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.



11117 posts

Uber Geek
+1 received by user: 545

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
2329 posts

Uber Geek
+1 received by user: 79


  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?



11117 posts

Uber Geek
+1 received by user: 545

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:





Trending now »

Hot discussions in our forums right now:

Who Audits IRD?
Created by gundar, last reply by charsleysa on 22-Oct-2014 15:52 (18 replies)
Pages... 2


22nd Only: PB Tech BROTHER HL1110 Mono laser Printer $15 shipped(after $30 cashback)
Created by loceff13, last reply by Jaxson on 22-Oct-2014 15:44 (17 replies)
Pages... 2


American legal jurisdiction in New Zealand
Created by ajobbins, last reply by gzt on 21-Oct-2014 14:58 (30 replies)
Pages... 2


Another Trade Me competitor: SellShed
Created by freitasm, last reply by SellShed on 22-Oct-2014 11:54 (42 replies)
Pages... 2 3


Spark Socialiser
Created by freitasm, last reply by old3eyes on 22-Oct-2014 10:37 (26 replies)
Pages... 2


Snap have failed our company!
Created by dafman, last reply by toejam316 on 22-Oct-2014 13:03 (25 replies)
Pages... 2


Overcharged by Slingshot for months - warning to existing customers
Created by dusty42, last reply by DravidDavid on 22-Oct-2014 16:11 (35 replies)
Pages... 2 3


Abnormal upstream data usage - Vodafone Cable Wellington
Created by otherside, last reply by freitasm on 22-Oct-2014 15:33 (11 replies)


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.