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03-16-2015, 05:28 PM
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Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
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We have this problem with NavWorx in Socal... about 50% of the time.
__________________
Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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03-16-2015, 05:40 PM
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Join Date: Nov 2014
Location: Plano, TX
Posts: 225
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Quote:
Originally Posted by dynonsupport
We've had a few reports of ghosting recently, and most have been in that area as well, so it does likely indicate something unique is up. In the datalogs we have seen, something very odd is happening.
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I am getting ghosting on TIS in NJ. Is that the same problem or is that different altogether?
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03-16-2015, 08:02 PM
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Join Date: Jan 2005
Location: Columbia, SC
Posts: 804
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Me to @ KCUB/KCAE
Quote:
Originally Posted by mikehoover
I have had this issue for the last several flights in the Columbia, SC area. Not a problem until recently. I gave up trying to outrun and outmanuever my ghost. He's good!
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Same as Mike here in Columbia, SC.
Mike has Dynon equipment.
I have GRT equipment.
Previously all worked fine.
I too noticed it within the last 30 days or so.
Also have a friend in the Brooksville/Tampa area whose system that had previously worked fine, now has ghosting.
I wonder if there was a recent upgrade of software to the ground stations.
Anybody on the list here know?????
James
p.s. THe ghosting **MIGHT** have gone away when I had flight following that required a frequency change to controllers at a different location. I need to verify that.
__________________
James E. Clark
Columbia, SC
RV6 Flying, RV6A Cowling
APRS
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03-16-2015, 08:58 PM
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Join Date: May 2007
Location: Canal Winchester, Ohio
Posts: 417
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James and Mike
Have you guys flown north recently up towards Spartanburg. If so did you have ghosting. I notice my ghosting went away once I got about 20 miles north of Macon. I tracked this
Ghosting all the way home Sunday. KFMY fort myers to KLHQ. My ghosting started around KLAL. South of there I did not see any. Curious if anyone that flys regularly south of KLAL has noticed any ghosting in the past 30 days
Geoff
__________________
Geoff Combs
RV-10 N829GW 865hrs
1940 Piper J3 Cub
Rans S21
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03-17-2015, 05:07 AM
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Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,089
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Quote:
Originally Posted by Aerosport1
James and Mike
Have you guys flown north recently up towards Spartanburg. If so did you have ghosting. I notice my ghosting went away once I got about 20 miles north of Macon. I tracked this
Ghosting all the way home Sunday. KFMY fort myers to KLHQ. My ghosting started around KLAL. South of there I did not see any. Curious if anyone that flys regularly south of KLAL has noticed any ghosting in the past 30 days
Geoff
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Geoff, I departed X35 to APF Sunday about an hour after you and flew right over LAL. No ghosting the entire way home.
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John Mastro
RV-8
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03-17-2015, 11:51 PM
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Join Date: Jan 2005
Location: Pensacola, FL
Posts: 97
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I've been flying throughout my local area around Pensacola without any problems using my NavWorX system. Of all the equipment in the aircraft, this one I love the most. In this high training area, this equipment is so helpful in spotting hard to see, fast moving aircraft. I've never seen any Ghosts on the screen around Pensacola, that was until Monday morning. Flying north out of Pensacola, I had a Ghost until I was about 50 miles out. Then the Ghost stopped. I can't remember if it was after a squawk change or not. I did have another episode of Ghosting nearly a year ago around Knoxville, TN. When I talked to NavWorX, I remember then asking me my squawk code at the time. Therefore, assigned squawk codes may have something to do with Ghosting.
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03-18-2015, 02:34 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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I found an FAA document on Google, that now I can't find again. Here's a paraphrase of what it said:
The FAA ground stations get data from UAT out, Mode S-ES out, and ground based radar. The software is supposed to identify the aircraft and merge the data together, so that if there is both a 1200 mode C radar target and an ADSB-out target for the same aircraft, only the ADSB data is sent out on the uplink to ADSB-in aircraft receivers. The ADSB data has N numbers attached to it, so aircraft receivers can easily identify it as themselves and filter it out. However, sometimes the software fails and sends both ADSB data and radar data out the uplink. In this case, the radar data may show as a "ghost" on ads-in systems, since it is an unidentified target.
So my question: when you see a ghost, do you ever see your N number associated with it? If the answer is no, then the above may be an explanation.
An interesting test, for those with UAT systems, would be to turn off your mode C transponder and see if the ghost goes away. (Of course this is illegal unless you happen to be in one of the few remaining areas of uncontrolled airspace).
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03-18-2015, 04:31 PM
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Join Date: May 2007
Location: Canal Winchester, Ohio
Posts: 417
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Bob
I do not see my N-number when getting the ghost. However what's interesting is that with the stratus 2 I also have when I first open up foreflight after having
it off I will see my N-number for a couple seconds than the N-number goes away but the ghost still remains.
Thanks Geoff
__________________
Geoff Combs
RV-10 N829GW 865hrs
1940 Piper J3 Cub
Rans S21
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03-20-2015, 07:13 PM
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Join Date: Mar 2009
Location: Grand Rapids, MI
Posts: 1,004
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Earlier this week, I made a flight from Michigan to southern Ohio. I used flight following all the way down and had ghosting about half the time.
On the return trip about two hours later, I didn't use flight following and had zero ghosting! Traveled the exact route, 7500' going south and 8500' traveling back north.
Is there a connection?
Data points:
GRT HX
Sky-Radar D2 ADS-B receiver
__________________
Paul K
West Michigan
Unfortunately in science, what you believe is irrelevant.
2020 donation made, exempt but worth every dime!
Last edited by Paul K : 03-20-2015 at 07:15 PM.
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03-20-2015, 07:31 PM
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Join Date: Mar 2008
Location: Guelph Ontario
Posts: 267
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No more ghosting!
In recent weeks I have been experiencing the same problem as Geoff with own ships transponder Ghosting in central Florida. It was pretty consistent for me there for a while although at times it would go away during flight and then re-appear minutes later.
It is very annoying, not to mention distracting, to have the 2 mile warning window pop up as it does on the GRT HX screens when all it is indicating is your own airplane.
However, I am happy to report that I saw no ghosting on a 150nm trip from Dunnellon airport (X35) in central Florida to Ft. Meyers (KFMY) in South Florida on Thursday morning and returning today.
At first I thought I had an equipment problem but based on previous posts and this experience it seems to me that the ADS-B system might have had issues and that they have been fixed.
__________________
Ivan Kristensen
Guelph, ON. Canada
RV-10 (C-GMDV) 1355hrs.
Dual GRT 8.4" HXr EFIS, VP-200, TT A/P, Avidyne IFD440, uAvionixX ADS-B out, Sky Radar WX and Traffic, Dual EI's (one Lightspeed & one SDS CPI)
RV-14A under construction.
Link to my build site:
https://ivankristensen.smugmug.com/B...ENTAL-aircraft
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