Some thoughts
I cut and pasted all your inputs:
Trying to figure out why both of my coms are only transmitting tops 5 miles and very scratchy...I can understand one com doing that due to a bad antenna ground.. But I have two antennas one for each com and both are exactly the same poor range and sound quality..
It's only 5 miles while flying. What has me confused is why both radios? I've seen one out of two radios or antennas do this but not both radios with the same issue.. I have Bose A20 headsets..I really hope there not bad but I will try a different pair. You never know, anything can break..
Com 1 Icom IC-A200
Com 2 Narco 810
Intercom PSEngineering PMA4000
I'm not sure how to turn the intercom off and by pass to one radio..
Shane
RV-8
N20EA
__________________
Shane Wollert
RV-8 Best RV I've Flown..Love it
RV-7A
RV-3
RV-6
1 - You signature information suggests a lot of operational RV and communication system experience.
2 - The ability to communicate 5 miles verifies that both systems function properly and that it is a performance problem.
2 - How did you conduct the test? Who was the receiver, was the source reliable and were the results similar in communication with another site.
3 -
Exact same performance problem strongly indicates a single point failure.
4 - Did the problem just arise on an airplane/system the previously was working as you expected or is this a new system in debug?
5 - The problem could be audio frequency prior to modulation since the RF section of the two different manufacturer's radios are completely isolated from the source within each radio to their separate antennas.
6 - How is the reception on the two radios? This is significant since all of the connections between the antennas and the radios are used for reception as well as transmission.
7 - My guess would be in the audio part of the system related to transmission - mic switch, mic jack, audio panel or grounding.
Bob Axsom