UHF Repeater ver1

My repeater with controller by LA4PMA. It just await to be installed in the metal box at the site.

I bought the duplexer and 24V/350W PSU(on the right side) from ebay. They work quite well for now. The small box, mounted on the PSU(named UPS) is a DC-DC convertor and voltage/current comparator made by "PARADOX" for security systems. It charge the backup battery. The fan is controlled by TEMP signal (LM393, one transistor and filter, simple but very accurate scheme, thanks to internal temperature sensor). The black box on the heat sink at left is isolator (two circulators "MACOM" terminated with dummy loads on the heat sink). It is not necessary, but i put it to prevent damage of the final amplifier if someone cut my cable to the antenna. In the next controller will be implemented HI_VSWR Protection. When AC voltage is present the repeater work with 36W output power (24V 4.3A / 0.5A at standby). If there is no AC voltage the rpeater work on 12V and the output power is reduced to 18W (13V 3.3A / 0.5A at standby). Switching of DC supply voltage is done by relay.