I recently purchased a used Kenwood TS-820. It's great for voice (haven't tried CW) but I'd like to experiment with digital modes. Ideally what I'd like is to be able to adjust the frequency (within a given band - I know that I need to re-tune the rig for different bands) using my computer, so I can automatically scan up and down the entire band for digital signals. The TS-820 has a connection for an external VFO. If I were to attach a VFO that output the same IF as the Kenwood external VFO using that connector, that would do it, right? I can find the pinout for the VFO plug, but I don't know the IF or the output levels the rig is expecting. I also don't know how to build an external VFO, but hopefully I can figure that out.