RADIO NOISE

[Bruno]

Hello everyone
              Today i installed the EMI Kit ( Thank you Dynon ) I just received in an attempt to reduce the radio noise I'm getting.

When the Skyview is booting up it is worse (to be expected I guess) but even with the filters installed I still get quite a bit of noise...

Anything I can do to minimize the noise (install ferrets maybe )??

Thanks for any suggestion you may have

Bruno (aka RV-4)

 

[preid]

Been there and done that. Nothing you can do when it boots up, was actually advised that is was normal. Quiet after it is booted up so I have lived with it.
Now the EGT spikes when I press the transmit button has been hard however. I am climbing and the egts/chts are high. the initial contact with ATC causes the spikes to cause all sorts of alarms. I doubt they are related but there is something about the noise and sensitivities.

 

[dynonsupport]

Been there and done that. Nothing you can do when it boots up, was actually advised that is was normal. Quiet after it is booted up so I have lived with it.
Now the EGT spikes when I press the transmit button has been hard however. I am climbing and the egts/chts are high. the initial contact with ATC causes the spikes to cause all sorts of alarms. I doubt they are related but there is something about the noise and sensitivities.

We have a likely fix for the "EGT spikes" issue in an updated SV-EMS-220. Unfortunately, that updated version won't be in production until approximately mid-September. If you get in touch with Tech Support in September when they're available we can arrange for a replacement unit for this issue.

 

[Bruno]

Hello Support
          I flew the aircraft today for the first time since updating my Skyview with the new ''Alarm/warning''  possibilities ( 3.3.2 ) and when the Skyview boots up, I can hear ''Dynon Skyview '' but that's it..


Aren't we suppose to hear other warnings for example when reaching our selected altitude or something??

Where can I get the full list of available warnings?

The radio noise level was manageable with the intercom set to ''isolate'' and with the other aircraft noises...Iwill check it again tomorrow with the intercom set to normal and see what I get..


Thanks

Bruno

 

[mmarien]

Check in the settings SETUP MENU > SYSTEM SETUP > AUDIO SETUP to see a list of audio messages that you can turn on or off. Perhaps your volume is too low (setting on same page). I get leaving altitude, auto pilot engaged/disengaged, nice landing, traffic unavailable and others. You should at least get low oil when you shut down if your avionics are still on.

 

[Bruno]

Hello mmarien

Just flew the a/c today and didn't get any warning at all and I did check the set up page so what's the problem...?

I will check something with the intercom tomorrow and recheck the setting to see what I get..

I will report the results back..

 

[mmarien]

Hmmm. If you're getting the Dynon Skyview at startup it's working. My intercomm mutes other channels when there is something coming through the COM. If that's happening the warnings would be muted.

The other possibility is the isolate doesn't allow anything other then the COM. What do you have for avionics equipment?

 

[shenweas]

I get ..., nice landing...

My landings must be no good :'( I hever heard her say that

 

[preid]

We have a likely fix for the "EGT spikes" issue in an updated SV-EMS-220. Unfortunately, that updated version won't be in production until approximately mid-September. If you get in touch with Tech Support in September when they're available we can arrange for a replacement unit for this issue.[/quote]


That is great news! I'll make a note to followup in September I will certainly benefit from this.
You guys remain a first rate company, call it as it is and replace it when it's needed. Awesome!

 

[mmarien]

My landings must be no good  :'( I hever heard her say that 

Keep working at it. ;D

 

[Bruno]

Hi MMarien
           I think the intercom might be the culprit.If I set it to ICS, I get the warnings but the radio noise is unbearable so I have to set it to isolate.

I really don't know where all that noise is coming from.

Avionics & Electronics wise I've got:

SL-30
GTX-327
KLN-35A
Avmap IV GPS
JPI-700
FlightCom Intercom
AP-60 Audio Mixer
Monroy Traffic Detector
EI-Electronic RPM
FL-5A Fuel computer
Dual LSE Ignition

All that require it are using RG-400 for coax cable.

Any idea what might cause all that noise.

Thanks

Bruno

 

[johnsteichen]

I have found that the radio noise relates to screen brightness. The circuitry that controls the screen brightness must use some sort of chopping circuitry that becomes audible in partial brightness settings. Noticeable on boot up. Full bright screen = no noise in my installation, after boot up

 

[mmarien]

Bruno

When you switch to isolate, input from the crew and the music/aux inputs would be cut off, but anything coming from the radio (AP-60 Audio Mixer) would still come through to the pilot. But you're saying Skyview audio is not coming through? Is Skyview connected to the AP-60 Audio Mixer or the FlightCom?

 

[preid]

I have found that the radio noise relates to screen brightness. The circuitry that controls the screen brightness must use some sort of chopping circuitry that becomes audible in partial brightness settings. Noticeable on boot up. Full bright screen = no noise in my installation, after boot up

There is another place for research- figure out why the screen causes the noise at boot-up, I tried everything here as well, filters etc.. I, at one point, thought the noise at boot-up was related to the EMS spikes when the PTT is depressed, aka a EMI or RFI related. I also had headset issues with noise. I still get minor noise issues but I don't think it's related to the Dynon, we know the EMS 220 is being upgraded, that should hopefully resolve my "check EGT" alarms on takeoff that I always get when contacting APP/DEP, so all that is remaining is why the noise when the screen boots up?
Otherwise I get Dynon alerts. I have the volume up at 85%, below that I can't hear her telling me anything.

 

[Bruno]

Hi mmarien

           ''Is Skyview connected to the AP-60 Audio Mixer or the FlightCom?''

It is connected thru the Audio Mixer but like I said I did get the warnings with the Intercom set to ICS but not in Isolate which is normal I believe.

Now what I need to do is fix the noise issue when in ICS mode so I can hear everything..
Will installing ferrets help in reducing the noise if so where should I install them??

Thanks you for your help,it's appreciated..

Bruno

 

[mmarien]

Bruno

Not sure about the ferrets. I'm not a radio tech.

I was thinking that is everything is connected through the AP-60 Audio Mixer then even if you switch to isolate, all that stuff should still come through to the pilot. I think that all isolate does on the FlightCom is isolate the pilot from the copilot and passengers and any aux inputs within the intercom.

That brings up the possibility that if your noise is only when you have it on ICS then the noise could be coming from the intercom part of the FlightCom, the other headset jacks or the aux channels on the intercom. Is it possible one the copilot jacks is shorting out or has a bad connection?

I'm leaving on a cross country trip early tomorrow for a couple of weeks. I probably won't be able to check in on the forum during that time. I wish you luck with sorting it out though.

 

[jakej]

Bruno

It's now time for you to get a 'professional' to assist.  I'm feeling that with all the questions & answers so far that the issues you have will not be easily sorted out on a forum.

If I lived over there I'd come over & help out but that's not possible & fixing the gremlins you have would be too long a forum process without actually seeing your wiring.

This is not meant or intended to be personally critical of you, no way    but, as the song goes ' you gotta know when to hold them & know when to fold them' - just my 2 cents 

Jake J

 

[dynonsupport]

Just fyi, there are two ways that you can experience apparent noise in audio. One is if there's RF interference from a radio device. To test for that, turn off radios. If it goes away, it's likely RF. The other is via grounding issues, which is what the above sounds like it is (related to the screen dimming). Filters and other RF-oriented solutions won't work on grounding issues. Only improving the ground will.

 

[Bruno]

Hello Support

            I'm gonna fly the aircraft tomorrow and try to isolate the noise source as you said by turning off equipment and see if I get anything..

I also wanted to check for a bad ground in the system and if it doesn't work, I'll go toward Jake's solution and see someone that knows more about these issues than I do ( That part should be easy..

I will report back if it works

Thanks

Bruno