Search found 36 matches

by Airwind
Mon Jun 10, 2019 2:35 pm
Forum: User Projects
Topic: How to buy an SDR chip
Replies: 9
Views: 1523

Re: How to buy an SDR chip

Hey rtlsdrblog, you think maybe you can sell a few of these chips on your webstore?
by Airwind
Fri May 10, 2019 6:54 pm
Forum: Antennas
Topic: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...
Replies: 7
Views: 1903

Re: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...

I finally understand what a balun is! So I'm going to write this down in case some other confused soul comes along and tries to learn the same stuff. Anyway, what is a balun you ask? Well as it turns out I had the correct answer right underneath my nose all the time, but I was too confused with all...
by Airwind
Mon May 06, 2019 12:03 pm
Forum: Signal Identification Help
Topic: Decoding 433mhz windowblinds
Replies: 1
Views: 919

Re: Decoding 433mhz windowblinds

Zoom in into one of those repeating signal chunks you see in audacity.
by Airwind
Sun May 05, 2019 2:30 pm
Forum: KerberosSDR
Topic: Some questions about KerberosSDR
Replies: 7
Views: 1263

Re: Some questions about KerberosSDR

kb3cs: I was merely theorizing that it should not matter how strong the received signal is (assuming it is within the receiver detectable boundaries) because all antennas would see the same power/signal increase and decrease relative to each other. And assuming antennas are identical then the recep...
by Airwind
Sun May 05, 2019 2:13 pm
Forum: KerberosSDR
Topic: Some questions about KerberosSDR
Replies: 7
Views: 1263

Re: Some questions about KerberosSDR

You could update the code if you could do the math and figure out the algorithm for various arrangements, I see, so it comes down to the algorithm then. but i'm not sure why you would want to do that. Other types of arrangement would be suboptimal, you'd essentially be sacrificing an antenna. Oh, h...
by Airwind
Sun May 05, 2019 9:29 am
Forum: KerberosSDR
Topic: Some questions about KerberosSDR
Replies: 7
Views: 1263

Re: Some questions about KerberosSDR

Hey, thanks for the answers, I really appreciate it. KerberosSDR is 4x RTL-SDRs with some circuitry to make it coherent. So even if you're not using the coherent features, you can still use it as 4 independent tuners. So you could use a splitter to connect a single antenna to all four ports. I'm not...
by Airwind
Sat May 04, 2019 11:07 am
Forum: Antennas
Topic: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...
Replies: 7
Views: 1903

Re: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...

Get a copy of the ARRL or RSGB antenna handbook and you have the Basics in a simple form. Here's a snippet from the ARRL handbook 2017, chapter 21.2.3: Baluns A balun can be constructed in a number of ways: the simplest being to coil several turns of coaxial cable at the antenna feed point. This cr...
by Airwind
Fri May 03, 2019 3:42 pm
Forum: KerberosSDR
Topic: Some questions about KerberosSDR
Replies: 7
Views: 1263

Some questions about KerberosSDR

Hello, I have some questions about this interesting SDR. What kind of antennas work best for direction finding? Can this SDR be used for wideband scans with single antennas or do antennas need to be changed per frequency/band? Can the placement of antennas be arbitrary? I've only seen a video where ...
by Airwind
Sun Apr 28, 2019 10:22 am
Forum: Antennas
Topic: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...
Replies: 7
Views: 1903

Re: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...

BAL UN or BAL (anced/ UN (balanced) is needed when you want to connect an unbalanced/asymetrical cable/antenna (e.g.coax) to a balanced/symetrical cable/antenna e.g. a halfwave-dipole. EDIT: After reading some more material online it seems like I was wrong about this one... Like I said, people will...
by Airwind
Fri Apr 26, 2019 11:23 am
Forum: Antennas
Topic: Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...
Replies: 7
Views: 1903

Antenna tuning, impedance matching, baluns, common mode currents, my head exploding...

Hey, I was wondering about a few things on this topic... Suppose I wanted to wire up a DIY 433 MHz yagi with a folded dipole driven element. Technically speaking, what elements are needed to "complete" the antenna and for its good operation? Looking at the docs and designs I came up with this list: ...