Questions tagged [satellite]

Circuit design for satellites differs because of the space environment, which includes designating for vacuum, large temperature swings, and radiation tolerance. Satellite circuits should be able to handle latch ups and Single Event Upsets (SEU's) from radiation that ionizes silicon channels and recover from faults.

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Does Sirius XM satellite radio use amplitude, frequency or phase modulation? [duplicate]

Or a combination of the three at the same time? Is that possible or desirable? Do digital and/or satellite radio broadcasters use a carrier wave modulated by a lower frequency input wave, like ...
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55 views

Where would be the best place to start looking for information on developing a bootloader using 2 microcontrollers for a CubeSat?

I am an engineering student who has just begun working on a CubeSat project for my design class. We are working on the OBC, specifically looking at developing a bootloader at this time. The OBC ...
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16 views

How can I connect IDU (indoor unit of VSAT) modem to a IP based audio video camera which supports connection by wifi?

Basically IDU modem consist of a ethernet port where earlier I had connected a video modem with a old video camera (with no audio). But I want to replace it with a IP bases video camera which has ...
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100 views

Help with calculating frequency offset

A 10 MHz TXCO is driving a receiver’s front end and has a frequency deviation of 10 ppm. It drives a direct downconversion RF front-end mixing the L5 frequency. What is the frequency offset at ...
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1answer
78 views

Does satellite radio use AM or FM or both? [closed]

Somehow, I cannot find an answer anywhere... I am guessing both... Several actual satellites had FM in their names, so perhaps that is a clue, but I want to know for sure...
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52 views

How does being exposed to strong radiations effect nanosatellite electronics equipment?

I'm on paper designing a nanosatellite power system. The satellite would be orbiting in LEO. And I am wondering how and what type of radiation would affect its electronics. The system has a ...
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27 views

Typical rms values for random jitter in satellite communication

I'm trying to find typical values for random jitter in satellite communication and I'm not really finding any values in any documents. Most of the time I only find definitions for different jitter ...
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4answers
79 views

Is building a long range wifi antenna to connect to the up and coming starlink internet possible? [closed]

I want to try to convert a residential satellite dish into a long range wifi antenna to theoretically see if I can connect to the up & coming starlink internet that is being released in Canada and ...
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49 views

Antenna Array - Hundreds of elements forming thousands of beams - How?

How would an antenna array of 100 elements be able to form 5000+ simultaneous beams? Or do I have it wrong, there would only be a maximum 100 beams from the 100 elements at any one time and those ...
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55 views

Troubleshooting NOAA double cross antenna

I've been trying to recive NOAA automatic picture transmission (APT) pictures for a year now. I never got a picture with V-dipole, so I decided to build a double cross antenna. I used 75 ohm coax ...
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2answers
200 views

How do I move a motor to a desired angle using a motor encoder?

So I have this project, the goal is basically to be able to make a motor move to rotate a set of gears and move a panel attached to a hinge to a desired angle. I have a motor encoder attached to the ...
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65 views

How does satellite TV get through in rain?

How does satellite TV get through in rain? I read somewhere that satellites make use of KU band to transmit data, we have heavy rainfall in various times of the year but even during those times TV ...
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49 views

Satellite array antenna beamforming - basic intuition help

When you see a satellite coverage region on the earth, the array antennas form tens of circles (small coverages) in a large coverage. My question is whether all these small circle coverages exist at ...
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27 views

Does DiSEqC require a DC bias?

The DiSEqC (Di[gital] S[attelite] Eq[uipment] C[ontrol] specification (bus_spec.pdf within https://www.eutelsat.com/files/PDF/DiSEqC-documentation.zip) describes a tone-based serial data bus that can ...
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1answer
57 views

Radiofrequency exposure from portable (vehicle-mounted) satellite uplink antennas

I came across these broadcasting vans recently in London. The antenna that's deployed I think is a Vislink Advent uplink antenna, similar to this model, designed to transmit to satellites for ...
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114 views

Do you really need a satellite dish to communicate with satellites?

I'm doing a project where I have ground sensors that detect seismic activity and report their GPS coordinates via APRS if seismic activity is detected. I'd like to do the APRS over satellite. The ...
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106 views

Can anyone explain Phantom Power and, specifically, how it's used in satellite television systems?

Although I spent many years in the electrical field, I specialized in Electrical Metrology (a long time ago). Bearing this in mind, I really know very little about satellite television system theory. ...
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50 views

Source generator for Satellite Tuner input

I need to design a source generator for a TV factory. They want to automatize the functional tests by applying a test module to the TV's at the end of the production line. All the peripherals of the ...
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326 views

Current limiting solution for pocketqube satellite

A project I am working on requires a reliable current limiting solution for a pocketqube picosatellite. Currently a Texas TPS2553 is being employed which will cut power once the limit is hit. We are ...