[TowerTalk] Folded Monopole

[Larry Babb]

The article in the compedium is short, but my understanding of antenna
	theory would make me believe that the increase in the feedpoint impedance
	would make the matching network less critical for losses.  The antenna
	also is noted to appear inductive, so that matching can be done with
	a parallel capacitor across the load to tune out the reactance, and fed
	through another series capacitor for matching.
	What I find interesting is the shorting cable to also help conjugate matching
	of the feedpoint impedance.
	I ordered 500 feet of ground wire last week, so I am intending to put the best
	ground under the tower that I can, and alternate ground rods at the end of
	every other ground wire.  I don't have space for full length radials on 160
	meters, so, everything is compromise at best.  Regardless, this is an experiment
	for me to get a signal on the topband.
	So, the question, now, the three vertical wires spaced approximately 30 inches around
	the tower will be 45 feet in length.  The tower is a 50 foot tower.  This is still a
	short vertical for 160 meters, is the antenna in fact going to appear inductive?  Am
	I still going to need a low resistance hi Q coil between the feedpoint and the ground
	system to resonate it?  Thanks

Tom Osborne wrote:
> 
> w8ji.tom wrote:
> 
> > I don't have the compendiums, but I do know that Bill Orr and a few >others (including one manufacturer) incorrectly claim the folded >elements raise radiati
> 
> Hi Tom.
> Making the vertical into a folded monopole makes it easier to match than
> a single vertical.  I've put up a couple of them for 80 and they are a
> great match to 50 ohm coax.  Are they less effective than a regular
> vertical or about the same.  Thanks and 73
> Tom W7WHY

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