Messages

31

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: November 05, 2018, 07:59:18 am »

I did some analysis over the weekend using Google Earth and importing the kml files from SD and FR24.
I haven't played much with Google Earth but it has some really good capabilities.
I think the issue is an FR24 issue as FR24 gets the calculated groundspeed wrong if the transponder "pings" are irregularly spaced.
In the example I was looking at there was one instance of a gap in "pings" of nearly 60 seconds. FR24 "speed" varied considerably for a few seconds at this point.
My friend was flying over the weekend so I could observe his flight in realtime.
FR24 showed fluctuating groundspeed whereas PlaneFinder showed the correct groundspeed which didn't vary by more that 1-2 Kt.
I have some support questions logged with both FR24 and PlaneFinder. Will let you know what they say.

Tony

32

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: November 02, 2018, 11:08:35 am »

Chris,

Your symptoms are identical to what my friend gets, except his Funke isn't currently at the latest h/w version.
He is about to spend more money with Funke!
I contacted FR24 asking how they calculate speed but the answer wasn't informative.
They also said you cannot tell from the downloaded FR24 CSV file if the data is MLAT derived or true ADS-B Out.

Is there any way for the PAW "system", including OGN link-up etc. to examine what is actually being transmitted ADS-B -wise?

Tony

33

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: October 31, 2018, 11:42:16 am »

Hi Lee,

Let me get back to you about this issue.
It has it has just been discovered that Funke never upgraded the hardware, just the firmware, although they were asked to do both.....
Hardware is still at the "non ADS-B" level.

Thanks

Tony

34

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: October 30, 2018, 08:18:24 am »

Hi Lee,

The trace is ADS-B as he was flying at 2000 ft in an area of good FR24 coverage (southern England).
Is there a way to check for ADS-B data when viewing playback tracks on FR24?

Are you saying that the Mode S ADS-B data transmitted via a transponder includes ground speed messages?
I thought FR24 calculated that based on the time taken to travel between Lat/Lon corordinate pairs.

Thanks

Tony

35

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: October 29, 2018, 01:57:24 pm »

Well, my friend has had his Funke back and it had a firmware upgrade.
Unfortunately it has made no difference to what is seen on FR24. His cruise speed varies signifcantly from 40 Kt or less to 250 Kt or more.
He doesn't fly like that!

I can only think of two reasons why this may happen:
1. The ADS-B Out position data is in error somehow although the FR24 track looks reasonable.
2. The position data is somehow being stored/delayed occasionally by the transponder before transmissions. So the calculated speed between data transmisisons (position) varies.

Any ideas where to look to fix this issue?
Oh, it is a PAW Classic.
Tony

36

Technical Support / Re: Using PAW as a source for ADS-B ES out

« on: September 27, 2018, 09:23:50 am »

Hi Lee,

Thanks. I think the issue is with his Funke TRT800 transponder needing a firmware upgrade.
Will report back when his issue is resolved.

Tony

37

Technical Support / Using PAW as a source for ADS-B ES out

« on: September 26, 2018, 09:37:55 am »

A general question:
Does PAW send continuously updated position data to the connected transponder for ADS-B ES out?

A friend with this setup is seeing some strange data on FR24, especially airspeed (in FR24) which is all over the place.

If a Mode S ES transponder isn't interrogated by ground radar how often should it send ES data all by itself?
Every 16 seconds or thereabouts?
Tony

38

General Discussion / Re: Bridge board V1 vs V2

« on: June 26, 2018, 08:23:41 am »

Keith,

In semi-non techical terms, what is the issue you are referring to?
Is it the potential to saturate the ADS-B out frequency when many aircraft are simultaneously transmitting ADS-B out data?

Tony

39

Technical Support / Re: Last chance saloon - PilotAware Mystery

« on: May 23, 2018, 08:19:30 am »

Garrick,

"when I transmit on the radio it causes the GPS to drop on the Transponder and the Skydemon will then lose Satellite reception"

Do you mean you loose GPS reception on your SD device when you press your VHF radio's PTT button?
If so, does the same thing happen even when PAW is powered off?

If so, it sounds like your VHF transmission if causing the issue.
How do you ensure your transponder and VHF radio antenna ground planes are all earthed/connected?

Tony

40

General Discussion / Re: TCAS

« on: May 04, 2018, 10:38:34 am »

Alan,

Thanks - didn't think to check online first!
The thing I couldn't figure out is how TCAS was able to determin the location of the "conflict" without the "conflict" transmitting position data.
I didn't realise that TCAS equipment involves a directional antenna for determining direction information.
Obviously a bit more sophisticated than my basic transponder antenna!

Tony

41

General Discussion / TCAS

« on: May 03, 2018, 08:32:55 am »

I know this isn't really anything to do with PAW but expect someone will know the answer.
Regarding TCAS fitted to CAT and big GA, what does TCAS process to determine if there is a potential flight risk?

My question is prompted by an Airprox report, regarding glider tug aircraft, in the spring 2018 issue of the GASCO Flight Safety magazine.
The recommendation (regarding a specific Airprox) was for tug aircarft to be transponder equipped.

So, I have a Trig Mode S transponder and ADS-B out in my aeroplane. My ADS-B out has a SIL=0 setting.

Will TCAS respond to my transponder transmissions if a flight risk is probable?
I don't think my ADS-B Out data will be processed due to the SIL flag setting.

Thanks

Tony

42

Technical Support / Re: Suitable battery pack?

« on: February 09, 2018, 01:35:30 pm »

Hi Peter,

So a fully charged Anker unit will power PAW for at least 10 flying hours?

Tony

43

Technical Support / Re: Suitable battery pack?

« on: February 08, 2018, 09:29:08 am »

Can someone explain "20100mA/hr"?
My knowledge of battery capacity means this battery will deliver 5V at:
20.1A for 1 hour
2.01A for 10 hours
0.201A for 100 hours

Is this correct?

Tony

44

Technical Support / Re: Sky Demon - connectivity screen query

« on: November 22, 2017, 08:44:20 am »

Ah, yes! I use a Samsung 3G smartphone for SD so haven't experienced that particular issue.
Tony

45

Technical Support / Re: Sky Demon - connectivity screen query

« on: November 21, 2017, 08:04:53 am »

From my experience I was only getting the "internet lost" pop-up every 30 mins or so, so not that annoying.
With data on it is good to see realtime updates of new TAF/METAR reports.
Perhaps not really an issue for me as normally cruising at 1500-2000 ft?
Tony