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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1answer
650 views

Doppler Shift Compensation in Inter Satellite Communication

I am currently doing a project in the area of optical inter-satellite communication (GEO-LEO). I am using a optical carrier of 281 THz, and the Doppler shift corresponding to it is ±7 GHz. I ...
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1answer
275 views

Are there any satellites in UHF that do not use AX.25? Which of them are in working state? Is the communication to them open?

I have a custom digital transceiver and will like to communicate with digital satellites in the UHF band. It might be fun to try different protocols other than commonly used (like AX.25) as well!
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Which Frequency Band(VHF/UHF) is most useful for satellite in MEO?

I want to get to know about the satellite communication at 8000-10000 km, During that, I come across the VHF and UHF. In that I am facing problem for deciding the frequency band for communicating with ...
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574 views

Autoranging problem for AX5043 transceiver (437.025MHz)

I am trying to configure AX5043 transceiver(ONSEMI) for PSK modulation and system parameters are as follows: ...
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2answers
113 views

Is there somewhere I can get a database of satellite catalog IDs and their friendly names?

I'm working on a program for ham radio that involves displaying satellites. I'm currently using the Space-track.org database, but the problem with it is that it will give "Saudisat 1C" rather than SO-...
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1answer
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Command-line satellite tracking software

Is there any software similar to Gpredict but which can be used without a GUI and can control rotor Az/EL and radio doppler shift? I'm using Linux in particular, especially Ubuntu 14.04. Currently, I ...
2
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1answer
198 views

Is there an audio feature for Gpredict?

I am trying to learn about how to talk to satellites and the ARISS via ham radio. What I am wondering is if there is an audio feature I can access for the azimuth. In the sun, I cannot really see the ...
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1answer
140 views

Can one modify footprints in Gpredict?

I have created a TLE to represent my theoretical satellite whose orbit I wish to plot using Gpredict. I have managed to load it all up onto the program and it is looking good, but one thing remains - ...
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2answers
1k views

cubesat turnstile antenna material selection

My cubesat team is working on our design for rolled whip antennas to deploy in a UHF turnstile configuration based on this design: What I would like advice on is the material for the antennas ...
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1answer
624 views

How to bypass LNA for TX in UHF Antenna?

I want to work with amateur, low power, and/or pico satellites. I would like to use an Eggbeater or Turnstile antenna with my UHF 433 MHz radio, since those antennas are very cheap and easy to build ...
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710 views

GFSK Demodulationsoftware

I need to demodulate and decode a signal.It is transmitted from a satellite using GFSK. The packets are based on AX.25. Could you recommend any out-of-the-box HAM software packages that could do ...
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2answers
204 views

SkyStar S2 has a mac address, for what? [closed]

Hy just a "stupid" question, I bought a technisat skystar s2 pci card. Can any body tell me why this thing has a mac address printed on it? ^^ And the mac address can even been looked up. (00-08-c9-xx-...
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391 views
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981 views

AFSK and GMSK in ICOM IC910 H

I am a newbie in HAM.The transceiver I have in my lab is ICOM IC910 H. My goal is to use it to communicate with our cubesat which uses GMSK. According to the manual, on page 50, there are notes for ...
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1answer
179 views

What are the legal requirements for an amateur radio satellite?

Lets say I can throw a satellite into orbit (I've got a good arm). I'm amateur radio qualified so can I just set it up to transmit on an amateur band and start having fun? Is there anyone I have to ...
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1answer
108 views

ISS SSTV transmission times

Unfortunately, the ISS SSTV transmissions scheduled to the next weekend had to be canceled. Anyway, I'm planning to capture some images and have a doubt. I've been trying to find some answers, but no ...
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2answers
200 views

Ettus USRP1 (or B100) instead of Funcube Dongle

Is it possible to use an Ettus USRP1 (or B100) instead of Funcube Dongle to receive cubesat signals? The Ettus ones are more expensive.
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177 views

Low cost satellite (cubesat) tracking station

To track and receive some data from satellites, or should I say cubesats - which are kind of popular these days, which is the minimum investment? What's cheapest/easiest satellite to begin with? ...
3
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1answer
585 views

What determines the optimum frequency range for the transmission of signals?

What determines the optimum frequency range for the transmission of signals in a system that's transmitting electromagnetic signals between an antenna on the surface of the earth and an orbiting ...
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1answer
147 views

Track cubesat with webSDR, is is feasible?

WebSDR is a Software-Defined Radio receiver connected to the internet. Here is being said "OK for HF but no good for VHF / UHF". I was thinking to use it for cubesat reception but given that the ...
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1answer
104 views

FUNcube Dongle antenna specs

What are the specs of the FUNcube Dongle antenna? I mean, how to fully describe only the antenna?
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369 views

Weather Imaging with NOAA satellites - legal?

I would like to build an antenna for receiving NOAA weather satellites. They're receivable at around 137.5 Mhz. I'm a total new to amateur radio stuff. I know that it's not legal to communicate as ...
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1answer
78 views

Directional antenna for FUNcube reception

Will a directional antenna guarantee longer reception periods then a standard antenna? May I ask for the specs for one of this directional antennas to use with RTL-SDR?
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2answers
1k views

Why can I barely hear the SO-50 satellite?

I have a Kenwood TM-V71A dual-band radio that I have attempted to use to listen to the FM repeater on the SO-50 satellite. I'm using a home-made dual-band yagi antenna made out of coat hangers, that I ...
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1answer
161 views

How much RF power should I expect to receive from a satellite?

I am trying to receive beacon from the analog satellites and observe its power on signal analyzer.I am using a 15dB gain and LNA with a 40dB gain. I am trying satellites like Ho-68(-81.64 dB at 56 deg ...
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0answers
111 views

Transmitting to and from low earth orbit? [duplicate]

I'm a hobbyist and I'm currently thinking about building a CubeSat. I'm currently designing PCBs, casing, etc. I was wondering what variables are involved with sending data to and from 250 km - 350 km ...
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183 views

Identifying signals in the satellite exclusive band

I have just started playing with SDR so I downloaded the relevant amateur band plan for my location, the UK. Tuning around I found things like POCSAG/FLEX pagers as expected and amateur radio (e.g. ...
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3answers
761 views

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?
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266 views

Why do satellites receive and transmit on different bands?

Most satellites I've found transmit on VHF and receive on UHF or vice versa. Why is this? I would think there's enough space on a single band.
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1answer
286 views

For Linear Transponder satellites, do I transmit on USB or LSB?

I'm in charge of our Field Day satellite communication, and I'm going to try and do this via SSB on one of the SSB satellites. I know they invert the signal, but is the convention to transmit on USB ...
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1answer
185 views

What is the largest amateur satellite in orbit through 2014?

What is the largest, and what were the dimensions of the largest amateur radio designated satellite in Earth orbit as of, or up until, 2014 other than the International space station.
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221 views

What will I need to receive the ICE/ISEE-3 transmitter?

The ICE/ISEE-3 spacecraft, launched in 1979, is due to pass by the earth in August, 2014. It was commanded to power down completely years ago, but it appears to have failed to do so, and while it ...
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1answer
96 views

Transmitting Offset for sats

I found some pages on info for satellites, and I got different results. Some said to shift the transmit frequency as well as the receive, some said to keep the transmit the same, but shift the receive ...
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1answer
376 views

Where to find All Space Station Frequencies?

I am trying to make a list of all ISS downlink/uplink frequencies including ham bands and non-ham bands for a net I just started up, the Amateur Satellite net. Where can I find all of this? I can ...
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2answers
312 views

How far from earth do FCC regulations apply?

So, I know people in the space station need a HAM radio license for operation. How Far exactly from earth do you have to be to transmit any RF wave you want without a license?
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3answers
130 views

Why do satellite tracking programs have to be updated?

So I've heard every once and a while you have to update your satellite tracking software because of the fact that the satellites are falling towards Earth. Why can't the program automatically ...
8
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2answers
359 views

Have hams ever used (clusters of) geostationary satellites as passive microwave reflectors?

A number of geostationary satellites are quite large and/or appear in clusters. Moreover, many of them have large reflectors pointing to Earth (e.g. satellite TV sats). Finally, these satellites are ...
5
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2answers
80 views

Website for Sat details

I used to use the Amsat website for finding out the status of Sats and other info, like operating frequency etc. It was proving useful, and I like the pass predictor also. Seems nowadays though there'...
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1answer
944 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
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1answer
212 views

How to talk to the ISS

I have a UHF/VHF transceiver capable of transmitting on UHF and receiving on VHF or vice versa on channel mode. I finally got a directional Yagi antenna so reception/transmission shouldn't be a ...

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