Re: Pioneer Anomoly


"John C. Polasek" <jpolasek@xxxxxxxxxx> wrote in message
news:otbkb1t2ko0hf53jkis7chjrdvvodl0fq5@xxxxxxxxxx
> On Wed, 22 Jun 2005 23:38:02 +0100, Jonathan Silverlight
> <jsilverlight@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>>In message <24ejb1hp7qigjj6n9uall317i7gc8amngi@xxxxxxx>, John C. Polasek
>><jpolasek@xxxxxxxxxx> writes
>>
>>>More correctly, it's that both craft seem to lose velocity in time
>>>along their velocity line, regardless of direction. Your version
>>>implies that the sun has something to do with it which is not a
>>>"given".
>
> I should have said line of sight; Doppler normal to LOS is zero is it
> not?

It is not. Look up "transverse Doppler".

>>"Velocity line"? Why not say speed if it's "regardless of direction"?
>>Velocity doesn't just have more syllables, it has the added meaning of
>>direction. It's a vector. And the sun has everything to do with it - the
>>Pioneers are being decelerated by the Sun's gravity and by something
>>else.
>
> I think it's that "something else" that is very likely not affiliated
> with the sun.

The anomaly is the slight deviation from the
acceleration produced by the Sun and planets.

> I have half read the paper again and I saw the statement that when P10
> got the signal it amplified it and re scaled it and retransmitted it.
> I find that hard to believe, when it seems so much cleaner to trigger
> a local oscillator and get a clean primary signal back to earth. I
> believe it makes a big difference.
> I am continuing to investigate.

That's what they do, there is an on-board high
stability oscilator which can be phase-locked
to the uplink carrier. The PLL includes a fixed
ratio divider so that the downlink frequency is
exactly related to the uplink.

The text discusses the meaning of "phase coherent"
in the third paragraph of section 3.1, and there
is a more general description in section 2.4.

HTH
George


.

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