[Dx4win] FSK RTTY with DX4WIN/MMTTY and microKeyer

[Radivoj Kar, F6GNZ]

I've decided to try FSK (no AFSK) with microHAM keyer and have configured router, DX4WIN and associated MMTTY for FSK as indicated in Router documentation. RX is ok, on TX FSK COM5 port well indicates 45.5N1.5 and my FT1000MP goes to transmitt in RTTY LSB mode, I can change output power and MMTTY display shows normal RTTY display at TX, but nobody answers my calls on their frequency ! I have no test bench nor another RX at hand to check what might be happening. Has anybody an idea what's going on??? 
73, Radi F6GNZ