From: mike 

On Thu, 15 Mar 2007 17:38:59 -0400, "Frank Haber"
 wrote:

>60 kHz!  Didn't know that.  That's ULF, almost.
>Submarines-in-midocean-at-30m-depth stuff.  Wires strung between Washington
>State mountantops.  Well, almost.
>
>I'd  wondered how the updates got through to RF-chanllenged Manhattan.


It used to also be 20kHz, but all the dogs within a 10 mile radius went
deaf.  So that frequency was discontinued.

 /m

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