SMALL UPS...

Author	Message
phil99 Guru Joined: 11/02/2018 Location: Australia Posts: 3278	Posted: 08:32am 29 May 2024         Quote   Is there no way to bypass the power supply and feed them with DC directly? It would be a lot easier. That is the way I would do it. Assuming this is a "Daisy Chain" system with a booster-splitter at each unit. Power in any unit goes off and the rest of the chain is off. In the ones I have worked on the 240V supply produces 12 to 15VDC for the amp. A small 12V SLA battery and 12V plug-pack SLA float charger at each unit would work. The other option is to couple 24VAC** into the coax with an RF choke at the head end. In each booster-splitter tap off the 24V with a RF choke. Halfwave rectify, filter and regulate that down to the required voltage. The RF choke also passes the 24VAC from the input to the downstream output. The amp circuits usually have small capacitors on the input and output. If not add 100pF to the input and output to keep the 50Hz out of the amp. At the head end the masthead amp and 24V transformer could be fed from a regular UPS. ** AC is normally used to prevent corrosion of the coax in humid weather. Edited 2024-05-30 07:33 by phil99