markyharris
11-15-2021, 08:31 PM
Hi all,
I've been fighting this issue for a bit now with no resolution. So before I send it to an avionics shop I thought I'd get some expert opinions on what i might try first. :)
I have a SW V6 Digital Com (https://www.michiganavionics.com/product/sw-avionics-v6-vhf-com-radio/P) that is mis-behaving. The audio quality is fine both receiving and transmitting at frequencies below 130 mhz. However, at frequencies above 130 mhz the transmission is scratchy and 'hollow' sounding both to the receiving ATC controller and in my headset. However when ATC transmits to me, it is normal. Only when I transmit does the problem occur, but it happens every time.
Of course, my home airport tower frequency is 134.55, so its an issue I need to solve. Coincidentally, the ground freq is 121.9 and works great! Go figure.
The radio is married to a Rami antenna (https://www.aircraftspruce.com/catalog/avpages/av529_ant.php?clickkey=9801) and I've removed the antenna and cleaned the paint off the mounting plate under the fabric and replaced the hardware to guarantee good grounding. I've read that adding a ground plane might help, but based on my research the Kitfox's frame should be plenty of ground plane.
Any suggestions would be appreciated. - Mark
I've been fighting this issue for a bit now with no resolution. So before I send it to an avionics shop I thought I'd get some expert opinions on what i might try first. :)
I have a SW V6 Digital Com (https://www.michiganavionics.com/product/sw-avionics-v6-vhf-com-radio/P) that is mis-behaving. The audio quality is fine both receiving and transmitting at frequencies below 130 mhz. However, at frequencies above 130 mhz the transmission is scratchy and 'hollow' sounding both to the receiving ATC controller and in my headset. However when ATC transmits to me, it is normal. Only when I transmit does the problem occur, but it happens every time.
Of course, my home airport tower frequency is 134.55, so its an issue I need to solve. Coincidentally, the ground freq is 121.9 and works great! Go figure.
The radio is married to a Rami antenna (https://www.aircraftspruce.com/catalog/avpages/av529_ant.php?clickkey=9801) and I've removed the antenna and cleaned the paint off the mounting plate under the fabric and replaced the hardware to guarantee good grounding. I've read that adding a ground plane might help, but based on my research the Kitfox's frame should be plenty of ground plane.
Any suggestions would be appreciated. - Mark