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Posted

I have dual Bendix KX155’s installed in my MSE, KMA24H audio panel. I’ve noticed on my lower unit (COM 2) when the radio gets warm, after having been on for awhile, when I go to transmit, as soon as I key the mic there is a loud “pop” heard in the headsets. I am able to transmit and receive normally. COM 1 does not do this. 

It’s rather uncomfortable on the ear drums (it is LOUD!) so I’d like to get it fixed. Anyone have any suggestions? I will try swapping the radios around and see if the issue follows. If it remains on COM 2 it may be within the audio panel. If anyone has any other suggestions, let me know and I’ll try it out. 
 

I hope my explanation is good enough, I can hear myself transmit just fine, it’s just the loud “pop” that lasts a fraction of a second as soon as the PTT is depressed. 

Posted
20 hours ago, Slick Nick said:

I can hear myself transmit just fine,

I’m not sure if ‘hearing’ yourself transmitting in the headset (sidetone) means you’re actually sending out a signal through the antenna.

I’d verify that it’s transmitting with a radio check with someone.

Posted
1 hour ago, 47U said:

I’m not sure if ‘hearing’ yourself transmitting in the headset (sidetone) means you’re actually sending out a signal through the antenna.

I’d verify that it’s transmitting with a radio check with someone.

I have. Come through loud and clear. 
 

Went flying today, radio was fine for a couple of hours, until I left the plane parked in the sun, came back, and the popping returned. Seems to be temperature related. Maybe one or more of the caps or transistors inside are going bad. 

  • Like 1
Posted

Did you try pulling the radio out of the tray and reinstalling? 
Usually that’s our first go to if we have radio trouble, it may be just a bad connection. It’s worth the effort and it has resolved radio issues for us in the past.

  • Like 2
Posted
23 minutes ago, tcal780 said:

+1 for kx-155.com. Awesome to work with. If you can wait 6-8 weeks, I recommend them. They did a great job on my 165.

Their website says they are not taking on any more work until their backlog of over 50 units are finished.  Busy place like everyone else.

Posted

Check around. There are probably lots of used ones for sale with all the panel upgrades. May be cheaper to buy a used one. 

Posted
36 minutes ago, PT20J said:

Check around. There are probably lots of used ones for sale with all the panel upgrades. May be cheaper to buy a used one. 

I looked this up recently, and found one in Nigeria.  Good thing shipping was free.

  • Haha 3
Posted

Went up today on a 3 hour flight. The radio wouldn’t pop. I’m happy that it worked well, but part of me thinks it was just a fluke. I’ll see if I can consistently replicate the issue. 

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