Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




19631 posts

Uber Geek
+1 received by user: 3474

Trusted
Subscriber

Topic # 112078 25-Nov-2012 20:31
Send private message

I got 2 sets of these, they are a reciver with LCD and 3 plug in transmitters - http://www.jaycar.co.nz/productView.asp?ID=MS6116 

Anyway, they are a totally irresponsible user of the 433MHz band with the way they work.

Every 6-7 seconds or so they transmit for a second, totally hogging the 433MHz band. To the point where my weather station sensors are not displaying most of the time, and it even takes a couple of trys to get other things to work. As my wireless IR repeater is also 433Mhz it means that most of the time is is blasting out a useless stream of data making remotes not operate too well.

I only just noticed this when I was trying to make another reciever for them to send the values out to cosm to get charted. They are transmitting any time the LED on the front is lit up. I thought that was just to show it was logging or something, not having close to a 20% duty cycle on its transmissions.




Richard rich.ms

Create new topic
2332 posts

Uber Geek
+1 received by user: 80


  Reply # 722703 25-Nov-2012 21:01
Send private message

Ouch! Do you have a SDR that you could use to see exactly what they're doing?



19631 posts

Uber Geek
+1 received by user: 3474

Trusted
Subscriber

  Reply # 722716 25-Nov-2012 21:24
Send private message

No, but I have taken the output of my IR repeater into my soundcard to get a waveform. Its huge tho I will try soundclouding it, not sure how well it will work since I think they transcode it to something lossy.

http://soundcloud.com/user9568544/powermeter-grab

The IR remote repeater adds a 40ish kHz carrier to anything it recieves, the powermeter is right at the end, my rain gauge is what is on the other channel.

Looks trivial to decode but I have an issue that if I have my arduino connected to the computer it gets a massive amount of noise on the 433MHz reciever on it, and I cant find my bluetooth bee to connect wirelessly.

The end constant height bit is one of the transmissions from the wireless power meter. I am doing this out in the garage whcih is out of range of the ones in the house so there is some hope to monitor stuff in both locations, one with each set.




Richard rich.ms

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Whatever ailed Vodafone broadband … seems to be fixed
Posted 23-Jun-2017 14:10


VMware NSX Meets Stringent Government Security Standards with Common Criteria Certification
Posted 22-Jun-2017 19:05


Brother launches next-generation colour laser printers and all-in- ones for business
Posted 22-Jun-2017 18:56


Intel and IOC announce partnership
Posted 22-Jun-2017 18:50


Samsung Galaxy Tab S3: Best Android tablet
Posted 21-Jun-2017 12:05


Wellington-based company helping secure Microsoft browsers
Posted 20-Jun-2017 20:51


Endace delivers high performance with new 1/10/40 Gbps packet capture card
Posted 20-Jun-2017 20:50


You can now integrate SMX security into Microsoft Office 365, Google and other cloud email platforms
Posted 20-Jun-2017 20:47


Ravensdown launches new decision-making tool HawkEye
Posted 19-Jun-2017 15:38


Spark planning to take on direct management of all consumer stores
Posted 19-Jun-2017 10:03


Qrious acquires Ubiquity
Posted 14-Jun-2017 12:21


Spark New Zealand prepares for 5G with Nokia
Posted 14-Jun-2017 12:16


The future-proof 10.5-inch iPad Pro
Posted 13-Jun-2017 18:16


Mandatory data breach reporting in Australia
Posted 13-Jun-2017 11:30


Review: Sony MDR-1000X noise-cancelling headphones
Posted 12-Jun-2017 08:08



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.