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

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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. ...
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2answers
103 views

Doppler shift compensation without using predictive modelling

Doppler shift mitigation has been studied extensively in the literature. In my implementations of satellite receivers (using GNU Radio), I use predicted Doppler shift from a software (GPredict) to ...
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2answers
115 views

What wireless communication technologies can travel long distances with a high bandwidth?

I couldn’t find a better place to ask this question, so I have asked it here. I am looking to transmit and receive internet connectivity wirelessly over a distance of 6 miles (9.7 km) with a minimum ...
3
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1answer
82 views

What is the turn spacing on a Helix Antenna?

I want to do some satellite communication so I thought why not build my own helix antenna. I found this page: Helix antenna design and construction details The most things are clear except for the ...
4
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2answers
142 views

I would like to listen to a red roadster in space

I have been listening for signals (any) of the Space-X Falcon Heavy. Just out of curiosity. And I am wondering if anyone has received any. According to the Falcon-9 User Guide table 4.6 looks like ...
3
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4answers
147 views

Who regulates ham radio satellites?

I have doubts regarding the control authority of the amateur radio satellites, because recently we have drastic changes to Internet control by FCC as the next major decentralized communication system ...
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1answer
113 views

What happened to AMSAT-Phase 3E?

The web pages related to the unlaunched satellite were last updated in 2007, so I wonder - where is it now? Is it going to be launched someday?
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3answers
170 views

Would the antenna described work?

For reception of amateur radio satellites, turnstile antennas (consisting of two crossed dipoles fed out-of-phase) are often used. I've recently had an idea - what if two half-wavelength dipoles are ...
4
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2answers
399 views

How to transmit images and video through a hurricane?

Background You're in the path of a hurricane, and the eye just passed over your head. There is no electricity (apart from your own generator or battery), there is no mobile network and there is ...
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1answer
119 views

Could UHF Earth-Satellite-Earth bouncing of signals off of this large metallized foil satellite be feasible?

The July 14, 2017 NASA Spaceflight article Soyuz 2-1A launches with Kanopus-V-IK and over 70 satellites says: Mayak is a three-unit CubeSat which was built by Tvoii Sektor Kosmosa – or “Your Sector ...
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2answers
464 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}...
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2answers
468 views

APRS digi path for ISS digipeater?

So when I try to work the ISS digipeater, what should I set the digi path to be? My setup is a 5 W HT with a 2 m yagi connected to my phone with APRSDroid. I've tried the past few nights with ...
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2answers
74 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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0answers
326 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: ...
1
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1answer
69 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
523 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 ...
4
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1answer
391 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 ...
2
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2answers
180 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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1answer
147 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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2answers
434 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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1answer
527 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
91 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 ...
6
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2answers
271 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 ...
2
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1answer
84 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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2answers
226 views

Replace directional antenna by fixed antenna

Given the following specs of a directional antenna: ...
2
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2answers
158 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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1answer
61 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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1answer
126 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 ...
3
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1answer
164 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
188 views

Warbler vs SoundModem

I'm trying to decode a BPSK 1200 (with no success). In this endeavor I tried both SoundModem and Warbler. The scenario here is the following: Ettus receiver + HDSDR with speaker plugged into mic via ...
2
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2answers
326 views

BPSK raw data aquisition with HDSDR and FLDIGI

I was playing with HDSDR+ExtIO and Ettus USRP1 to track a BPSK signal. In the end I successfully heard the signal. But I would like to see the data, I mean the raw data (HEX values). For that I tried ...
2
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2answers
496 views

Website for satellite down/uplink frequncies and live footprint?

I am looking for a website that has the satellite footprint as well as the downlink freq. I just got a 2m/70cm handheld and want to see what I can pick up.
3
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2answers
791 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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2answers
1k views

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 ...
2
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1answer
136 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 ...
6
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2answers
434 views

Can there be (long range) propagation of HF from satellites?

HF transmissions from the ground can be reflected by the ionosphere leading to very long distance propagation. Satellites in low Earth orbit (160 km to 2,000 km) fly within the ionosphere (60 km to ...
4
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1answer
964 views

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 ...
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1answer
469 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 ...
3
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1answer
121 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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1answer
183 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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2answers
320 views

Are there any satellites with 435 MHz uplink?

I have a transceiver working in the 435 MHz ham band. I want to test my uplink capability by communicating with satellites operating in this band. Are there any digital satellites which I can use for ...
3
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4answers
265 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.
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0answers
105 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 ...
6
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2answers
148 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. ...
5
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1answer
529 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 ...
3
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1answer
221 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 ...
3
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1answer
150 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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2answers
652 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 ...
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2answers
216 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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2answers
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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 ...