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On Fri, Mar 10, 2017 at 9:19 PM Chuck McCown <[email protected]> wrote: > If you have an imaginary number, then your voltage is too low for the > system to work. > > *From:* Forrest Christian (List Account) > *Sent:* Friday, March 10, 2017 8:21 PM > *To:* af > *Subject:* Re: [AFMUG] Raw Data > So here's where my formula breaks down: > > If Vin^2 < 4*Pload*Rcable, then you end up with a negative number you need > to take a square root of.... Somehow I don't think an imaginary number is > what we're looking for. > > I wonder if for instance solving for the total current might solve this > problem, then you could use the current to determine the voltage drop. I > haven't even started to look at whether this is any simpler or ends up with > a non-contiguous function or not. > On Fri, Mar 10, 2017 at 8:46 PM, Chuck McCown <[email protected]> wrote: > > I think you would agree, this is not as simple as it first appears.... > > *From:* Forrest Christian (List Account) > *Sent:* Friday, March 10, 2017 7:43 PM > *To:* af > *Subject:* Re: [AFMUG] Raw Data > > Calculated values, from 16 to 24, using 6.24 as the power, 8 ohms, and 16 > through 24 volts in. This is using my formula: > > 11.75233261 > 13.22546294 > 14.57494395 > 15.85059052 > 17.07672241 > 18.26723889 > 19.43089556 > 20.57358804 > 21.69948452 > > (SQRT(Vin*Vin-4*Pload*Rcable)+Vin)/2 > > > On Fri, Mar 10, 2017 at 6:45 PM, <[email protected]> wrote: > > This is an SM with and without an 8 ohm series resistance. > This data was after boot up. > > I came down from 24 volts when testing with the 8 ohm because it will not > boot with the resistor until you get up to about 18 volts due to high > current during booting. > > Voltage Current Power 8 ohm I 8 Ohm Load V > 11 0.56 6.16 > 12 0.52 6.24 > 13 0.48 6.24 > 14 0.45 6.3 > 15 0.4 6 > 16 0.39 6.24 0.56 11.52 > 17 0.35 5.95 0.47 13.24 > 18 0.34 6.12 0.43 14.56 > 19 0.32 6.08 0.38 15.96 > 20 0.3 6 0.35 17.2 > 21 0.28 5.88 0.33 18.36 > 22 0.28 6.16 0.31 19.52 > 23 0.27 6.21 0.3 20.6 > 24 0.26 6.24 0.28 21.76 > > Am late for a company dinner celebrating the 10 anniversary of one of our > employees. > So will analyze tomorrow to see if it matches my quadratic equation. > > > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > > > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > >
