For some time I have been using a Signalink USB with a SGC SG-2020 for JT-65 HF and transmitting and receiving functioned well. Several weeks ago I purchased a very nice TenTec Argonaut V and purchased the proper 5 pin DIN cable and jumper module to interface the Signalink USB with the Argonaut V. The problem I am experiencing is that I can receive JT-65 HF but cannot get JT-65 HF to key the transmitter. When I click on the CALL CQ button on JT-65 HF it shows TX ON but the Signalink USB will not go into transmit mode. JT-65 HF is then locked up in TX ON and cannot be unlocked by use of the TX OFF button. Even though JT-65 HF indicates TX ON, it continues in the receive mode. I have went through all of the trouble shooting tips for the Signalink USB and everything is as it should be. As yet I haven't been able to contact Tigertronics tech support people. Does anyone have a suggestion for a solution to this problem?