Raytheon IDS M3-UHF-450 100W UHF BASE STATION User Manual Maintenance

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Document ID	1612503
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Document Description	Users Manual Maintenance
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Document Type	User Manual
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Filesize	10.28kB (128473 bits)
Date Submitted	2011-12-30 00:00:00
Date Available	2011-12-30 00:00:00
Creation Date	2011-11-03 14:15:58
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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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