Navanidhi Electronics Pvt Ltd. Offers Solid State Relay Module. Navanidhi Electronics Pvt Ltd. Is an ISO 9001-2008 certified company. Solid State Relay Module having model number NHG-PA-20100-200 allows RF signals in both directions to enable operation in transmit and receive conditions. This unit switches the common path to VHF path of UHF path depending upon the V/U Command fed to it [VHF = OPEN and UHF = 28Volts]. In each path a High pass Filter is used to suppress transmit noise from being radiated and reject out of band noise during receive.