# Thread: Degree of Doppler shift for lunar tracking

1. Established Member
Join Date
Oct 2002
Posts
177

I want to make the point in my book that the different Doppler effects at different points on Earth were proof there was no 'phantom relay' satellite out in space sending a faked signal. The signal would have to be faked so it has different Doppler at different reception sites, which is impossible.

The velocities involved would be Earth rotation rate (1500 km/hr at equator) and lunar orbit rate (5000 km/hour, either positive or negative depending on setting or rising).

For S-band, say 2300 MHz, how big would the frequency shift be for a 6500 km/hour (say, 2 km/sec) closing rate?

2. Established Member
Join Date
Jul 2002
Posts
517
It would be pretty small. For such a non-relativistic speed, it would be approximately:
<u>__2 km/s_____</u> * 2,300 MHz * 2= ~.3 MHz
300,000 km/s

<font size=-1>[ This Message was edited by: Zathras on 2002-12-12 16:58 ]</font>

<font size=-1>[ This Message was edited by: Zathras on 2002-12-12 17:01 ]</font>

3. You ought to contact Mike Dinn in Australia. I'm sure he could give you the answers.

http://www.parkes.atnf.csiro.au/apollo11/

http://users.bigpond.net.au/eagle33/places/hsk.htm

http://www.tip.net.au/~mdinn/TheDish/

4. Established Member
Join Date
Oct 2002
Posts
177

Mike Dinn was my first choice, too, but he says his sources and his notebooks are out of reach right now.

5. Tom
Established Member
Join Date
Oct 2001
Posts
186
Googling for "EME doppler" turns up a multitude of sites, mostly dealing with programs that calculate doppler for amateur radio frequency correction. Here's a couple I found on a quick search:

http://www.qsl.net/pa0ply/eme2.htm

http://www.n1bug.net/prop/eme.html

searching for "EME" or "moonbounce" should eventually provide you with enough info. IIRC, the ARRL publication, "The Radio Amateur's Satellite Handbook
" ( http://www.arrl.org/catalog/?categor...ellites&words= )has a section dealing with the Moon.

6. Guest
<a name="2-12-14.mh2"> page= 2-12-14.mh2 aka 5:51 A.M. still Mh
On 2002-12-14 08:27, Tom wrote: to! 5:52 A.M.
1 hmm ? interesting ? HMM?
3

<a name="2-12-14.Lnk"> line= 2-12-14.Lnk
7
the link should take you to a doppler
and from there YOU SHOULD be able

7. Guest
<a name="2-12-14.Ri0"> page= 2-12-14.Ri0 aka RADi0
On 2002-12-14 08:50, HUb' wrote: To: HUb'
1 reCALL? it was E.C. Snyder that explained
to me that while he was at Menlo With Edison
3 the main reason he left was Radio
Edison did not believe in Radio at the TIME
{at least for now}(maybe 4ever)?
7 so the eye to eye was (T.E.)no /{E.C.S} yes/ Me?
I do not know {my standard replies time to vote No}
heres my logic I did go to thak this test
for 2 meters {Money} so sure I did buy FSR
2 for 20 as I recall it was advertised 4TWO miles Range
I get 2 blocks or ten bucks/block now i see 5 advertized
But U&I {no} its just **. MORE Jk. Under enforcement by.. Now on with My plan 4Ag

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