Home » Ham Radio Mods » Kenwood Mods » Kenwood TH-K20A - MARS / CAP TX Modification
Kenwood TH-K20A - MARS / CAP TX Modification [message #1396] Thu, 05 July 2012 01:19
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Registered: December 2004
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This modification is provided "as is," and is subject to change without notice. The author makes no warranty of any kind with regard to this modification procedure. The author 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.

Procedure for the Kenwood TH-K20A Mars Mod:

Turn off the transceiver and remove the battery pack.

Remove the antenna, channel selector knob, and volume knob.

Remove the Side Jack Accessory Cover.

Remove the two screws from the bottom of the radio on the back side.

Carefully lift the front panel up from the chassis, starting at the bottom of the radio. Be careful not to damage the speaker wires as you're opening the radio.

Locate and carefully remove the Diode reference D from the TX/RX unit - (see Figure 1).

Assemble the transceiver.

Reset the radio.
Press and Hold the F Key While Turning the Radio On
Release the F Key
Use the Channel Knob to Select Full Reset (FL.RST)
Press F then Press F Key Again to Confirm Reset

Transmitter Operating Range: 142 ~ 151.995MHz

KENWOOD TH-K20A – Full Extended TX Modification

This modification is provided "as is," and is subject to change without notice. The author makes no warranty of any kind with regard to this modification procedure. The author 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. Procedure:

Turn off the transceiver and remove the battery pack.

Remove the antenna, channel selector knob, and volume knob.

Remove the Side Jack Accessory Cover.

Remove the two screws from the bottom of the radio on the back side.

Carefully lift the front panel up from the chassis, starting at the bottom of the radio. Be careful not to damage the speaker wires as you're opening the radio.

Locate and carefully remove both Diodes reference C & D from the TX/RX unit - (see Figure 1).

Assemble the transceiver.

Reset the radio.
Press and Hold the F Key While Turning the Radio On
Release the F Key
Use the Channel Knob to Select Full Reset (FL.RST)
Press F then Press F Key Again to Confirm Reset

Transmitter Operating Range: 136 ~ 173.995MHz

Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge, do not attempt this modification yourself Seek qualified assistance.

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