truly great work!... not a failure at all.. its a start
@csparty119 күн бұрын
If you're using a phone, buy a cheap gimbal. That will improve on the steadyness. However if you really want to zoom and focus you need a decent camera something with an actuall lense.. You can also see the light is very bad. I hope you plan to bring out new video's about sat/mil reception. I was enjoying those. :-)
@seeker443017 күн бұрын
boring? i dont think anyone thinks that
@seeker443017 күн бұрын
what did you reduce the sampling rate to?
@REDACTED-THE-COOLEST22 күн бұрын
Sounds like an speed up morse code with eerie ambiance
@ErskineDavisАй бұрын
Very Informative. Thanks!
@WiegerBonwonderfulwbАй бұрын
Spotting with SDR would be interesting... And I'm asking myself.. does the grass mower have any SDR signal? So it is traceable for the tower?
@user-yy2nu1kw2wАй бұрын
For Those Who Don't know : In 1977, An Ohio Astronaut Were Looking In The Stars On The Sagittarius Continuation, But Suddenly He Heard An Sound Through The Radio Controls, Signaling to a Group Of Stars That Lasted A min And 12 Seconds, This is Called Wow! Signal, Scientists Or Astronauts Don't Know After 48 Years, Maybe We Know It Someday
@dereksgcАй бұрын
@@user-yy2nu1kw2w this is not true, nobody heard anything, there was no audio and the signal lasted a couple seconds
@user-yy2nu1kw2wАй бұрын
Bro, According To The Other KZfaqrs, Like Astrokobi, It Lasted 72 Seconds Not A Couple Seconds
@dereksgcАй бұрын
@@user-yy2nu1kw2w the 72 second window is a big stretch made to accommodate some other peaks in amplitude, the "6EQUJ" sequence lasted for about as long as you can see in this video
@ostrov11Ай бұрын
Лок’тар огар!
@youtubeaccount931Ай бұрын
based
@H-S.Ай бұрын
I lived in a city with a military air base for a while, and it never occurred to me that I could just... go there and watch... :D (Though it was not in my home country, so I guess I would have _really_ hard time explaining I'm not a spy if they came and asked.. :)) )
@jayerjavecАй бұрын
Spotting is addictive. Thanks for sharing.
@gonak55Ай бұрын
Aliens
@sbkarajanАй бұрын
What is needed to get ANY data from Juno? What would be the minimum diameter of antenna and other equipment and any rational for them? I am thinking any radio signal from Jupiter is impossible to get, because Jupiter is such a radio noisy planet. Am I about right? But I want to prove me wrong, so could you provide minimum specs to get the data from Juno or other planetary probes, and any calculation that can justify it? Are those equipment within reach for say, $10,000 budget?
@dereksgcАй бұрын
x.com/uhf_satcom/status/1429196861131329543
@sbkarajanАй бұрын
@@dereksgc Thank you so much! But how does he know if the signal is from Juno, not from some radio station or roque antenna nearby? Does he have any video or paper that explains how he validated his data?
@dereksgcАй бұрын
@@sbkarajan The signal frequency matches the Juno allocation, the signal Doppler shift matches the Doppler generated by the relative movement of the Earth and Jupiter plus Juno's own orbit, and most simply a visual confirmation as the dish antenna used for something like this is highly directional and Jupiter is quite a bright object, seen even in daylight if you use a telescope and know where to look (plus the az/el readings would match the current position of Jupiter)
@sbkarajanАй бұрын
@@dereksgc I want to believe you. So, what's the signal frequency of Juno & the doppler shift that's expected? And where do you get those numbers? (references?)
@sbkarajanАй бұрын
@@dereksgc For Juno, what would be the S/N ratio? -100 dB? -1,000 dB? -10,000 dB? Can it ever work in such situation?
@sbkarajanАй бұрын
Can you get any signal from Hubble telescope of James Webb telescope? What I am curious is, HST, the orbital period is like 90 minutes. For the earth bound telescopes, we have about 12 hour night sky. For HST, it's only 45 minutes and the sky is moving a lot faster for it. So what is the advantage of having the telescope in LEO? Anyhow, can you get the signal from HST or JWT please? If you can download any data from them, that will be even more great.
@dereksgcАй бұрын
I can not reach HST due to its orbital inclination, it never comes within view of central Europe. It should be possible for me to receive the JWST S-band telemetry beacon, but I believe its actual science data is transmitted way up higher and I do not have the hardware for that. The main advantage of space telescopes is the fact that they do not have to deal with the atmosphere. HST can have a 24/7 view of its target if it is aiming "up" or "down" relative to Earth's axis. The sky is also not moving for a space telescope, once you are in space you can lock your orientation relative to the galaxy and not be bound by earth's rotation, so it is actually easier for a space telescope to track an object in the sky than for a terrestrial one. But the Earth does provide an obstruction in some cases, I suppose in case of the HST low-Earth orbit was chosen for ease of access for maintenance with the Space Shuttle, whereas future telescopes (and even many of the current ones) are heading far above LEO
@sbkarajanАй бұрын
@@dereksgc Ok, but you heard of SOFIA, airborne telescopes? It can be anywhere, easier to maintain, out of most troposphere and I don’t think HST has much better advantage over it, other than HST being much more expensive.
@sbkarajanАй бұрын
@@dereksgc I think you know some science better than me, so let me ask you this. Do you remember John Glenn, the American hero astronaut? He claimed to have orbited the earth 3 times, meaning at the speed of 28,000 km/h around the Earth and then reentering to the earth that cooks the spacecraft with 3000 F heat. Take a look at his Friendship 7 craft in the Washington's Air and Space Museum. Do you think it went through earth reentry at 3000 F but its paints are intact? BTW, paint melts around 200-300 F.
@sbkarajanАй бұрын
@@dereksgc Compare Friendship 7, other Mercury, Gemini crafts with the real reentry capsules such as Soyuz and Shenzhoi. Even the bare aluminum Apollo and blow torched to look like it went through reentry. Bare aluminum melts at 1200 F.
@dereksgcАй бұрын
@@sbkarajan SOFIA and similar telescopes still operate inside the atmosphere, after all both planes and balloons rely on atmospheric pressure to stay aloft. Space telescopes are going to be a lot more consistent and capable. Hubble is also extremely old and outdated by any metric, by the time SOFIA was flying the technology has improved a lot, and you can see that with JWST now. So yes, you can match the HST today for a fraction of the cost, but it was the innovation and experience gained from HST and others that will lead to more advanced and capable space instruments in the future. If you think SOFIA was as capable as Hubble, which arguably it was in some ways, if it was positioned in LEO it would have been even more capable. About the space capsule, you need to consider the fact that basically every orbital reentry vehicle is equipped with a heat shield on the bottom side. You are correct in your statement that the materials used would melt at those temperatures; it is the job of the heat shield to make sure they never reach them. The heat shield is either ablative and slowly burns away during reentry (in a controlled manner) which is how it takes away the heat energy, or it is just made out of a very durable material that takes the heat. As the heat shield is a blunt surface exposed to the airflow, it forms a "cone" of plasma around the capsule where the high temperature is concentrated, while the trailing surfaces stay relatively cold. If something was to go wrong with the control of the capsule and wrong surfaces (like the painted ones) were exposed to the superheated plasma on the front, you would then be looking at disintegration. There have unfortunately been cases of spacecraft burning up during reentry due to a problem with the heat shield, such as space shuttle Colombia.
@salehabualasalАй бұрын
TY .. very informative
@GnosticElohimАй бұрын
Your calculator doesn't work, it doesn't do anything at all.
@dereksgcАй бұрын
sounds like a problem with your browser, if you are on a computer try pressing the enter button after you are done inputting the values, on a phone you should have a confirm/enter button on the keyboard as well, it was tested over multiple browsers and platforms and auto-updating worked
@FELDCORPАй бұрын
Do you have the stl for the LNB mount? You can see the grey one @3:38 I tried finding on your thingiverse but didnt see it
@CocolinoFanАй бұрын
This is great, and the antenna calculator is really nice! Thank you so much! I just don't understand how does this relate to the dish. I know how to make a helical antenna, but where do I place it in the dish, how do I calculate the position, number of turns in the antenna, etc. given a dish I have.
@dereksgcАй бұрын
you place it with the first (bottom) turn roughly where the entrance of the LNB would be, for standard offset dishes you want around 60-70 degrees beamwidth, for prime focus dishes helical antennas aren't ideal but if you want to use one you need a wider beam such as 90-100
@CocolinoFanАй бұрын
@@dereksgc Thank you so much I understand now. I will get images from the Metop satellite even if is the last thing I do!
@BlackVelvet446Ай бұрын
At what frequency do those walkie-talkies that are heard via satellite broadcast?
@BalticLabАй бұрын
8:52 Did you just call me nobody? 🧐😂Good idea though, there seems to be little to no "entry level" information and particularly nothing useful on YT. I'll put it on my list. 12:24 The Diameter of a Dielectric Resonator is roughly the speed of light divided by [the desired frequency times the square root of the relative permittivity of the material used]. The material is usually some barium and titanium oxide. At the resonance frequency, the electric field moves in circles inside the resonator, like being stuck in a roundabout. This is called the TE01δ (say: TE 01 delta) mode. The little striplines next to it are used to couple some of the oscillator's signal into the "roundabout" and the other stripline is used to couple some of the signal in the roundabout back into the amplifier, thus closing the loop (and fullfilling the Barkhausen stability criterion). The dielectric resonator is usually positioned 1/4th of a wavelength away from the end of a microstripline as the E-field has a maximum peak there. If you see one microstripline being longer than the other, one is simply 1/2 wavelength (or multiples of 1/2) longer than 1/4th wavelength. Which changes nothing from an impedance and field strength standpoint, but reduces direct coupling from one microstrip into the other. This roundabout effekt of the TE01δ mode only works at the correct resonance frequency. The reason why they can be tuned with metallic objects, such as screw, is, because there also is a magnetic field influencing the flow of traffic in the roundabout. Changing the permeability by disturbing the H-field will shift the resonance frequency.
@cengiz_ioАй бұрын
16:55 casually flexes a 2.5m dish holy crap
@joefish6091Ай бұрын
Remember there are collaborating receiving stations all across the globe. and the signal can be received anywhere within the footprint.
@dereksgcАй бұрын
There's currently just one in svalbard
@sergeymatyushenko5940Ай бұрын
Hello Friend. Thank you, you helped me a lot. Ukraine will be free. Putin is a bastard.
@Sentrybot743Ай бұрын
why is wow signal overly quite scary
@JensOlsson-f5cАй бұрын
That list of satellites, where is the source of it ?
@rubenverandiАй бұрын
Hola amigo, gracias por el video, me sirvió mucho. Quiero saber como debo configurar el SdrSharp. gracias 73 LU9ERV
Ай бұрын
👍
Ай бұрын
👍
@levisorenson7873Ай бұрын
Your channel is super underrated.
@akhmadferdinandlubis24122 ай бұрын
IMHO you should point the C LNB as same as that helix antenna direction, facing the offset focus of dish.
@sbkarajan2 ай бұрын
Theoretically, how far your signal can travel to? Alpha Centauri? Zeta Reticuli? Sirius? The other end of the Milky Way? What’s the equation and numbers to use for that?
@Wildlandfirefighting2 ай бұрын
Thank you, this was a very informative and interesting video
@Wildlandfirefighting2 ай бұрын
Hi Derek, thanks for all the super interesting videos, you have inspired me to start experimenting with satellite reception, it would be interesting if you could do a series on some of the different satellites that have interesting downlinks available to receive, what they transmit and how to receive them, maybe starting with geostationary satellites
@eswnl12 ай бұрын
50dB is pretty high gain.
@papfust2 ай бұрын
Do you think that the WiFi grid antenna can access GOES Sat from London UK?
@dereksgc2 ай бұрын
Check with an app like look4sat or gpredict to see if you have line of sight, you need a clear view of the satellite with no obstructions. I don't think the 2.4 GHz grid antenna would work on its own, you would probably have to modify it so its properly tuned at 1.7 GHz
@itrstt662 ай бұрын
can you get like military intel typehigh quality zoomed in images?
@dereksgc2 ай бұрын
no
@user-et2cc7he5z2 ай бұрын
Thank You for all your great videos and knowledge , more videos please…Great English… My experiences range from : NOAA APT , HRIT , GVAR and now GOES GRB. Best wishes from Colorado , USA..
@medicalstudioimt30312 ай бұрын
I can't understand how GPS sats appeared on 2,2GHz.
@mykdelta2 ай бұрын
One of the most 'effective' tutorials I've seen on YT. Straight to the point, no lengthy bla bla and heaps of information. Info is the right mix between practical en theoretical info. Really well done.
@SheksgemWhepdo2 ай бұрын
Can a normal TV antenna work fine?
@andrejapolenik86062 ай бұрын
I'm sure you're from sk/cz xdd
@user-gn9mk4ge2b2 ай бұрын
nice, russia comes to the rescue, when all lrpt seems lost.
@MaksimSSM2 ай бұрын
Are you ucrainian n-zi?
@WiegerBonwonderfulwb2 ай бұрын
8:03 Love you do it yourselfing 🙂
@adamkekow65582 ай бұрын
34:32 rat race coupler used as balun.
@AppliedCryogenics2 ай бұрын
I had to take apart some 5G prototype hardware (LTE picocell) for a job back around 2010, and it had anti-tamper features: A battery-backed up RAM with the encryption keys and subscriber information, and a thin wire, embedded into both halves of the plastic case, connected the two. It was like a spider's web. I was warned of this situation so was able to find and bypass wire before opening. :D
@80lab382 ай бұрын
I would guess that the SOIC-8 packge next to the PA is just a run-of-the-mill P-FET that switches the power to the PA. Pins 1-3 and 4-8 are shorted together, and hat big heap of caps right next to it also points in that direction.