Yep, then its max of 36v. (These boards can be ordered custom with different power specs/components.)
That should work fine. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Kurt Fankhauser" <[EMAIL PROTECTED]> To: "'WISPA General List'" <[email protected]> Sent: Thursday, September 11, 2008 9:31 PM Subject: Re: [WISPA] 24v Metro max input voltage? > It says 18-36v on the board. The only power supply I got right now that is > 24v is a Canopy one. I think I'm gonna put the Canopy PS on it for now > (reversed polarity) and order a 24V Pac Wireless PS and swap that out when > I > get it. I'm running all low power cards so the Canopy PS should be fine > until I get the Pac one. > > Kurt Fankhauser > WAVELINC > P.O. Box 126 > Bucyrus, OH 44820 > 419-562-6405 > www.wavelinc.com > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Tom DeReggi > Sent: Thursday, September 11, 2008 9:28 PM > To: WISPA General List > Subject: Re: [WISPA] 24v Metro max input voltage? > > The thing to remember is that over a distance, voltage drops more at > higher > amperage operation than it does at low amperage operation. Wifi radio > cards > are constantly outputting at a wide range of amperage as it jumps back and > forth between transmitting and not-transmitting. So to optimally protect > your gear from over powering, you need to calculate the voltage drop it > can > have at the lowest current draw, which will have less voltage loss over > the > distance. > > A good Voltage calculater is at: > > http://www.demarctech.com/techsupport/poecalculate.htm > > The most important thing to do is to make sure you use a "Regulated" power > supply. A NON-regulated Supply could easilly have a 1-10 volts increase > of > voltage above spec when not under load. > > Its important to know that all Metro boards do not have the same MAX > voltage > > rating. You might not be able to know for sure that your Metro can support > up to 48V without first looking at imprint on the SBC listing such. The > other issue is considering the impact that a electrical AC power surge > will > have on the DC power that goes to the SBC. If you have a cheap PS it may > allow higher voltage up the wire. A good quality hi watt regulated PS > will > absorb the surge into its capacitors, to protect the SBC. > > It may work, but I'd argue you'd be taking an unnecessary risk. > > >I have ran the board on the same 48v power supply on the bench and it >> ran fine > > If the Metro board is on your bench, is it labeled a max voltage? > > The 48V model Metros handled significantly more (I thought 56V) > > But not sure on the 24V model metros. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Kurt Fankhauser" <[EMAIL PROTECTED]> > To: "'WISPA General List'" <[email protected]> > Sent: Thursday, September 11, 2008 4:27 PM > Subject: [WISPA] 24v Metro max input voltage? > > >>I was working on a water tower today and I have a new 24v model WAR-METRO >>at >> the top. I have not powered it yet but it will be on about 225 foot of 24 >> gauge CAT5. My question is does anyone know what the max input voltage is >> on >> these things? Wlanparts.com lists it as 24v-48v input and I was trying to >> search the STAR-OS forums and Lonnie I think mentioned 48v is the >> absolute >> max and that 48.1v will start damaging the board. I have a 48v power >> supply >> bought from RFLINX in hand that I would like to use. If my calculations >> are >> right by the time the voltage gets up the Ethernet at this footage it >> will >> be outputting around 46-47 volts so it should not damage the board at >> that >> range. I have ran the board on the same 48v power supply on the bench and >> it >> ran fine for the few minutes it was plugged in. >> >> >> >> Looking for comments from anyone that may have ran a 24v METRO board on >> 48v >> POE or similar. >> >> >> >> Kurt Fankhauser >> WAVELINC >> P.O. 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