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## Re: [Antennaware] 160 meter 3/8 wire, steel or copper

 To: Re: [Antennaware] 160 meter 3/8 wire, steel or copper "OZ1AXG Flam" Thu, 25 Sep 2008 02:28:46 +0200 mailto:antennaware@contesting.com>
 ```Hi Terry It would be better to have the antenna at resonans around 1830 (CW portion of the band), rather than 1860 where it is now , but this is where it endend up with the fixed capacitors. So if i change the wire to Copper, it would move even further up in frequence (+13KHz)... i.e the wrong way! As I understand your calculation, cap value is with a fixed wirelength... however what would the calculation in EZNEC yield if I where to change the antenna wire to 1.5mm Cu wire AND add 75 cm to the length of the antenna wire making it 47,25 meters? -- OZ1AXG Flam ----- Original Message ----- From: "Terry Conboy" > I modeled this with EZNEC (without the tower) and assumed the 1.5 mm > diameter stainless steel wire has a resistivity of 7.2 e-7 ohm-m and > relative permeability of 1.02. I estimated about 20 ohms of ground > loss resistance. Here's what happens at 1860 kHz: > Cu G=-0.43 dBi Z=52.6 -j 46.6 SWRmin=1.13 at 1922 kHz BW=97 > kHz (50 ohm SWR 2:1) > SS G=-1.48 dBi Z=68 -j 36.2 SWRmin=1.44 at 1907 kHz BW=90 kHz > > The adjacent tower will modify these values depending on where it is > resonant, cross section, etc. > > With copper, you should get about 1 dB more signal, a better match to > 50 ohms, and resonance moved up about 15 kHz. Adding another 27 pF > in parallel (457 pF total) should restore the resonant point. _______________________________________________ Antennaware mailing list Antennaware@contesting.com http://lists.contesting.com/mailman/listinfo/antennaware ```
 Current Thread [Antennaware] 160 meter 3/8 wire, steel or copper, OZ1AXG Flam Re: [Antennaware] 160 meter 3/8 wire, steel or copper, Terry Conboy Message not available Re: [Antennaware] 160 meter 3/8 wire, steel or copper, Terry Conboy Re: [Antennaware] 160 meter 3/8 wire, steel or copper, OZ1AXG Flam Re: [Antennaware] 160 meter 3/8 wire, steel or copper, K9AY Re: [Antennaware] 160 meter 3/8 wire, steel or copper, Joe, aa4nn Message not available Re: [Antennaware] 160 meter 3/8 wire, steel or copper, Terry Conboy Re: [Antennaware] 160 meter 3/8 wire, steel or copper, OZ1AXG Flam <= Re: [Antennaware] 160 meter 3/8 wire, steel or copper, Joe, aa4nn