RFLINK ESP8266 with FS1000A as transmitter

[RVC69]

Hello,
Thank you for this excellent program.
Flashing an Arduino Mega Original RFLINK R48 with RXB6 receiver and FS1000A as transmitter works perfectly.

As indicated on README Wemos D1 ESP8266 with RXB6 works well.

Unfortunately adding the FS1000A as transmittor does'nt work anymore ( may be continuous transmitting ?) . Connected +5V , GND and D4->DATA for FS1000A.

Changing D4 for other pins in radio.h doesn't help.
May be a pinout or software issue ?
best regards