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MC-50 VOX-3 Sensitivity and Delay | Radioaficion Ham Radio

MC-50 VOX-3 Sensitivity and Delay

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Modifications for the Kenwood MC-50

VOX-3 Sensitivity and Delay

Trio-Kenwood Communication, inc.

Service bulletin no. 15
(26-5-1977)

There have been a few instances of improper VOX operation when the MC-50 microphone is used. The sensitivity of the VOX-3 may be increased by removing R-4 and connecting R-3 directly to ground.

Also install a 220mfd 25Vdc electrolytic in parallel with C-6.

(These parts are all on the X54-1010-00 board.) If the VOX delay is insufficient, change C-10 (on the X54-0001-00 board) from 3.3mfd 50Vdc to a 10mfd 50Vdc capacitor. Shown below is a modified schematic showing these changes.

Kenwood MC-50  VOX-3 Sensitivity and Delay

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