|
I think so Bob , you would have a
parallel tuned cct , with high Z , a open cct between
the rod and the top load ?
I use a series coil , part of the inv L
at the top of the vertical section
G,
Sent: Wednesday, June 11, 2014 8:30 PM
Subject: RE: LF: Testing WSPR2 to night a short antenna for future
mobile use on MF band.
Warren; I never gave a thought to self resonating a coil
arrangement. It could resonate but put out no power to the ant if
self resonant?
Date: Wed, 11 Jun 2014 14:48:26 -0400 From: [email protected]To: [email protected]Subject:
Re: LF: Testing WSPR2 to night a short antenna for future mobile use on MF
band. Andy,
You need such a large inductance for this, be careful how you
wind the coil since self–resonance might be near the operating frequency!
73 Warren K2ORS
On Tuesday, June 10, 2014, André Guyé < [email protected]>
wrote:
Hi to all.
I am thinking now about the design of
a short vertical antenna, for MF mobile use in next winter
season.
To night I’ll test this first
configuration : a 2 meters high tube (2 cm of diameter) and a top hat (wheel
shape) 80 cm of diameter. It needs about 2.4 mH base coil tuning. The
TX is 3 Watts output. Base voltage is 2,2 kV
RMS.
I’ll test this small antenna to
night, beginning at 2000 TU on WSPR2 MF band. The
expected ERP is about 1 mW.
All reports be welcome. Note that to
night the testing antenna has his base on the garden with a ground earth rod,
so it is not installing on my car.
73 de Andy. F6CNI -
JN19QB
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| -- 73
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WD2XSH/23
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