Welcome, Guest. Please login or register.
Did you miss your activation email?
December 19, 2014, 11:31:59 PM
Home Help Login Register      
News: NEW Follow LiveATC updates on Twitter and Facebook


+  LiveATC Discussion Forums
|-+  Air Traffic Monitoring
| |-+  Listener Forum (Moderators: dave, RonR)
| | |-+  Is this really live?
« previous next »
Pages: 1 [2] Go Down Print
Author Topic: Is this really live?  (Read 14297 times)
PHL Approach
Hero Member
*****
Offline Offline

Posts: 743



« Reply #15 on: May 04, 2005, 07:33:17 AM »

Quote from: dave
Quote from: marcoleon
I believe the original poster got the notion of a delay from the live flight tracking in applications such as Flight Explorer. I have a subscription to their Personal Edition and there's what seems like a 5-minute delay between what I see and what I hear on LiveATC. I do remember reading that a delay in flight data was implemented for security reasons.

Marco Leon


This is true in the case of radar data (and I believe it is 10 minutes).  I know of no such restriction on radio communications.  The only delay we have here is about 5-10 seconds (combined encoder and feed transmission/buffering latency).

-dave


You know, I'm starting to doubt this whole thing about there being a delay on tracking programs to 10 minutes due to security. I have used FBOweb and had it as low as 3 minutes. So Im starting to think there are other reasons, other than security as to why it's delayed.
Logged
marcoleon
Jr. Member
**
Offline Offline

Posts: 60



« Reply #16 on: May 09, 2005, 01:18:53 PM »

"Why does it appear that there is a delay on Personal Edition compared to what I see overhead or hear on an aircraft radio?
The Federal Aviation Administration has recently imposed a five minute delay on all aircraft position data for most non-airline use. This is a mandatory delay imposed by the FAA on all vendors of flight tracking services to the general public. If you are a commercial user in the aviation industry, you may qualify for non-delayed position data, which is available on our Professional Edition product. Please contact the Sales Department for more information on Flight Explorer Professional Edition, and to find out more about the FAA requirements to qualify for non-delayed position data. "

There you have it...

Marco
Logged
nfredrich
Full Member
***
Offline Offline

Posts: 167



« Reply #17 on: May 10, 2005, 12:27:24 PM »

yeah.... thats for flight tracking software... this is not flight tracking software. this is an MP3 encoder that encodes the actual scanner audio. That scanner audio is realtime. there is no way that I know of where the FAA can put a delay on live ATC transmitions, I doubt it exists.

Therefore on average you are getting a 20-50sec delay due to encoding, sending, buffering, decoding and your specific internet connection speed.
Logged

Nick Fredrich
PHL Approach
Hero Member
*****
Offline Offline

Posts: 743



« Reply #18 on: May 10, 2005, 03:15:59 PM »

Quote from: nfredrich
yeah.... thats for flight tracking software... this is not flight tracking software. this is an MP3 encoder that encodes the actual scanner audio. That scanner audio is realtime. there is no way that I know of where the FAA can put a delay on live ATC transmitions, I doubt it exists.

Therefore on average you are getting a 20-50sec delay due to encoding, sending, buffering, decoding and your specific internet connection speed.


The topic got changed to flight tracking.
Logged
nfredrich
Full Member
***
Offline Offline

Posts: 167



« Reply #19 on: May 10, 2005, 04:02:23 PM »

Whoops...   embarassed
Logged

Nick Fredrich
Jason
Hero Member
*****
Offline Offline

Posts: 1260


CFI/CFII


« Reply #20 on: May 10, 2005, 04:12:38 PM »

Quote from: PHL_Approach
Quote from: dave
Quote from: marcoleon
I believe the original poster got the notion of a delay from the live flight tracking in applications such as Flight Explorer. I have a subscription to their Personal Edition and there's what seems like a 5-minute delay between what I see and what I hear on LiveATC. I do remember reading that a delay in flight data was implemented for security reasons.

Marco Leon


This is true in the case of radar data (and I believe it is 10 minutes).  I know of no such restriction on radio communications.  The only delay we have here is about 5-10 seconds (combined encoder and feed transmission/buffering latency).

-dave


You know, I'm starting to doubt this whole thing about there being a delay on tracking programs to 10 minutes due to security. I have used FBOweb and had it as low as 3 minutes. So Im starting to think there are other reasons, other than security as to why it's delayed.


What I personally believe is software.  If they do not have the software capabilities to update data fast, a delay is probably put in place.

One possibility...

Hey Nick, its HN  Cool
Logged
Pages: 1 [2] Go Up Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2011, Simple Machines Valid XHTML 1.0! Valid CSS!