Kenwood TS-890S Manual

Supplementary Info.

Subject:

TS-890S MARS Modification

This modification is provided "as is," and is subject to change without notice. Kenwood USA Corporation makes no warranty of

any kind with regard to this modification procedure, including, but not limited to, the implied warranties of merchantability and

fitness for a particular purpose. Kenwood USA Corporation shall not be liable for any error or for incidental or consequential

damage in connection with the furnishing, performance, or use of this modification procedure.

It is illegal to operate outside the limits of your class license or permits.

Upon completion of this modification and turning power back on, the TS-890S will need a full reset, returning all memory

contents and menu settings to their original factory default values. Please refer to user manual for Full Reset procedure.

To enable the MARS capability of the TS-890S, the transceiver will need to be placed upside down so that it rests on its top

cover. Before performing this modification, take some time to arrange a suitable work surface clean of anything that may scratch

the cover. The TS-890S is heavy, seek help to move and turn the transceiver in a careful manner to avoid any damage to the

covers and front panel.

1.

Disconnect the power cord, antenna(s) and any other cables and devices attached to the transceiver.

2.

Carefully turn the transceiver over so that it rests on its top panel.

Remove the bottom (6) and side (6) case screws. That's a total of 12 screws that need to be removed and set aside in a

3.

small container.

4.

Carefully remove the bottom cover, and set it aside in a safe place and position as not to become scratched or dented.

5.

On the right hand side of the transceiver locate a shield plate that covers the Control board. Remove the 7 shield screws

and set them aside in a small container.

6.

Carefully lift up on the shield plate and remove it from the transceiver. Take note of the cushion placement under the

shield plate that holds down the flat cable. You will need to reposition it in the same place upon assembly. Now you can

set the shield plate aside in a safe place.

7.

Locate R55 on the control unit (see figures 1 & 2).

8.

Using surface mount soldering techniques and soldering tools, carefully remove R55. You may want to use two

soldering irons or one soldering tweezer tip to heat the solder on both sides of R55 at the same time to lift it up. Be

careful that you do not tear the foil traces. Also be careful to not burnp, pull, or rip any ribbon cables as you work to

remove the resistor.

9.

Assemble the transceiver by reversing the steps above. Carefully squeeze the sides of the bottom panel to fit them inside

the top panel. Loosely insert all case screws and align the fitting of the bottom cabinet before tightening all case screws.

10. Connect DC Power and perform Full Reset to the TS-890S before operating with the MARS modification.

Transmit Operating Ranges:

LF Band:

100kHz to 522kHz LF Band can only transmit from drive out terminal, not the antenna terminal.

HF Band:

1.705MHz to 30MHz

50MHz Band:

49MHz to 54MHz

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ASI-0109

Amateur Radio Division

Date: November 8, 2018