Re: Selcal HF Technical info ????

Date:         17 Oct 99 23:29:56 
From:         "David G. Davidson" <tristar500@home.net>
Organization: @Home Network
References:   1
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In article <airliners.1999.1080@ohare.Chicago.COM>, airnig@bigfoot.com (N.Smith) wrote:
> Does anyone know the specs for the multi tone selcal signal used on
> HF, and the way it is composed into two tone bursts from a 4 letter
> code ???

SELCAL doesn't care about radio frequency. It's input comes from a HF or VHF
rcvr in the audio freq range. The freqs for the letters are (all in HZ)

A    312.6
B    346.7
C    384.6
D    426.6
E    473.2
F    524.8
G    582.1
H    645.7
J    716.1
K    794.3
L    881.0
M    977.2
P    1083.9
Q    1202.3
R    1333.5
S    1479.1