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KB2VXA > HF 04.09.03 00:36l 38 Lines 1536 Bytes #999 (0) @ WW
BID : 12595_WT3V
Read: DB0FHN GUEST
Subj: Re: PA2RHB > G5RV antenna
Path: DB0FHN<DB0RGB<DB0MRW<DB0PV<DB0FSG<DB0GAP<DB0GPP<DB0LX<DB0CZ<HB9EAS<
HB9AJ<HB9AK<K1UOL<K1UOL<WB2QJA<KC2COJ<WT3V
Sent: 030903/2103Z @:WT3V.#CNJ.NJ.USA.NOAM #:12595 [Lakehurst] $:12595_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
To : HF@WW
Hi Rudolph and readers,
Not much of an argument from one who knows transmission lines. (;->)
Yes, the characteristic impedance of paralllel feeder depends on three
things, conductor diameter, spacing and dielectric material. Still it's
fairly unimportant in Amateur multiband antenna design since return loss
is the most important thing. Since such loss is insignificant in such
line even with high SWR it is the preferred transmission line.
Now if you really want to push me into deep water (over my head) we can
include commercial HF and SWBC applications. For what it's worth, since
New Jersey is home to two large coastal HF stations still standing but
not operating I have seen their transmission lines looking like anything
from ordinary 6" ladder line to something resembling high voltage
transmission lines on big wooden poles. I have seen parallel lines used
at megawatt HF broadcasting stations like VOA that looks like copper
water pipe on tall ceramic posts looking again like some sort of high
voltage system. Well, when you think of it, there is considerable high RF
potentials along those lines so the switch yard looks like a power sub
station. (;->)
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
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Message timed by cesium laser: 21:11 on 2003-Sep-03 GMT
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