[MilCom] ADS-B emission type

[Brian]

All planes using 1090MHz around the world.
I heard FAA might use 978MHz for some stuff... More on the Wiki.
<http://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast>


This is the best map to view of the ADS-B aircraft flying inside the United States area.
Some area is not covered with a receiver yet.
http://planefinder.net/


Might want to ask on this forum. Many users(DaveReid) knows the details about ADS-B signals.
<http://www.radarspotters.eu/forum/index.php>


My location in Southern California. 
I get around 15-20 ADS-B aircraft showing doing the busy time out of 80-100 aircraft.
Right now at 8:51pm I only have 7 aircraft with ADS-B out of 54 aircraft on the list.

I heard most places in the United States, You will only see around 10-20 ADS-B aircraft at anytime
of the day. 


-Brian
RadarBoxUSAlogs - United States
<http://groups.yahoo.com/group/radarboxusalogs/>


-----Original Message-----
From: John Kintz
Sent: Saturday, April 16, 2011 8:34 PM
To: milcom at mailman.qth.net
Subject: [MilCom] ADS-B emission type

To the Group -

I'm developing an interest in ADS-B monitoring as an adjunct to MilCom.  
In an attempt to see what type of ADS-B signal reception I might be able 
to get at my location, I thought I might try to receive some ADS-B 
signals "in the rough" with my IC-8500 communications receiver.  
According to several articles I have researched, ADS-B apparently uses 
the frequency 1090 MHz.

Can anyone tell me the following...

 >> If not 1090 MHz, what is the correct frequency for ADS-B?

 >> What type of radio emission is an ADS-B signal (i.e. - what type of 
modulation is it)?

 >> I am currently receiving a WFM signal on 1090 MHz; It is a very 
brief pulse, repeating every 12 seconds. 

Might this be an ADS-B signal?  If not, can anyone shed any light on how 
to best monitor these signals with a standard comm receiver?

I fully understand that a specialized receiver and a PC are necessary to 
decode any intelligence from ADS-B transmissions.  At this point, I 
would just like to see if I can receive ANY related signals at my location.

Thanks in advance for your input.

John