11223.0 KHz LSB RTTY Traffic

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blantonl

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Hi Folks,

I've got a very strong RTTY Station coming in S9+ into South Texas, on 11223.0 KHz. Anyone know the baud/shift? Can anyone decode?
 

n4yek

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Apr 20, 2004
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Newport, Tennessee
A search turned up that the frequency is utilized by 2 different countries:
1) French AF
2) USAF/Canforce Alaska

Here is other information on the sound:

HELLSCHREIBER: FAX-like mode in that it was used to send pictures but
works more like common RTTY. The Siemans systems listed
below used start/stop signalling (FSK) and the Field HELL unit was semi-synchronous.

A couple of different machines were available:

Name | Paper width | chars per min | chars per sec | baud rate | bandwidth | tone freq
---------------+-----+-----+----+-----+------+--------------------------
Siemans GL72 | 9.5mm | 367.8 | 6.13 | 300 | 600Hz | 1000Hz
Field HELL | 15mm | 150 | 2.5 | 122.5 | 360Hz | 900Hz
Siemans HELL 80 | 15mm | 300 | 5.0 | 300 | 900Hz | 1260

I don't know if this is what you are hearing, but it fits the frequency you are hearing it on.
Take care.
 
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