[time-nuts] tube GPS receivers - delay memory

[Brian Alsop]

No.  I'd say the electronics is several years more advanced.  Not the 
same company.   However, the idea and construction is essentially the same.

73 de Brian/K3KO

On 6/25/2013 18:23, Mike Naruta AA8K wrote:
>
> 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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