[time-nuts] time sync by moonbounce

[Wes]

You talked me in to it.

Wes  N7WS


On 5/23/2020 8:19 AM, Jeremy Nichols wrote:
> Sufficiently interesting that I bought a paper copy through Abebooks. Looks
> like a somewhat later version, author given as Douglas Mudgway, title
> “ Uplink-Downlink:
> A History of the Deep Space Network 1957-1997.” “Oversized,” 674
> pages. Abebooks
> lists a couple dozen copies in both hardback and paperback at prices from
> reasonable to ridiculous, as is usual for bookstores.
>
> Jeremy
>
>
> On Sat, May 23, 2020 at 3:47 AM ew via time-nuts <time-nuts at lists.febo.com>
> wrote:
>
>> This is a must read. Could not put it down, JPL, NASA,  Eisenhowe,r did
>> learn a lot at the same time fascinating
>> Bert Kehren
>> In a message dated 5/22/2020 10:36:53 PM Eastern Standard Time,
>> jimlux at earthlink.net writes:
>>
>> Apparently, they used moonbounce between DSN stations to synchronize to 5
>> microseconds in 1968. It was easier and cheaper than flying cesium clocks
>> around. (And the Rb standards weren't good enough).
>> https://ntrs.nasa.gov/search.jsp?R=19770007245
>> History of DSN - mostly about politics, history, transmitters and
>> receivers, but a whole section on timekeeping, phase measurements, etc.
>> starting around page 133 (The DSN Inherent accuracy project), and the
>> discovery during Mariner that UTC and UTI were different enough to cause
>> nav errors.
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