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Author Topic: What Did I Pickup 280nm Out?  (Read 26169 times)

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Falcon

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Re: What Did I Pickup 280nm Out?
« Reply #15 on: March 14, 2009, 05:47:02 PM »
Hi,

Here is another diagram I built up over a day or so. I did manage to match up the logs for the larger of those two spikes you see. I couldn't find anything on the narrower one. I am still not sure whether to believe there could be reception over 290nm out given my overall reception to the west but the information is in the log. It even extends well past any coverage I normally get to the east.

Regards,
Darryl
« Last Edit: March 15, 2009, 08:44:52 AM by Falcon »
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Johnn

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Re: What Did I Pickup 280nm Out?
« Reply #16 on: March 14, 2009, 07:39:02 PM »
Quote from: Falcon on March 14, 2009, 05:47:02 PM
Hi,

Here is another diagram I built up over a day or so. I did manage to match up the logs for the larger of those two spikes you see. I am couldn't find anything on the narrower one. I am still not sure whether to believe there could be reception over 290nm out given my overall reception to the west but the information is in the log. It even extends well past any coverage I normally get to the east.

Regards,
Darryl

Hi Falcon, Was That Polar Diagram Taken With A Standard Antenna Or External?
Thanks John
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Falcon

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Re: What Did I Pickup 280nm Out?
« Reply #17 on: March 14, 2009, 08:13:52 PM »
Quote from: Johnn on March 14, 2009, 07:39:02 PM
Hi Falcon, Was That Polar Diagram Taken With A Standard Antenna Or External?
Thanks John

Hi John,

It was with the antenna included with Radarbox on the ENE side of my house. I get regular contact between 100nm and 150nm out towards the east. The polar diagram I posted was not complete as it was only over a short period of time. It's usually spikey vs a spikey circle which I see from others living elsewhere where there is flatter terrain. The aircraft are generally coming in on the arrival routes over mountainous terrain which start quite a ways out. I am actually quite impressed with the reception given the hilly and mountainous terrain I live near. I will get drop outs depending on the aircraft altitude and it's location in relation to the local hills or mountains around me. So far today I have logged 286 aircraft at 20:12 UTC, which are mostly large and medium size aircraft. I probably don't get anywhere near what some in the UK or parts of Europe may see but its quite good for around here.

Regards,
Darryl
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EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #18 on: March 14, 2009, 10:45:37 PM »
Picked up today from Derby UK N52.3 W01.5

AE087F 01-0029 GLF5 USAF. Mylog has me picking it up over antarctica?
Previous contact is somewhere over the arctic.

Polar Diagram gif and mylog gif attatched. The spike to the south has happened 4 times in the same place I'll see if I can find what produced it.

Cheers John

[attachment deleted by admin]
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Based in Derby 5Nm NW of EGNX

EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #19 on: March 14, 2009, 11:18:17 PM »
Its not just Gulfstreams giving out spurious position data I have ATP's doing same G-OAAF,G-BTPE and G-BUUP

[attachment deleted by admin]
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DaveReid

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Re: What Did I Pickup 280nm Out?
« Reply #20 on: March 15, 2009, 07:50:43 AM »
Quote from: EGNXR on March 14, 2009, 11:18:17 PM
Its not just Gulfstreams giving out spurious position data I have ATP's doing same G-OAAF,G-BTPE and G-BUUP

That's very strange.  None of those aircraft has ADS-B, so you shouldn't be seeing coordinates at all for them.

My money is still on a decoding bug.
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EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #21 on: March 15, 2009, 10:02:14 AM »
If none of these are ADS-B why is rb saying they are? I've seen them tracking across the screen in and out of EGNX most evenings.

It appears as that its one of these aircraft that has created my spike to the south.

see gif below the coordinates match the tip of the spike in my previous polar diagram

[attachment deleted by admin]
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tarbat

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Re: What Did I Pickup 280nm Out?
« Reply #22 on: March 15, 2009, 10:08:00 AM »
Interesting.  I've got G-BTPE in my log, but only with start/end positions of N12 00.0 E000 00.0.  And G-BUUP only has start/end positions of N12 00.0 E000 00.0 and N24 11.3 E000 00.0.

These are obviously spurious numbers, but are they being transmitted by the aircraft, or misintepreted by the RB software?  Given that it's the same spurious value for 2 different aircraft, my guess is that RB is misintepreting the data.

Can others search through their logs for obvious spurious lats/longs.
« Last Edit: March 15, 2009, 10:27:14 AM by tarbat »
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DaveReid

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Re: What Did I Pickup 280nm Out?
« Reply #23 on: March 15, 2009, 10:57:10 AM »
Quote from: EGNXR on March 15, 2009, 10:02:14 AM
If none of these are ADS-B why is rb saying they are? I've seen them tracking across the screen in and out of EGNX most evenings.

Well I'm prepared to be convinced by a radar screenshot  :-)

Are you sure you aren't confusing those aircraft with some of the other ATPs like G-MANH and the former G-MANP, which do have ADS-B ?
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tarbat

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Re: What Did I Pickup 280nm Out?
« Reply #24 on: March 15, 2009, 11:08:07 AM »
Okay, an analysis of my logs show only the following aircraft with spurious lat/long:
G-BTPA   N12 00.0 E000 00.0   N12 00.0 E000 00.0
G-BTPA   N12 00.0 E000 00.0   N53 57.7 E000 00.0
G-BTPA   N78 00.0 E000 00.0   N66 00.0 E000 00.0
G-BTPE   N12 00.0 E000 00.0   N12 00.0 E000 00.0
G-BTPE   N12 00.8 E000 00.0   N12 00.0 E000 00.0
G-BTPF   N12 00.0 E000 00.0   N12 00.0 E000 00.0
G-BTPF   N54 00.0 E000 00.0   N12 00.0 E000 00.0
G-BTPF   N78 00.0 E000 00.0   N12 00.0 E000 00.0
G-BTPF   S42 00.0 E000 00.0   N12 00.0 E000 00.0
G-BUUP   N12 00.0 E000 00.0   N24 11.3 E000 00.0
G-BUUP   N12 00.0 E000 00.0   N54 00.0 E000 00.0
G-BUUR   N12 00.0 E000 00.0   N24 11.3 E000 00.0
G-BUUR   N12 00.0 E000 00.0   N54 00.0 E000 00.0
G-BUUR   N12 00.0 E000 00.0   N54 00.0 E000 00.0
All British Aerospace ATPs, so maybe it's an aircraft problem rather than a RB problem.  Unless other aircraft types are also showing the same problem?
« Last Edit: March 15, 2009, 11:28:54 AM by tarbat »
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besty

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Re: What Did I Pickup 280nm Out?
« Reply #25 on: March 15, 2009, 11:08:56 AM »
Hi all I've got 10 ATP aircraft showing as ADSB of these 9 are showing same as Tarbat, only one is showing what looks like correct data, that is

400749  G-MANH   ATP   Atlantic Airlines

http://farm4.static.flickr.com/3120/3356302948_e724a2a165_b.jpg

400FEB G-BUUR  ATP  Atlantic Airlines


http://farm4.static.flickr.com/3537/3355484335_7a4e3053fe.jpg
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jgrloit

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Re: What Did I Pickup 280nm Out?
« Reply #26 on: March 15, 2009, 11:19:35 AM »
ATP data seen here.

G-BUUP - invalid positions
G-MANH - Valid Positions
G-BTPE - invalid positions, but value varies by date
G-BTPA - invalid positions, vary by date - fixed within date
G-BTPF - as BTPA
G-BUUR - invalid positions
G-BTPH - ADSB  not seen, short isit to box Less than 1 minute.

Values look similar to those from Tarbat.
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EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #27 on: March 15, 2009, 11:31:07 AM »
Quote from: DaveReid on March 15, 2009, 10:57:10 AM
Quote from: EGNXR on March 15, 2009, 10:02:14 AM
If none of these are ADS-B why is rb saying they are? I've seen them tracking across the screen in and out of EGNX most evenings.

Well I'm prepared to be convinced by a radar screenshot  :-)

Are you sure you aren't confusing those aircraft with some of the other ATPs like G-MANH and the former G-MANP, which do have ADS-B ?

Looks like I'm on ATP watch this week then:-)

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Based in Derby 5Nm NW of EGNX

EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #28 on: March 15, 2009, 01:13:57 PM »
I have been through Mylog and these are all aircraft with position data outside of my maximum polar range. By type.

ATP LX-WAL,SE-MAP + those already quoted
C650 D-CMPI
CL60 HB-IVS,XA-JVL
H25B VP-CLU below is a gif as this has spurious height info also
GLF5 00-0128,00-0129,01-0076,97-0401,99-0402,N522EE,N508P,N526EE,N531AF,N596GA,
N673P,N740SS,VP-BNL,VP-CES
FA10 F-GPGL

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Based in Derby 5Nm NW of EGNX

EGNXR

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Re: What Did I Pickup 280nm Out?
« Reply #29 on: March 15, 2009, 09:00:59 PM »
JAL B744 purple rain off the network thats another type to add to the list:-(
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