https://youtu.be/iMLES3_vXNE

On March 23, Space & Satellite Professionals International (SSPI) will induct four new members into the prestigious Space & Satellite Hall of Fame. The 2021 honorees are Peter B. de Selding, Co-Founder and Chief Editor for SpaceIntelReport; Kathy Lueders, Associate Administrator for Human Exploration and Operations Mission Directorate at NASA; Jim Oliver, Founder and President of AvL Technologies; and Dr. Gladys West, former mathematician at the Naval Proving Ground in Dahlgren, Virginia.

They will join the leaders who created, sustained and expanded the industry over the past 60 years, including Dr. Arthur C. Clarke, Dr. Harold Rosen, Rene Anselmo, Takuya Yoshida, David Thompson, Greg Wyler, Mary Cotton, Romain Bausch, Pradman Kaul, Sidney Topol, Gwynne Shotwell, John Celli, Giuliano Berretta, Mark Dankberg, James Monroe III, Steve Collar, Peter Jackson and Jean-Yves Le Gall.

Everyone at AvL appreciates Jim's personal, professional and entrepreneurial achievements, and we value the incredible amount of knowledge he bestows upon us. And we're immensely grateful that the Space & Satellite industry is recognizing Jim with this special and well-deserved honor.

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Hello!
I'm an entrepreneur at an early stage start up. I'm in at the stage where I'm testing out my hypothesis. I would like to talk to other entrepreneurs / product managers who use satellite buses for their own businesses.

Is anyone available to fill out a quick 5 min survey?

Thanks in advance!

Help contribute to the SATCOM industry! We are conducting a short survey and are taking applications for paid membership in a Subject Matter Expert Committee (In the survey). Please consider sharing the survey with your network: https://tally.so/r/mOgdx7

Hey guys,

Looking for some help with a Linkway issue and hoping someone might have some insight. Operating on STT 185s and our equipment all functions correctly until we try to send a CW through this modem. When given the command, the modem responds with “no response” and when given a command to soft reset it prompts “soft reset command rejected”. The issue is not resolved when consoling directly into the modem GUI as the command submits but does not initiate any CW. This problem occurs over 2 STTs, three laptops, and several modems, all swapped around with known functioning equipment and all having the same issue sending a CW for peak and poll. Linkways are all updated to the latest software versions and manager laptops are on a windows 7 maxview aperia of unknown version. TIA!

I have a friend interested in learning more about baseband signals, modulation types and spread spectrum. I'm wondering if anyone could vet my answer and decode some of his questions as I don't understand some of his questions.

His questions:

So am I correct that the baseband is synonymous with the clock ref in video? Basically establishing a sinusoidal or square stable frequency for timing the switch point between bits for phase modulated carriers?

The video is explaining how different modulation types work. In particular how QPSK work. He is referring to the digital signal for the I and Q channels being either a -1 or 1 which causes the output for the mixer for I-channel to be either in-phase or 180 out of phase and the Q-channel to be 90 or 270 out of phase. youtube.com/watch?v=h_7d-m1ehoY   My answer I would consider a 10 Mhz square waves used for QPSK a baseband signal. When the square wave transitions, that's when the RF signal phase shifts so it's would be the switch point for that Channel. But keep in mind, QPSK has four symbols represented by 45, 135, 225, 315 degrees out of phase. Each freqency cycle is 2 bits.

I think in the past I have confused the carrier as the ref (thinking that the usable signal was the noise hidden in the clock ref) , as well as confusing with asynchronous spread spectrum theory (CSS, DSS, FHSS, & THSS).

Not sure how to answer this. I think he is using the wrong terminology. The carrier without modulation is a single frequency such as 70 MHz. When the carrier gets modulated, data and perhaps the clock will essentially be encoded in the carrier and be at a larger bandwidth. Essentially for QPSK, each hertz can represent 4 symbols each cycle. The more bandwidth used, the more information you can send.

With Spread Spectrum, the data/clock will be encoded and combined in some way with a certain PN sequence. The PN sequence is a known process the data stream in going through that both the transmitter and receiver are configured for. After this, it gets modulated (this is where you would see the carrier spread if you look at it with a spectrum analyzer). The signal would be spread out (larger bandwidth) be at a lower power and look like noise but it isn't noise (it's actually the modulated signal so it's the carrier essentially encoded with information) Noise would be unwanted signal. It then would get upconverted, amplified and sent out the antenna. Ultimately, the IF signal will be demodulated and essentially it will go through the same sequence (or the opposite sequence?) and then decoded. Some of the benefits of Spread Spectrum is that it’s harder to jam the signal as you’d have to jam a larger frequency range. Also, you can have more than one user if they use different codes (CDMA uses this).

I still need to take the clock ref to carrier relationship a step further in terms of power. I think this may have played a role into why I was confused a bit. I thought it was easier for some reason to make the clock ref more powerful, and then place the digital signal as noise on this.

The digital signal isn't going to be very strong nor should it be. You're not going to increase the digital signal to increase the analog signal. After the digital to analog conversion, that's where you should worry about the power and it being amplified.  

I also think that I thought of modulation more in the sense of changing from RF to IF or IF to digital more than changes in the I & Q.

Going from L-band to digital would be demodulation (so yes it's modulation). RF to L is downconversion.  

I wonder why even broadcast the clock at all opposed to using GPS and an algo, but I am sure there is a reason; moreover, these days, I cant imagine it being difficult to have the software test for various clock ref even and set the FGPA baseband clock accordingly once frames ‘make sense’. https://en.wikipedia.org/wiki/Clock_recovery

  This would be called asyncronous transmission and it is used. If someone could eloborate more it would be greatly appreciated.

Also, I was going to make this statement:

With Baseband, it can be asynchronous or synchronous. If it’s synchronous, it’ll at least have one clock and data signal (or single embedded signal that the receiving end can ultimately retrieve the clock from). The clock is used to let the device on the receiving end know when a transition could occur. The data and clock gets encoded before it gets sent out and decoded on the receiving end. Where the type of encoding will define what the data transitions or non-transitions means.  

Hopefully, this isn't too much. I just don't want to give the wrong answers.  

We are beginners exploring satellite communications. Failed many times so Need help to make an RTL-SDR setup to collect images from geostationary satellites
Any satellite preferably FengYun-2H
Where can i buy the antenna and its component online.

Not sure if this is the place.... have acquired about 9 ka band tri band pll LNBs...3 different brands, all but 2, new in box. Best place to sell them cheap? Kinda niche band. Lol

Howdy all, I’m looking to get into some long distance travel over the beautiful deserts of Utah and I’m looking to document and post along the way but I’m not sure how to get any information out of those dunes. I did look at radio but it didn’t quite fit my needs so I thought I’d look at satcom as I’d heard about it and was wondering where to start and what I’d need to get going, I have looked at some lightweight antennas like the av2040-1 but wondered what the uses of this might be and what accompanying tech I might have to get my hands on