VHF - interference/static on ch 16

All you do really is turn off everything and see if the problem goes away. Interference can cause interesting issues sometimes. For instance we have Icom Walkie talkies and when you put one of them down on the helm on the left side of the helm, it starts getting interference. Move it to right side and it’s fine …

Audio systems often have a constant power source to maintain presets and are not switched by the same breaker that would de-power the main unit. It would be best to disconnect the audio equipment completely with a hopefully convenient main plug on the equipment.

I don't see a lot of shielding and energy capturing in today's personal audio equipment.
I don't see much shielding in Icom's (or anybody's) marine equipment either.

My newer cell phone shakes the display on my deck computer.

One little noisy tank oscillator, leaking PLL component, cold solder joint near a crystal or just a bad degaussing cap can create enough noise to compete with a full symphony orchestra (all out of tune).
Then, you have to remember, it was manufactured to a budget (cost reduced every design and component).

It is amazing that we don't have more problems on board out boats.
When I think about this, I want to tighten down my foil cap some times.

So, Some noise from the clock or CMOS tank in a radio, does not surprise me.
Isolation, relocation may be the cheapest path.
Building your own Faraday cage sometimes works. But the I/O wires act like aerials and may still bring the noise in.

Good luck,
keep us up on your escapades, sanity and what you find.

I am reminded of an issue we have;
If I leave the 12V charger on, while the gen-set alternator is charging the same batteries (ACR), I get a buz on my Icom 502.
Funny, Not the Simrad RS35.
BUT Wait, I get a buz on the RS35 when the 24v inverter is running.
F M

For some reason I think Ch 16 may be more susceptible to interference. I replaced an older ICOM VHF with a new Standard Horizon Quantum GX 6000 that worked fine. A few months later I replaced my older Furuno electronics suite with a new Furuno TZT3 setup and immediately experienced similar interference issues only on Ch 16. There were times when the channel was unusable even if fully squelched. After 2 radio replacements under warranty (which did not fix the problem), an upgraded antenna, better shielded cable, and a few ferules we got it under control, but there are still times where I need to up the squelch more than should be necessary to use 16.

I have a stereo component that emits a continuous tone on VHV 13. Took me a while to power down individual electrical devices until I found the culprit.

The antenna/coax is easy to unplug and experiment with.
I'm split on this. It should not be a part of the symptom, but ship happens.

How old is that VHF? Could have some dried-up degaussing caps allowing noise in.

One thought, with all powered on, rotate the Fusion box on 3 axis. Does the noise from the VHF change?

Drag a small 12v battery up there. Try your radio on the stand alone battery, then the Fusion amp.

Finally, ground studs on both units? Strap them together.

If none of the above shows any changes, I'll bring down my O-Scope and hunt up an EMI field meter.
Kiss that hooch under your cabinet good-by as I try to save the last of my red/wild hairs from turning grey..
Wait, I'll just mail these down to you. You don't have a hair problem.

You could try putting a ferrite bead (choke) on the Fusion power cable. I put them on everything just in case. You could call DX Engineering or Ham Radio Outlet and tell them what you want to do and they can sell you what you need.

Forgot about this. I have a bag of them around here somewhere.

I have a crazy suggestion based on a past experience. Do you have extra coax coiled up? I had an issue once when I had about 20 extra feet coiled up and it seemed to cause issues. I cut it down and put a new PL259 on and problems went away. I'm sure my original PL259 was ok. I'm still not sure if the coiled-up coax was the culprit or a bad piece of coax I eliminated but I have read that coax that is coiled up in a less than 12" spool can cause a problem.

Wow, this could be an interesting thought. Coiled up coax looking for some EMI like a dish.
From the early 80's, EIA cables should never be coiled up together to reduce cross/talk and data errors.
On Mux input boards, we learned in the field the better operation was any slack in the serial I/O, was of different lengths and coil up differently.
Remember then, 9600 baud was high tech....

Have just completed install of an ICOM IC-M330G.
Previous ICOM M-45 was 25 years old and squelch apparently was shot.
Am hoping the M-330G doesn’t develop any of the aforementioned “gremlins” on any channel(s) especially 16. Am going to monitor this thread due to the product manufacturer being in common with my new unit.
Cheers all.

Been awhile so I suspect you took care of your issue. If not; you can pick up a small antenna adaptor for your hand held to hook it to the ships antenna to narrow things down.

If something is emitting RF, it will affect all receivers on the frequency(ies) involved, so I’d expect the handheld to be affected as well. The further from the source of the noise, the easier it is to squelch it away.