599 / Eagle Users manual
Release 1.002 – September 27, 2010
3
Part #74447
Printed in USA
1.4.
Connection to Antenna &
Power Supply
The Eagle is designed for use with any
antenna system providing a 50 Ohm resistive
impedance at the desired operating frequency.
Every effort should be made to ensure the
impedance of the antenna system is as close
as possible to the specified 50-Ohm value.
Note that the “G5RV” type antenna and some
Windom’s do not provide 50-Ohm impedance
on all HF Amateur bands, and an external
wide-range antenna coupler or the optional
model AT599K Eagle internal auto tuner may
be needed with this type antenna. Any
antenna to be used with the Eagle must,
ultimately, be fed with 50 Ohm coaxial cable.
The Eagle transceiver requires a source of
well-filtered and regulated DC voltage. The
supply voltage on the Eagle is 13.8 Vdc
nominal +/- 15% to allow for mobile and
battery operation. The voltage source must
be capable of supplying a minimum of 23
amperes continuous duty at full 100 watt
output for AM & FM modes. The model 940
or 941 Ten-Tec power supplies will meet or
exceed
your
voltage
and
current
requirements. We recommend using the
included DC power cable (P/N 46214). Use
of #12 stranded wire is recommended for
mobile and in home use to accommodate the
required current demand during transmit.
Note: Always enable the power source first
and then the transceiver. If a generator or
battery connected to a charger is used to
supply the DC source, always turn off the
transceiver before starting or shutting off the
DC source equipment. These recharging
devices often generate large voltage spikes
that can damage the transceiver.
1.5.
A word about grounding
A good ground system is essential for
optimum operation of any HF transmitter.
The best solution is to connect all the station
equipment to a single ground connection. Do
not make ground connections by connecting
one device to another, then that device to
another, etc. and then finally to the ground
bus. This so called “Daisy-Chain” grounding
technique may nullify any attempt at effective
radio frequency grounding. See Figure 1.5-1
Grounding
Figure 1.5-1 Grounding
Remember that a connection to a copper cold
water pipe is no longer suitable and is in
violation of the National Electrical Code.
Many modern water connections use plastic
pipe, and are not suitable ground connections.
A good ground system can contribute to the
station efficiency in a number of ways
including minimizing the possibility of
electrical shock, and minimizing RF currents
flowing on the shied of the coax cable
causing interference to electronic equipment
and transceiver accessories.
