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Uniden Marine VHF radio problem

When I key the mic on my radio, the remote throttle control(servo) on my 9.9 kicker motor looses power and it slows down. On 5 watts it isn't too bad, but on 25 watts it slows right down to an idle. What gives????THANKS for your help.

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Hello jbirdup,

It sounds like the Radio Frequency (RF) energy being radiated by the transmitter is interfering with the electronics in the motor's remote servo. Anyone who has ever had their television reception interfered with by a neighbor's CB radio can attest that even relatively low powered transmitters can disrupt electronics equipment, although in these days of broadband cable fewer people have experienced this.

While most electronics devices have at least some shielding, the closer the two devices are to each other the more likely this type of interference can occur. I would recommend trying to relocate the antenna as far away from the motor / throttle as possible. You have already determined that operating on lower power helps.

I'd also recommend inspecting your coaxial feed line to make sure that the connectors are installed tightly and that the jacket on the cable is not cracked or broken. Depending on the age of the cable the outer insulation and jacket could be corroded or cracked and this can be a prime way for RF energy to "leak" out of the feed line. If you find the cable is worn or broken, replace it.

These two steps should help eliminate or reduce the problem. You can also try contacting the manufacturer of the throttle control and ask what they recommend as far as shielding. There may be some additional steps (such as adding torroids to any wires leading to the throttle control) that can be effective in keeping RF energy out of the device.

Hope this helps,
Ken
"Go Ahead. Use Us."

Posted on Jul 07, 2008

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