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5. Antenna Connection:
The transceiver will operate using any
standard
50-ohm
mobile whip, long wire or similar antenna. The
antenna should be rated at 50 watts PEP
minimum. A standard SO-239 type antenna
connector is located on the rear panel of the
Huracan HR-07-NZ. Connection is made using
a
PL-259
and
(RG213,
RG58A/U
recommended).
A
provides
greater
recommended
for
operation.
For
point-to-point
operation,
a
directional
operates at greater distances even under
adverse conditions. A non-directional antenna
should be used in a mobile installation; a
vertical whip is best suited for this purpose. The
base loaded whip antenna normally provides
effective communications. For greater range
and more reliable operation, a full quarter wave
whip may be used. Either of these antennas
uses the metal vehicle body as a ground
plane.Once the antenna is mounted on the
vehicle, route the coaxial cable so that it is not
next to any power cables or vehicle cables.
Connect the PL-259 to the antenna connector
on the rear panel of the Huracan HR-07-NZ.
Make sure that the cable does not interfere with
the safe operation of the vehicle.
6. VSWR:(Requires external s.w.r meter)
Before use, it is important to determine the
antenna system's VSWR (voltage standing
wave ratio). You will need a high quality SWR
bridge
(meter)
to
antenna system. First, make sure the SWR
bridge is in good working order and is
calibrated. To ensure your radio is performing
properly the VSWR should never exceed 1.5 to
1. Never transmit on any
where the VSWR exceeds 1.8 to 1.This will
stress the output stage and could destroy the
RF mosfets; this type of misuse and failure is
not
covered under warranty. Measure the
VSWR at the center of the operating band.
Tune the antenna (according to the antenna
manufacturer's tuning instructions) so that the
VSWR is as close to 1 to 1 at the center of the
operating band. Next, measure the VSWR at
the lowest and highest
transceiver. If the antenna has a wide enough
frequency range and band-pass, he VSWR
ground-plane,
high-grade
coaxial
or
Mini
RG-8
ground-plane
coverage
and
fixed
station-to-mobile
fixed
beam
accurately
tune
antenna system
frequency of the
treadings should be below 1.5 to 1 across the
entire operating band. If at the lower or upper
vertical,
end of the transceiver operating frequency, the
VSWR measures more than 1.5 to 1, it is
recommended that the antenna be retuned
before operating on those frequencies.If you
are experiencing unusual VSWR readings
check for the following possible problems:)
cable
1: Make sure that the antenna is installed
is
properly and grounded.
antenna
2) Check all coaxial cable and connectors for
is
defects and poor routing.
3) If testing a vehicle installation, make sure
station
that all vehicle doors are closed when
antenna
testing.
4) Do not test near or around large metal
objects or buildings.
TUNING THE ANTENNA FOR OPTIMUM SWR
Since there is a such a wide vanity of base and
mobile antennas, this section will strictly
concern itself to the various types of mobile
adjustable antennas. Because the antenna
length is directly related to the channel
frequency, it must be tuned to resonate
optimally all Frequencies of the transceiver.
28.000mhz requires a longer antenna than
29.700mhz, because it is lower in frequency.
Due to the various methods of adjusting
antennas for proper SWR we have chosen what
we think is the optimum method:
WARNING
CONTINUOUS OPERATION OF THIS
TRANSMITTER WITH GREATER THAN 4:1
VSWR ANTENNA MISMATCH MAY RESULT
your
IN RF AMPLIFIER DAMAGE.
A. Antenna with adjustment screws (set screws)
1. Start with the antenna extended and tighten
the set screw tightly enough so that the
antenna can be lightly tapped with your finger
for easy adjustment.
2. Set your transceiver to a mid band frequency.
Press PTT (push-to-talk) switch, and tap the
antenna shorter. The SWR meter will show a
lower reading each time the antenna is tapped.
By continuing to shorten the antenna you will
notice the SWR reading will reach a lowest
point and than start to rising again, this means
the optimum tuning being pressed for center
operating frequency of your transceiver.
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