Hi John....here DC9UP, Hermann. I do have a Rb from Ball-EFRATOM and its used to steer my whole 10 GHz equipment including DSP-10 and 10224 MHz LO. It is monitored by the Brooks PCB. If you like to have more information pse contact me off-line at _DC9UPgermany at aol.com_ (mailto:DC9UPgermany at aol.com) best 73 de Hermann