Visonic Powermax System Jammed problem.

[bernardgreen]

Can 2.5Ghz and 5Ghz jam receivers operating on 868Mhz or 433Mhz ?

Yes if the signal strength of the 2.5Ghz and 5Ghz is enough to swamp the front end of the 868Mhz or 433Mhz receivers.

Also modulation of a transmitter's 2.5Ghz or 5Ghz carrier with a digital signal will create sidebands above and below the carrier frequency. Normally these sideband signals are very weak but if the modulation and / or the tranmitter's RF output is not properly filtered then the sidebands can be strong enough to affect a wide range of frequencies

 

[secureiam]

Agreed hence why its unlikely but not impossible, as for measuring this that is another issue for the average home owner.
You have stated this many times @bernardgreen on this forum alone.

In @Natq case the system has been reset and the hub turned back on and no issues for now at least. @bernardgreen should the device (new router) be returned as potentially faulty or are there circumstances where it could temporarily cause an issue. (old tech support turn it off and on fix to reset). You wouldn't want it to regularly interfere and it shouldn't.

 

[bernardgreen]

You wouldn't want it to regularly interfere and it shouldn't.

With that I agree.

When Citizen's Band Wireless was released to the public there were several professional radio engineers who feared the worst.

A few Licence Exempt channels in the 27MHz were allocated for CB, Also in the 27MHz band were existing licenced channels for radio paging systems and model control systems.

Model aircraft crashed causing damaged to property as well as the aircraft and radio paging systems were jammed out. Jammed hospital systems did result in delays getting staff to critical patients and it is known that patients suffered, some may have died as a result.

First attempt to deal with the problem was to ban AM Citizens Band equipment and restricting legal CB equipment to FM which is far less likley to create sidebands.

That reduced but far from eliminated the problem.

New bands around 32MHz were allocated to radio paging and an intensive program of retuning thousands of paging receivers was carried out. Model aircraft were also given new channels.


Spring forward to today, the Licence Exempt bands are flooded with a multitude of systems from car locking systems to burglar alarms and whole house wireless connected internet access.

The equipment varies from well designed equipment that meets the requirement down to some really crud equipment which, despite the manufacturer claims does not meet the minimum of the requirement for it to be used.