USB driver triggers SSB PTT.There is a group created for support on Yahoo Groups. I recommend that you access the group to join in. After this procedure, post the question. The developer will provide troubleshooting information for this issue with your device. Since it requires extensive radio knowledge, I believe this is the best way to overcome this issue. Groups: https://groups.yahoo.com/neo/groups/powersdr-iq/info Official website: https://code.google.com/p/powersdr-iq/
A FlexRadio PowerSDR based version with functionality suited to various SDR designs, projects and kits.
For the homebrewers simple LPT port pins are used to tune the Si570 chip as smooth VFO, drive LPF/BPF bandswitching, give PTT input and Rx Tx output control and CW keying.
USBtoSDR interface is directly supported with the included ADC/DAC and I2C connectivity.