Hello everyone, please notice I'm a very much newbie here; Thanks for your understanding
Installed successfully OpenWrt 19.07 under Raspberry Pi (B) - first wifi OK, creates interface radio0 and connects to hotspot no problem.
Added a second card, drivers OK but interface radio1 not created and when forced into /etc/config/wireless , LuCI shows "device not active".
Drivers are indeed OK because LuCI->Scan can effectively pick up signals and allows to connect hotspots BUT when set itself as AP, connection to first wifi is inevitably lost.
Reverting roles, same story.
[As a side question, it comes totally as a surprise how radio0 manages to become wlan0 under iwconfig // and how to show actual wireless cards attached, besides lsusb. Magic?].
Thanks in advance for any hint.
Bus 001 Device 016: ID 0bda:0179 Realtek Semiconductor Corp. RTL8188ETV Wireless LAN 802.11n Network Adapter Bus 001 Device 018: ID 1a40:0101 Terminus Technology Inc. Hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 005: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter Bus 001 Device 017: ID 0e8f:0040 GreenAsia Inc. Bus 001 Device 015: ID 1a40:0101 Terminus Technology Inc. Hub 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