matt.hocker
I'm New Here
I have a Garmin SL40 which works great for frequencies above about 120.00 but below that, I get a nasty buzzing sound when I try to transmit. The recipient hears nothing.
Receiving works fine. I took the radio in for service and it bench tested perfectly. The radio person advised me to install a small aluminum plate inside the aircraft, under the antenna because the composite structure that I have the antenna attached to doesn't provide any grounding.
I'm having trouble understanding why this would be. For example, my handheld radio has no such grounding plate and it works fine at any frequency. Also, why would this affect just low frequencies?
If this is required, how big should this plate be? Is there a pre-made one commercially available?
Thanks for your help.
Receiving works fine. I took the radio in for service and it bench tested perfectly. The radio person advised me to install a small aluminum plate inside the aircraft, under the antenna because the composite structure that I have the antenna attached to doesn't provide any grounding.
I'm having trouble understanding why this would be. For example, my handheld radio has no such grounding plate and it works fine at any frequency. Also, why would this affect just low frequencies?
If this is required, how big should this plate be? Is there a pre-made one commercially available?
Thanks for your help.