📡 What is Microwave Engineering?
👉 Click here: https://engineersheaven.org/forum/topic/46
to visit our website and read the full article.
#MicrowaveEngineering #RadarTech #WirelessInnovation #TelecommunicationEngineering #SignalProcessing #RFengineering #AntennaDesign #FutureTech #STEMeducation #EngineersHeaven #EngineeringExplained
My first #HB9CV #antenna, believe it or not, made from 5mm brake lines and a foot of 15mm copper pipe 🙂
I need it for a 70cm radio #foxhunt event in a couple days - looked different places for design guidelines, some of them came up with quite different results 🤷🏼♂️🤨
Decided to just have go at it, based on a combination of what I could find in the legendary #Rothammel antenna book and some online sources and it turned out quite well 😃
Resonance is a bit low, 431MHz, but it’ll do fine as a direction finding device: what I really want is the characteristic kidney shaped radiation pattern, allowing me to turn the antenna backwards, looking for a minimum in the received signal.
Funny to see how the #smithchart impedance plot has a distinct turn at the resonance frequency 🤓
#rfengineer #hamr #antennadesign #testandmeasurement #electronicsengineering
🚀 New Video Alert! 🚀 Learn how to install HFSS on any Linux distro using Bottles. Perfect for antenna design and RF enthusiasts! 📡
Watch now: https://youtu.be/ydEOdOd2ZP8
#Linux #HFSS #Bottles #FlatSeal #AntennaDesign #RFEngineering #Antenna #RF #TechTutorial #PhDLife #LinuxInstallation #TechGuide @usebottles #flatpak #flathub @FlatpakApps @flathub @kubuntu #kubuntu #linuxMint #Telecommunications
I think the term ‘Flowerpot’ antenna came from the idea that you should be able to fit a 50MHz vertical dipole in a reasonably sized flowerpot and get on-air in a stealthy manner 😎🤓
Essentially it’s a piece of high quality RG-58 coax cut so there’s almost an equal length of inner conductor with the screen part removed, and a part with the screen still present. At the bottom, a coil made from that same cable on a 50mm circular plastic tubing/pipe terminates the antenna. Dead simple, and it works!
I built the 6m version a couple of years back and worked stations across Europe at #QRP levels, so this year I decided to try the 10m version, inspired by #VK1AD. Andrew built his to center at SSB, I decided to move mine slightly downwards in frequency because I’m mainly a CW-Kitty 🐱🙂
It turned out really well, at least if you ask my #nanovna ☺️
On-air tests will follow later this week 👌🏻👍🏼
#hamradio #hamr #cw #cwops #antennadesign #rfengineer #measurementmonday
The world of medical technology is constantly evolving, offering new and innovative ways to diagnose and treat patients. But behind the scenes, a silent force plays a crucial role – frequencies.
#MedTech #HealthcareTechnology #MedicalDevices #WirelessTechnology #Innovation #Healthcare #WBAN #CapsuleEndoscopy #RemoteMonitoring #CardiacHealth #UltrasoundImaging #MRIScan #FrequencyRange #ElectromagneticSpectrum #AntennaDesign #TheFutureIsHere #ScienceMatters #DidYouKnow
@IU5FHO At their 1.1GHz frequency for omni-directional use, their QFH is 50mm wide and high, which is about as squat as my usual calculator likes. https://jcoppens.com/ant/qfh/calc.en.php
Scaled for CATS’ 430.5MHz the antenna would be 130mm (5”) or so wide and high. It'll vary a bit depending on your wire size and design.
If it checks out in a simulator, maybe you could wrap 740mm (2.5’) of wire up and down around a small bucket, solder some joints, and have an antenna? @F1RAD #CatsRadio #AntennaDesign
@IU5FHO it depends on whether their QFH antenna design suits your CATS use cases?
Rosette Maria Bichara et al’s design strikes a compromise between radio performance and mechanical stability in two patterns. If you only need one pattern eg. fixed deployment for ground-to-ground use, you only need one shape. You could optimise that shape for radio performance and perhaps cost.
That said, perhaps it can be scaled for 70cm use, sure! @F1RAD #CatsRadio #AntennaDesign
@F1RAD I’ve been planning a pop-up parasitic QFH based on a kids’ dirty clothes basket, but this one is lovely. I’m in awe at their hunch and then proof that squashing it down for a change in diameter and turns gives a useful change in distribution and polarisation. #AntennaDesign
Equipped with BNC jacks and wire but lacking the requisite bucket, it occurred to me this QFH could also be built like a pop-up laundry hamper. #HamRadio #AntennaDesign #SatNOGS
Since 1998, a group of radio amateurs has been reviewing new sites for listing every day, only for their work to be turned into hot monetised garbage.
Their misery doesn't have to be yours. If you use Kagi as a search engine:
⒈ Search for "Taming the Quadrifilar Helical Antenna”
⒉ Observe DXzone's SEO-ed result
⒊ Click the shield icon to the right (⛨)
⒋ Click “Block” as indicated
⒌ Click the X icon in the upper right (☒)
Want the original? https://web.archive.org/web/20160126173128/http://www.askrlc.co.uk/ #HamRadio #AntennaDesign
New antenna just dropped. https://phys.org/news/2023-10-physicists-antenna-radio.html brb setting up my field laser matrix #HamRadio #AntennaDesign
I'm not so sure about that but, is there any antenna designer/engineer here on @Mastodon ?
#antenna #design #microwave #hfss #cst #antennaDesign #telecommunications #telecoms #telecom #mw #antenne
Came across this stash the other day, nicely piled up to be scrapped, unfortunately. Was told: grab what you want before it goes .. 😳🤷🏼♂️🤯
RF absorber pyramidal panels like these are expensive and really hard to get at as a private person, so it felt like I struck gold 😃
I filled my little car and tomorrow I’ll be back for more: hear-say travels fast in the RF engineering community and as these are located within a secured area with strict access control, I was asked to bring some of it outside the fence 😂
#rfengineering #antennaengineer #antennadesign #hamradio #hamr #antennameasurement
Suddenly it occurred to me to question the thickness of wire in a balun, and this led me to question the thickness of wire for antenna elements.
This, my dudes and dudettes, is how you ride a seguey 😜
Doing a little extrapolation from some questions on the general class exam, I suspected bigger wire would be better (more surface area), and some research confirms that, at least to a point, this is true.
Consequently, I think I'm going to go back up in the damn attic, and fairly soon, and replace my 24ga stranded wire dipole elements with some made of 18ga stranded wire, and see if I can't get that SWR down a few points.
oK, going back into the attic, I rearranged some things.
First, I'd taken up more like 18" from each end of the dipole, so I relaxed that back to about 8". This gives me an SWR of a steady 2.2 on that antenna.
I reversed the vertical orientation of the end fed antenna, such that the end is now pointing at the ground, instead of the feed. This changed the SWR on that antenna to a quite satisfactory and very steady 1.7.
This doesn't just give me options, but lets me monitor with the rasppi/hackRF rig an work with the uSDRX+
Looks like it's almost time for 10m to start heating up around these parts 😜 💢
In the continuing saga of my 10m tuned dipole:
I've removed the old video cable antenna almost entirely; all that remains is to pull the bundle down through the ceiling and pitch it in the trash; and I've shortened the dipole by pinning back about six inches from each end. This puts my SWR at about 2.2 (yuck).
Maybe that sucker needs to be slightly longer overall than 13.5 ft.
So I just downloaded and installed the latest (2022) revision of something called #xnec2c
This is the evolution of the #ARRL Antenna Design/Simulation/Optimization software. The original was in fortran; this revision is in C and runs well with X on a linux desktop.
What a frigging mess, from an interface perspective. The documentation could use a bit of work as well.
Not to be terribly critical, just making this observation as a first impression.
This piece of work may have a long and storied history, and it may be taking on the patina of age; but one sure way to let your technology slide off into obscurity is to put your tools on a shelf and worship them instead of using and improving them over time.
Lets do a python version, with a proper modern UX, some help that does more than simply describe the software, but rather works as a living reference with a few simple wizards for the novice.
In playing around in the radio world, i made a few antennas yesterday. Most were 2 meter (146 MHz centered), including a copper cactus j-pole, a ladder wire j-pole, a quarter wave ground plane, and a bnc block dipole. I also made one 70cm dipole. Now, just to tune them... #arrl #hamradio #ardc #antenna #antennadesign #maker #makingma
Brushing up on my #HFSS #antennadesign skills. Anyone know of any good tutorial videos, or challenges/projects? Thanks!
New HackadayU Classes: Antenna Basics, Raspberry Pi Pico, and Designing Complex Geometry
Get 'em while they're hot: a new session of HackadayU just opened with classes from three fantastic instructors and seats are filling up fast.
Introduction to Antenna Basics -- Instructor Karen Rucker teaches the fundamentals of antenna design as if it were your first year on-the-job. She'll cover the common types of antenna designs and the fundamentals of radio frequency engineering that go into them. Begins Thursday, May 6th.
Raspberry Pi Pico and RP2040 - The Deep Dive -- Instructor Uri Shaked guides the class through the internals of the RP2040 microcontroller, covering system architecture, hardware peripherals, and dipping into some ARM assembly language examples. Begins Wednesday, May 5th.
Designing with Complex Geometry -- Instructor James McBennett helps you up your 3D modelling game with a course on using complex geometries in Grasshopper3D (part of Rhino3D). Dive into Non-uniform rational B-spline (NURBS) and go from simple shapes to incredibly complex objects with a bit of code. Begins Tuesday, May 4th.
Each course includes five weekly classes beginning in May. Being part of the live class via Zoom offers interactivity with the instructor and other attendees. All tickets are "pay-as-you-wish" with a $20 suggested donation; all proceeds go to socially conscious charities.
For the benefit of all, each class will be edited and published on Hackaday's YouTube channel once this session has wrapped up. Check out our playlists for past HackadayU courses, or watch them all in one giant playlist.
You might also consider becoming an Engineering Liaison for HackadayU. These volunteers help keep the class humming along for the best experience for students and instructors alike. Liaison applications are now open.
#hackadaycolumns #mischacks #antennadesign #classes #hackadayu #nurbs #raspberrypipico #rfdesign #rhino #rhino3dmodeling #rp2040
