Expanded mmWave Support for iPhone 13 5G

Apple’s September 14th event introduced the new iPhone 13 and what caught my attention was a brief mention by Tim Cook of “new bands and antennas” for the iPhone 12 successor. Looking more closely at the specs shows that the iPhone 13 adds support for 26 GHz mmWave (n258), which builds on the 28 GHz and 39 GHz support (n261 and n260, respectively) my iPhone 12 Pro Max has.

I spent a lot of time characterizing mmWave performance during my LMDS days at Wavtrace, and I can tell you that rain and foliage are not kind to the higher frequencies, so the inclusion of 26 GHz in the new phones should make mmWave 5G more likely to work well especially as Seattle turns toward the rainy season.

Ah, Wavtrace. Good times that ultimately weren’t meant to be as LMDS never got a foothold.

I’m going to have to write a post about my experiences in mmWave work there. Will do so soon.

Returning to the Apple event, I was also happy to hear that the 13 would have extended battery life. Always a good thing for wireless/mobile devices 🙂

Net net: Nice to see the band getting use finally.

My LiveWire is Due for Its 1K Service

It’s an electric motorcycle… but it still needs an oil change 🙂

The spiral bevel gear primary drive (that rotates the motor output through 90 degrees to the belt drive) gets a special gear oil replacement after the first 1000 miles. Here’s a cool video of what my LiveWire, “ELVIRA” will be getting done next week:

ELVIRA” – see what I did there? 🙂

Swarm – Space Based IoT Connectivity has a Dev Kit Now

Now this is interesting. Was reminded about it on the IoT Podcast this morning.

From IEEE:

Swarm, a satellite start-up that uses CubeSats about the size of a grilled cheese sandwich to provide IoT coverage, has instead developed a satellite network specifically for IoT networks that would otherwise struggle to connect to the Internet. To do so, the company has adapted the popular IoT wireless technology LoRa, turning it into a high-flying—and even longer-ranging—solution.

https://spectrum.ieee.org/swarm-takes-lora-skyhigh

And now there is a developer kit! Will have to look closer at that 🙂

Photo credit: Swarm

STM32WXX Project

I’ve been working on a ARM Cortex M4 based weather station with APRS transmitter as part of my Masters in Electrical Engineering at the University of Washington. I’m making good progress. It is FreeRTOS based and I’ve gotten all the tasks and queues running and time, location, and weather data flowing. I integrated with the real time clock just to find out that it drifts 5 minutes per hour – looks like I’ll need to periodically re-synchronize that with the GPS signal, LOL.

This is a complete rebuild of the Texas Instruments Tiva based project with a better  sensor for weather and an MCU from the much more popular STM32 family.

Next step is to write an AX.25 packetizer and the modulator. You can follow my progress here or on GitHub: https://github.com/allendav/STM32WXX