Use isolation transformers. And call it a speaker wire. You are sending a loud 60 cycle tone.
From: Eric Kuhnke Sent: Wednesday, July 06, 2016 11:10 AM To: [email protected] Subject: Re: [AFMUG] Practical/low-cost 18AWG copper outdoor Yeah, can't do either of those... Burying it to Canadian electrical code compliant depth through 700 meters (2296 ft) of forest, fallen trees and rocks isn't going to happen. There is the slight possibility of electrical inspection based on where the power would be coming from. Using a 110/240VAC input active PFC 200W power supply that can output 54.5VDC and a DC-DC converter on the load end to bring things back to normal 46-48VDC will work. AC to DC meanwell RSP-200-48, $41 DC-DC meanwell SD-200C-48 $71 On Wed, Jul 6, 2016 at 9:44 AM, Bill Prince <[email protected]> wrote: Or you could buck it to 480VAC or more... bp <part15sbs{at}gmail{dot}com> On 7/6/2016 9:34 AM, Chuck McCown wrote: 240 AC over direct burial romex. All the power you might want. From: Eric Kuhnke Sent: Wednesday, July 06, 2016 10:29 AM To: [email protected] Subject: Re: [AFMUG] Practical/low-cost 18AWG copper outdoor It's looking like $0.25/ft for the cable and the singlemode fiber is less... Also the area is totally filled with trees, trees cannot be cut for various reasons, it's the side of a bluff on a hilltop. Branches and a few things in one particular direction (about 10 degrees of azimuth) would be cut to put in the PTP link. North of 49 latitude. With DC power over 14AWG it could be enough power for up to 75W of radios on the far end. Off grid solar to do this would be $4000 of panels batteries enclosure, charge controller. Very challenging site for solar, if you were to camp there you might see 2-3 hours of direct sunlight per day max due to tree shading. On Wed, Jul 6, 2016 at 8:57 AM, Bill Prince <[email protected]> wrote: For that amount of cable, at 50 cents a foot, I would probably do a small solar setup. What is the latitude? bp <part15sbs{at}gmail{dot}com> On 7/5/2016 4:25 PM, Eric Kuhnke wrote: Due to terrain I'm helping somebody design a network link where a PTP radio will go on the side of a tree on the opposite side of a mountain from where AC power, a router and other network equipment is located. We're looking at 600 to 700 meters of singlemode fiber and a small NEMA4X junction box with the radio on the far side of the hill, containing a SC-SC patch cable bulkhead and a meanwell DC-DC converter. It looks like based on the wattage of the radio and voltage drop calculations for 18-2 cable that we can get away with a 56VDC power supply at the power source, dropping to not lower than 35VDC at the receiving end, which will be fed into a DC-DC converter to bring the output back up to 52.5VDC for the radio. If you had to run 600-700m of 18AWG cable outdoors through a forest, how would you do it? SJOOW type cable may not hold up over a long enough time. Ideally something that is more armored than SJOOW (it can be much less flexible if needed). Cost is somewhat of a factor.
