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## Re: [TowerTalk] 7-16 Din

 To: "Tower and HF antenna construction topics." Re: [TowerTalk] 7-16 Din jimlux "Tower and HF antenna construction topics." Wed, 21 Apr 2010 08:19:42 -0700 mailto:towertalk@contesting.com>
 DF3KV wrote: > The IEC rating for N connectors is 1KV working voltage and 2.5KV proof > voltage at sea level, 40-65Hz. > > 10KW into 50 Ohms results in less then 1KV, so that is OK with pulsed > applications. > yeah.. and the Amphenol corrugated N is rated at 707 volts, which corresponds quite nicely to 9996.98 Watts And, as a practical note, they work to many kilovolts. The connector's test condition/spec probably has some "work at altitude" aspect to it, as well, so the actual design has air gaps compatible with 700-1000 volt ratings. Probably the limit is the e field between center conductor and shield. Emax = V / ( Rinner * LN( Router / Rinner)) where: Rinner is radius of the inner electrode Router is the radius of the outer electrode LN() is the log base e of the argument V is the voltage between the electrodes (from http://home.earthlink.net/~jimlux/hv/efield1.htm) Rinner = .118 Router = .316 Emax = V/.116 inch Air breakdown is roughly 70 kV/Inch 70 *.116 = 8 kV The breakdown is likely to occur along a dielectric face, and the usual rule of thumb is that the breakdown voltage is 1/3 that of free air, so it looks like, by design, the N connector is good to around 2-3 kV. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
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