DSLWP-B Queqiao (Lunar orbiter)

S

s-band

Member
My Satellite Setup
1.5m IRTE PF, Invacom SNF-031, TBS6983,
Various L, S, C, X & Ka bits. 1.2m S/X/Ku/Ka Prodelin on Az-El (being refurbished), 1.8m Precision PF with Bullseye Ku LNB or various C & X bits
My Location
Essex
Hi S-band. Very nice.
You mean you just aim dish at moon, then listen? Or do need to track moon, possibly even compensating for lunar orbit?
 
st1 said:
Hi S-band. Very nice.
You mean you just aim dish at moon, then listen? Or do need to track moon, possibly even compensating for lunar orbit?
Click to expand...
Basically, yes. The 3 dB beam width, at 2.3GHz is around 7.5 degrees so it's not critical. Manual tracking works OK as it only needs to be tweaked every few minutes. The 1.2 on az-el with the RC2000 is OK but count slip can be a pain above 7GHz. I don't think that the lunar orbit would not be noticeable until you have a huge dish.
 
The moon as observed from the earth is around 0.5 degrees of arc. The 'halo' orbit of the relay satellite has a diameter of the moon plus around 200kms which really won't change a thing at the frequency used.
 
Here's the beacon for Queqiao, the Lunar relay for the Chang'e 4 mission. It's a bit stronger than DSLWP-B.
Plot 250Hz/div. Slope is doppler change, wobble is the poor reference in the Pluto SDR.

@Mods, please add "Queqiao" to thread title.

Queqiao_2.webp
 
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