Radio static

[fastfred]

Anyone have and input on this problem. When I key the mic it makes a loud static . Very uncomfortable. So far I have checked the settings adjusted the squelch . It started one day when talking to the tower with a Helicopter running near by . I keyed the mic and got blasted with static and helicopter blades. I tried to adjust it out and lost the tower for few minutes. The controller was not happy with me..

[Esser]

What comm? How far are your coax cables from other cables?

[Dave S]

FastFred,

If you have a new or different headset, or new or different radio, you might need to adjust the mic gain (first) or the sidetone on the radio itself.

When you speak of picking up helicopter noise in the transmission - that makes me think a look at the mic gain is a good place to start - might be set a little high.

Information on doing this is a bit skimpy in most radio manuals, however the David Clark headsets have some instructions in their headset manuals.

If you don't have a new or different headset or radio - might need to start somewhere else.

IMHO....Radio=Voodoo

[fastfred]

It is a Garmin SL 30 and Sl 40. I did just install the dynon ADS B in unit which has coax running to the Antenna. He just ran it next to the existing harness.

[DesertFox4]

Check for good grounds on radio and push to talk switch also.

[rv9ralph]

If the problem manifested after the ADS-B install, I would check anything new from that work. Suggestions such as the routing of new antenna coax (RF bleed over).

Ralph

[fastfred]

I will try that next. I wouldn't think it would be a ground problem because the radio is 8 yeas old. But it did not do it right away after the adsb in was installed?

[PaulSS]

I'd almost wager a few ales that the proximity of the two coax cables is causing this problem. Route the ADSB coax as far as possible from the radio coax and I reckon you'll be fine. If that doesn't solve it then let us know where your radio antenna is relative to the newly-installed ADSB antenna.

[P Morel]

Just a thought and sharing my radio gremlin experiences.

FWIW

Have you recently installed any new electronic add ons?
USB plugs can sometimes be the culprit.
LED lighting can also interfere.

Of course check your solder connections on you plugs.

[dcsfoto]

I just finished chasing static found that the Stock EMU ( I have the 912iS) needs a good ground and it gets that from the panel my panel was not grounded

working on that now


David Kelm
7SS Garmin Touch
912iS Big Bore

[efwd]

David, are you saying the actual instrument panel needs grounding?

[jiott]

Yes, I had to ground my Dynon Skyview panel.

[fastfred]

Was your static all the time or just when you press the mic? I will check the grounds though when I get a warm day

[jiott]

I never had any static, maybe because I grounded the panel as instructed from the get-go.

[PaulSS]

Jim,

I think you might be confusing people with what 'panel' you're talking about. I think you're talking about your Dynon EFIS 'panel' but others are talking about the instrument panel itself i.e. the metal thing with holes drilled in it. It might be useful if you clarified which 'panel' you are referring to.

[jiott]

You are right Paul, I need to clarify: My Skyview EFIS panel is grounded to my instrument panel, so therefore I had to ground my instrument panel to my common ground buss that grounds everything else. Hope that's clear.

[PaulSS]

It is to me :D

In the RV8 that I have been involved with (helping would probably be stretching the truth) the Skyview was grounded directly to the common ground. In fact, every ground ran back to the common ground and then to the battery. This, in theory, reduces the chance of ground loops whereas grounding first to something like the instrument panel and then the common ground creates another pathway through which the stray wigglies can wander and cause trouble. Of course, it doesn't happen all the time (as yours proves) but I think it is becoming more recognised that the airframe, panel etc are not the best ways to route ground wires. I think if an aircraft is very basic then it doesn't matter so much but with the sensitive EFIS, radio, EMS kit that is around nowadays the problem is more likely to rear its head.

[jiott]

I guess I need some more clarification of my situation. I agree 100% with you Paul, so my EFIS ground wire goes to a terminal/stud on my instrument panel, and then from this same stud to my common ground buss. So its like one continuous ground wire with no paths thru the frame or the panel itself.

[PaulSS]

Even better :D

Yes, that sounds like a good setup because it's effectively an instrument ground bus that then connects to the common ground bus. That's a good way to keep the nasties away and much better than using the instrument panel itself via the airframe. Well, that's the thinking of people that know about these things. I just read what they've written ;)