FYI: Publicity has -sigh- again arisen here in NZ when car remotes refused to operate in a shopping mall carpark. Management declared it an "electrical incident", but it's probably 433MHz band interference.
https://i.stuff.co.nz/waikato-times/news/300493754/mysterious-carlocking-block-at-hamilton-shopping-centre-due-to-an-electrical-incident
Here's an earlier incident => https://i.stuff.co.nz/national/106902631/dozens-locked-out-of-car-in-invercargill-cbd-because-radio-equipment-blocked-car-remotes
Radio amateurs ("Hams") have primary use of the frequency range 433.050 to 434.920MHz as part of their wider 430-440 (or 420-450) MHz "70 cm" band entitlement. Transmitter powers of 10s of Watts are permitted. Commercial services also may use this slot.
Many car door remotes operate under SRD (Short Range Device) rights giving secondary use of the same 433.050 to 434.920MHz frequency range. Only flea power transmitters are permitted -typically just 10s of milliWatts.
As parties are legally allowed to transmit on this band it's probably worth spectrum scanning for interference if your PICAXE wireless system misbehaves! Frequencies other than 433 MHz (900 MHz? ) may offer workarounds too. Stan.
https://i.stuff.co.nz/waikato-times/news/300493754/mysterious-carlocking-block-at-hamilton-shopping-centre-due-to-an-electrical-incident
Here's an earlier incident => https://i.stuff.co.nz/national/106902631/dozens-locked-out-of-car-in-invercargill-cbd-because-radio-equipment-blocked-car-remotes
Radio amateurs ("Hams") have primary use of the frequency range 433.050 to 434.920MHz as part of their wider 430-440 (or 420-450) MHz "70 cm" band entitlement. Transmitter powers of 10s of Watts are permitted. Commercial services also may use this slot.
Many car door remotes operate under SRD (Short Range Device) rights giving secondary use of the same 433.050 to 434.920MHz frequency range. Only flea power transmitters are permitted -typically just 10s of milliWatts.
As parties are legally allowed to transmit on this band it's probably worth spectrum scanning for interference if your PICAXE wireless system misbehaves! Frequencies other than 433 MHz (900 MHz? ) may offer workarounds too. Stan.
Last edited: