Towertalk
[Top] [All Lists]

## Re: [TowerTalk] Prop Pitch Motor

 To: "Tower and HF antenna construction topics." Re: [TowerTalk] Prop Pitch Motor jimlux "Tower and HF antenna construction topics." Sun, 14 Mar 2010 22:13:17 -0700 mailto:towertalk@contesting.com>
 ```Gene Fuller wrote: > What is the maximum DC voltage used successfully/recommended for one of the > "small" PPM's ? What speed was accomplished and how was the brush life at > that voltage ? > I 'm building a power supply to put at the base of the tower and can change > the voltage from about 30 to 48 volts in 6 volt steps. Cable to PPM will be > 100 feet of 3-#12's. I'm figuring about 0.5 ohms and about a ten amp demand > i.e. a 5 volt drop. > Any suggestions will be greatly appreciated. > Thanks, > Gene / W2LU Handy to remember.. AWG 10 wire is about 0.1" in diameter and 1 ohm/1000 ft. For every 3 gauges, the resistance doubles. For every 10 gauges, the resistance is x10. So.. 200 ft of AWG 10 (up and back) would be 0.2 ohms. Going to AWG 12 is a bit less than doubling (0.4 ohms) Your estimate of 0.5 ohms for AWG 12 is a bit pessimistic. (assuming a single conductor up and back) If you were thinking triple AWG 12 up and triple AWG 12 back, you'd be much less than 0.2 ohms total, since 3 AWG12s is almost twice the cross sectional area of a single AWG10. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] Prop Pitch Motor, Gene Fuller Re: [TowerTalk] Prop Pitch Motor, Jim Hargrave Re: [TowerTalk] Prop Pitch Motor, jimlux <= Re: [TowerTalk] Prop Pitch Motor, Gene Fuller Re: [TowerTalk] Prop Pitch Motor, TexasRF Re: [TowerTalk] Prop Pitch Motor, Commtekman Re: [TowerTalk] Prop Pitch Motor, Commtekman Re: [TowerTalk] Prop Pitch Motor, TexasRF Re: [TowerTalk] Prop Pitch Motor, Dubovsky, George Re: [TowerTalk] Prop Pitch Motor, GALE STEWARD