If you have followed my hot-swappable series, my goal was to find a solution to swapping multiple outdoor AP + antenna combinations and a variety of AP models on the same tripod. What is the use case? I only wanted to carry a single tripod on the site survey day while still having the flexibility to survey with variety of antennas and different AP models.
Please excuse the DYI approach. I did this during UK’s second COVID-19 lockdown. Shops were closed, access to tools was limited and I had no access to my lab.
How it turned out?
It went surprisingly well this time as I’ve already built a similar adapter for Cisco Meraki MR APs and this time it was even easier. Same as last time, the alu tube slides inside the top tripod tube and we are ready to roll.
The actual steps
I stocked up on M6 x 30 mm bolts, cut the 16 mm aluminium tube to the right length and reused the last bit of decking from a different project.
I thought I will try making a template, which I then transferred onto the wood. That wasn’t the best idea and it seems to work best when you watch someone using this “trick” on YouTube. Next time I will go for an analog pencil and ruler, lesson learned;-)
The decking is quite thick so I ended up shaving few millimeters off it. And here is the final adapter.
I needed to find a solution to swapping multiple outdoor AP and antenna combinations on the same tripod. Specifically MR86 with MA-ANT-20 dipoles and MR86 with two MA-ANT-25 directional antennas. Quick swapping was a key requirement. Some coverage areas required directional pattern while other locations with low traffic and low client density would really benefit from omnidirectional coverage.
MRs ship with standard pole mounting hardware, which is great for permanent installation, but it didn’t allow fast swapping of the AP and antenna sets. Also, pole mounting kit requires tools, which is not practical as it add additional weight to your survey backpack.
Please excuse the DYI approach. I did this during UK’s second COVID-19 lockdown. Shops were closed, tools were limited and I had no access to my lab.
You are smart people, so I don’t need to stress this point, but please don’t take this write-up as Cisco’s official guide or recommendation. This is just me trying to find a solution to a problem.
So, what’s the solution?
Let me show you the final adapter and we can then look into the detail.
Under the hood
It all started when I spotted my wife’s aluminium 16 mm gardening tubes;-) I realised they were perfect fit for my tripod. They slide nicely inside the top tripod tube about a couple of inches (5 cm) or so.
What would I improve?
If I were to build a second iteration of this adapter, I would add a safety wire and attach the AP mounting bracket to the tripod. I would call this mandatory, especially if you are not the only user of these adapters or if there is going to be a person stood underneath the tripod.
Apart from that, it works really well, it is rock-solid, and allows me to swap the MR with omnis and MR with directional antennas in less than 10 seconds.
Many people are talking about the Ultra Wide Band (UWB) precision finding supported by AirTags and the last two generations of iPhones. It is possible thanks to Apple’s U1 chip. This feature on its own might quite likely be a good enough reason for many users to upgrade to the latest iPhone.
Since I don’t own iPhone 11 or 12, I was curious what the experience was from iPhone SE or XR user’s perspective. Due to the lack of the U1 chip, these phones don’t support UWB and “Precision Finding”. Instead, they use Bluetooth and “Proximity Finding”.
“With You” Bluetooth accuracy and audible alarm
When the tag is “With You”, that means that your iPhone or macOS device can hear the Bluetooth signal beaconed by the AirTag. In this mode, location accuracy seems to be around 10 meters (depending on where it is and if indoors or outdoors). The lack of the UWB support means that the SE or XR can’t detect the direction you or the AirTag is moving in.
Since the AirTags is “With You” (shown in the screenshot above) and is reachable via Bluetooth, you can activate the audible alarm and find its exact location this way.
Detached mode accuracy and refresh rate
When the AirTag becomes detached from your iPhone or macOS device (tag’s Bluetooth signal is lost), the tag then relies on other people’s iPhones and macOS devices. As soon as their device hears the Bluetooth signal of your lost AirTag, it relays (or reports if you will) the tag location to iCloud. Thanks to the crown-sourced relayed location, you will be able to see your tag’s current location in the Find My app although you are not anywhere the tag. The AirTag does not even have to be in the Lost Mode. Location finding works in its standard mode.
Location in the Find My does not update instantly. Based on my tests, it refreshes every 5 to 15 minutes.
When it comes to location accuracy relayed by other people’s iPhones and macOS devices, it ranges from approximately 10 meters to 110 meters.
Can Wi-Fi-only iPads relay location?
No, they can’t. I tested a couple of iPads connected to Wi-Fi with Bluetooth enabled and placed them in close proximity of the AirTag. They did not relay location. As far as I can tell, only iPhones and macOS devices can relay location of a tag.
Can cellular iPads relay location?
I don’t know. Please test it if you have one and tell me;-)
In the unfortunate event of losing your item, you can switch the tag to the “Lost mode” and receive a push notification whenever the AirTags gets automatically reported by someone’s iPhone or macOS device.
When that happens location, you receive a notification. Currently, there seems to be a cosmetic bug as the text of the notification does not show the latest location of the tag, but its previous location. When you open “Find My” app, you will see the correct and latest location though.
My test setup
iPhone SE 2nd generation running iOS 14.5
MacBook Pro running Big Sur 11.3.1
iPad Mini 5th generation running iOS 14.5
iPad Air 2nd generation running iOS 14.5
What is your experience with AirTags?
I am curious what your experience was. Have you tested any other scenarios? Have I missed anything. Please do let me know in the comments and I will update the post.
As I mentioned in my battery pack review, I am fortunate to rely on our field engineers and partners when it comes to predictive design validation, wall measurements and AP on a stick surveys. Having said that, I enjoy going on site a few days a month and staying close to our projects. Which leads me to yet another blog post from the “affordable series”;-)
This time I tested 3 tripods. Key factors I considered were value for money, build quality, and suitability for outdoor surveys ability to hold anything from an indoor or outdoor AP to a camera.
Unstable, too light, loose locking mechanism, unsuitable for holding APs
Great value for money, rock-solid, tall, heavier
I decided for tripod (C). It is high enough for outdoor surveys, rock-solid, and very stable. I also built an adapter that allows me to easily mount any outdoor Cisco AP (Catalyst, Aironet or Meraki MR). Here is more about my outdoor Meraki MR universal tripod adapter. Stay tuned for the Aironet and Catalyst one.
The only downside is its weight. Also, watch out for packaging. The first one I ordered arrived with the bottom of the box open and the head, where you insert the 1/3″ and 3/8″ adapter, was damaged. So, it took one return to get an undamaged one.
All three tripods are supplied with 1/4″ to 3/8″ adapter.
Since I don’t survey every day, I could not justify the purchase of a full-blown battery pack. My goal is to get a universal battery pack, which would allow me to survey for 5 hours and provide power to my laptop or USB device (like the WLAN Pi) at the same time.
The 2 built-in fans kick in when AC device starts drawing more than 20 Watts. Below this threshold, the fan is off. With the fan on, it actually becomes annoyingly loud (watch this video).
The AC inverter seems to operate with 82% efficiency
MacBook Pro 61 Watt power brick charges the battery using USB type C port
It powers USB devices and 230V AC devices (power injector in my case)
Capacity of 99.9 Wh
Things I like about this battery pack:
It is universal and power USB and AC devices
Its size and capacity are great
Things I don’t like:
When AC load exceeds 20 Watts, the 2 fans become generate significant noise
The adapter from its AC socket to UK socket is really poor, does disconnect very easily and cuts power. This is a huge downside.
AC power automatically switches off when the connected device draws less than 8 Watts or so. If you need to power a very low power device, use the USB port or plug one more device in to increase total load.
Battery life tests
I tested a few access points powered by a PoE+ 802.3at injector:
Cisco Catalyst 9115 in site survey Embedded Wireless Controller mode stays powered for 6 hours and 24 minutes and draws around 13 Watts.
Cisco Aironet 1560I (in 2SS only mode) in Mobility Express site survey mode stays powered for 5 hours and 28 minutes and draws around 15 Watts.
Formula to estimate battery life
Cisco Aironet 1540I draws around 8 Watts (measured by a smart plug) and estimated battery life is:
Run time = Battery capacity in Wh * Battery inverter efficiency / Power drawn by device in Watts = 99.9 * 0.82 / 8 = 10.2 hours
Tested devices powered by AC power
MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports) powered using MacBook 61W USB-C power adapter connected to the battery pack charged the laptop with no problem. The only annoyance is the battery fan noice. I can’t imagine using this in an open plan office as it would disturb others. Charging while on site or in a car is not a problem.
I was able to power Cisco WLC 2504 and 3504 with no problem at all and they drew around 25 Watts. You can use the above formula to calculate estimated battery life.
Cisco Catalyst compact switch WS-C3560CX-8XPD-S is not able to be powered by this battery, the battery goes into overload mode and cuts power. I suspect the AC wave output of the inverter is far from “perfect sine” and it prevents some devices to be powered. A different battery pack with better filters would be my suggestion if you need to power a device like this.
Another Cisco Catalyst compact switch WS-C3560CG-8PC-S works perfectly fine and draws about 17 Watts with no Ethernet ports connected and no PoE provided to its downstream devices.
Maximum AC load test
It tried connecting as many devices to the battery pack and power them using the inverter. These devices can be powered concurrently just fine:
Cisco Meraki MS220, Cisco Small Business SF100-08P switch, Aironet 3800 AP, Catalyst 9105AXI AP, Aironet 1800S Wi-Fi active sensor, Aironet 1560I, MR32 AP, MR20 AP, Aironet 1815W, a Bluetooth speaker and Raspberry Pi 4
How I fixed the supplied AC adapter issue
As I mentioned, the provided power adapter is a joke and not fit for purpose if you want to connect a device using a UK power plug. Just the weight of the power cable itself pulls the adapter from the battery pack socket and stops power supply to the connected device.
Tentokrát jsem se pustil do otestování externího disku WD MyPassport Essential 500 GB. Zajímalo mě, jakým USB konektorem je osazený, jaká je reálná přenosová rychlost USB 3.0 a jestli jde použít i jiný kabel, než ten, který je součástí balení. Výsledek si můžete prohlédnout v tomto videu.
Disk je předformátovaný systémem NTFS. Neobsahuje virtuální CD-ROM mechaniku se SmartWarem, což jistě oceníte. Nebylo to zrovna šťastné řešení.
Po připojení USB 3.0 kabelem do USB 3.0 portu počítače se rychlost čtení z disku pohybuje okolo 70 MB/s. Disk můžete spojit s PC také standardním MicroUSB kabelem. Potom nezávisle na tom, zda je váš počítač vybaven USB 3.0 portem či nikoliv, dosahuje rychlost přibližně 30 MB/s. Týž výsledků jsem dosáhl i reálným kopírováním velkého souboru ve Windows, takže nejde jen o teoretická čísla.
Pokud to jen trošku jde, používejte USB 3.0 port počítače a dodávaný kabel. Tím z disku dostanete maximum. V případě, že tento kabel zrovna nemáte při ruce, poslouží vám za cenu nižší rychlosti (USB 2.0) i obyčejný MicroUSB kabel.
Tentokrát se mi dostal do rukou největší zástupce nové řady notebooků Lenovo Edge. Tato řada má za cíl oslovit především domácnosti a malé firmy. Čekat v podstatě můžete “téčkový” model, který postrádá některé pokročilé funkce.
Přizpůsobit se musela například klávesnice, která obsahuje multimediální funkce mapované na klávesy F1-F12. O tom, jak vrátit klávesám F1 až F12 jejich původní význam, se dozvíte ve videu. Notebooky rodiny Edge postrádají vstupní konektor pro připojení externího mikrofonu. K dispozici je tedy pouze ten integrovaný do víka notebooku vedle kamery. Pořízený záznam je ale překvapivě kvalitní, takže ze Skypování a podobných činností rozhodně nemusíte mít obavy.
Ve víku notebooku také nenajdete integrovanou diodu pro přisvícení klávesnice. Příjemné změny se ale dočkal TrackPad, který je u těchto modelů větší a nechybí ani TrackPoint, jaký mají všechny vyšší řady ThinkPadů.
Celkově tento stroj působí velmi pevně a robustně, má dostatečně výkonnou konfiguraci, skvělou klávesnici, standardní napájecí adaptér a LED podsvícení displeje podává příjemný obraz.