Tx Offset usage
The current Tx Offset control will allow you to enter values beyond the allowable limits of the MMVARI encoder/decoder. The Tx Offset control will change to a combo box pick list for the next version. In the meantime do not enter values larger than +/- 20 Hz. This control is used to compensate for small differences between Rx and Tx frequencies. The difference is the combined error of your sound card codec and your transceiver. Start with a 0 Hz offset. If you find that your Tx signal is 10 Hz higher than your Rx point then enter 10 Hz into the control and vbdigi will subtract 10 Hz from the transmitted audio waveform.
If you want to a large frequency differential between Rx and Tx then you should use the Split control for that purpose.
Remember that there is on-line help for vbdigi: http://w1hkj.com/vbdigi-help/vbdigi.html
73, Dave, W1HKJ