: ...without video where the entire baseband is dedicated to subcarriers the filter should be jumpered in the OUT position The input highpass filter selection is made with P8 P8 is located directly in fro...

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