Відео

Always a great gathering of extremely smart guys and gals! I enjoy it immensely and hope to gather sufficient speed and info to be able to contribute!

Thanks Whit for your excellent briefing. As in all of your research, the passion and technical skills you share are clearly evident. Cheers, Paul M

Jerry, I suggest you consider building one of the Faraday Fabric lined Photo Umbrella Antennas. Their performance is excellent and are easy to fabricate Regards, Alex ua-cam.com/video/ymclkNnCeCc/v-deo.html

Sorry to hear about your kidney stones, Jason. Been there, done that. OOuuuuuuuucccccccchhhhhhhh!

Check out the New SARA video: ua-cam.com/video/QUY5AhAoyqY/v-deo.html

What can beginner like me do with radio astronomy and how to make a radio telescope?!

Thank you! Great

Hey folks, will the slides be up on the SARA website? I only see the older intro materials there?

great presentation I've been wanting to learn more about radio astronomy and excited to see there's a group of folks out there wanting to learn and share

Excellent presentation. Thank you for this

I'm also a radio amateur but with no experience of radio astronomy. Done some Exoplanet data processing but just using MicroObservatory data. Just stumbled across your excellent presentation but any hints on where to do some beginners reading on the subject ?

Interesting. I have been intending to spend time involved in radio astronomy which is essentially what's being demostrated here & hope to with my RS 918 this spring. I am curious regarding your loop receiving antenna and if you could give me a little abstract of what its configuration is including transformer at the feed point I'd appreciate that. Thanks, Kc2wvb

Thanks, Wolfgang ... interesting topic and clear explanations

The temperature dropped 5-10 degrees F during the eclipse. That could explain the baseline shift.

This video provides great encouragement for those who are curious...

Very nice presentation Andy!

Saludos desde Mendoza, Argentina @migos de SARA...

🎉

Hey!! Thank you so much for the fantastic and in depth video!! I am at the beginning stages and will be making many returns to this post

Science Asylum did a video about building a cloud chamber 8 months ago. There are also others on UA-cam, but I have not watched any of those.

Faraday Fabric : I have used Rejopfad Faraday Fabric Nickel Copper Faraday Cloth Kit, 44 x 39Inch Conductive Material + Faraday Tape(65FT x 0.5Inch) ( Amazon ) Alex

17:55 because physics deliberately broken. Everyone is taught bs, and are now locked in and cant think out of the box.

But better guestion, how much of the "sapce weather" is actually man made. A lot, is my guess. A lot. All I see is excuses so that they/them/reps can keep zapping us with F|AART antennas

Hai amateurs. Any known home made shield for humans? Currently constant C class solar x-flare. Tin house? :) Nasty stuff to be extremely sensitive. Others are too, the are just not aware. And they are not buying it. So trick i used, i say i'm psychic and i know when they felt bad. :D "omg, yes" "evil souls... I see dark energy... Here is space weather map. You are so gullable."

Use the Y-factor method to get better results (or liquid nitrogen)

Has anyone tried squares instead of discs in the yagi design? The manufacturing costs would, I think, be much lower.

Yes! Thats the kind of way of presenting that keeps the average person interested all the way, thank you!

Thanks for the effort. In the equations at 41:40, did we assume that the mass inside radius R is increasing linearly until R0? More mass density near the center makes sense but i couldnt see any reason for linearity at first glance.

Fantastic collaboration of dedicated scientists! Keep up the good works!

Yagi Antenna Theory " Words of the Week " Slow Wave Structures Artificial Dielectrics lea.hamradio.si/~s53mv/cigar/sws.html Cigar Antenna History lea.hamradio.si/~s53mv/cigar/cigar.html Cigar Antenna Design lea.hamradio.si/~s53mv/cigar/design.html Cheers, Alex

Very interesting for me being an RF engineer. BTW, I had some investigations on a loop antenna with a small bandwidth, which could possibly further improve selectivity and interference resilience.

An excellent lecture on amateur astronomy. I found that my second viewing to be much more valuable than the first, as the new concepts (and math) started sinking in. As an amateur radio operator and former broadcast radio and TV engineer, allow me to expand on the motivations of many amateur astronomers. I started out as a young child as a nighttime MW-SW listener. After a while one tends to seek out more and more distant stations, referred to as "DX." In the process, antennas are experimented with, as well as receivers. Attention is paid to the ionosphere, solar activity, and RF interference. Many people experiment with QRP, or low power transmitters. There are many low power beacons out there from VLF, HF, VHF and satellites that have calibrated powers and distances. The real DX is in outer space. It is also a step up in technology and degree of challenge. Listening to a source millions of light years away is a bit more of an accomplishment than listening to one a few thousand miles away. On the subject of meteors, I believe that the radio observations are used as an indicator for optical observations. In my experience, meteor storm prediction is very similar to weather predictions. Not exactly perfect. However, using radio to detect meteor storms is real time with high precision, makes the effort to go outside on a cold night much more productive. Great lecture! Looking forward to seeing more in the future.

This is an excellent video presentation about Radio Astronomy. It is, as Jack Webb used to say "Just the Facts." It should be the template for further video presentations, as we are in a universe of information noise, and this is all information signal. Well done Sirs.

Regarding, Nathan's extended WiFi dish, drift through the Long dimension for min beam width. Antenna Beam Width measurement Run a drift scan through the Sun, record the max ampl every 10 mins or so, for +- 1.5 hours and plot Tme vs Power ( or dB ) in Excel .. The - 3dB ( half power ) points = the Beam_Width 1 hour = 15 degrees

GTP?

Thank you for bringing this on youtube. One explanation for the question posed @28:34 could be that the 60-80 degree on the Galactic plane, corresponds to the hydrogen clouds in the Cygnus constellation. This region is rich in hydrogen clouds especially around Cygnus-X region. The region around star Sadr up to Deneb is also rich in HII. Of course this is different from the neutral Hydrogen used for the 21 cm measurement. Gal degrees around 140 corresponds to the constellation of Perseus and could be from the Perseus arm of the MW.

How many dBs does the choke ring add to the SNR? I notice you only have it on the 3m and 3.2m dish pictures.

Hydrogen line observations: From frugal to advanced Part 4: Observation Results with Different Antennas Wolfgang Herrmann and the Astropeiler "Hydrogen Team astropeiler.de/wp-content/uploads/2020/01/Hydrogen_4.pdf

To measure the one way speed of light depends on how accurately time can be measured. Setup two stations with synchronized atomic clocks sending pulses of light to each other at known times. Both stations should see the same speed of light within the accuracy of the atomic clocks.

I am thinking that on the large space that encompasses the whole compound that there may some issues with the ground. The soil resistivity wont be the same across such a large area. Under all the terminals I have been a part of, there is a robust ground grid under the dish. I am a power guy though that just plays a satcomer on TV 😅.

Have you tried replacing the RF switch with a directional coupler? You can get a better than 0.2dB insertion loss. Also, it's hard to measure low NF with this method. The uncertainty in your measurement could be more than your measurement itself.

To any amateur wondering if the two hours are worth it: Yes! :)

it would seem here that a NanoVNA would be an invaluable tool for this.

This was very helpful!!

U can provide a access to the datasets?

It is so bad that Radio Astronomy Supply is no longer selling products.

Can I use a SDRplay RSPdx software defined receiver that I use with SDRuno and SDRshart to access and operate the SUPERSID software?

this is fucking sick

*** Exec Summary *** The Coefficient of Gain Variation vs Temperature for the Sawbird+ H1 LNA : - 0.009 dB / Dg C or just remember : - 0.1 dB Gain Change / + 10 deg C

Thanks, Alex! AF