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MC-44 Modifications | Radioaficion Ham Radio

MC-44 Modifications

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Modifications for the Kenwood MC-44

MC-44DM Microphone audio improvements

Trio-Kenwood Communication, inc.

Service Bulletin no. 958 (12-1-1990)

There are several ways to increase the transmit audio level when using an MC-44DM. If you are using a single band transceiver such as the TM-231A, you can turn up the deviation control inside the transceiver. Do not turn up the deviation controls in dual banders such the TM-731A because the audio will distort during repeater cross band operations.

Inside the microphone, there is a felt pad lightly glued to the microphone element housing. Removing the pad will increase the audio level.

If more level is desired, the microphone element can be changed to a more sensitive element. The element can be ordered though Kenwood's Parts Department.

ECM (microphone element) Part# T91-0393-08

 


MC44/MC44DM Intermittent modulation

Kenwood Communication, inc.

Service Bulletin no. 1022 (18 May 1993)

Symptom:
Microphone audio is mechanically intermittent, i.e. striking the microphone will cause audio to be lost or restored.

Cause:
The lead wire of capacitor C8 might be shorting out against the case of the ECM unit.

Correct action:
Re-install the capacitor so that the leads cannot touch the ECM case.

 

Modifications for the Kenwood MC-44 Make sure the leads of C8 100 pF capacitor do not touch the ECM case.

 

Time required for this modification is 15 minutes or less.

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