Tagged: Ku Band

Othernet Sale: $75 Dreamcatcher LoRa Radio, $99 moRFeus Signal Generator

Othernet (previously known as Outernet) are currently having a 50% off sale on all their products. This means that you can snag a discounted Dreamcatcher at only US$75, and a moRFeus at US$99. The sale expires midnight on the 26th.

The sale is exclusive to RTL-SDR Blog readers (although feel free to share the coupon) and the coupon code to use at checkout is rtlsdrblog83759

Dreamcatcher and Othernet Data Signal Information

If you weren't already aware, the Othernet project aims to bring live data such as news, weather, video, books, Wikipedia articles and audio broadcasts to the world via a free satellite service and cheap receivers. Although an internet connection provides the same data, Othernet's satellite broadcast is receivable in remote areas, will continue working in disasters, and costs nothing to continually receive roughly 200MB of data a day. The trade off is that the service is downlink only, so the data that you get is only what is curated by the Othernet team.

Othernet can provide this service for free because they are funded by private customers whom they provide private data/audio satellite channels to. One such private customer is attempting to implement an Othernet based Tsunami early warning system in Vanuatu which would work even when the cell phone system fails in a disaster. Each siren is equipped with an Othernet receiver and LNB that receives the Othernet signal. The goal is to allow for any village to be able to set up their own low cost warning system. At the same time the Othernet Tsunami warning receiver is made use of in normal circumstances as it receives a satellite radio broadcast which is then re-transmitted to the village over regular FM radio.

Currently the public service is in a test period and is only available in North America, but public service for the EU and possibly Oceania is planned to begin in Q1 2019. The rest of the world should eventually follow after. Some more information about the data service can be found on our previous post.

Alternatively, if you have no interest in the data service then your Dreamcatcher could also be used as a TX/RX capable LoRa radio. In a previous post we had some fun with two Dreamcatchers and a LoRa chat application.

Outernet Dreamcatcher - Precursor to the Lantern
Othernet Dreamcatcher

moRFeus Information

The moRFeus is a low cost signal generator. It's capable of generating a tone anywhere from 85 MHz to 5400 MHz, and it can also be used as a frequency mixer component for implementing things like homebrew upconverters and downconverters.

In the past we've seen it be used as a tracking generator for measuring filters and VSWR, and users from the Othernet community have implemented custom GUIs to control it. Recently @sam210723 released a new very slick looking GUI too.

moRFeus Signal Generator
moRFeus Signal Generator

Othernet (formerly Outernet) Updates Lantern Backers

Othernet (formerly known as Outernet) are a providers of a free data service broadcast from satellites. They hope to build a system and low cost satellite receiver products where people can easily stream free daily data such as news, videos, books, and live audio down to a computer or phone from anywhere in the world via a device called a Lantern. It is a one way download only service, but may be useful for those in areas with limited internet, disaster preppers, or people in countries with internet censorship. The describe their mission as:

Othernet's mission is to build a universal information service; a truly pervasive multi-media service that operates in the most remote places and functions even when nothing else does.

In the past they ran a trial service on L-band satellite frequencies and used RTL-SDR dongles as the receiver. They have since discontinued that service in favor of a new Ku-band LoRa based service which can provide much more data - up to 200MB a day. The update released today was sent to Lantern backers, which was the receiver they crowdfunded for in their Kickstarter back in 2014. The update notes that the final iteration of the Lantern is close to being ready.

Broadcasting Khan Academy 24/7

Hello Backers,

Yes, we are still here. It’s been a long while since the last update, but that does not mean we have stopped–or even slowed–working on Lantern. We have been making progress, though it has been much, much slower than what everyone wants. Fortunately, we are in the final stage of development.

The last update described the new network technology we had developed. Our original goal was to broadcast 20 MB of content per day, which is what we were doing with our previous network. The new system is operating at 10-times that speed, which is a little over 20kbps and 200 MB of content per day. Some of the work we’ve been doing over the past few months is related to tripling our current download speeds. Our target is 60kbps, which results in over 600 MB per day. The size of the device will be similar to a standard flashlight.

At our current download speed of 20kbps, we are broadcasting both data and a 24/7 audio stream. I know many of you were interested in the educational applications that were highlighted during the campaign, which is why I’m very pleased to share that we are currently broadcasting the entirety of Khan Academy as a 24/7 audio stream. The Khan Academy library consists of over 900 separate lectures, which we’ve turned into a giant audio playlist. Now we just need to get Lanterns into everyone’s hands.

The next update will include a picture of our final antenna design. The antenna that is currently included in our DIY kit is 2-inches/5-cm across and the shape of a cone. We are trying to flatten the cone and also increase the size to about 4-inches/10-cm, which is what allows for greater download speeds. Since we are operating at microwave frequencies (12 GHz), both the design of the antenna and the parts to convert the high frequency to a lower one are pretty tricky. Microwave engineering is widely considered black magic, which is the main reason for the long break since the last update. We are close to turning the corner and are targeting the end of the year for our initial production run.

Unrelated to our technical work is our recent name change. We had been fighting a trademark issue for the past four years. We recently decided that it made more financial sense to change our name, rather than continue spending legal fees to defend our position. We are now Othernet (http://othernet.is). This name change does not mean we are going away, nor does it mean we are not delivering Lanterns. It’s just a legal hiccup.

Thanks for your patience and support while we get through the final stage of building what you all backed several years ago. I know it’s been a long time and we are making every possible effort to deliver something that exceeds everyone’s original expectations. Although it’s taking three times longer to develop and ship the product, what we now have will be ten-times more useful.

Outernet Dreamcatcher - Precursor to the Lantern
Outernet Dreamcatcher - Precursor to the Lantern
 

Outernet 3.0 Coming Soon: Free 30kbps – 100kbps satellite data downlink for news, weather, audio etc

The new Outernet Dreamcatcher v3.01
The new Outernet Dreamcatcher v3.01

Over the past few years we've posted quite a bit about Outernet who offered a free downlink of satellite data such as news, Wikipedia articles and weather updates that was able to be received with a small L-band patch antenna, LNA and an RTL-SDR dongle.

Recently we've seen news on their forums that Outernet is planning on discontinuing their L-band service, and instead opening up a new much more efficient Ku-band service. Unfortunately that means that RTL-SDRs and the previous Outernet L-band hardware will no longer be useful for the downlink, but the new service appears to offer several significant advantages.

Firstly the downlink data rate is much higher at 30kbps, with the plan to eventually go up to 100kpbs. That's 300MB - 1 GB a day which is a lot more compared to the previous L-band implementation that gave less than 20MB a day.

Secondly the hardware seems to be simplified as well. All that is needed is their new Dreamcatcher V3 receiver board and a small Ku-band LNB (11.7-12.75 GHz). They claim that no dish is required as the LNB pointed at the satellite by itself will work just fine. The first iteration of Outernet also used Ku-band satellites, but required a large dish antenna to receive it which was a major hurdle to user adoption. They now appear to have discovered a new way to broadcast in the Ku-band without the need for a dish.

Thirdly, moving to Ku-band means significant cost savings for Outernet allowing them to survive and continue with their free data service. From what we understand the L-Band satellite downlink service is extremely costly to run, whereas a Ku-band service is much cheaper. There are also cost savings for the user as Ku-band LNBs are very common hardware that can be found cheaply for $10 - $20 US.

About the new services that they can offer and the cost savings that they can achieve Syed the CEO of Outernet writes:

The fatter pipe [300MB - 1GB] makes a lot of things possible, one of which is a true radio broadcast. How about a national radio broadcast that isn't SiriusXM? Our new receiver will include a speaker; audio through the speaker while files download in the background. But more data is not the most important thing that comes out of all this. The real win is that leasing standard, commodity Ku bandwidth is far, far more cost effective than the few kilohertz we have on L-band. Long-term sustainability of a free broadcast is no longer the financial burden that it once was--especially considering how much more interesting the service becomes.

There is no concrete hardware release date just yet, but on the forums Syed estimates mid-Jan. You can sign up to the Outernet mailing list on their buy-now page to be emailed when the new hardware is released. In the forums Syed also writes that the target price for the hardware is $99 US, with the intention to provide lower cost options in the future. Of course it might still be possible to DIY your own unit just like it was with the previous Outernet iterations.

We're really looking forward to this and think that this is what will finally make Outernet a very popular and useful service!

The Outernet 3.0 prototype setup
The Outernet 3.0 prototype setup

Rain Scatter 10 GHz Reception with the RTL-SDR

YouTube user feri67000 who last month showed us that the RTL-SDR can receive 10 GHz signals with a cheap avenger LNB PLL now shows an interesting experiment where he uses a technique known as rain scatter to receive a 10 GHz beacon with his satellite dish pointed in the opposite direction of the beacon transmitter.

Usually communications at 10 GHz are line of sight only, but by using the rain scatter technique, the 10 GHz signal can be bounced off a precipitation cloud and received with line of sight to the cloud, rather than the transmitter.

rain scatter 10ghz LX1DB beacon

Receiving a 10GHz Beacon with RTL-SDR and an Avenger LNBF

In this video YouTube user feri67000 shows reception of a 10 GHz amateur beacon over 26km using the RTL-SDR, and an ‘Avenger LNBF‘, which we believe is this one which only costs $11. The LNB within the Avenger antenna converts the 10 GHz signal into a frequency that is receivable by the R820T RTL-SDR.

F0EQE reception F5ZWZ/b 10GHZ beacon rtl sdr R820T + SAT LNB PLL Avenger

Also, in this video by YouTube user EA5KGD reception of a voice signal is shown using the RTL-SDR and Avenger LNBF.

SDR RTL 2832U E4000 RX EB5EA on 10GHz beside Avenger LNB PLL (part 1)