Lmst

Alternatives à gmail et google en général sont pour moi: #Protonmail ou #Gmx si vous n'avez pas besoin du VPN. Perso j'ai les deux. #Signal pour remplacer messenger. J'ai signal depuis des année sur mon ancien GSM; je ne l'avais pas mis sur mon français.
Oui, je dis #GSM ou #Smartphone pour le #Cellulaire et #Portable pour les #Ordinateurs. Il faudra vous y faire.

Testing and modifying the “POTA PERformer” antenna

What is the POTA PERformer? Greg Mihran KJ6ER has introduced us to an antenna that he calls the “POTA PERformer”. The capitalized PER in its name is an abbreviation for “Portable, Elevated, Resonant”. But what is it really? The POTA PERformer is an adjustable elevated vertical radiating whip with two adjustable elevated radials. In concept there is nothing really new about it, but the unique implementation devised by KJ6ER is quite interesting.

Get up off the ground

Tripod mounted whip at Ham Radio Outside the Box

Most hams will be aware that a quarter wave vertical antenna, mounted on the ground, requires an extensive system of radials to be efficient. I have successfully used such an arrangement with as little as four radials during a POTA activation out in the Big Blue Sky Shack. But, as they say, even a poor antenna will get you contacts when conditions are right. Some recommend as many as 120 radials although anything over 16 provides very little further improvement. In a portable situation laying out a lot of radials for a short-term temporary station doesn’t make a lot of sense. So what is the alternative?

Less is more

If the base of the antenna is raised above the ground, fewer radials are needed to form an effective counterpoise and make the antenna efficient. How many? KJ6ER has settled on two radials for the POTA PERformer. If the radials are arranged at 90 degrees to each other the antenna has a directional radiating pattern. But using two radials increases the footprint on the ground and that could be an important consideration if, for example, we are operating on a narrow trail. Could we get away with just one radial? I modeled a POTA PERformer using EZNEC and came up with a comparison, shown in the following table.

TABLE: 1 radial versus 2 radials

Now I’ll admit that I am no expert in computer modeling, but the results I obtained seem to differ from what KJ6ER found. In either case, whether two radials or just a single radial are used, we have a directional antenna that can be rapidly deployed in the field.

One radial or two? Now here’s a surprise!

The original POTA PERformer is a multiband antenna. It covers all the bands from 20m up to 6m with a 17ft telescopic stainless steel whip and adjustable length radials. KJ6ER suggests extending the band coverage to 30m and 40m by means of a loading coil at the base of the whip and then … surprise … combining the two radials to create one long radial wire. I suspect the 30m/40m version may lack some of the gain and efficiency of the higher band version due to the losses involved in base loading a vertical radiator. Perhaps a full length vertical wire supported by a pole, or a tree, might be better.

I have always felt there is something incongruous about using a counterpoise that is longer than the radiator. Perhaps that concern is unfounded if we consider that a raised radial wire also radiates.

Customizing the original clever idea

I have tried the POTA PERformer with both a single radial and two radials. Both versions “worked” and I made contacts. It is difficult to interpret which was better, but my own preference – for field expediency – is a single radial. The 20m, 30m and 40m bands are my preferred haunts, only for the reason that two of my QRP radios do not support the higher bands. Even though the POTA PERformer is a great idea with very positive reports from several sources on YouTube and elsewhere, it doesn’t fit well with how I like to operate. Here is why.

Please remain seated

A raised radial wire is a tuned counterpoise. Its length is important. That means band changes involve adjusting the length of the radial(s). One way of doing this is to insert a non-conducting link in the wire and move it between linked sections to set the conducting part of the counterpoise to the correct length for the band of operation. The overall length remains the same but the sections of the wire not being used are isolated from the rest of the antenna. Another way that I have tried is to use a metal measuring tape and unwind it to the correct length. Perhaps using multiple raised radials where each wire is adjusted for a different band would also work. Whatever method is used, getting out of your chair and fiddling with radials and whip lengths is a time consuming distraction. So what’s the alternative; how can you stay in your seat and change bands?

Get on the ground and spread ’em!

Sacrificing a little efficiency is required but it can be done. My own method is to spread out four radials wires in a fan pattern on the ground, facing the direction I want my signal to go. Are four ground radials enough? If the vertical element is ground-mounted then using only four radials results in efficiency loss. But, if the whip is elevated? Who knows, but it works.

Since ground radials are detuned their length is not critical. No adjustment is required whether operating on 20m, 30m or 40m. The only requirement is that there is sufficient copper on the ground to provide a good counterpoise; I use 4x13ft radials. Orienting all the radials in one particular direction does improve the signal in that direction to a small extent. How much efficiency is lost? That is very hard to quantify but the convenience factor is high.

A 17ft whip with an adjustable loading coil (bypassed for 20m) will cover all three of the bands that I need. I have also used a 9ft “tactical” whip whose fixed length sections are held together with bungee cord. This shorter whip uses a separate loading coil for each band and is usually only employed with my QROp rig (a 100 watt radio that is usually set to 20 watts or less). This radio gives the ability to transmit a little more power when needed.

“QRP when possible, QROp when needed” – Ham Radio Outside the Box

Is there any real difference between 5 watts and 20 watts? Maybe not but it does give me a nice warm feeling – especially if I get too close to the antenna while keying up.

To better understand and learn more about the POTA PERformer it is worthwhile downloading and reading Greg KJ6ER’s PDF document. It may inspire you to build one or even devise your own variant to suit your unique operating needs.

Note to Fediverse readers: the formatting of this post may be presented better on the original WordPress site. Visit: https://hamradiooutsidethebox.ca/2025/05/27/testing-the-pota-performer-antenna/

Help support HamRadioOutsidetheBox

No “tip-jar”, “buy me a coffee”, Patreon, or Amazon links here. I enjoy my hobby and I enjoy writing about it. If you would like to support this blog please follow/subscribe using the link at the bottom of my home page, or like, comment (links at the bottom of each post), repost or share links to my posts on social media. If you would like to email me directly you will find my email address on my QRZ.com page. Thank you!

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#AmateurRadio #Antennas #Counterpoise #Ground #OutdoorOps #Portable #POTA

#portable : capable of being borne or carried

- French: portable

- German: mitnehmbar, portabel

- Italian: portatile

- Portuguese: portável

- Spanish: portátil

------------

Fill in missing translations @ https://wordofthehour.org/r/translations

Los chinos ya se comieron el mercado de los ultrasonidos portátiles. Adiós #Butterfly y #Lumify, hola vendedores de #Temu y #Aliexpress

#IV #VascularAccess #Portable #Ultrasound #Wireless

A medical professional is using an ultrasound device to assist with a procedure on a patient's arm, which shows a clear view of the skin and an intravenous needle being inserted. A smartphone displaying ultrasound imagery is placed nearby.

Neue Podcast-Episode: Das erste Atari Flashback Portable erschien im November 2016. Wie fühlt sich die Konsole an? Lohnt sich das Handheld, oder ist es nur etwas für unrettbare Retro-Fans?

Von @deanjimmy @drpongspraxis

https://videospielgeschichten.letscast.fm/episode/das-atari-flashback-portable

#atari #handheld #flashback #portable

MUSE HiFi M5 Ultra Review

The M5 Ultra is a fascinating little dual solid-state and tube portable amp. Packed with Bluetooth and also more on the affordable side, it could well be a bargain buy.

How does it perform? Marcelo finds out in his debut review, now published on Headfonics!

https://headfonics.com/muse-hifi-m5-ultra-review/

#tubes #headphones #earphones #wireless #amplifier #portable #canjam

Reviving a Webster Band Spanner – a 1950s manual screwdriver antenna

About 20 years ago I was approached by a neighbor who, knowing that I am a ham, asked if I might be interested in looking at some of the old ham junque he had accumulated over many years. He was a fine gentleman, in his golden years, who was no longer active in the hobby. Hesitating for less than a microsecond I eagerly agreed. Among the treasures I acquired was a Signal Electric straight key. I believe it was an R48 model first introduced in 1920 when it sold for $2.80. But my prized acquisition was a Webster Band Spanner antenna.

The Band Spanner was produced in the 1950s and 1960s by the Webster company in San Francisco. It is a center-loaded manual screwdriver antenna intended for mobile operation. Unlike modern screwdriver antennas, like the popular Tarheels, that use an electric motor to make band changes, the Band Spanner has to be manually adjusted for each band by sliding the whip up and down.

Two models were produced; the A-61 and the A-62. The A-61 (that I acquired) has an extended length of 93 inches and a collapsed length of 60 inches. The longer A-62 model has an extended length of 117 inches and a collapsed length of 63 inches. Both models support the 75-40-20-15 and 10 meter bands. There is a mark on the whip indicating the mid-point of each band. I suspect the WARC bands could also be tuned although it would be necessary to locate the correct whip length by trial and error. The antenna is rated for “100 watts or more”.

Whip connection contact Coil section (top), lower radiating section (bottom)

The Band Spanner is constructed from a fiberglass support column with a 24-inch long internal loading coil. At the base of the whip is a circular contactor that connects with the windings of the loading coil. As the whip is raised or lowered, the contactor connects to individual exposed turns of the loading coil inside the support column. This type of continuous adjustment permits exact resonance to be achieved anywhere within a band. It is a very high Q antenna – moving the whip just one click up or down (one turn of the loading coil) makes a significant difference to the tuning.

Would the vibration of a vehicle change the tuning?

Whip locking screw

You might expect that a bumper-mounted antenna would be subjected to a lot of stress as a vehicle crashed through pot-holes and other rough ground, but there is a very tight connection between the whip and the loading coil. The connection is so tight that it requires some force to adjust the whip length and it is quite possible to skip a turn if too much force is used. The tight connection has a another positive benefit – it makes the connection point self-cleaning. There is also a locking thumb screw at the base of the whip to help secure it in place.

Stationary mobile operation

Bumper mount

I am not a mobile HF operator; there are enough distractions already to compromise driving safety, so I prefer to use the Band Spanner as a stationary mobile antenna. For those who do intend to use it as a mobile antenna, there is the H-200 ball mount (shown in picture).

I have tried several ways of mounting the Band Spanner as a temporarily fixed position portable antenna. The manufacturer suggests using a matching section of 21 feet of RG-8/U coax and grounding the shield of the coax to the vehicle body. I did once try using such a matching section with a Band Spanner on a tripod, but it didn’t seem to improve the tuning at all. Most recently I attached my Band Spanner to my “QROp” (5-100 watts) radio set. It is a Yaesu FT-891 mounted inside a mil surplus 50-cal ammo box. The Band Spanner was connected directly to the rear of the rugged steel case. My ham-made L-match tuner was used for fine adjustment of the SWR.

Ammo can radio set with FT-891 transceiver; ham-made L-match; CWMorse extruded aluminum paddles; Bioenno 12Ah LiFePO4 battery in canvas pouch (left of picture) and Webster Band Spanner antenna attached at rear.

Tuning was fairly easy. I set the radio to 20m and 5 watts power output. I threw a 17ft wire counterpoise on the ground behind the radio. A single wire counterpoise is not really sufficient ground for this antenna so additional inductance had to be added via the L-match. I would usually lay out at least 4 radials for a portable vertical antenna, but I was on a mission. I wanted to find out if the Band Spanner could be employed as the radiating element of a “POTA PERformer” type of antenna. Ham Radio Outside the Box will be exploring the “POTA PERformer” in more detail in an upcoming post. For now we can describe it as simply a raised quarter wave whip with raised tuned radials.

Now comes the surprise

Having tuned the antenna with one ground radial to less than 1.5:1 SWR I thought I was on a roll. Next step, I raised the radial so that it would not be detuned by contact with the ground. I now had the Band Spanner set for the 20m band, finely adjusted by means of the L-match to give a good SWR. I expected some further adjustment might be necessary with a raised 17ft counterpoise, so imagine my dismay when the radio flashed its “high SWR” warning.

The Band Spanner is intended to be used while mounted to a couple of tons of steel vehicle serving as its counterpoise. It is a very short, loaded vertical antenna with very high Q performance. A lesson I learned early in my ham career, but overlooked in this exercise, was that a short-loaded, high Q vertical whip requires a carefully tuned counterpoise – or a good ground. Simply using a raised 17ft wire isn’t good enough. I would have had to precisely trim the raised radial wire to get a good SWR. To make this even more complicated, a precisely trimmed radial wire counterpoise for each band would be required. So the mission objective to examine the Band Spanner’s suitability as a portable POTA PERformer was concluded. In future, the Band Spanner will be used with the best ground system I can erect during a temporary field installation.

Another thought …

A Band Spanner (or even better – a motorized screwdriver antenna) could possibly be used in an HOA situation. If it were ground mounted, with a good system of buried radials, it could potentially be disguised to prevent detection by the HOA hounds.

And finally …

I am not sure of the actual age of my Webster Band Spanner. They were produced in the 1950s and 1960s so I estimate it to be at least 60 and maybe as much as 75 years-old. The bumper mount has entirely lost its plating and is now a dull rust color. The fiberglass support column is equally dull and has lost its identifying markings. But, the antenna still functions as the Webster company intended all those years ago, which is more than can be said for its owner who is of the same vintage!

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#AmateurRadio #Antennas #BandSpanner #Counterpoise #Ground #OutdoorOps #Portable #POTA

I am bigger than you – Portable challenges Cubana Chief Priest to N100m boxing match (Video): Controversial street-hop artist Portable, also known as Habeeb Okikiola, has sparked new excitement in the entertainment world by challenging nightlife icon Cubana Chief Priest to a celebrity boxing match. The singer, who recently defeated Speed Darlington in a celebrity boxing bout, said he is now targeting “bigger” opponents to… https://creebhills.com/2025/05/portable-challenges-cubana-chief-priest?utm_source=dlvr.it&utm_medium=mastodon #Entertainment #CubanaChiefPriest #Portable

Lena Lovefelt and his Commodore SX64

#commodore #cbm #SX64 #8bit #Retrocomputer #retrogaming #videogames #portable #color #80s #90s #Geek

https://www.alojapan.com/1275440/bluetti-unveils-innovative-portable-power-solutions-at-2025-osaka-kansai-expo-2/ BLUETTI Unveils Innovative Portable Power Solutions at 2025 Osaka-Kansai Expo #2025 #at #Bluetti #expo #innovative #Osaka #OsakaKansai #OsakaTopics #portable #power #solutions #Unveils #大阪 #大阪府 OSAKA, Japan, May 16, 2025 /PRNewswire/ — BLUETTI, a global leader in sustainable energy solutions, captured attention at the 2025 Osaka-Kansai Expo, showcasing its latest portable power stations from May 12 to 14. Visitors explored advanced energy sol…

UPDATE OF THE UPDATE!

Folks! I have updated my modified #ThonnyIDE #portable for #Windows with #py5 pre-installed, updating py5 to v.0.10.6a, which uses jpype 1.5.2 and I think will solve the nasty non-ASCII path issues, yay!

Would someone on Windows like to help me test it?

https://github.com/villares/thonny-portable-with-py5/releases

More about this Thonny + py5 thing here: https://abav.lugaralgum.com/como-instalar-py5/index-EN.html

#CreativeCoding #Processing #Python #GenerativeArt #AlgorithmicArt #DataViz #EduComp

Matching an EFHW antenna – a third way

There is no doubt about the popularity of the End-Fed Half-Wave antenna. It is used by a very large number of hams, especially during portable operations like POTA, SOTA, WWFF etc. Why is it so popular? The principal reason seems to be ease of deployment. The EFHW requires only a single support and can even be used without any kind of transmission line – i.e. it can be directly connected to a radio without any coax, so zero transmission line losses!

clipart-library.com

But despite those advantages the EFHW has its critics. There are two principle objections: first the commonly used 49:1 impedance transformer, or UNUN if you prefer, is claimed to be inefficient.

Secondly, the antenna wire is only a half wavelength long on its design band. Although it can be used on its even harmonics the antenna becomes multiple half-wavelengths long. Of course, we know that the impedance of the wire is theoretically replicated every half-wavelength so that shouldn’t be a problem.

It is even possible to get a 1:1 SWR match on other bands by pressing “the magic (Tune) button”. That doesn’t make the antenna any better but it does convince the transceiver that it shouldn’t roll back the power, or even worse, throw an exothermic hissy fit.

The disadvantage of using an EFHW as a broadband antenna is that the radiation pattern may change with each band. It may even break up into multiple lobes, making getting contacts a hit-and-miss affair.

If you are standing on the top of a wind swept mountain with a storm approaching and you need to get your 4 contacts to qualify a SOTA activation, you may not be entirely engrossed in the finer points of antenna physics. I have been an EFHW user for many years and have thousands of QSOs in the log. For a long time I was blissfully unaware of what a terrible antenna I was using while I battled countless pile-ups and enjoyed the thrill of operating my radio out in the Big Blue Sky Shack.

Those were the days my friend

As I read more and more about the theory of the End-Fed Half-Wave antenna I would deploy mine and agonize about efficiency and radiation patterns while reminiscing about the days when ignorance was bliss and I just enjoyed my hobby.

Keep It Sweet and Simple – Use a dipole

Critics often argue that a simple dipole is a good replacement for the EFHW. After all, both antennas are a half wavelength long; the main difference is where they are fed. A center fed dipole has a nominal impedance of 70 ohms, not 50 ohms, so still not perfect. It is usually erected as a “flat-top” which requires three supports. No problem in a quiet corner of the forest where nature benevolently provides ample leafy poles, but in a public park where zealous guardians of arboreal sanctuary patrol the greenwoods you may indeed have a problem.

A dipole can be erected in other ways, for example as a sloper. Now only one support is required but another tiny problemette arises – the feedline has to be kept at 90 degrees to the radiating wire. In either deployment fashion a long feedline is required. Let’s say we are operating a flat-top dipole on 20m. The antenna should be a half wavelength above ground so we need three 33ft/10m supports and 33ft/10m of coax feedline. The center support pole could be omitted but the weight of 33ft of coax plus a 1:1 UNUN at the feedpoint will drag the feedpoint down.

The long and winding (coaxial) road

Unless the operator is sitting right beneath the feedpoint, even more coax is needed to reach the radio. Two issues here, the coax will incur some loss although it is often too small to be significant. Secondly, the SWR will be changed by the coax loss – perhaps for the better, but it may create the illusion of a better SWR than is actually occurring up on the antenna wire.

Don’t leave home without it

You could connect the dipole feedpoint directly to the radio and operate the antenna in a “V” orientation. I did do exactly that during an emergency (I had inadvertently left my antenna at home) and successfully completed a POTA activation using a spare piece of wire. It must be realized that the feedpoint in such an arrangement is a high current point, and hence a point of maximum power radiation. Some of the radiated energy will be cooking the earthworms – and the operator!

Linked 20m, 30m, 40m EFHW arrangement

So back to the “horribly inefficient, avoid-at-all-costs, snake oil” End-Fed Half-Wave antenna. How can we overcome the problems exaggerated by its naysayers? First, make it a single band at a time antenna. What do I mean by that? Use a separate wire for each band? There is a very simple way to do that. I designed and built a 3-band EFHW for 20m, 30m and 40m. I started with a half wavelength of wire on the 20m band but added a 2mm banana connector at the end. I then attached an extension wire to make the the antenna a half wavelength on the 30m band – again with a 2mm banana connector at the end. Then another extension for the 40m band. Each section of wire is attached with a short piece of thin cord to allow the links to be adjusted for each band.

And now for something completely different

Now for the biggest objection to the EFHW – the matching device. Ham Radio Outside the Box has already discussed two different matching devices, the 49:1 impedance transformer and the L-network. Now we have a third competitor in the race to perfection – the tuned tank circuit. I have to credit two sources for the inspiration to try this method: Steve AA5TB and John M0UKD. Both these gentlemen have built what is essentially a parallel tuned circuit to match the very high impedance at the feedpoint of an End-Fed Half-Wave wire to the 50 ohms expected by a transceiver.

EFHW parallel tuned circuit matching device

Being an avid experimenter by nature I had to build one myself to see if it would work. I get the most enjoyment out of projects that go from adrenalin inspired enthusiasm to field trials in a half hour or less. As a result the finished product is often inelegant but hopefully functional. And so it was with this project. Having a collection of radio-junque accumulated over decades helps.

The picture shows a little project I threw together in a half hour to test whether AA5TB and M0UKD were promoting a good idea or snake oil. Both were using a variable capacitor to tune the tank circuit but, in my haste, I substituted a coax capacitor to make a matching device that would serve only a single band – I chose 20m.

**RED ALERT** **RED ALERT** **RED ALERT**

The parallel tuned circuit comprises, in addition to a variable capacitance (mine is variable by trimming its length with side cutters), the secondary winding of an impedance transformer. An impedance transformer? Isn’t that the weak link in the common 49:1 UNUN design employed by the unenlightened multitude?

I forged on regardless. A powdered iron toroidal core is used instead of the usual ferrite material. Why? To reduce the inductance to a level that can be resonated by the capacitor. As an experiment I tried winding 14 turns of magnet wire on a FT82-43 core but the inductance was way too high. The alternative is to use a powdered iron core and the only one I had in my junque box was a T200-2 so it would have to do. Another alternative is to wind an air core inductor. I soldered the coax capacitor in parallel with the secondary winding then wound two turns over the center of the secondary to create the primary winding.

Now, armed with my faithful side cutters I boldly went out onto my deck and hooked my new hastily built tank circuit matching unit to a piece of wire that I had previously established to be a true half wavelength on 20m. I attached a short coax between the matching device and my RigExpert AA55 Zoom antenna analyzer, fully expecting a “you gotta be kidding me” message on the display.

Surprise!

The RigExpert displayed a different message: “no snake oil here” craftily encoded by the numeric “1.8:1”. I was cheerily gobsmacked and, encouraged, I adjusted my “variable” capacitor with the side cutters a tiny bite at a time and watched as the SWR dropped inch-by-inch (2.54cm-by-2.54cm?). When the SWR dropped below 1.5:1 I laid down the side cutters and declared the match “good enough”.

Like a bridge over troubled waters

It all seemed too easy. The troubled waters of the End-Fed Half-Wave antenna have now been crossed by three different bridges: the traditional 49:1 UNUN, an L-match and now a tuned tank circuit. If the inefficiency of the traditional 49:1 UNUN arises in the flux leakage between its windings then the tuned tank circuit approach replicates that weakness. Perhaps flux leakage is even worse when using a powdered iron toroid or air core design. In one of AA5TBs projects the tank circuit inductance comprises an air core inductance with an 8-turn secondary and only a single turn primary which I found very surprising.

There are still more ways of matching the high feedpoint impedance of an EFHW antenna that may be explored later on Ham Radio Outside the Box, but for now the simple L-network seems to offer the best hope for a high efficiency matching device. What is your opinion? Let me know in the comments or, if you prefer, send me an email (good on qrz.com). I reply to all email received.

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#AmateurRadio #Antennas #EFHW #OutdoorOps #Portable #POTA

The #Beats Pill became a truly great #portable #speaker with its mid-2024 #refresh. And now it's one-third off at just under $100. https://www.cultofmac.com/deals/beats-pill-deal

I wrote a thing, and if you're interested in #EdTech #TEL or #Education you might want to give it a wee read:

PSP Refurb

https://blog.mcchristie.com/psp-refurb/

#Electronics #Playstation #Portable #PSP #Refurbish #Retro

AMVCA 2025: ‘There’s gang up against Ibrahim Chatta’ – Portable: Controversial musician Portable, also known as Habeeb Okikiola, has made allegations of a conspiracy against certain individuals in the Nigerian entertainment industry. According to Portable, actor Ibrahim Chatta was unfairly targeted in the movie industry, resulting in him missing out on winning an award at the eleventh Africa Magic Viewers’ Choice Awards. Chatta… https://creebhills.com/2025/05/amvca-2025-theres-gang-up-portable?utm_source=dlvr.it&utm_medium=mastodon #Entertainment #IbrahimChatta #Portable

Razer Launches Portable Joro Keyboard, Basilisk Mobile Mouse #basiliskmobile #gaming #hardware #joro #keyboard #keyboards #mobile #mouse #mousemousepad #peripheral #portable #razer

https://www.lowyat.net/2025/351163/razer-portable-joro-keyboard-basilisk-mobile-mouse/

Tonight marks the 180th day since portable’s birth, an efficient and accessible Linux desktop sandbox written in bash.

So glad that it’s still evolving to this very day. Thanks for everyone that provided suggestions and helped.

#Linux #portable #Sandbox #shell

https://github.com/Kraftland/portable

🔭 Checking RF Line-of-Sight & Path Profiles? Here are my favorite tools:

📍 🇨🇭 https://map.geo.admin.ch – Best for Switzerland, highly detailed terrain & infrastructure

🌍 https://www.heywhatsthat.com/profiler.html – Great desktop tool with advanced profile parameters. Less mobile-friendly, but powerful

📱 https://rflineofsight.scadacore.com – Mobile-friendly line-of-sight tool by ScadaCore. Quick & clean!

🌐 https://www.arcgis.com/apps/Profile/index.html – Ad-free, reliable elevation profile tool with solid global coverage

#CBradio #cb #portable

For #makershour today I will be teaching (last day of spring semester classes!) so here is a quick "what fucking thing am I working on this week?"

It is a boom box. Well, a #portable #stereo. Okay, a "portable" stereo. I started by trying to make speaker enclosures with no parallel surfaces inside, and the project kind of ballooned from there.

Current drivers are pretty bad, so that will be upgraded. I also need a battery and some knobs. I'm pleased, overall.

#budgetaudio