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Questions tagged [satellites]

Amateur radio satellites refer to any artificial object in Earth orbit that are useful for amateur radio purposes.

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8 votes
3 answers
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What gain do I need to talk to SO-50 with my HT?

My HT has 5 W of power, a sensitivity of about 0.2 µV, and I would like to talk to the SO-50 with it. How much gain do I need in my antenna to make this work?
PearsonArtPhoto's user avatar
3 votes
2 answers
1k views

What is Circular Polarization?

So I just learned that a satellite does not send out a circularly polarized signal, it just switches orientation slowly when it topples through space. I thought that because they were spinning, the ...
Skyler 440's user avatar
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23 votes
3 answers
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Can I build a radio telescope out of a parabolic TV satellite dish?

I have the possibility to buy a very inexpensive 2.4m parabolic satellite dish and I would like to build a radio telescope from it. Originally this dish was designed to be a satellite TV antenna. ...
SP5RFD's user avatar
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9 votes
2 answers
3k views

Are satellites Left or Right hand circularly polarized?

I'm thinking of building some helical antennas for satellite work. I want to know which way to wind them. If satellites are spinning randomly, how can we know if they are left hand or right hand ...
Skyler 440's user avatar
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7 votes
3 answers
1k views

Store-and-forward capable satellites in operation?

The amateur satellite community used to have a small fleet of pacsat satellites (AO-16 and friends), which were capable of store-and-forward message passing: you could upload messages to the LEO ...
oh7lzb's user avatar
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6 votes
1 answer
217 views

Has an amateur radio communication ever taken a path outside the Earth-Moon system?

As a bit of curiosity, I was wondering what the longest path ever used by amateur radio operators has been. Of course the opposite side of the Earth is no problem with a good HF station. And you can ...
Phil Frost - W8II's user avatar
6 votes
1 answer
1k views

What is spin fading in satellite signals?

Why do signals from satellites experience "spin fading" as the satellite rotates? What are the effects that spin fading has on a radio signal? From test question: T8B09
JC Hulce's user avatar
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6 votes
2 answers
3k views

doppler LEO satellite

I am trying to model Doppler shift of LEO satellite, From my research so far I have come across the following formula: \begin{equation} \frac{f_r}{f_s}=\frac{1-\frac{u}{c}cos\theta}{\sqrt{1-\frac{u^2}...
Rizias's user avatar
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3 votes
4 answers
327 views

Can sub GHZ frequency can be used in space communciation?

Is it possible for a sub GHZ frequency (Say 300 Mhz) can be used for space communication for small satellites such as a cubesat? What are the advantages and disadvantages for this.
Sujay sreedhar's user avatar
2 votes
2 answers
434 views

Replace directional antenna by fixed antenna

Given the following specs of a directional antenna: ...
KcFnMi's user avatar
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1 vote
1 answer
402 views

Double Cross Dipole antenna for 437 MHz don't tune

I'm building a Double Cross Dipole antenna for 437 MHz to be used with a SDR receiver for CW cubesat. The idea is to follow this "classic" paper from Gerald Martes, KD6JDJ. I tuned every single dipole ...
Carlo IU2KQB's user avatar