RSSI difference same hardware

[Junges]

Hi,
I have the following questons:

1)Should i see difference in rssi from a bunch of different rfm69hw radios with exactly same firmware and hardware? The difference is something around -20 in some cases without obstacles at same position and same spatial orientation of the device.

[LukaQ]

Hello,

depends... are they transmitting at the same time? Do you have the same antennas, same orientation? Do you have them too close to each other?
20dB is a lot, so no, you shouldn't see that much

[Junges]

Exactly same hardware, firmware, antenna and orientation and enclosure.

Is it possible two brand new rfm69hw transmit  a different power even being configured with same firmware? (Same setpower level for instance)

[LukaQ]

I don't think that is possible, no.
Do you have both transmitters on at the same time or just one at a time?