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These Samlex supplies are designed for battery back-up systems and float the batteries around 13.4 volts. The equipment is directly bussed to the batteries leaving no relay failure point or inline diode voltage drop in this type of system.

15amp for the servers and 30amp for vhf repeater




BatterysBoth deep cycle SLA batteries are located in the crawl space. 105ah for repeater 75ah for servers.  Below are automotive fuse blocks I use to simplify and clean up low voltage wiring.






This is the finished Server that replaced a very power hungry HP DL380G5 sever. It’s a dual bios micro ATX board powered by a DC to DC 160 watt 12 volt power supply to insure long battery operation, 60 watt 3 Ghz intel duo processor, 32Gb solid state OS drive, AC power supply installed in case of DC-DC supply failure. There are many services running on this server, Virtual Weather Station, UI-View32 with add-ons as an APRS Igate and Digi, Icecast for hosting audio, kc7rjk/Rlocal scanner audio, and four instances of edcast to stream those and NOAA Eugene, and NOAA Florence to the weather radio network.




The small DC to DC supply can just be seen plugged into the mother boards power header.

PCirlp PCallstar


IRLP node 3543 Raspberry Pi system              AllStar node 29650 radio interface installed inside

The 12v PC’s draw very low power from a dedicated a battery backup system that powers the PC’s and networking equipment in a mains failure. All Three PC’s draw 6 amps at 12v under normal operation giving about 12 hours of battery time. The AllStar machine is based on a mini itx motherboard and a SATA SSD. Being fanless and with zero moving parts I’m hoping for years of maintenance free service, unless murphy stops by. The other is a Raspberry Pi computer or PiIRLP, it’s a great hardware choice for IRLP. This system also has zero moving parts and can be put together as seen here less the case for $70! The only thing is i wonder the life of the SD card… It’s powered through a 7805 regulator and salvaged micro usb cable drawing only a couple watts. I also used a 150K pad on the audio input, was a good value between the CM108 fob and Arcom controller leaving both adjustments close to union.

PCirlp2 LowVoltPCs

About me

I was born in June of 1981 in the town I presently reside in, Eugene Oregon. Graduated North Eugene High School in 1999, Lane Community Colleges Fabrication Welding 2 year program, and there Engineering Program in electronics. I work 2 jobs both part time with weird hours. I’m a self-employed fixer fabricator welder. I ran a business as a mobile welder but it seemed most of my business was out of my small shop. For my day job, I work for a local company that sells and distributes machine vision equipment. (Motion Analysis inc.) I work as a service technician diagnosing, modifying, and repairing ill equipment for the industry. I also build custom cables and equipment such as break out boxes, multi camera sync generators and other low production custom items for the industry. Other hobbies of mine include wake boarding, snow boarding, hiking, fishing, Chevy’s, hot rodding, 4 wheelin…. Pretty much anything outdoors, or with an engine, but it gets hard to do these days there’s never enough time for myself and the two labs… 73