[Elecraft] K3 won't TX in FT-8

[Larry Libsch]

Group,

         I am unable to get my K3 to TX any RF when set up for FT-8. 
Hardware is K3, Behringer U-phoria UMC202HD USB sound card running on 
WIN XP with most recent version of WSJT-X software. FT-8 settings Radio 
Tab: baud 38,400, data 8, stop 1, handshake none, PTT CAT, Mode 
data/packet, split none. Tests of CAT and PTT are both successful. 
Soundcard tab is set for the Behringer card.

         Soundcard is cabled to LIne In, Line Out on K3. I am in Data A 
(USB) mode. K3 Menu Mic Sel is set to line in/line out. Waterfall 
displays signals and they decode properly.

         When I click the tune button in the FT-8 software, the K3 goes 
into transmit but there is no RF out. When I press the tune button on 
the K3 I do get RF out. When we briefly attached a headphones plug to 
the soundcard out lead that had been connected to the K3 line in we 
could hear the tuning tone when clicking on the tune button in FT-8. I 
do AFSK RTTY without difficulty so I do not think the line in jack is 
faulty.

         Ideas, please.

                                             K4KGG, Larry