Icom IC-751A Instruction Manual page 49

li: ....
-:ïl
J13
NORMAL~
REVERtE SJ
~
NORMAL
S4 RtVERSE
(1) FL-52A, FL-53A INSTALLATION
(2) FL-63A INSTALLATION
(3) FL-70 INSTALLATION
If: ..•.
~ ~
S3 S4
IC3
0
~ W97
G------E>- -
-o W98
"-.._/
o - - - ~ W 9 9
~
S3: Reverses the IN and OUT positions of the FIL TER SWITCH
when using the AM mode.
\
S4: Reverses the IN and OUT positions of the FIL TER, SWITCH
when using the CW or RTTY mode.
These are 455kHz filters for use with the CW NAR ROW or RTTY
NAR ROW mode.
No special tools are required to successfully complete the installa-
tion of these filters. lnstall them at position [F] in the photo.
1) First, remove the top cover.
2) lnsert the optional FL-52A or FL-53A into position [F] as
shown in the photo.
3) Check the operation of the filter using the FIL TER COMBINA-
TIONS TABLE for a guide. If necessary, refer to SECTION 6 - 4
CW OPERATION for instructions on how to select the CW
NARROW and RTTY NARROW modes.
This is a 9MHz narrow filter for the CW or RTTY mode. The filter
replaces the standard FL-32A which is supplied with the IC-751A.
lnstall this filter at [A] position.
1) Remove the top cover, then the 11 screws from the MAIN unit.
2) Lift the right edge of the MAIN unit upwards taking care not to
damage the sockets and plugs that are installed on the unit.
3) The filter must be installed at position [A] in the photo, there-
fore remove the FL-32A original filter from the MAIN unit using
de-soldering braid.
4) lnstall the FL-63A at position [A]. Orient the label on the filter
in the same manner as the other filters already installed.
5) Bend the leads and mounting tabs flush against the opposite side
of the printed circuit board, and solder. Trim the ends of the
leads with diagonal cutters.
6) Replace the MAIN unit and screws, and the top caver.
There are no adjustments required after installation is completed.
This is a 9MHz wide filter for SSB which may be installed in one of
two ways:
a)
To replace the standard FL-80 with the FL-70.
b) To replace the standard FL-32A with the FL-70.
a: Use the FL-63A installation method given previously. Place the
FL-70 in the position where the FL-80 is now installed.
b: 1) Use the FL-63A installation method given previously. Place
the F L-70 in the position where the F L-32A is now installed.
2) The FL-70 operates only on CW or RTTY if it is installed in
the F L-32A location.
Therefore, perform the following modification so the FL-70.
may or may not be used as desired.
-45-