KX155 radio noise on 1 freq

[Mooneymite]

Years ago, I  found that 120.9 was garbled on both my comm radios.  When I complained to a tron-tech, he opened the fuselage access and completely removed my ELT.  That cleared up the frequency.  It didn't make sense to me since the ELT wasn't transmitting.  The tron said it was a frequency harmonic caused by the proximity of the ELT antenna to the comm antennae (or something like that).   He installed a "gizmo" (choke?) on the ELT's antenna connector and the problem never recurred.

Personally, I think it was fixed by a secret Wiccan incantation.  That makes more sense than an "antennae harmonic".  I only offer this story in case you know that Wiccan incantation.  

[A64Pilot]

On 7/16/2020 at 7:10 AM, takair said:

Do you have portable GPS or USB charger?  Start with those.  Many of the USB chargers are known to cause intermittent noise.

Many LEDs do too, it’s their power supply

[A64Pilot]

RF chokes can help, wrap usually the power supply wire around the choke a couple of times and snap it shut, cheap and easily removable, but you have to have a few inches extra wire. 

https://www.amazon.com/rf-choke/s?k=rf+choke

[Cory_40]

On 8/7/2020 at 11:27 PM, LucasC said:

Got the radio back from mikes avionics out of AZ. He couldn't pin point a problem necessarily but he realigned the radio to specs and all is well now. I recommend for older king and narco problems. Clear as a bell now.  

How much did that cost to have it realigned?

I have the same probable. Mine is a range of frequencies between 121.9 and 123.1 and again at 132.0 to 133.0.   Clear elsewhere.

Just constant static unless transmitting or receiving. 

[MikeOH]

31 minutes ago, Cory_40 said:

How much did that cost to have it realigned?

I have the same probable. Mine is a range of frequencies between 121.9 and 123.1 and again at 132.0 to 133.0.   Clear elsewhere.

Just constant static unless transmitting or receiving. 

@Cory_40

Just want to point out this thread is 4 years old, and @LucasC hasn't visited since July 2021.

You might try contacting https://www.kx-155.com/

 

[PT20J]

Bevan repairs these.