I am using a belkin usb converter on a HP desktop
That's good advice about getting a good USB/Serial
converter, there is a lot of JUNK out there.
I too am using a Belkin
USB converter, but from
desktop to CT-17 to PROII, works FB with HRD.
What's your OS? Maybe a driver issue?
I'm sure you've double checked the CI-V
address and speed settings?
QRZ Forums has a specific section for HRD issues,
you might want to post there too.
Good luck es 73, Ken AD6KA