I would leave it alone. The 38 ohm antenna is excellent.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 11/8/2013 3:18 AM, Richards wrote:
Interesting commentary, Ken.
I DO have a 40m ground plan with 65 radials. And it has that textbook 38
ohm low SWR you mention. It seems to work swell... but your comment
suggests it could be better.
A friend suggested I make it slightly taller and add some capacitance
until it presents a an inherent 50 ohm load. (I think that is what he
said... let's assume HE said it right, if this is not a good idea... and
presume I remember it wrong...)
So - What would YOU do with my antenna to make it work better?
(This is NOT an argument - it is a very serious question to me.)
-------------------- K8JHR -----------------------
------ Original Message ------
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
A quarter wavelength vertical over an excellent ground counterpoise
system has an impedance of about 37 ohms. If you don't need a matching
device to get a 1:1 SWR at the resonant point, then it is likely you
have about 13 ohms of loss resistance (the kind that produces heat,
versus radiation resistance, the kind that produces a radiated signal)
that added to the 37 ohms of radiation resistance makes a perfect match
to your 50 ohm coax. Very convenient. Not very effective. What would you
rather have? A low SWR or a stronger signal? Many hams have chosen
(perhaps unwittingly) a low SWR.
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