433MHz vs 868MHz interference

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Jazzle
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433MHz vs 868MHz interference

#1 Post by Jazzle » 25 Feb 2018, 16:01

Hi,

since 2 weeks i have an RFLink 433MHz (next to my RFLink 868MHz and RFXcom 433MHz) because i like the developments done on RFLink software and theoretical support of some PIR's i have.

THe RFLink 433MHz does not pick up much, but since i have it connected to my RPi, i noticed my RFLink 868MHz picks up much more data.
Could this be coincidence and due to an update or something?

Just now i noticed it pick up a lot similar to the RFXcom, see screenshot:

https://pasteboard.co/H9hY0jf.jpg

I don't consider it a problem, since when i want to add any sensors placed by myself, i know whether it is a 433MHz or 868MHz, but i do wonder if i can do anything about it.

Has anyone of you ever exprienced similar?

Kind regards

Jazzle
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

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Stuntteam
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Re: 433MHz vs 868MHz interference

#2 Post by Stuntteam » 26 Feb 2018, 23:22

I That looks really strange and nothign like we see when testing 433 and 868 mhz together.
Did you set the USB persistent or could it be the USB is mixed up and you are in fact receiving data fro mthe 433mhz rflink?
-=# RFLink Gateway Development Team #=-
Introduction: http://www.nemcon.nl/blog2/
Generic Support forum: http://www.esp8266.nu/forum/viewforum.php?f=8

Jazzle
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Re: 433MHz vs 868MHz interference

#3 Post by Jazzle » 27 Feb 2018, 12:29

RFlink 433MHz on ACM1
RFlink 866MHz on ACM0
RFXcom 433MHz on USB0

see: https://pasteboard.co/H9zq9bDk.jpg

On RaspberryPi:
pi@raspberrypi:~ $ lsusb
Bus 001 Device 006: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 001 Device 005: ID 2341:0042 Arduino SA Mega 2560 R3 (CDC ACM)
Bus 001 Device 004: ID 2341:0042 Arduino SA Mega 2560 R3 (CDC ACM)
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

Jazzle
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Re: 433MHz vs 868MHz interference

#4 Post by Jazzle » 04 Mar 2018, 12:52

Any ideas anyone?
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

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Re: 433MHz vs 868MHz interference

#5 Post by Stuntteam » 05 Mar 2018, 00:16

How close are they to eachother?
It might be related to interference..
-=# RFLink Gateway Development Team #=-
Introduction: http://www.nemcon.nl/blog2/
Generic Support forum: http://www.esp8266.nu/forum/viewforum.php?f=8

Jazzle
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Re: 433MHz vs 868MHz interference

#6 Post by Jazzle » 05 Mar 2018, 23:01

About 1 meter, I have tried multiple positions and (shorter) distances now but doesn't seem to matter
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

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Re: 433MHz vs 868MHz interference

#7 Post by Stuntteam » 05 Mar 2018, 23:06

All devices are 1 meter from eachother?
-=# RFLink Gateway Development Team #=-
Introduction: http://www.nemcon.nl/blog2/
Generic Support forum: http://www.esp8266.nu/forum/viewforum.php?f=8

Jazzle
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Re: 433MHz vs 868MHz interference

#8 Post by Jazzle » 05 Mar 2018, 23:22

Yup, both as far as possible away from each other and the raspberry Pi, maybe 1m20. Is this too close? I have ordered extra long USB a to b cable for the rflink arduino already
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

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Re: 433MHz vs 868MHz interference

#9 Post by Stuntteam » 07 Mar 2018, 00:03

Main issue is that the Pi is creating a fair bit of noise.
Power supplies also often appear to do this.
1 meter apart is more than enough.
-=# RFLink Gateway Development Team #=-
Introduction: http://www.nemcon.nl/blog2/
Generic Support forum: http://www.esp8266.nu/forum/viewforum.php?f=8

Jazzle
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Re: 433MHz vs 868MHz interference

#10 Post by Jazzle » 28 Mar 2018, 19:39

Longer USB cables have arrived, distance from each unit to the Pi is now about 80cm, this works. Now only rarely notice a double reading
Domoticz @ Raspberry Pi 3 - RFXcom @ 433MHz - RFLink @ 868MHZ - ESP8266

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