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April 25, 2014, 01:03:56 AM
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 81 
 on: April 13, 2014, 04:34:39 AM 
Started by leiar - Last post by leiar
Yeah. Next to MH370 Wink

 82 
 on: April 13, 2014, 02:31:24 AM 
Started by Lynch_Christopher - Last post by dave
That's the new CAMRN sector frequency.  Been that way for a few months.

 83 
 on: April 13, 2014, 02:30:00 AM 
Started by Lynch_Christopher - Last post by Lynch_Christopher
I was looking at the JFK approach plates and saw that they have 182.12 listed and was wondering what sector this belongs to. I didn't see 128.12 on the N90 layout sheet.

 84 
 on: April 12, 2014, 11:02:29 PM 
Started by jvnanu - Last post by jermscentral
For us at STL, it doesn't really make much of a difference. Runway 6/24 isn't used all that much, but when it is, we typically only use 24 (operations on runway 6 are strange and only seem to serve to confuse the TRACON, though we have been known to use it), so when we tell someone to cross, we usually say to "cross runway 24". Almost all of our regular pilots know the route anyway, so they don't question it.

When the runway is inactive (such as 6/24 is most of the time for us), if the tower controller keeps the aircraft, he won't coordinate the crossing with Ground, even if Ground owns it. We consider it the same as using a taxiway, though we still call it a runway (example: "Taxi to the gate via Papa, Quebec, Charlie; cross runway 30L). Without the actual words "Cross runway XX", a pilot is not authorized to cross a runway, active or inactive. The only time we appreq a crossing is when Ground needs to cross an active runway.

 85 
 on: April 12, 2014, 09:51:54 PM 
Started by leiar - Last post by RonR
It looks like this will be one of those mysteries that will never get solved... Smiley

Sent from my SGH-M919 using Tapatalk

 86 
 on: April 12, 2014, 06:00:46 PM 
Started by av8tor172 - Last post by av8tor172
And if we get some good solar flares and some good Es (E-skip) conditions you're Pi will be heard around the world on 49.5.

I do a lot of DX'ing on 6 meters (50 MHz)  SSB and CW.  Actually have worked a JA (Japan) from Florida on 6 meter CW 2 years ago. Ok, I was running more power than a Pi, I was running about 1100 watts into a 3 element yagi.  He was running about the same....I think the hole in the Ozone still exists LOL...

George
www.MilAirComms.com

 87 
 on: April 12, 2014, 05:56:27 PM 
Started by av8tor172 - Last post by av8tor172
I'm trying to write my own software that decodes signal from RTL Dongle connected on Raspberry Pi.

I'm actually having some success at this.

But what I can't find on line or figure out is how does programs such as Virtual Radar know to flag a mode-s message as being from a Military Aircraft?  Is there a bit set in one of the DF (Downlink Format) messages?  OR is Virtual Radio (and other programs) simply comparing the aircraft HexCode against a database of known Military hexcodes?

I know that DF 19 and DF 22 are reserved for military uses, do these contain data if the Mode-S message is from a military aircraft?  I can say that DF 19 and DF 22 are empty in civil aircraft mode-s messages because I have a "C" program here just looking for those two Downlink Formats and so far they've been blank.

Any help would be appreciated,
George
www.MilAirComms.com

 88 
 on: April 12, 2014, 03:51:35 PM 
Started by av8tor172 - Last post by InterpreDemon
Well, all you have to do if transmitting from a wide deviation FM transmitter to a narrow FM receiver is simply reduce the tx modulation (audio input level to the xmitter) down... it will then be "narrow" deviation and it will sound just as if it came from a "narrow" transmitter, which in fact the Pi would now be. You put a 60" wire antenna on that output pin and you'll get some pretty amazing coverage on 49.5

I had one of those early Sony cordless phones years ago, I gutted the base T/R unit by removing the existing pc-board mounted duplexer and attaching the tx and rx to a proper external six meter duplexer and coaxial dipole antenna up on the tower, and my cordless phone worked over the entire neighborhood.

 89 
 on: April 12, 2014, 03:42:12 PM 
Started by leiar - Last post by leiar
Patience has never been my virtue, but I'm still learning Wink

Thanks a lot!
It basically confirms what I have found. I have just heard the ATC instructing the flight to join downwind for RWY36 and then nothing, so I was wondering whether there might have been something I missed.

Anyway, pity, because I am still curious:)

 90 
 on: April 12, 2014, 02:39:14 PM 
Started by av8tor172 - Last post by av8tor172
Yes, it will transmit on 49 MHz, just did it.  One think to note, the Pi will be transmitting on WBFM. I can't remember if the baby monitors were wideband or not.  However I just set my Pi up to xmit on 49.000, tuned scanner to 49.000 and in NFM it sounded "ok".  When I switched the scanner to receive WFM it sounded perfect.....

George
www.MilAirComms.com

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