[time-nuts] tube GPS receivers - delay memory

[Mike Naruta AA8K]

Could this be one of them Brian?

Mike - AA8K

On 06/24/2013 06:58 AM, Brian Alsop wrote:
>
>
> Interesting you should mention this.  One summer job had me
> working at a company that made acoustic delay line memories.
> Interesting beasties. You stuck the data in at one end . The
> output was connected back to the input to recirculate the data.
> One wound the magnetic wire in a flat rectangular box.   A
> torsional mode was used rather than push/pull.  A maximum of
> about 50 milliseconds of memory was possible.  A special near
> zero temperature coefficient wire was used as the medium.  One
> used either return to zero or non-return to zero data formats.
> NRZ logic doubled the memory.  Part of the job involved laying
> out PCB's by hand for the electronics.  IC's were just coming on
> the scene.  RTL logic was the only thing available.  For
> military applications "flat packs" were used.  Through hole IC's
> were used for everybody else. Interesting that flat packs
> disappeared for about 20 years until SMT became the rage.
>
> The company eventually died due to lack of suitable wire and
> other memory advances.
>
> Brian
>
>
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