Installation - Kenwood TKR-740 Service Manual

RX M ODIFICATION FOR EXTERNAL
PRESELECTOR FILTER
This model may be modified to use an external pre-selector
filter.
1 Remove the RX cover panel.
2 Remove the flat clip spring from IC4 and L16
3 Remove the 11 screws from the RX unit and the 10 screws
from the shield case.
4 Remove the jumper (R179) from the reverse side of the RX
unit.
5 Insert an SMB receptacle (E04-0409-05) at CN10. Solder
the 5 leads in place.

INSTALLATION

screw x10
Foil side view
IC17
R179
(0Ω)
RX UNIT
(X55-305)
RX.IN Signal cable
CN1
6 Replace the screws on the RX unit and shield case, and the
flat clip spring on IC4 and L16.
7 Move the RX IN signal cable (from the back panel) from
CN1 to CN10.
8 Connect a tracking generator signal to RX IN, then use a
spectrum analyzer to read the output at CN2 while adjusting
L16 for the proper response.
9 Next, adjust IF , squelch , and RSSI.
0 Replace the RX cover panel.
PANEL
flat clip spring
shield case
flat clip
spring
IC4
screw x11
L3
screw
L16
SMB Receptacle
(E04-0409-05)
CN10
L3
L16
CN2
TKR-740
screw x14
3