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Dave's RV-7A Builder's Log
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Date:  1-7-2017
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Audio panel troubleshooting

With a newly arrived shipment from B&C, the first step today was to install the BNC connectors for the COM 2 radio and test the reception. Once installed, I powered up the avionics and was immediately greeted with the same stuck mic condition I had been battling the last few weeks...this time with the audio panel still off. Although I was frustrated, there really wasn’t anything else to do but forge ahead, so I decided to install the co-pilot’s (suspect side) com and mic jacks into the sub panel and test the reception from that side with my headset. That’s when I found it.

In a previous session I had added terminals to the mic and headphone jacks to ensure the short wasn’t there, but today I looked closely at the labels (label your wires!) and it said “Aux Audio Input” on what I had thought was the mic wire bundle. But if that wasn’t the mic wire bundle, where was it? As it turns out, when arranging the initial wire installation, I had simply zip tied the pilot and co-pilot audio bundles to the main bundle in order to keep them out of the way. After installing the pilot’s side jacks (mic and headphone wires only on the left side), I reached for the only two wires I saw on the co-pilot’s side…which happens to have the extra audio input wires. The mic wires, nicely stripped for terminal installation by Steinair, were lying along the lower longeron with the bare ends touching the firewall…shorting the push to talk switch intermittently.

After fixing that little issue, I tested everything and it worked perfectly. I then added a BNC "L" connector to the GDL 39 to solve a challenge with the RG 400 as it crossed over the essential bus diode and would have caused some chafing issues. The new connector changed the angle of the cable and everything clears now.
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