Get involved with the RSGB LoRa high-altitude balloon challenge

I like the look of the #RSGB LoRo high altitude balloon challenge.

The project has been developed by the RSGB Outreach team and takes place on Saturday 20 September. #hamr #hamradio #amateurradio

https://rsgb.org/main/blog/news/gb2rs/headlines/2025/07/25/get-involved-with-the-rsgb-lora-high-altitude-balloon-challenge/

If you are studying (or cramming) for your Canadian #AmateurRadio Operator Certificate Basic Qualification exam, remember that today, 7/15, is the 1st day of the new question bank. Unlike the US NCVEC question pools that get updated every 4 years, the Basic question bank hasn't been updated since 2013.

I have read the report on the changes & a LOT of work went into the updates which had to make sense in both official languages.

Details: https://www.rac.ca/update-of-basic-amateur-radio-exam-ised/

Here's a monday tip for hams and computer folks - something I've discovered:

If you use Android phones, DON'T use .local as your lan pseudo-TLD.

Android doesn't work correctly with .local - use .lan or something else instead, set it in the DHCP section of your router.

Otherwise you may have trouble accessing those .local devices with your phone.

Have a great Monday! 73
NS0D #hamr #hamradio

For folks participating in #FieldDay today, how has it been going?

Amateur Radio Classes, Women’s Ham Radio ‘Technician’ (beginner) Class

This class is taught by women, for women!

The Fall 2025 class will be offered online via Zoom

https://ylrl.net/classes/

( 𝗥𝗘𝗦𝗨𝗠𝗘𝗡 ) 𝟯𝗗𝗔𝟬𝗚𝗬, 𝗘𝘀𝘄𝗮𝘁𝗶𝗻𝗶 https://buff.ly/9WkLkIX #hamradio #dx #hamr

Make sure to update your Meshtastic devices to at least 2.6.2 or newer!

"This attack does not require authentication or user interaction, as long as the target device rebroadcasts packets on the default channel."

https://www.cvedetails.com/cve/CVE-2025-24797/

The ‘Lambda Diode’ circuit, made from two J-FETs (one P- and one N-Channel) exhibits ‘negative resistance’ and has a ‘hysteresis’ curve when viewed on a curve tracer. A bit like a ‘tunnel diode’, actually.

Circuits like these were a common way to make an oscillator from just a few components, as my next post will show.

I always end up using my analogue #Hameg scope for curve tracing in X-Y mode, it works a lot better than any of the digital scopes I have In fact, I have yet to experience a digital scope with even a half-decent X-Y mode..

Thanks for the inspiration @va3db

We might have skipped the valve/tube era if not for those pesky kids!
https://earlyradiohistory.us/1924cry.htm

Happy World Amateur Radio Day!

https://www.arrl.org/world-amateur-radio-day

World Amateur Radio Day is coming up on April 18th, 2025!

https://www.arrl.org/world-amateur-radio-day

Greetings Elmers! Seeking advice on buck converters.

I ordered a QRP Labs QMX. For this model, they are extremely specific that it must not be powered by more than 12V. This means a LiFePo4 battery is out. Unless of course I put a buck converter inline to ensure only 12V goes to the QMX. Since it's a QRP radio, it consumes roughly 1A max current.

Any advice on what buck converter options make the most sense here?

so, a few months ago I got an email from the local ARRL Bureau for QSL cards, and they said I had some waiting, so I sent them the $3 and waited... lol

I just got the mail today, and oh my gosh, there has to be 30 to 40 QSL cards for the past 5 years here! this is going to take some time to catch up on,

#WesternDigital to unveil 44TB #HAMR #HDD in 2026 (But not shipping in volume until 2027. )
100TB in 2030!
https://www.tomshardware.com/pc-components/hdds/western-digital-to-unveil-44tb-hamr-hdds-in-2026-100tb-in-2030

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

Sharing my friend's Top Of #Cycle25 excitement.

#hamr
#hamradio