[Moon-net] 10GHz moon noise

[w2drz]

Hi,

If you have .95 db of moon noise the receiver looks to be ok,
 of course with the disclaimer of I don't know what I'm talking about.

On 10 GHz the big thing is doppler shift,
 it will be easily (+ or -) 20 khz depending on where the moon is.

Moon directly over head, or at your location due south or north will be
the least doppler near zero with the change over in doppler shift of +
to -.

if you have a tracking software package the shows the doppler that would
help in your attempt to hear your signal off the moon.

Also cross polarity from tx to rx can be a issue also. That's up to 20
db of loss in signal because of that in the worst case and does change
do to conditions to the moon and back.

If this is your first EME attempt you have selected a very unforgiving
frequency to start on (10 GHz).

With the issues as I show above and running 25 watts at the feed it is
do able with your 3.7 m dish if all is work very correctly as the margin
of error is small for it "work's or does not work".

Suggest to find when there are known others running on the moon and are
operating with them making contacts so you can look for them.


tom W2DRZ

Charlie Kahwagi wrote:
> 
> Hello everyone.
>                         I am slowly getting 10 GHz setup, but I am so far getting less than ideal results.
> At best so far,  I have 0.95dB moon noise  and  11 dB sun noise (SFU=81 @ 10.7cm)....for a 3.7M dish I think I have a lot of improvement to make.
> 
> I have reverted to a linear feed to help with optimisation.  My initial TX testing proved disappointing as I had 25 W at the feed but was unable to detect/ hear any echoes  with moon at Apogee and 0.8dB moon noise.
> 
> I have a question:
> 
> I have read that the amount of moon noise changes with the "phase of the moon"..........Is this correct?..........If  so what levels of variation exist?
> 
> Many Tnx
> Charlie
> VK3NX
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