LBI-38673F
TABLE OF CONTENTS
Page
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
CIRCUIT ANALYSIS
PRESELECTOR FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
PREAMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
IMAGE REJECTION FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
INJECTION AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
INJECTION FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
DOUBLE BALANCE MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
FAULT DETECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
MAINTENANCE
TEST PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
ALIGNMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
TROUBLESHOOTING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
TABLE 2 - RETUNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
PRODUCTION CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
ASSEMBLY DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
MAINTENANCE MANUAL FOR
RECEIVER FRONT END MODULE
19D902782G3, G4, & G7
DESCRIPTION
The Receiver Front End (RXFE) Module amplifies
and converts the Rf signal to the first IF signal of 21.4
MHz. This is a down conversion process using low side
(G3, G4) or high side (G7) injection. The RXFE module
is powered by a regulated 12 volts. The RXFE printed
wiring board contains the following functional circuits:
•
Preselector Filter
•
Preamplifier
•
Image Rejection Filter
•
Injection Amplifier
•
Injection Filter
•
Double Balanced Mixer
•
Fault Detector
All but the Fault Detector circuit in the RXFE mod-
ule have 50 ohm impedance terminations.
E
Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-592-7711 (Outside USA, 804-592-7711)
Printed in U.S.A.
Summary of Contents for 19D902783G1
Page 6: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G1 19D902504 Sh 1 Rev 6 LBI 38643C 5...
Page 7: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G1 19D902504 Sh 2 Rev 6 LBI 38643C 6...
Page 42: ...RECEIVER FRONT END BOARD 19D902490G4 G7 OUTLINE DIAGRAM 19D902490 Sh 4 Rev 6A LBI 38673F 5...
Page 43: ...ASSEMBLY DIAGRAM RECEIVER FRONT END MODULE 19D902782G3 19D902782 Sh 1 Rev 6 LBI 38673F 6...
Page 44: ...ASSEMBLY DIAGRAM RECEIVER FRONT END MODULE 19D902782G4 G7 19D902782 Sh 2 Rev 6 LBI 38673F 7...
Page 45: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G4 G7 19D904768 Sh 1 Rev 6 LBI 38673F 8...
Page 47: ...SCHEMATIC DIAGRAM RECEIVER FRONT END MODULE 19D902782G3 19D903498 Rev 7 LBI 38673F 10...
Page 48: ...This page intentionally left blank LBI 38673F 11...
Page 56: ...ASSEMBLY DIAGRAMS LOW PASS FILTER MODULE 19D902856G3 19D902856 Sh 1 Rev 0 LBI 38674F 7...
Page 71: ...ACCESSORIES ANTENNA SWITCH 19B235897P2 LBI 38675E 9...
Page 80: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 1 Rev 3 LBI 39123E 7...
Page 81: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 2 Rev 3 LBI 39123E 8...
Page 82: ...SCHEMATIC DIAGRAM RECEIVER IF MODULE 19D902494G7 G11 193D1065 Sh 3 Rev 3 LBI 39123E 9...