Filter
Top Products
To remove the IF Filter board from the radio:
1. Remove the eight screws (E) holding the IF Filter bottom
cover.
2. Remove the six screws (F) holding the IF Filter top cover.
3. Remove the three screws (G) and the Connector (H), and
carefully push down on the top of the board to avoid
damaging the feedthrough capacitors.
To remove the optional UHS pre-amplifier board:
1. Remove the eight screws (E) holding the IF Filter bottom
cover, and the six screws (F) holding the IF Filter top cover.
2. Disconnect the two connectors and 10 Volt lead (J).
3. Remove the three screws on the bottom side of the board,
and lift out the board.
MODIFICATION INSTRUCTIONS
Figure 3 - Disassembly Procedure
(Bottom View)
Figure 4 - Receiver Module Location Diagram
MODIFICATION INSTRUCTIONS FOR UHF HIGH SIDE INJECTION APPLYING 19A130045G5 KIT. THIS
MODIFICATION IS NOT REQUIRED FOR RECEIVERS OPERATING IN THE FOLLOWING RANGES.
450 TO 458.8 MHz
470 TO 482.8 MHz
494 TO 500.8 MHz
1. FOR RECEIVERS OPERATING BETWEEN 458.8 TO 470 MHz (OSC/MULT BD’S 19D423266G2 & G6):
A. IF THE RECEIVER HAS LESS THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2315 (13 pF, -N80). REPLACE C412 WITH C2316 (5pF, NPO).
B. IF THE RECEIVER HAS MORE THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2317 (8pF, N80). REPLACE C412 WITH 2316 (5pF, NPO)
2. FOR RECEIVERS OPERATING BETWEEN 482.8 TO 494 MHz (OSC/MULT BD’S 19D423266G3 & G7):
A. IF THE RECEIVER HAS LESS THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2318 (10pF, N80). REPLACE C412 WITH C2319 (4pF, NPO).
B. IF THE RECEIVER HAS MORE THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2320 (6pF, N80). REPLACE C412 WITH C2319 (4pF, NPO).
3. FOR RECEIVERS OPERATING BETWEEN 500.8 TO 512.0 MHz (OSC/MULT BD’S 19D423266G4 & G8):
A. IF THE RECEIVER HAS LESS THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2317 (8pF, N80). REPLACE C412 WITH C2321 (3pF, NPO).
B. IF THE RECEIVER HAS MORE THAN 8 ICOMS, REMOVE C407, C412, C417.
REPLACE C407 WITH C2316 (5pF, N80). REPLACE C412 WITH C2321 (3pF, NP0).
4. SOLDER ALL ELECTRICAL CONNECTIONS. DISCARD CAPACITORS NOT USED.
5. IN APPLICATION OF THIS KIT THE CRYSTAL OSCILLATOR FREQUENCY MUST BE CHANGED PER THE
FOLLOWING FORMULA:
FX= Fo + 11.2
27
6. MARK ALL OSC/MULT BD’S (19D423266) WITH A BLUE COLOR DOT IN THE AREA OF THE PL DRAWING NO.
PER 19A115740P1.
7. APPLY LABEL (19A130206P3) TO SIDE OF PLASTIC FRAME.
8. TEST AND ALIGN PER NORMAL PROCEDURE.
HIGH SIDE INJECTION
LBI-38505 LBI-38505
3