AJ85WA
Well Known Member
Hi Guys
I need some help please.
Radio is MGL V6 with delta pop antenna.
The intercom and receiving of transmissions works great. But when I press the PTT switch i can hear anything touching the fuselage, like say tapping my fingers on the fuselage, or locking the canopy etc.
I have:
1. confirmed with meter that all headset, mics, music input jacks are isolated from the air frame. (all wires are shielded)
2. ALL grounds(mic's, headsets,PTT,music input etc) connect to the radio and then a single ground goes from the radio to the firewall ground
3. I have installed a noise filter from the alternator P-lead to the engine ground, but don't think it is related because it is not that kind of sound.
4. When the engine is running the noise increases with RPM(only with PTT held down), I have switched off the alternator, swapped between L and R mag and all other equipment is turned off?
5. I think it only happens when pressing PTT to freq above 117.0? I will have to confirm this.
Any help or input would be greatly appreciated. Im kinda stuck on this issue. I have not tested the antenna with SWL meter, could this be the problem?
Thanks in advance
AJ
I need some help please.
Radio is MGL V6 with delta pop antenna.
The intercom and receiving of transmissions works great. But when I press the PTT switch i can hear anything touching the fuselage, like say tapping my fingers on the fuselage, or locking the canopy etc.
I have:
1. confirmed with meter that all headset, mics, music input jacks are isolated from the air frame. (all wires are shielded)
2. ALL grounds(mic's, headsets,PTT,music input etc) connect to the radio and then a single ground goes from the radio to the firewall ground
3. I have installed a noise filter from the alternator P-lead to the engine ground, but don't think it is related because it is not that kind of sound.
4. When the engine is running the noise increases with RPM(only with PTT held down), I have switched off the alternator, swapped between L and R mag and all other equipment is turned off?
5. I think it only happens when pressing PTT to freq above 117.0? I will have to confirm this.
Any help or input would be greatly appreciated. Im kinda stuck on this issue. I have not tested the antenna with SWL meter, could this be the problem?
Thanks in advance
AJ