Monday, October 23, 2017

Run your own Web SDR with OpenWebRX on Raspberry Pi

There's quite a few excellent remote receivers running WebSDR but unfortunately the author has decided only to give the software to agree to make their server publicly available. I think it's a pity that this software is not available for people wanting to share their home receiver with, perhaps, a few friends. It's also a pity that this software isn't open source.

An alternative is the excellent OpenWebRX by AndrĂ¡s Retzler.

In the ARNSW home brew group we have a regular contact on 80 or 40m but often we can't hear each other due to local noise. It's been proposed that we place a remote receiver at a low noise location and all listen over the web. One idea is to have a fixed receiver simply stream the audio, another is to set up a web SDR. I'm investigating running this on a Raspberry Pi.

The software is available from GitHub here.

There's a few dependencies summarised here:

  • git clone
  • sudo apt install rtl-sdr
  • sudo apt install libfftw3-dev
  • sudo apt install libusb-1.0-0-dev
  • sudo apt install cmake

Everything is in the readme to build and install, I did little except follow the instructions and install missing things as they came up. Let me know if you're stuck.

Because I'm currently running an RTL-SDR in direct sampling mode I had to build a fork of rtl-sdr that supports this.

OpenWebRX is a terrific piece of software, easy to build and run, and I want to thank Andras for his contribution. If you do have a fast internet upload and a permanent receiver you can add yours to the list.


The RTL-SDR doesn't work very well on HF like this so I've now switched to using a HackRF One that's working quite nicely.

The AGC is rather savage but it's good to listen to overall.

Sunday, October 22, 2017

QRP by the Harbour - Late 2017

Under threatening skies we had a second "QRP by the Harbour" event in Sydney today.

Facebook worked well to coordinate and publicise the event.

I set up a simple wire dipole fed with just the twin figure eight line and had contacts including local and one into VK4 which was about 800km away.

John, VK2ASU, ran up an end fed antenna high into a tree and had multiple contacts with a Bitx40.

Peter, VK2EMU, set up a magnificent flag pole mast that I think was mostly to mark our location.

Despite good weather at the start it soon turned dark and in the end we faced driving rain and then hail which led us to abandon our position and adjourn to a nearby cafe.

Some lessons were learned for next time:

  • Start earlier in the day - 3pm was late and so many came early
  • Nominate a 2m Simplex frequency for liaison - at least three people turned up but couldn't find us after we'd escaped the waterfront. (I'm very sorry about this).
  • It's tough having multiple stations on the same band, or even harmonically related bands. Maybe we should consider having one main station?

Friday, October 20, 2017

iPhone to Pixel 2 - what's better, what's worse?

After a few days I'm well in to the new world, for me, of Android Oreo on a Pixel 2. I've kept a list of observations (in Google Keep) of what's better, worse, and what I miss.

What's better

  • Shows incoming call may be spam and lets you confirm or not
  • Launch camera by double tapping the power button (Pixel 2)
  • Ability to not lock when connected to trusted bluetooth devices
  • Front facing stereo speakers on the Pixel 2
  • Great that the Google Home Mini that comes with the Pixel 2 at the moment works as a Chromecast audio device.
  • Works better with Philips Hue lights than going via HomeKit which is a little unreliable for me
  • USB-C. I want this everywhere.

What's worse

  • Don't like some android apps have bumpy animation flashes, even native Google software like play store installs.
  • Front facing speakers on the Pixel 2 aren't so good when I listen to podcasts with the phone in a shirt pocket.
  • Don't like how some apps re-open rotated
  • Facebook chat heads appeared. Happily Apple doesn't allow that.

What I miss

  • Apple watch
  • Airdrop
  • Continuity (copy on computer, paste on phone)
  • Apple Reminders, am using Android Tasks
  • Apple Notes, using Google Keep and chrome extension on macOS
  • Reeder RSS reader, am using TTRSS client
  • Overcasts, using PocketCasts
  • Find my friends, could use Google Maps
  • Fitbit being able to use the step counter in the iPhone, using Google fit but I miss the competition with family
  • Safari not auto-playing videos with sound (coming in Chrome)
  • Spotlight search to launch apps by pulling down on any screen.


  • Deactivate iMessage association with my phone number  (Thanks Jason and Gavin for the tip)
  • I'm looking for a way to import notes into Keep
  • Why do apps in the Google Play store need to be verified with Play protect on device?
  • Android Studio looks nice but HAXM (required to emulate Android O) isn't compatible with macOS 10.13 yet, even in the Beta version.
  • Backup doesn't work. When I decided to switch to the other review phone, the XL, I found that App data, messages etc were all "waiting for backup" on the first phone. This seems to be a known issue that currently doesn't have a fix.
  • I was tricked by a fake Messenger app called "Messenger" with a very similar icon to the Facebook one that showed me full screen ads before bouncing over to the real app. No idea what other terrible things it might have done. I'm not alone.

Wednesday, October 18, 2017

Pixel 2 review from an iPhone tragic

Our family is very much in the Apple eco-system. We iMessage, FaceTime, iPhoto, and watch AppleTV. The family uses Find my Friends and we even have an iCloud cache set up in the house. All said and done, the eco-system mostly “just works”.

But Apple doesn’t meet all our needs and the gaps have always been filled by Google services. We all use gmail and appreciate the huge storage, great search and lack of spam. Photos are backed up to Google Photos and videos are shared on YouTube (I also pay for YouTube Red to avoid those annoying pre-roll and floating ads).

In recent years, Google’s ecosystem has expanded in our world. A Google Home device has become a valued part of our lives in the kitchen, mostly for little things like cooking timers, temperature and weather predictions, some background music and the answers to questions about when a store is open.

Aside from the proprietary Apple iPhone apps, the most used apps are identical on iOS and Android. Facebook, Twitter, Instagram, Tripview, Fitbit and Whatsapp. Transitioning from Apple’s Contacts, Calendar and Photos shouldn’t be too hard...

Physical impressions

The Pixel 2 is a well manufactured device with a feeling of quality about it. It’s just slightly wider and taller than an iPhone 6s but feels lighter in the hand. It turns out to be the same weight as the iPhone at 143g so the lightness is an illusion.

The head and chin are large and the top and bottom speaker slots make it rather hard to pick which way is up - you have to look for the selfie camera or USB-C socket to figure it out.

The screen is super clear although note that it’s set to “Vivid colours” in the settings by default so I wonder about colour accuracy.

The fingerprint reader on the back feels odd at first but I’m getting used to it. When used with a case the reader is rather deeply in a hole which makes it a little hard to poke. There is space for a reader on the “chin” area below the screen so it’s strange that they’ve kept it on the back. Perhaps edge to edge is on the way.

Fingerprint reading is very fast but sometimes fails to read whereas my impression is that the iPhone keeps trying longer. One drawback of the reader being on the back is that you can’t unlock the phone by fingerprint when it’s lying on a desk and must revert to PIN unlock like an animal.

The camera bump on the back is wider than on an iPhone but about the same depth, overall it seems less dramatic because of that width. Given that most people put the phone in a case the bump doesn’t end up being much of an issue.

The review unit came with one of the fabric style cases which is nice and grippy in a top pocket although rather thick.

USB-C is a big win, great to share chargers with laptops, despite some criticism about the varying capability of USB-C sockets and cables it’s a pity Apple won’t be able to move from Lightning cables for fear of a mass uprising for at least a decade.

Apple took the initial heat for dropping the headphone jack but now Google has followed suit. There’s a dongle supplied but the success of today’s wireless headphones show that the era of getting tangled in earphone cables is happily coming to an end.

Migrating from iPhone

In the box there’s a USB-A to USB-C adapter and if you elect to transfer from an iPhone you are instructed to plug your unlocked iPhone in via its lightning cable. When connected, the iPhone believes it’s been connected to a computer presumably running iTunes and asks you to “trust the computer”.

Taking this path of migration ended quickly for me as I have backup encryption enabled on the iPhone so the migration software informed me that only photos, music & videos would be migrated and as I already sync photos to Google this seemed redundant so I skipped it and just logged in with my Google account.

Downloading my apps took about ten minutes followed by 14 updates to pre-installed apps that took another ten or so.

The default screen sleep time was set to 30 seconds, rather fast during initial setup.

What I’ll miss leaving the iPhone for Android

While my email, contacts and photos are already synced to Google, I’m a heavy user of Apple Notes and Messages. Google has Keep for notes and messages is fragmented across Facebook messenger, WhatsApp, Google Allo (they hope), Google Duo, Microsoft Skype and various others. SMS feels like an archaic mode these days but it will do.

Thinking about my iPhone use in recent years, there’s a lot of Google services which have become the daily “go tos”, even Apple recently switched back to Google search from Microsoft Bing and I’m a big fan of Google Photos with its ability to find images by description is second to none.

The main day to day annoyance will be other iPhone users who try to send me an iMessage only to have it mysteriously fail.

Battery life

With only one day with the phone it’s a little hard to tell but so far it looks excellent. I first gave the phone a charge for about 20 minutes then started the install process. During that time it reported battery at 80% with about 13h 17m remaining at current usage (which would be high due to all the updates).

Later, after heavy use, battery was at 65% with 10h 47m remaining.

2h 48m after the charge, it’s at 60%, about 10h 0m remaining, which indicates to me that this phone will have excellent battery life in normal operation.

The GPS seems particularly sensitive and could use 14 satellites quickly on the ground floor of a two story house.


If software is eating the world, then smartphones are eating our gadgets. Car GPSs, music players, games machines and most of all cameras have been taken over by smartphones.

The camera in the Pixel 2 is stunning. It’s helped by the bright high resolution screen but really it’s the machine intelligence that focuses on the right thing, adjusts the light and has portrait enhancing tricks built right in.

Best of all it’s very fast.

Android Oreo

There’s no doubt that Android has come a long way. Oreo is slick with pleasing animations and loads of useful gestures and usage tips as you go. The Google Play store has misleading app titles and the fact that Android scans apps for malware, rather than making me feel safe, makes me a bit nervous.


Speaker audio is not as good as Apple phones which is strange as they have huge slots top and bottom.

The squeeze to trigger Google Assistant seems rather stiff to use, although it’s configurable, and note that you need to squeeze the lower half of the phone - a fact that’s not too clear in the setup animation. I’d like to be able to squeeze to launch the camera instead.

The always-on display of time, notifications and currently playing song is nice but its presence in the battery settings where it’s called “Ambient display” makes it clear that there is a power impact.


Our smartphones are the most used devices in our daily lives and the price should be amortised over the two to three years of heavy use they get. The 64GB Pixel 2 will sell in Australia for $1,079 which is exactly the same price as a 64GB iPhone 8.

The Pixel 2 has more RAM than iPhones but for reasons that aren’t totally clear Android needs more memory than iOS to perform as well.

Despite Google’s stated view that the Pixel 2 is the equal or better than equivalent iPhones it’s clear from Geekbench 4 measurements that they are no match for Apple’s custom A11 CPU.

iPhone 8 single-core: 4252 multi-core: 10201
Pixel 2 single-core: 1914, multi-core 6297
(Higher is better)

Of course, it’s not just about MHz and GB, the machine learning intelligence that Google builds in to both devices and the cloud that backs them makes all the difference in daily use. Being able to search your photos for “betty hugging a dog” is not affected by CPU speed but rather by cloud smarts.

If you live in the Google ecosystem then this is a terrific phone and, coming direct from Google, is sure to get security and software updates faster than third party Android hardware makers. If you’re an Apple tragic then you might be best to stay put.

Pixel 2, and the larger Pixel 2 XL model, will be available in Australia late in October.

Sunday, October 08, 2017

Tesla Tiny House - disappointing

Tiny houses are fascinating examples of efficient, frugal, tidy living and I was excited that the Tesla Tiny House was coming to Lane Cove near me this weekend.

This was not what I expected. Rather than a house, it is a box, with a battery, some panels on the roof and a salesman inside. Disappointing.