Kenwood TS-830S Instruction Manual page 24

5.2 INSTALLATION OF ACCESSORIES
@ REMOVING THE CABINET (See Fig. 5-1)
Figure 5-1 illustrates cabinet removal. Remove the eight
top-cover and eight bottom-cover screws and lift away the
panels.
This product uses metric hardware.
CAUTION: -
The speaker lead is attached to the chassis, so be carefu
when removing the top cover.
The lead can be unplugged, if necessary.
Fig. 5-1 Removing the Case
® OPTIONAL FILTER INSTALLATION
1. Using a number 2 Phillips screwdriver, remove the top
cover (eight screws). Unplug the speaker and set the
cover aside.
2. Remove the bottom cover (eight screws).
4. Using a 45-W (or less) soldering pencil, clear the six
holes for the filter, if they are filled with solder.
5. YK-88C, CN: ther is no polarity to the filter. Install the
filter into its position on the IF unit. Solder the two
mounting tabs and the four input and output pins to the
circuit boards.
Solder sparingly, and heat the connections only long
enough to insure a good solder joint. Don't overheat
the filter or circuit board.
YG-455C, CN:
Install the filter into its position on the IF unit. Tighten
the two nuts, and solder the four input and output pins
to the circuit boards.
6. Carefully inspect your soldering. Be certain that all pins
are actually soldered, and that you have not soldered
across any spots on the board or between any of the
pins on the filter. Clip the pins flush to the board.
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7. Replace the IF unit. Make certain no wires will be
pinched underneath the board. Replace the six screws.
8. Move the connector as illustrated from CW1 to CW2 ~
cw4.
9. Reinstall the bottom cover. Reconnect the speaker
lead, and reinstall the top cover.
10. Apply power and verify your work. Filter installation is
now complete.
voruse
yaussen
Total Receiver Characteristics
Passband|
2.4 kHz
Optional Filter (s)
Same as SSB and Wide CW.
Variable Bandwidth Tuning
(VBT) adjusts passband from
2.4 kHz to 500 Hz, retaining
shape factors of built-in
2.4-kHz filters in first
(8.83-MHz) IF and second
(455-kHz) IF.
Installed None
YK-88C (500 Hz)
in 8.83-MHz IF
General-purpose CW filter.
VBT not fully effective.
Narrow CW filter, with
general-purpose shape factor.
VBT not fully effective.
YK-88CN (270 Hz)
in 8.83-MHz IF
YG-455C (500 Hz)
in 455-kHz IF
Very sharp CW filter.
VBT not fully effective.
YG-455CN (250 Hz)
in 455-kHz IF
Very sharp, very narrow CW
filter. VBT not fully effective.
Excellent selectivity. Very sharp
passband. Maximum VBT
flexibility. which adjusts pass-
band from 500 Hz to 150 Hz.
Best overall combination.
YK-88C and
YG-455C
YK-88CN and
YC-455C
(Combination not
recommended)
Excellent selectivity and
narrow passband, but VBT not
flexible (too narrow on one
side of passband).
YK-88C and
YC-455C
(Combination not
recommended)
Excellent selectivity and
very sharp, narrow passband.
VBT not flexible (too narrow
on one side of passband).
ae
Optimum selectivity, most
sharp and most narrow
lowest noise floor,
best dynamic range. However,
greatest filter insertion loss
and very little VBT range
(adjusts no wider than 250 Hz)
...not good for contest
operation or "tuning around",
but excellent for high-speed
CW schedules requiring
narrowest, sharpest passband.
YK-88CN and
YG-455CN