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Thames 'DARLEK' Radar

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Thames 'DARLEK' Radar

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Old 17th Dec 2007, 07:42
  #21 (permalink)  
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Whether I refered to ATC prople as officers, operators or contollers, as I have heard them call themselves, was not intended to offend. I just wanted to point out the poor audio quality , probably caused by a lack of bandwidth in the data link between themselves and the transmitter. The People on Thames radar do a great job! and dare I admit to being a PPL after all the negiative comments already posted.
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Old 17th Dec 2007, 09:39
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The term Operator

As a current, license holding ATCO, I have no problem if a member of the public uses the word operator - anyone with a dictionary or a grasp of basic English will know that it is a valid noun for our profession, if not the one that we use ourselves.

Mike, one of the reasons mooted as possibly being responsible for the 'tinny' sounding R/T (which is evident on most of the TC frequencies) is the fact that it is all digitised and therefore somewhere in the process, quality is affected.
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Old 17th Dec 2007, 09:44
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Originally Posted by MikeStanton
I just wanted to point out the poor audio quality , probably caused by a lack of bandwidth in the data link between themselves and the transmitter.
Rubbish, do you really think that NATS would use a voice comms system which didn't support the task? Both you and anotherthing need to understand what 'digital' means and how radio data transmission (indeed any digital data) works. dazdaz provides the more likely and probable explanation.

BD
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Old 17th Dec 2007, 10:26
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<<Rubbish, do you really think that NATS would use a voice comms system which didn't support the task?>>

Perhaps those on watch the day after TC moved to the seaside might have other views on the subject!!
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Old 17th Dec 2007, 10:30
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BDiONU

DAZDAZ wrote:

It is well know in areas of London ie. Buck Palace/Downing St/MI5 building on the Thames that certain radio frequencies are blocked/distorted for security reasons of which I'm sure you might be aware of the reason for. Next time outside Buck Palace see does your mobile work?
and then you added:

dazdaz provides the more likely and probable explanation.

I appreciate that you know a more than bit about the VCCS and it's associated bits and pieces however I have a couple of points there -

firstly my post was heavily weighted by words which indicated that what I was saying was not the definitive answer, but I can guarantee it is one that is, as I said, being mooted in the OPs room. The veracity of it or otherwise is not within my remit.
This is a rumours and news network so I think it has a valid place here - especially as no one has come across with a definitive answer!

Secondly, are you honestly saying that Dazdaz's explanation is a likely answer? If so, why are frequencies that have transmitters nowhere near the City, and why are aircraft that are mid channel or near Daventry (to name just a few of the geographically distant areas) reporting the same phenomena? It is not by any means exclusively Thames radar that is affected.

Further, if dazdaz's explanation is deemed to be correct, why is it still happening? Playing about with the reception on someones mobile is one thing, however employing measures that have a detrimental effect on the frequencies used by a very busy ATC unit is a whole different ball game.

Finally, again if dazdaz's explanation is anywhere near true, why has it just started happening now that we have moved to Swanwick and are using a brand new piece of kit? It is not something that we suffered when working at West Drayton.

No one is saying that
Rubbish, do you really think that NATS would use a voice comms system which didn't support the task?
What many pilots and ATCOs are reporting is that the sound quality is not perfect or ideal. The fact of the matter is that it is suitable to carry out the task as required, but since when has 'good enough' been good enough?

And finally(honestly this time!) to quote you again

do you really think that NATS would use a voice comms system which didn't support the task?
No, I do not, which is the very same reason why I think that they would not allow

certain radio frequencies are blocked/distorted for security reasons
cheers,

Anotherthing (ex mil aviator, with several 'in depth' courses on electronic warfare under my belt)

Last edited by anotherthing; 17th Dec 2007 at 10:41.
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Old 17th Dec 2007, 10:38
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Originally Posted by HEATHROW DIRECTOR
Perhaps those on watch the day after TC moved to the seaside might have other views on the subject!!
And perhaps they no longer do? Personally I was/am impressed with how pragmatic the LTC staff have been. They knew that VCCS would not be perfect on day one and it wasn't but the glitches are being worked

BD
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Old 17th Dec 2007, 10:51
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Originally Posted by anotherthing
I appreciate that you know a more than bit about the VCCS and it's associated bits and pieces
I'm ATC and not an engineering expert but I do know about how 1's and 0's get squirted around on bits of wire.
I can guarantee it is one that is, as I said, being mooted in the OPs room. The veracity of it or otherwise is not within my remit.
There are lots of rumours floating around, the one that made me laugh most was that the board decided not to revert back to West Drayton on the Sunday because of a crash blocking the M3 Of course there are no alternative routes up to London.
Secondly, are you honestly saying that Dazdaz's explanation is a likely answer? If so, why are frequencies that have transmitters nowhere near the City, and why are aircraft that are mid channel or near Daventry (to name just a few of the geographically distant areas) reporting the same phenomena? It is not by any means exclusively Thames radar that is affected.
What I'm saying is that the digital transmission of data does not affect the quality of the product at the other end. How you encode analogue voice to send it by digital and then change it back to analogue at the far end may affect it but the amount of data is really quite small. Voice data is small, hence the ability to have VOIP phone networks (like that at the CTC) whilst also using the network for other data.
There are a lot of factors involved in radio reception (weather anyone?) and it seems obvious to me that if the transmissions sound peculiar in one area but not another which uses the same radio leg then its not the transmitter at fault.
Finally, again if dazdaz's explanation is anywhere near true, why has it just started happening now that we have moved to Swanwick and are using a brand new piece of kit? It is not something that we suffered when working at West Drayton.
You're now using a completely different system which is end to end but I'm cautious about accepting it never happened at WD. There are other factors which need to be looked at for example how are the staff using the new headsets, is the mic close enough to the mouth etc.

BD
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Old 17th Dec 2007, 11:07
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Good to have a civilised exchange of views I think. And healthy.

There are other factors which need to be looked at for example how are the staff using the new headsets, is the mic close enough to the mouth etc.
That would not explain why the 'tinny' sound was experienced from both ends.

Yes there are many factors - however I think that from an ATCO perspective the confidence in the kit is high and getting better everyday; thanks to the sterling work by those in the background.

However, no matter how persuasive an argument anyone can come up with, I stand by the following, which I wrote in my last post

The fact of the matter is that it is suitable to carry out the task as required, but since when has 'good enough' been good enough?
Which was made in answer to your post

do you really think that NATS would use a voice comms system which didn't support the task?
I know that work is continuing on the system, and I am sure that in the long term it will be what we want it to be. As it is now, I still think that overall, it is a hell of an improvement (especially the functionality) on what we used to have
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Old 17th Dec 2007, 11:17
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Originally Posted by anotherthing
Good to have a civilised exchange of views I think. And healthy.
Come on outside, be a man and get your dukes up
Yes there are many factors - however I think that from an ATCO perspective the confidence in the kit is high and getting better everyday; thanks to the sterling work by those in the background.
Took a bit of a dent on that Sunday methinks. The software we tested last week should deploy Weds night for a test and fully on Thursday.

However, no matter how persuasive an argument anyone can come up with, I stand by the following, which I wrote in my last post
My answer would be that you're still at Swanwick and not WD so its obviously 'good enough' to do the task.

I know that work is continuing on the system, and I am sure that in the long term it will be what we want it to be. As it is now, I still think that overall, it is a hell of an improvement (especially the functionality) on what we used to have
Blimey! A couple of years ago the projects understanding was that the system at WD was simply the best thing since sliced bread and couldn't possibly be replicated and improved upon
It will take a little time in order to determine what/where the 'fault' with audio quality is and I'm certain that the project and other engineering staff are very keen on providing perfect audio quality.

BD
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Old 17th Dec 2007, 11:29
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By saying that 'good enough is not good enough', I mean that one should not settle for something that is 'adequate'. Especially when the system in question is capable of so much.

Fortunately making do with 'adequate' is not the mentality of the engineers etc
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Old 17th Dec 2007, 15:35
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BDiONU said:

do you really think that NATS would use a voice comms system which didn't support the task?
I wouldn't go saying that too loudly at some airports.......
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Old 17th Dec 2007, 16:29
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I go into LCY most days and it isn't just Thames that are "Daleks" it goes further out than that - Daventry(?) 130.925 on the way out and the controllers near Clippy on the way in from Scotland.

It doesn't happen on all transmissions, but it never seems to happen at the start of a transmission.
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Old 17th Dec 2007, 18:17
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<<...ATCO perspective the confidence in the kit is high and getting better everyday; thanks to the sterling work by those in the background.>>

Forgive me for saying this, but shouldn't they have had absolute confidence in the equipment from the very start? It's quite ludicrous to say that the confidence of people who are dealing with the lives of thousands of people is "getting better". The question should never have arisen.
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Old 17th Dec 2007, 18:26
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VCCS works and is working well.

There were more than adequate back-up facilities to it on day one and there still are and always will be. In fact we have better back-up/redundancy at Swanwick than we ever had at West Drayton or even back in the halcyon days of operating in our ivory tower at LHR.

There is always a certain amount of mistrust in new equipment. With VCCS I think the rumour mill allowed what issues there were prior to going live to be somewhat blown out of proportion and it perhaps got a rap that wasn't entirely justified.

Whatever, it's here, it works, it's staying.
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Old 18th Dec 2007, 07:00
  #35 (permalink)  
 
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I remember moving from Heathrow Tower to LATCC well.. Having been very emphatically assured of the integrity of the equipment... one morning every other radar display in the ops room failed, leading to certain consternation among the troops and we craned to get a shufty over a colleague's shoulder. Things don't change.....
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Old 18th Dec 2007, 15:19
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I know what a "dalek" is, but what's a DARLEK?
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Old 18th Dec 2007, 15:49
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Beats me; I have no ideaR.
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