On Sat, 05 Oct 2019 13:28:00 -0700, "shadow at shadowgard.com (via tml
list)" <xxxxxx@simplelists.com> wrote:

>Blish's Dirac radio wasn't too expensive and it was fast. In fact it
>was instantaneous. But it also had the problem that anybody with a
>Dirac radio got the message.

>It also had a "fun" flaw. Every message received started with the
>Dirac "bleep". This was a "loud" multifrequency signal "blip". Turns
>out that with the right equipment you could "spread it out" into
>every Dirac radio message *ever*.

And that was the clue I needed to find the story/book that it was in - _The
Quincunx of Time_, an expansion of an earlier story of his called "Beep".

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