[AMRadio] RE: AMRadio Digest, Vol 49, Issue 37


Clarke, Tom AIR4.0P NATOPS frederic.clarke at navy.mil
Mon Feb 11 17:31:59 EST 2008


For the greatest part of aviation Radio, whether it is Civil OR Military 
- VHF comms are Full AM (DSB w/Carrier).

1) I am a pilot
2) I also have the military ground based receivers.

Now the twist!

For transoceanic flights, BOTH civil and Military use SSB.  Mil runs in 
the 6, 8, 9, or 11 Mc regions.  WX is sent "just" a bit below the bottom 
end of 80M - SSB.


-- 
Bob Bethman/NØDGN/BC-610/Northern Radio 
SP-600 Manassas, VA - MultiBand Dipoles
----------------------tom sez------------------------------------

Here are some mil (USAF HF Global Comm System)freqs:

4724.0 6739.0 8992.0 11175.0 13200.0 15016.0 and 6712.0 (Croughton only)
These are the primary freqs, there are a ton of "discretes" that are used also.
Listen for callsigns, Anderson (Guam), Andrews, Croughton (UK), Lajes (Azores),
Scott (IL), MacDill (FL), Incirlik, Sigonella, and others.

Civil (ARINC) freqs are numerous depending on the geographical area and may be found
on the appropriate ARINC charts or in the DOD Flight Information Handbook.  They run from
3-18 MHz (try 3414, 6568, 8864, 8846)  If you spend some time listening you will hear the
aircraft checking in and receiving backup freqs and Selcall checks (4 tone combos that sound
a chime and light a light in the cockpit).  Pretty soon you will have a whole list of freqs
for the particular "family" for that area.  You can go to the ARINC homepage and look at the 
HF handbook and find out what all the messages mean. http://www.arinc.com/downloads/13393.pdf 

By the way, the military uses ARINC for airways (postion reports, clearances, etc) and HF-GCS for 
command and  control.  You will hear phone patches from the aircraft to the weather shop 
at the destination ("Andrews Metro (pronounced meetro)this is SAM 27000, request Andrews weather 
for 2300Z arrival, over"), as well as maintenance status reports, etc.

A good choice for weather is 10051.0 KHz.  NY, Gander and Shanwick transmit weather obs on
a rotating basis.  Speedbird London (British Airways) used to be on 10093, might still be.

Try listening for the coasties (USCG) on 5696.0

Lots of fun things to listen to, out there!

73 de Tom/W4OKW
Old pilot and slightly older Ham.


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