[ARC5] ER ARC-2 & Antenna Matching

[AKLDGUY]

An important consideration is harmonic suppression. Does a series cap
provide that? A parallel one certainly should. Why not both, with a small
fixed cap in series to a large broadcast type variable in shunt from coax
inner to braid.

Neil ZL1ANM


On Wednesday, May 9, 2018, David Stinson <arc5 at ix.netcom.com> wrote:

> Saw ER's latest issue with that cool ARC-2/ARC-5
> combination.  The author (our very own Jeep Platt)
> speaks of using 1000 pFd ( I assume between the
> ANT post and ground) to match a 50-Ohm load on 80
> Mtrs.  I use 100 pFd in series with the 50-Ohm
> load and get full output.  I'm not trying to
> criticize someone else's solution, and I know
> we've talked about this before; just want to
> understand- would think that 1000 pFd to ground
> would eat a lot of power in circulating currents,
> just like matching an electrically short vertical
> by putting a big cap at the bottom.  It will tune
> it, but since the majority of the RF currents are
> down near the ground, they contribute nearly
> nothing to the radiation resistance of the overall
> system.  A series cap doesn't divide the RF
> currents this way.  Some folks- and I assume with
> good, sound reasons- prefer the cap to ground
> method.  What am I missing here?
> Thanks,
> Dave S.
>
>
>
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