30
F
Fiig
gu
ur
re
e 5
5..1
14
4 C
Co
on
nttiin
nu
ue
ed
d
When installed in high performance turboprop or jet aircraft, the Smartuner
will operate well with a shunt fed antenna. This is generally a 13 foot piece of
metal which mounts on the fuselage of the aircraft and is grounded to the air-
craft at one end. The device looks something like a towel bar on the underside
of the aircraft. The Smartuner will also match well the more common wire
antenna from fuselage to vertical stabilizer (and continuing to a wingtip if
desired) and a long wire antenna under the tail rotor of helicopters. This long
wire approach has proven very effective on Bell JetRangers and LongRangers
in particular.
5
5..3
3
L
LO
OW
W P
PR
RO
OF
FIIL
LE
E,, H
HIID
DD
DE
EN
N A
AN
ND
D C
CO
OV
VE
ER
RT
T A
AN
NT
TE
EN
NN
NA
AS
S
There are two general types of low profile, hidden and covert antennas.
¥ The first group is the paramilitary user who will wish to operate from a res-
idence or commercial building without drawing attention to the fact that long
range HF communication is in process.
¥ The second class of covert antenna user (and a larger group) is the amateur
radio community which finds itself more restricted almost daily by covenants,
building codes and tenant requirements.
We will consider a typical residential home and point out covert antennas
which have been used very successfully for intercontinental communica-
tions.
As you review the diagram on the following page, remember that the anten-
nas used include both groundless loop type antennas and those which require
a counterpoise (ground).
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA
P.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: [email protected] Web site: http://www.sgcworld.com
© 1998 SGC Inc
SG-230 Manual
Wire antenna
Rotary Aircraft
Strut to space out
antenna with plastic
tubing or fiberglass
rod
Coupler
Isolator