Go Back  PPRuNe Forums > Aircrew Forums > Biz Jets, Ag Flying, GA etc.
Reload this Page >

Intercom background ’hiss’.

Wikiposts
Search
Biz Jets, Ag Flying, GA etc. The place for discussion of issues related to corporate, Ag and GA aviation. If you're a professional pilot and don't fly for the airlines then try here.

Intercom background ’hiss’.

Thread Tools
 
Search this Thread
 
Old 25th Aug 2014, 22:18
  #1 (permalink)  
Thread Starter
 
Join Date: Feb 2006
Location: Denmark
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Intercom background ’hiss’.

Hi guys,

I supposedly fly a very modern and high tech Falcon 7X but they forgot to install a squelsh function on the intercom...
The mics pick up the background hiss from the noisy cockpit and transmits via intercom. This is ONLY an intercom issue!
On my old Citation this was easily solved with the squelsh knop but not that lucky with the 7X. I’ve tried various headsets and asked my captains to try different headsets but it makes no difference. The ANR headsets won’t make any difference either due to the noise coming from intercom.

Is it possible to get a headset with squelsh adjustment or an ‘external squelsh box’ to connect between sockets and my headset?

Thanks!

Studsgaard
Studsgaard is offline  
Old 26th Aug 2014, 04:20
  #2 (permalink)  
 
Join Date: Jan 2014
Location: glendale
Posts: 819
Likes: 0
Received 0 Likes on 0 Posts
is it voice activated? a VOX?

there might be an adjustment an avionics technician could make, you should really check with the avionics tech I think.
glendalegoon is offline  
Old 26th Aug 2014, 07:32
  #3 (permalink)  
 
Join Date: Jan 2004
Location: Far away from LA
Posts: 1,032
Likes: 0
Received 0 Likes on 0 Posts
What brand / model of headset are you using ?
CL300 is offline  
Old 27th Aug 2014, 19:36
  #4 (permalink)  
Thread Starter
 
Join Date: Feb 2006
Location: Denmark
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
It is not VOX.
My headset is Sennheiser HME45 KE.
Studsgaard is offline  
Old 27th Aug 2014, 21:56
  #5 (permalink)  
 
Join Date: Oct 2004
Location: South of England
Posts: 18
Likes: 0
Received 0 Likes on 0 Posts
Feel your pain

I have the same issue with the Saab 2000 but nobody else seems to notice or care much.
I also tried a noise-cancelling headset but it only served to isolate the white noise, making it seemingly worse.
jetsun is offline  
Old 27th Aug 2014, 22:19
  #6 (permalink)  
 
Join Date: May 2006
Location: Infinity and Beyond
Posts: 82
Likes: 0
Received 0 Likes on 0 Posts
Hi Studsgaard,

Try and get hold of a Telex Airman 750 or 850 headset, they have a microphone attenuation potentiometer in the earpiece adjacent to the microphone boom, plug it in to your aircraft and tweak the headset potentiometer until the point where the hiss is 'squelched'.

Just also check that you dont have a headset in the jumpseat and the mic on hotmic setting, ive seen that causing the same problem as you describe before as well.

There are adjustments that can be done in audio control panels / audio amplifiers too to help eradicate your problem.

Good luck.
AEUENG is offline  
Old 28th Aug 2014, 07:48
  #7 (permalink)  
 
Join Date: Jan 2011
Location: In an ever changing place
Posts: 1,039
Likes: 0
Received 0 Likes on 0 Posts
The telex 850 works well in this situation.
Above The Clouds is offline  
Old 28th Aug 2014, 17:09
  #8 (permalink)  
 
Join Date: Jan 2004
Location: Far away from LA
Posts: 1,032
Likes: 0
Received 0 Likes on 0 Posts
The Sennheiser is on the list of approved headsets ?
CL300 is offline  
Old 28th Aug 2014, 20:28
  #9 (permalink)  
 
Join Date: Nov 1999
Location: Asia
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Check that the f/a's headset isn't the issue......when you do an oxy test on the crew masks it turns all three crew stations to speaker......if the f/a's headset is near the speaker.......

I fly a 7X and have had no problems. We all use Bose ANR headsets. Failing that, in the cruise, release the "Backup" button on the MKB.
Arkwright is offline  
Old 29th Aug 2014, 06:08
  #10 (permalink)  
Thread Starter
 
Join Date: Feb 2006
Location: Denmark
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Thanks for your input guys.
Sennheiser is approved.
No headset/mic in audio 3.
Will the Telex solution work if only I use it my side and the capt. uses something else? I guess not since the noise comes from his mic and hence needs to filtered out on his side?
Studsgaard is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.