[Lowfer] 22.7 kHz

[David L. Wilson]

> In a message dated 2/10/2011 9:14:36 P.M. Eastern Standard Time,
> dwilson314 at verizon.net writes:
> 
> It's transmitted a typical TACAMO type message (in 50  Bd/50Hz)
> RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYKKKKKKZCZCZCZXLLXLLXLL
> 
> Congratulations Dave,
> That is a real accomplishment! I have always wondered if it was possible
to
> get some kind of copy from these narrow-shift RTTY transmissions on VLF.

Been copying them for at least 15 years.  (I cannot remember if I copied
them earlier than that but possibly did).
 
> Where did you find a program that would copy 50Hz shift RTTY?

Multipsk in 85 Hz shift mode will copy them fine even though it is a 50 Hz
shift.   
I also (and for a much longer time) use an Infotech M8000 multi-mode decoder
(company no longer exists).  This is a hardware device. 

> Have you been able to copy anything from some of the other narrow shift
> RTTY VLF stations like GQD on 22.1 from the UK , or FTA 20.9 from France?

I have never been able to copy any MSK on VLF in the clear.  I did also copy
the SAC SLFCS stations in Hawes, CA (37.2 kHz) and Silver Creek, NE (on
29.5, 34.5, and 48.5 kHz) with same format traffic (EAMS) but those stations
disappeared years ago.  Those stations also used MSK as well as the 50 Bd
FSK.  In fact, the SAC stations even once used 5 Bd (not a typo) Baudot FSK
in the same format which some mistook as encrypted cw.  I copied that mode
with a surplus ink/paper tape recorded and hand decoded the result.    I
also copied a defense contractor doing a test with 50 Bd/50 Hz on several
frequencies between 25 and 50 kHz years ago.  I called them and they
inserted my name and thanks into the transmission.