[GreenKeys] TTY over BC Xmitters ( was That's not a RTTY station........)

[Duncan Brown]

You reminded me of this topic an I thought I had a document on it, but 
couldn't find it.
I searched on the Internet and found a government document with the same 
title & authors:

https://apps.dtic.mil/dtic/tr/fulltext/u2/800669.pdf

Looks like they did trials with over a dozen BC stations, both high 
power & low.

I'm going to try to read it now if it doesnt put me to sleep.

Have fun,

Duncan
K2OEQ

On 1/23/2020 18:02, Jim Haynes wrote:
> On Thu, 23 Jan 2020, Bruce Gentry via GreenKeys wrote:
>>
>> What was the speed with the experimental trials of 10 cycle FSK on clear
>> channel AM broadcast stations?�
>>
> The shift was +/- 18 Hz to stay within the FCC requirements that the
> carrier frequency be within +/- 20 Hz of the assigned frequency. The
> baud rate was 75 and the demodulator was said to be one designed for
> 85HZ shift.
>
> Earl E. Selover, David A. Griffith, John R. Martin, and Donald Spector
> Use of Commercial Broadcast Stations for Emergency DOD Communica-
> tions. IEEE Transactions on Communication Technology COM-15:4, Au-
> gust 1967, p. 579.
>
>
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