Raytheon IDS M3-UHF-450 100W UHF BASE STATION User Manual Maintenance
JPS COMMUNICATIONS, INC. 100W UHF BASE STATION Users Manual Maintenance
Contents
Users Manual Maintenance
S. MM102244V1, Rev. 5 ~ 5 10.0 MAINTENANCE 10.1 10.2 CMOS Integrated Circuit devices used in this equipment eon be destroyed by satic discharges Before handling one of these devices, the service person stould discharge himself by touching the use of a bench test instrument that has a 3-prong power cord cormected to an outlet with a known good earth gmund. When soldering or de- soldering a mos device. the soldering iron should also have a 3-prong power cord connected to an outlet with a known good earth ground. A battery-operated soldering iron may be used in place of the regular soldering iron. STATION METERING The MASTR ll] station monitors certain DC voltages in the station and displays them. These voltages are used as follows: PWR - Circular voltage which is proponional to the Reflected power- at the output of the optional MASTR Ill Circulator. RX - Receiver RSSl (DC voltage proponional to the strength of the signal into the receiver). TX - Transniuer forward power (DC voltage tropottional to the power output of the station). This feature available only on MASTR Ill Stations with UHF PA’s 09090279763. 7, 9. ll) of the 300 MHz M3 PA (I9D902797GS). The TIR shelf must have the new CBloll26Vl Backplane or the old l9D902947Gl, Rev C Badtplane and the 19D90297SGI. Rev C Interface Board. Refer to section 4.0 DESCRIPTION. EXT - VCO tuning voltage (also can be used to monitor an extemal DC level). EXT - VCO Timing voltage from the 2nd slot h'orn the left on the T/R shelf (also can be used to monitor an external DC voltage by removing jumper 113 on the backplane). This feature requires the CBIOI 126V] Backplane. Note: To use the ID(T metering function to tune the station VCO’s requires the I9D90259006 Sysern modtles 19D90259OG3—4, remove R184 (198800607I’104, IOOKQ) on the I9D90377l board. RETUNING THE MASTR III STATION The following procedures may be used in the field to retune a station if a plug in motitIe has been repaired or replaced or the station fiequency has been changed The preferred method is to use the RF Test fixture and the module alignment found in the NOTE specific RF module maintenance manual. TX and RX Synthesizers can be tuned using the metering functions available with the Utility handset SPK9024, MASTRUTL (IQ-0619), or MSEDIT (TQ-0653). The VCO lune voltage fi'om the RX Synthesizer slot in the T/R shelf is connected to the external metering jack (EXT_JCK) in the synem module. The synthesizers can be tuned using the Ext Metering fimction of the Utility handset, MASTRUT'L, or MSEDlT. if one desires to use the EXTJCK input on P4 pin 3 of the Metering plug on the station baekplane to monitor an external voltage, jumper JMP3 on the backplane must be cut and the signal to be measured must be connected to P4 pin 3. ”ARRIS' MM102244V1, Rev. 3 10.2.1 800 MHz stations 1) Program the station for the desired RX and TX frequencies or a frequency pair that is in the center of the desired fi'equencies. Programmable bandwidh is ( 500 kHz 2) Place the RX Synthesizer on an extender card. Altemately‘ one can remove RX FF. and RX IF modules from the TIR shelf gain access to the trimmer slug on the Synthesizer module 3) Adjust the RX Synthesizer trimmer until the LED on the front of the module goes "out". 4) Monitor the EXT metering field and adjust the trimmer slug for a reading of 5 VDC on the EXT meter. Alternately, adjust the trimmer slug for areading of 5 VDC on 13 pin 23A 5) Ranove the RX Synthesizer module and the TX Synthesizer module and place the RX Synthesizer module in the slot farthest to the left Place the TX Synthesizer module in the next slot to the right. Comed the Ref ln/Out U-link. 6) Key the station with the REM P'I'l' witch on the System modile (or by grounding the DP'IT output from the SITEPRO on simulcast stations) 7) Monitor the EXT metering field and adjust the trimmer slug on the TX Synthesizer for a reading of 5 VDC on the EXT meter Alternately, adjust the trimmer slug for a reading of 5 VDC on 13 pin 13A Front End: No Timing required for Front End or IE 10.2.2 UHF statlons Smthesizers: TX Synthesizer: No tuning is required for the TX Synthesizetn RX Synthes'zer: Same ts 800 MHz for the RX Synthesizer with one addition. The cover must be removed and two slugs (FLl) must be tuned for peak output level using a spectrum analyzer or RF voltmeter. Programmable bandwidth is 2 MHz figure 7 - Rx Syntjteslzer FLI 41 s. MM102244V1, Rev. B b 42 Front End: The preferred method of tuning for the RX From End is using the MASTR lll module test fixture and associated procedures This is required to wveep tune stations for more than one RX frequency. However, whm using one fi'equency, one can peak tune the RX Front End as follows (reference alignment procedure in LBl~38673): 1) Place the RXFE on an extender card and connect the L0 out of the RX Synthesizer and the IF out of the Front End to the IF module with 500 coax. 2) Preset the Front End tuning slugs per the appropriate RX FE maintenance manual. 3) Using an RF signal gmerator, put in an "on channel" RF fignal into the RF In on the Front End module 4) While monitoring the R58! metering function, adjust the RF level of the generator to the responsive range of the meter 5) Tune the Front End tuning slugs for a peak on Ihe RSSI meter' reduce the input signal level as necessary to keep the meter in the responsive reading range. 6) The lF requires no tuning 10.2.3 VHF statlons Smthesizers: TX Synthesizer: “thing is not required for the TX Synthesizer but the Dip switches mus. be set as follows: 142-152 136444 RX Synthesizer: Same as 800 MHz for the RX Synthesizer Programmable bandwidth is 1] MHz Front End: Same as Ul-IFi
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