gnuse
Well Known Member
I am certainly no expert on these matters, so I hope the collective knowledge of this group can help guide me to a solution.
On a recent flight I realized that my RV-8's comm radios, a Garmin 430W and a Bendix/King KX135 with a PMA4000 audio panel, were not transmitting while airborne. They work flawlessly on the ground. Occasionally I will get some static filled partial transmission while airborne. Receiving is a good and clear as ever, on the ground or airborne.
Switching from Comm 1 to Comm 2 sounds about the same. The Tx indicator on the 430 and the KX135 is missing or blinking on and off depending on if the radio is actually transmitting.
I started to find the problem today within my own limitations. I replaced the PTT switch in my Infinity grip without any effect. I replaced my Bose Lemo plug headset with a D/Clark in the standard plugs with no effect.
I tried various RPM settings in the air from 1200rpm to 2400rpm with no effect noted.
I could really use some help, as the plane is useless without the ability to communicate.
On a recent flight I realized that my RV-8's comm radios, a Garmin 430W and a Bendix/King KX135 with a PMA4000 audio panel, were not transmitting while airborne. They work flawlessly on the ground. Occasionally I will get some static filled partial transmission while airborne. Receiving is a good and clear as ever, on the ground or airborne.
Switching from Comm 1 to Comm 2 sounds about the same. The Tx indicator on the 430 and the KX135 is missing or blinking on and off depending on if the radio is actually transmitting.
I started to find the problem today within my own limitations. I replaced the PTT switch in my Infinity grip without any effect. I replaced my Bose Lemo plug headset with a D/Clark in the standard plugs with no effect.
I tried various RPM settings in the air from 1200rpm to 2400rpm with no effect noted.
I could really use some help, as the plane is useless without the ability to communicate.