Any antenna can work. . . it's a question of degree.
-----Original Message-----
From: Steve Lawrence
Sent: Saturday, September 15, 2018 9:36 PM
To: John Harden, D.M.D.
Cc: [email protected] ; [email protected] ; cfytech24x7
Subject: Re: Topband: Use shunt fed tower
217 DXCC 36 Zones. Shunt fed tower. No radials. West Coast city lot. I can
only imagine my totals if it really worked.
73 Steve WB6RSE
On Sep 15, 2018, at 5:42 PM, John Harden, D.M.D. <[email protected]>
wrote:
A shunt fed tower requires radials period. It cannot work without them!
73,
John, W4NU
Sent from my iPhone
On Sep 15, 2018, at 1:55 PM, <[email protected]>
<[email protected]> wrote:
It makes no difference how the tower is fed, a vertical antenna must have
radials of some kind to be effective. 73. . .Dave, W0FLS
-----Original Message----- From: cfytech24x7
Sent: Saturday, September 15, 2018 11:29 AM
To: [email protected]
Subject: Topband: Use shunt fed tower
A shunt fed tower is a vertical antenna so it offers lowest take off
angle. Shunt feeding avoids need for radial field. Any horizontal wire
antenna is going to put most of your radiated energy out at high angles,
unless you can get it at least a half wavelength of height. A loop may
be a quieter antenna for RX but your existing inverted Vs are no doubt
better for TX.
There is some art and experimentation involved in the matching but the
results will be worth the effort. I would start with your highest
antenna for top band, next highes for 80m. Note that your yagis will act
nicely as capacitive hats to add to effective tower hight.
Gl es 73, ab1vl chuck
Sent from my Galaxy Tab® A
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