Kenwood TS-950S Digital Reference manual

ASB-982

Service Bulletin Amateur Radio

Division

Subject: TS-950S/SD TX IMAGE ON 18.115MHZDate: 02/06/91

Some TS-950SD owners have reported a transmit image at

18.115MHz that causes the receiving station to hear

distortion on the carrier. If the operating frequency is

shifted 3KHz above or below 18.115MHz, the image

disappears. This modification will lower the image level

from -30dB (worse case) to better than -40dB by

installing a trap on the 455KHz I.F.

REQUIRED PARTS:

4pF TRIMMER CAPACITOR C05-0308-05

40pF TRIMMER CAPACITOR C05-0309-05

2.2uH COIL L40-2292-14

MODIFICATION:

1. Disconnect the power cord and antenna.

2. Remove the top and bottom covers (18 screws).

3. Locate the I.F. board on the bottom of the

transceiver. This is the back right board of the 4

boards on the bottom of the transceiver. Figure 1

4. Locate L36 by connector CN17 on the I.F. board.

Figure 2

5. Install and solder into place a 4pF trimmer

capacitor across L36. Figure 3

6. Install a 2.2uH coil and 40pF trimmer capacitor in

series from the output of L36 to ground. The can of

L31 can be used for ground. Figure 3

ALIGNMENT:

1. Connect the TS-950S/SD to a power meter and 50 ohm

load.

2. If you are working on the TS-950S Digital, connect

the DSP cables on the bottom cover to the back

panel. PAGE 1 OF 2

This modification is covered under the 1 year warranty.

Time required for this modification is 1 hr. or less. (C)

020691EWP

In the CW mode, adjust the front panel power control for 150W while the ALC level

is just at the starting point on the meter. This will create the highest image

level condition.

4. Using a monitor receiver with narrow filters

installed and AGC set to off, tune the receiver to

the image frequency.

5. Alternately adjust the two trimmer capacitors until

the image cannot be heard. This procedure may need

to be repeated several times.

6. Push the wire harness around the I.F. board toward

the chassis of the transceiver.

7. Assemble the transceiver.

FIGURE 1 FIGURE 2

FIGURE 3 SCHEMATIC

PAGE 2 OF 2

Copyright (C) 02/06/91 EWP for Kenwood U.S.A.

Corporation.

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