WB6DAO, K6MF, K9EQ and K6DVD operate nodes that are connected together most of the time (activity on one repeater will be heard by the remaining ones). They are connected to the K6MF, K6DVD, K9EQ and WB6DAO UHF repeaters.
All All of the above are EchoLink nodes (except for K9EQ it is IRLP). The EchoLink nodes are running Raspberry PI ($35) computers and consume very low power, but are very versitile, thanks in part to the "TLB" software.
NOTE: Because of abuse by a few stations connecting and disconnecting, bad language, foreign language, and other problems, the access to these nodes has been restricted: "Private Conference"