I can't find for sale anywhere a 1:4 #balun for HF. It is for a low height 40m inverted V #NVIS #antenna. Military versions such as #AS-2259 use the custom coax support pole as an impedance transformer.
To be clear, I mean 12.5 ohm balanced antenna side to 50 ohm unbalanced coax side. The ones for sale on eBay/Amazon seem to be mislabeled 4:1 ones.
Making one isn't an option: my hands don't work properly.
Anyone any ideas.
21 grams - End Fed Half Wave Self Powered Remote Switch for portable antennas
I’m giving a ‘special talk’ on April 12 (tomorrow) at 14:00 at @clab.tw 科技媒體實驗平台 in Taipei (Taiwan), about “Temporary and Distributed Libraries, active and independent librarianship”, as part of the great Radiotopia event co-organised by the Toolkit of Care project and C-LAB, with artists and activists using radio as a medium and a concept, curated by @shulea2, and coordinated by @stwst_linz (Linz, Austria) and @agenceapo33 (Nantes, France).
https://radiotopia.clab.org.tw/
#antenna #signalprocessing #audioart #binaural #electromagnetic #interference #microphones #audiorecording #radio #radioart #radiowaves #transmissionart #soundfrequency #sound #soundart #soundartist #klangkunst #soundinstallation #soundartinstallation #soundsculpture
#soundscapes #acousticspace #sonicworld #vibration #soundarchive #audiology #soundscience #soundstudies
Made a 70.275Mhz antenna from a 85MHz helical whip by Kathrein.
With a piece of 75ohm coax stuffed into it.
I wonder what radio band this resonates on. #hamradio #antenna #randommetalobjectsontheair
Antennas have always been a weak point of mine. After a decade away from the hobby, and downsizing from a house to a ground level duplex I'm trying to figure out what the hell I'm going to do for an antenna.
I've got my rig picked out (FT 991a) but wondering if I take the compromise and do something like their ATAS-120A and slapping that sucker on a tripod in the backyard when I want to play.
Looking for opinions / advice.
The #Coomber schools #radio cassette pulls in the signal from #MidSuffolk even with just its internal #antenna (it does have to be in a particular part of the office to get any reception, but it works better than many modern receivers) #FM #VHF #BroadcastEngineering #CommunityRadio #Ipswich #Suffolk
Get the ultimate in #antenna and #coffee #technology order now!
Is a longer antenna always better? Would extending this beyond 25cm improve the signal reception for this car? (Operating frequency is 40MHz)
#RCcar #RCcars #RC #RadioControl #antenna
This is a shorting bar that grounds utility 240VAC aerial cables to the ground. Spare operator required per use.
It also acts as an adjustable, rotary V dipole, based on two alix telescopic verticals.
It should be extensible, but we never used it beyond 10m so far. Based on an idea by @yo9lig
As planned, I spent part of my day today home brewing a new VHF/UHF base station antenna. It was an easy project, and initial testing suggests it works great.
I wrote-up a complete description of the project, along with several photos. Take a peek here: https://querybang.com/2025/03/a-home-brew-vhf-uhf-2m-70cm-base-station-ham-radio-antenna/
Now, time to get to building my new DX Commander R-r-r-r-r-r-r-rapidé to go with it! 
... itz called minimalism y'all ... don't knock it .. it affects the downloads ..
#photo #photography #antenna #sky #high
Looking forward to turning this pile of hardware into a new VHF/UHF base station antenna tomorrow. Something to do while I wait for UPS to deliver my new DX Commander Rapide for HF. 
Anyone know offhand, if an FM radio station is broadcasting from a hilltop to the northeast, how should I orient a standard cheap floppy wire dipole for best reception?
Assuming the antenna long axis is vertical, should the arms of the “T" be perpendicular to northeast?
Also, how could I couple a dipole to a clock radio with a short single wire antenna and no antenna terminals?
I personally watched someone use an air cannon at field day to put an antenna wire over a tree. So yes, this video is made as a toy but they can be useful.
I've seen slingshots used as well and dog toys. I watched someone use a long plastic pipe extension gizmo. I guess pick your tool. ;)
https://universeodon.com/@SrRochardBunson/114186692025120398
The wind died down, the sun came out, and I was able to trim the #OCFD #antenna for my #HF #HAMradio operations...
This is post-choke install, and post trim of the long side of the Off-Center Fed Doublet. I cut about a foot off of it, and BAM! the bands lined up.
I am SUPER happy with the results showing on the #NanoVNA Just need to go back out to the back yard and tie the feedpoint support up and then it's time to operate and test the antenna.
This has been a fun experiment.
