[GreenKeys] 10cps shift

[Larry Tighe]

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.

lar
----- Original Message ----- 
From: "Nick England" <navy.radio at gmail.com>
To: <greenkeys at mailman.qth.net>
Sent: Tuesday, December 01, 2009 11:48 AM
Subject: [GreenKeys] 10cps shift


> Just noticed there was a field change to the AN/URA-8A converter to
> provide better margin for 10cps shift operation.
> When/where was 10cps shift used? - seems awful narrow for 1950's
> technology to me.
> I'm guessing it may have been used for VLF - if you're transmitting
> into a high-Q antenna at 18kc there ain't much wiggle room.
> cheers,
> Nick K4NYW
> www.navy-radio.com
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