Steve Pierce
BENEFACTOR
Graham, TX
[FONT=Arial, Helvetica, sans-serif]Been putting some time on my new to me Super Cub and keep noticing what sounds like a stuck mic on 123.45 when flying with my friends. No one else is hearing it. Sunday I did some investigating with the engine off and a handheld radio. The interference is between 123.625 and 123.400. I pick it up on the ship's radio and a handheld radio. Engine was off and I started pulling circuit breakers. The transmission goes away when I pull the [/FONT]Electronics International[FONT=Arial, Helvetica, sans-serif] CGR30P engine monitor circuit breaker and back on when I push it back on. From conversation with Jason, the previous owner, he noticed this after I installed the new engine with a SureFly electronic ignition module with the resistor from Electronics International back in May. I sent an email to EI and got this back. I need to source the cooper tape and proceed with troubleshooting. Curious if anyone else has had an issue and possible fix.
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[/FONT]I do not think that this corresponds with your electronic ignition install. The CGR passes all the FAA's RF testing and falls below all acceptable radio emissions, but there could be particular frequency bands with a concentration of energy - with the wiring coming out from the CGR, this acts as a bundle of antennas which is likely amplifying this concentration for your highly-sensitive radios to pick up. I spoke to engineering and they suggest using copper tape to wrap (or otherwise shield) the wire harness coming out from the CGR-30P. This should help to contain any natural emissions from the instrument and keep them well below the level of radio susceptibility.
Please let us know if we can help out with anything else. Thanks again![FONT=Arial, Helvetica, sans-serif]
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