Crystal Filter Installation - Kenwood TS-440S Instruction Manual

6. OPTIONAL ACCESSORIES
The following accessories are available for more
sophisticated operation of your transceiver.
6-1. CRYSTAL FILTER INSTALLATION
. Remove the top cover from the radio. Be careful
of the speaker lead, which may be unplugged.
2, Remove the seven screws securing the IF unit to
'the chassis.
3. Install the crystal filter in the appropriate location
on the IF unit. The SSB fitter goes towards the
center and the CW filter towards the edge of the
board. Solder the filter in place, and cut off the ex-
cess lead jengths.
Note:
When soldering use a low wattage iron (40 watts
or less), and a high quality rosin core solder. Do not
use acid core solder as. this will eventyally cause
damage to the circuit board. Solder quickly, but en-
sure that you have a good solder connection. if the
connection is dull, or looks crystalized you will have
to remove the solder and try again.
4. When installing the optionat crystal filter, move the
white or blue lead, or both to the appropriate ter-
minal as shown in the chart on page 28.
. Replace the IF unit and secure with the seven
screws removed in step 2.
. Reattach the speaker lead, and replace the top
cover.
Note:
Two terminalis are provided for the WIDE and SSB
jumper. Either of the two terminals may be used.
a
a
= YK-88C CW FILTER
Center frequency > 8,830.7 kHz
Passband width : 500 Hz (—6 dB)
Attenuation bandwidth : 1.5 kHz {— 60 dB}
Guaranteed attenuation : More than 80 dB
m YK-88CN CW NARROW FILTER
Center frequency : 8,830.7 kHz
Passband width : 270 Hz (-6 dB}
Attenuation bandwidth =: 1.1 kHz {(-60 dB}
Guaranteed attenuation : More than 80 dB
= YK-88SN SSB NARROW FILTER
Center frequency : 8,830.0 kHz
Passband width : 1.8 kHz (—6 dB)
Attenuation bandwidth : 3.3 kHz (-—60 dB)
Guaranteed attenuation : More than 80 dB
= YK-88S SSB FILTER
Center frequency : 8,830.0 kHz
Passband width : 2.4 kHz (—6 dB)
Attenuation bandwidth : 4.2 kHz {— 60 dB)
Guaranteed attenuation : More than 80 dB
IF unit
White lead Blue lead
YK-88C
YK-88CN
YK-88SN
a7