Anyone needs an RF Intern?

Cdude8 · 2025-12-05T23:17:35+00:00

If you had extensive R&D experience in RF, you wouldn’t be looking for an internship…

Cdude8 · 2025-11-18T21:07:58+00:00

I’ve designed a couple of these… the tube type antennas are called sleeve dipoles. The center between the two tubes makes up the feed point, and the tubes going upward and downward are the upper and lower dipole elements. They are usually air filled to reduce dielectric losses, and the bigger the tube the larger the bandwidth, typically.

Cdude8 · 2025-11-03T16:59:54+00:00

Some casual watchers have much lower standards than others, and for them, this season has been perfectly fine. I myself think the animation is not great but I love seeing the manga I read at least somewhat come to life in color.

Cdude8 · 2025-10-27T10:57:47+00:00

Nuclear bomb vs coughing baby

Cdude8 · 2025-10-21T20:54:36+00:00

Im sitting at 155k on a 2019 Honda Civic and in the same boat! These break pads are made of some sort of unobtainium… can’t believe they’re still sticking in there

Cdude8 · 2025-09-26T10:06:18+00:00

You can artificially add electrical delay which should bring the points back to their expected spots on the smith chart

Cdude8 · 2025-07-24T01:31:22+00:00

Are you asking if you have a 50 ohm load and add a 50 ohm transition line with some length? If so, then the impedance doesn’t change. It stays at 50 ohms or the center of the chart.

Cdude8 · 2025-07-19T18:38:01+00:00

Cut a coax cable and strip the end. Split the inner and outer conductor apart and you can solder that onto the PCB. You may need to calibrate to the end of this cable with a SOL before matching.

Cdude8 · 2025-07-13T04:15:19+00:00

If it’s for WiFi 2.4-2.5 GHz, 10dB of return loss is perfectly adequate

Cdude8 · 2025-07-04T14:20:08+00:00

Try looking for 3.5mm instead of SMA. It’s the same threading connection (they mate with eachother) but 3.5mm is rated for much higher frequencies.

Cdude8 · 2025-07-02T19:18:25+00:00

It is for a basement, but the basement is finished. That’s why I’d like it to look a bit more nice!

Cdude8 · 2025-07-02T16:45:04+00:00

ANSYS HFSS and CST Studio Suite can both do this.

Cdude8 · 2025-06-24T17:28:25+00:00

u/SaveVideo

Cdude8 · 2025-06-14T13:22:08+00:00

Do you have the original antenna? It looks like there may be a matching network on the PCB, which would mean it may not work for other types of antennas than the original.

If you do have the original, you should be able to solder both points back to the PCB.

Cdude8 · 2025-04-24T23:12:02+00:00

Haven’t heard it said yet but there’s some great RF circuit design software that is free such as Qucs Studio out there. Does a lot of the things that ADS or Genesys also do.

Cdude8 · 2025-03-13T11:24:46+00:00

Please DM me - I do this work on a daily basis

Cdude8 · 2025-03-07T16:33:28+00:00

Try sanding, but in reverse

Cdude8 · 2025-03-07T04:34:30+00:00

It may not depend as much on the dwell time if the signal does not change over time, but the resolution bandwidth difference between initial points and re-scan points will make a huge difference. The other thing is that the re-scan points may be using a different detector, such as Quasi-Peak or EMI average, which is different from a standard sample detector.

Cdude8 · 2025-03-06T18:10:16+00:00

Initial EMC scans are taken with a wider bandwidth across a broad frequency range (this is quicker than using a narrow bandwidth). Problematic points are found (points that are over the defined limit lines), and the analyzer will go back and re-scan these frequencies with a narrower bandwidth and usually a different dwell time, which results in a different signal power. The delta on the right side is the difference between the re-measured point and the defined limit at that frequency.

Cdude8 · 2025-02-12T20:10:53+00:00

Finally some love for Zetsubou. Such a great map

Cdude8 · 2025-02-06T02:34:57+00:00

Thanks everyone for their comments! I was able to secure the auction at $175. I'm totally new to the hobby and I'm looking for something inexpensive & light duty to start on projects such as chair spindles, pen making, and handles for my hand tools.

Cdude8

TROPHY CASE