ADVANCED SYSTEM DESIGN PRODUCT SPECIFICATIONS MBE*/*

Transcription

1 STARLINE MiniBridger Express Amplifier FEATURES OF THE : 870 MHz bandwidth 28 db operational gain for trunk port, 37 db operational gain for bridger ports 16 db return loss 60/90 V powering Meets Telcordia GR-1098-Core voltage surge requirements using surge waveforms as described in IEEE C62.41 FCC and CENELEC approved Bode equalization (thermal or auto controlled) 15 ampere capability Directional coupler -20 db test points Power factor corrected power supply DESCRIPTION Motorola s STARLINE series MiniBridger Express, model, provides a true two-stage trunk output with superior distortion performance, along with two high-gain bridger outputs in a MiniBridger (MB*/*) housing. Even though fiber is being driven deeper in many networks, there remains a large number of operators worldwide who require flexibility from a wide variety of RF building blocks. The MBE is one of many Motorola building blocks. With 870 MHz bandpass and a power factor corrected power supply, the MBE provides system designers with another powerful tool to deliver reliable, cost-effective HFC networks. 60/90 VOLT POWERING The is capable of 60 or 90 Vac powering. The MPPS II 60/90 Volt power pack provides a regulated 24 Vdc output at 2.0 Amperes maximum over an ac input voltage range from 38 Vac through 90 Vac rms. The power supply also contains the additional feature of a two-position ( and ) selector that sets the startup voltage of the power supply. The is shipped with the selector set for 60 Vac (). There is no damage to the amplifier if the jumper is not changed. However, changing the jumper ensures that the dc supply does not turn on until the proper input voltage level is reached either 38 Vac or 55 Vac. This prevents excessive loading of the system power supply during turn-on after a system shutdown. The standard gas discharge tube surge arrestor can be replaced with the Fast Transfer Electronic Crowbar (FTEC-BTA) type surge suppressor for longer life over- voltage protection. POWER FTOR CORRECTION The STARLINE MiniBridger Express provides power factor correction in the power supply design. This feature lowers the current draw of the amplifier and improves the overall system power supply efficiency. 1 June 23, 2004

2 STARLINE MiniBridger Express Amplifier DIRECTIONAL COUPLER TEST POINTS Other features include -20 db directional coupler test points. The is enclosed in the MB-HSG which allows access to test points without opening the housing. FORWARD PATH The operational gain of the STARLINE MiniBridger Express is 28 db for the trunk port, and 37 db gain for the bridger ports with 16 db of return loss at all ports for maximum RF power transfer. Output level control is achieved through the use of an interstage Bode equalizer which compensates for coaxial cable attenuation changes due to temperature. Equalization may be controlled manually, with a thermal drive unit (model TDU) or with a single pilot closed loop automatic drive unit (model ADU-XXX/*). Both the TDU and the ADU boards are common to the STARLINE family of amplifiers. ADUs utilize Surface Acoustic Wave (SAW) filters for determining pilot frequency. This improves amplifier stability over temperature and enhances the amplifier's distortion performance during temperature changes. The uses modular diplex filters which can be changed for a different frequency split as required. The amplifier can be configured with S-split filters for a 5-40 MHz return and a MHz forward band. K-splits (5-42 MHz/ MHz) and A-splits (5-65 MHz/ MHz) are also available. These same filters can be used for all Motorola RF distribution amplifiers. To further ensure system flexibility, installation ease and maintenance, the amplifier is engineered for compatibility with standard accessories, such as attenuators, equalizers, ADUs or TDUs, return amplifiers, automotive fuses, and FTEC-BTA crowbar circuits. RETURN PATH Return amplifier kits can be ordered with high gain hybrids providing 18 db minimum station gain. Return path equalizers from 0 to 12 db can be customer selected. Optional thermal compensation comes in the form of a plug-in -TH*C, which stabilizes gain and match over temperature extremes. CONFIGURATION To reduce customer costs and to accommodate customer specific needs, the STARLINE can be configured for certain accessories in Motorola's factory at no additional cost to the customer. Please refer to the configurator for options (see attached). 2

3 STARLINE MiniBridger Express Amplifier Block Diagram MANUAL ADU AUTO PORT 1 RF/ RF EQ MDR BODE PORT 2 RF RF/ PORT 3 RF/ RF FUSE SURGE PROT 24 Vdc POWER SUPPLY SEE THERM LPF SURGE PROT FUSE PORT 4 RF/ RF FUSE FUSE PLUG-IN MODULE 3

4 STARLINE MiniBridger Express Amplifier STARLINE MBE87S/* SPECIFICATIONS 3 Output Express Amplifier MiniBridger Express Amplifier FORWARD RETURN PARAMETER UNITS NOTE TRUNK BRIDGERS (RA-KIT/H) Passband MHz Flatness db 2 ± 0.5 ± 0.75 ± 0.75 Minimum Full Gain db Operational Gain db Manual Bode Slope Control Range db 5 ± 4 N/A Interstage Equalizer Slope db ± 1 N/A Noise Figure 40/52/870Mhz db 7 N/A / 12 / / N/A / N/A Reference Frequency MHz 8 870/550/52 870/650/52 40 Channel Loading 77 NTSC w/ 320MHz 96 NTSC w/ 220 MHz 6 NTSC Compressed Data TRUNK/BRIDGER Compressed Data TRUNK/ BRIDGER Output Level 30.5/35/ /44/ /35/ /44/35 35 FLAT Distortion CTB dbc 9, N/A XM dbc 10, CSO dbc 9,11, N/A CIN dbc 12 N/A N/A N/A N/A N/A STB dbc 9 N/A N/A N/A N/A 76 SSO dbc 9 N/A N/A N/A N/A 78 Test Point (all) db 13 Return Loss (Minimum) db 14 Hum Modulation dbc 15,20 DC Voltage VDC 16 Current DC ma DC Ripple mv 15 P-P Power Consumption W Input Voltage Range V Current V A V A 0.69 V A 0.89 V A 1.03 V A 1.32 V A Bypass Current A 15 Group Delay, Typical 19 Housing Dimensions 20 ± ± Channel 2 (HRC) nsec 25 N/A Channel 3 nsec 16 N/A Channel 4 nsec 10 N/A Channel 5 or > nsec 3 N/A Channel T11 nsec N/A 20 Channel T10 nsec N/A "x5.51"x9.59" 15 Pounds Ambient Operating Temperature -40 to +60C 4

5 STARLINE MiniBridger Express Amplifier 1. Operating passband of station. Diplex filters are plugged into the electronic chassis. 2. Referenced to the average gain across the stated passband. 3. Minimum full gain at 870 MHz includes loss of equalizer but Bode slope reserves have not been set. Return gain includes loss of SRE-*-4 return equalizer. 4. Operational gain includes loss of slope reserves as well as equalizer. 5. Amount of Bode slope control range from midpoint (typical setting is -4 db at C). This control should not be used for gain reduction. 6. Amount of slope created and cable equivalence of fixed interstage equalizer. Interstage equalizer is a plugin. 7. Noise Figure performance is specified typical. Noise Figure is specified at the cable entry facility of the housing and includes the loss of 1 db for the pre-stage equalizer. The return Noise Figure includes the station loss preceding the RF hybrid. 8. Frequencies that relate the picture carriers or passband edges to the specified output levels and tilts. 9. Measured with CW carriers and spectrum analyzer. Specifications are compliant with the test methods as stated in NCTA RECOMMENDED PRTICES FOR MEASUREMENTS ON CABLE TELEVISION SYSTEMS. 10. Measured with wave analyzer and synchronous, 100% depth modulated channels. Specifications are compliant with the test methods as stated in NCTA RECOMMENDED PRTICES FOR MEASUREMENTS ON CABLE TELEVISION SYSTEMS. 11. Composite Second Order distortion refers only to those beat clusters that fall MHz and MHz above the subject picture carrier. CSO beat clusters that have a MHz and MHz relationship to the subject picture carrier are not included in this specification. 12. CIN (Carrier-to-Intermodulation Noise). Contributions of data compression to noise floor. Performance varies on a two-for-one basis with amplifier output level and should be calculated in a cascade using a 20 log function, but CIN should be added to the high channel C/N calculation on a 10 log basis. 13. Test points should be used with GFAL adaptor. 14. Return Loss at the station input and output, cable-entry facilities, is stated worst case over the specified passbands for operational gain. When ordering the 10-amp bypass current option, return loss is 14 db when installing the electronics package into the MB-550D-H or MB-750D-H/* housings. 15. Measured with the stated Bypass Current. 16. Measured at the power connector. 17. Current draw at VDC. 18. current is stated in RMS continuous. 19. Group Delay is specified for standard NTSC video, where delay is the delta from picture carrier to 3.58 MHz color subcarrier. 5

6 STARLINE MiniBridger Express Amplifier 20. Hum Modulation performance is stated typical. Return band specified from 15 MHz. Hum Modulation (5 MHz to 15 MHz) is 55 dbc. 21. Distortion numbers are worst case over temperature in a cascade. 22. The compressed data loading is QAM carriers and are 6 db relative to the analog CW carriers. 6