Kenwood TS-440S manual Crystal Filter Installation, Center frequency, Passband width

6.

The following accessories are available for more sophisticated operation of your transceiver.

6-1. CRYSTAL FILTER INSTALLATION

1.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 filter goes towards the

center and the CW filter towards the ec;jge of the board. Solder the filter in place, and cut off the ex- cess lead lengths.

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 eventually 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 optional crystal filter, move the white or blue lead, or both to the appropriate ter- minal as shown in the chart on page 28.

5.Replace the IF unit and secure with the seven screws removed in step 2.

6.Reattach the speaker lead, and replace the top cover.

Note:

Two terminals are provided for the WIDE and SSB jumper. Either of the two terminals may be used.

.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
.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)
A ttenuation			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 (-6dB)
Attenuation			bandwidth		:	4.2	kHz		(-60		dB)

Guaranteed attenuation : More than 80 dB

YK-88C

YK-88CN

YK-88SN

27