[GreenKeys] FSK on WABC

[Larry Tighe]

Rich et.al.,
There may have been much more to the WABC FSK'ing.  They were also running 
SSB with carrier for quite some time.  They ran lower sideband and I don't 
know what that had to do with the FSK if anything..

On the standard AM radio, it didn't matter.  FWIW, the freq tolerance for an 
AM broadcast carrier is plus or minus 20 cycles so the FSK wouldn't have 
bothered the FCC   LOL.

lar
----- Original Message ----- 
From: "Richard Dillman" <ddillman at igc.org>
To: "Larry Tighe" <larryradio at worldnet.att.net>; "Nick England" 
<navy.radio at gmail.com>; <greenkeys at mailman.qth.net>
Sent: Tuesday, December 01, 2009 12:44 PM
Subject: FSK on WABC


>
>>The military had contracted with WABC  770 KHz in NYC to operate FSK, 
>>very,
>>very narrow, in the 70's.  I was unable to find out much about it in those
>>days...it was imperceptible on the AM radio.
>
> I read your post with great interest.  A friend was a studio engineer at 
> WABC at the time and once told me how he happened to notice that the 
> needle on the station's frequency monitor was bouncing all over the scale. 
> He was told "you don't need to worry about that" but later found out about 
> the program you mention.  I was never able to find anything more about it 
> so I was glad to see your post as confirmation that the program did indeed 
> exist.
>
> One assumes it was for submarine communications but I wonder if anyone has 
> any further details.
>
> Regards,
>
> RD
>
> =================================
> Richard Dillman, W6AWO
> Chief Operator, Coast Station KSM
> Maritime Radio Historical Society
> http://www.radiomarine.org
> =================================