Understanding RF bridge

trying to understand rf bridge capability
do i need every bedroom one rf bridge?
how far the bridge signal can be detected in one home.? lower floor and upper floor need one beidge eqch?

Not necessarily. Depends on local conditions, including radio traffic and such factors.
Is there any particular reason why you choose RF? Why not WiFi or Zigbee? Leaving aside specific applications, RF technology is obsolete and problematic to use. What do you need it for anyway?

i wrongly purchase dw2 rf😅. now i am trying to find better or cheaper solution or i i get new dw2 wifi. throw away that dw2rf

i term of flexibility which one better zb bridge or rf bridge? can dw2rf connect to zb bridge?
do I need ZB bridge in every room too?

Don’t do it and don’t go in that direction. Battery-operated WiFi devices are problematic. Most importantly, due to the nature of WiFi operation, cell life is annoyingly short. Check out Zigbee sensors. The latest SNZB-04P sensor is a worthy recommendation.

Zigbee bridge, of course.

It can’t. Two different protocols. They do not “talk” with each other.

In Zigbee networks, only one coordinator (controller) is allowed. Each controller forms a separate Zigbee network. Leaving aside specific needs, multiple networks in the same location is a misconception that causes problems. Each Zigbee network is a mesh type. It is self-healing and self-configurable on its own. The use of routers connected to the same controller and placed wisely in a house or flat increases the range and efficiency of the network. A router is any Zigbee device that is constantly powered (not by batteries). A router is, for example, a light bulb or a switch.

Here is an example map of the Zigbee network. Observe the lines that represent connections among them. The rectangular object is the controller. The oval ones are the routers. The round ones are battery-powered end devices (e.g. door or motion sensors).

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This is a lottery, there is no way to predict it. I know from my own experience that it is not worth getting into this technology, even if we have already spent some money on these devices. I advise you to buy a Zigbee bridge and devices compatible with it, or simply wifi switches powered by the power grid. First of all, RF communication is one-way. The end device sends the message several or a dozen times, but if it is not received by the bridge, it does not repeat the transmission. In the currently very cluttered ether, such data is often lost, the bridge does not receive it, so these devices are very unreliable.