[GreenKeys] Fwd: Very Slow Shift Frequency keying?

[Gerry Block]

as a youngster i was at swampscott mass ham fest and attended a discussion of that very system over a  dinner meeting.  the person presenting was herbert hoover jr. he brought an entire re-rolled tty paper printed (error free) with quick brown fox repeated continuously. sent over i think it was wabc.  
i'll guess the transmission rate was 1 baud. 
gerry
ad6mc

Sent from my iPhone

> On Apr 20, 2023, at 10:59 AM, David I. Emery <die at dieconsulting.com> wrote:
> 
> On Thu, Apr 20, 2023 at 04:19:23PM +0000, William Strangfeld wrote:
>> ???
>> At least one person spotted it. A local Cincinnati ham told me long ago that he somehow noticed the WLW carrier frequency was changing very slightly - maybe 10 cycles. So he called the station engineer. The engineer denied everything of course. This probably was in the 60s. Never heard anything connecting this to WLW???s super power days though.
> 
>    I remember noticing what sounded like very narrow shift FSK on a
> couple of AM broadcast carriers  back then... so very narrow that it was
> hard to be sure that one was really hearing it... or that it wasn't a
> stability problem with the radio (a R-390A)... never did get around to
> trying to copy it successfully though I did have 85 Hz shift VFT mux
> RTTY capability back then. 
> 
>    Was not very surprised to hear about it when it became public
> years later - sorta confirmed I wasn't just imagining something that was
> really there.
> 
> 
> -- 
>  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
> "An empty zombie mind with a forlorn barely readable weatherbeaten
> 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
> celebration of what could have been, but wasn't and is not to be now either."
> 
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