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 41 
 on: July 28, 2014, 08:09:47 PM 
Started by sean - Last post by sean
What is the passband of each dongle and what kind of front-end filtering are you doing to eliminate images?

There are many different brands of dongles, with different chipsets.  They are definitely not all created equally.  With a good dongle (decent chipset), 3.2 MHz is possible.  So, with 2 dongles you could cover 6.4 MHz of continuous BW, or two chunks of 3.2 MHz.  I've looked at a lot of Class B airports, and 5 dongles would cover most of them - seems like a lot, 3 full Pi setups, but if you consider that you'd have $200 invested and 16-20 separate streams, plus either ACARS or ADS-B, it's not a bad deal.

As for front end filtering, it hasn't been an issue that I've encountered.  I've tried the various bandpass filters, but they haven't made much of a difference - only because they weren't really needed.

Sean

 42 
 on: July 28, 2014, 08:05:28 PM 
Started by sean - Last post by sean
While I think your project is a worthwhile project I do have a question about your cost calculations. 

Under a traditional setup (PC & Scanners) you have "8 Uniden Scanners: $250".  Does that means you're getting scanners at $31.25 each?  Where???

My next question, are you using 1 RTL Dongle per frequency?  If so does one Raspberry Pi have the power to handle 8 RTL Dongles and DarkIce to stream 8 audio streams.

Very interesting project which I'll be watching...

Thanks
George
www.MilAirComms.com

George,

I was being conservative on the costs so that it didn't appear that I was  trying to fit the budget into the goal.  I've purchased lots of BC350 scanners on ebay before for under $20 a piece, usually from a police department that swaps them out or some other large agency.  Agreed, though, it's tough to find them in quantity often.

It's custom software, written specifically for this purpose, and includes the streaming libraries (lame and shoutcast) natively in the program. The current configuration will handle 2 dongles per Pi, but we're using a powered USB hub to support the dongles, wifi adapter, etc.  The hub is included in the calculation, though.  So, if you could find the right mix of frequencies, you could stream 16 different frequencies from a single Pi and 2 dongles. 

Alternatively you could stream 8 frequencies and run dump1090 for ADS-B on the other dongle, or even acarsdec.  Heck, with 2 Pis you could do 75% of the ACARS frequencies simultaneously, ADS-B, and 8 channels of audio - for around $100-$125.

The software would technically work with MilAir, although I haven't tested it.  It's running at Oshkosh now with good results - that's the first real field trial to date.  If you're interested in trying it with MilAir, send me a PM.

Sean

 43 
 on: July 28, 2014, 06:51:27 PM 
Started by JTS97Z28 - Last post by swa4678
To the Delta pilot's point... the instruction was to taxi "via Mike". Not L5 M, L L6 M, L L10 M, etc.... just the ambiguous "M". Yes, common sense dictates you'd head straight out of the 3S ramp area, join L5, make the left onto M. But no, that wasn't the explicit route given.

Either way, kudos to the controller for both being level-headed in responding and managing to (just barely) hold back that laugh at the end.  grin

 44 
 on: July 28, 2014, 04:02:41 PM 
Started by kempboeing - Last post by kempboeing
Second

 45 
 on: July 28, 2014, 03:59:11 PM 
Started by kempboeing - Last post by kempboeing
JFK Ground

 46 
 on: July 28, 2014, 01:35:54 PM 
Started by JTS97Z28 - Last post by mindlesstux
At about 2:30,
Did I hear correctly and missed something?

Did he say he makes a mistake every 2-3 minutes?

 47 
 on: July 28, 2014, 01:10:33 PM 
Started by JTS97Z28 - Last post by ysitincoach
If it were fake, I would have expected the "real" delta pilot to chime in and say that it wasn't delta 2422 talking. Maybe the copilot was on the radio earlier?

Local news radio here in NYC carried the clip and gave credit to LiveATC...

Guessing the real pilots would only come forward in Delta's internal review of the matter.

 48 
 on: July 28, 2014, 10:43:30 AM 
Started by minimoa - Last post by RonR
Hello Terry, most of the time you'll see videos and pics posted in the Aviation News forum. At least that's where I've posted things like that.

Ron

 49 
 on: July 28, 2014, 10:41:40 AM 
Started by JTS97Z28 - Last post by RonR
If it were fake, I would have expected the "real" delta pilot to chime in and say that it wasn't delta 2422 talking. Maybe the copilot was on the radio earlier?

Local news radio here in NYC carried the clip and gave credit to LiveATC...

 50 
 on: July 28, 2014, 09:21:08 AM 
Started by JTS97Z28 - Last post by ysitincoach
FAKE?

Anyone else wonder if it's fake?

As in, perhaps someone else was on channel messing with the controller?

When the alledged DL pilot comes back to sass the controller, it sounds completely different than the other responses DL 2422 gave earlier in the recording.

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