599 / Eagle Users manual Release 1.009 CE – April 15, 2015
Part #74447
Printed in USA 37
9.3. Proper Tuner Operation
The Internal Auto Tuner provided by the Eagle is designed to recall the last tuned setting for a
given band. This enables the operator to change bands without the requirement of “re tuning” every
time the band is changed. While this gives users the ability to quickly change bands and transmit,
such as in certain contests, this does require the operator re-tune each band whenever an antenna is
changed. This will help prevent transmitting a high power level into a mis-matched antenna tuner.
Therefore, it is recommended that the operator train himself to re-tune every band he will use for a
given antenna connection, whenever….
1) The first time he ever connects his Eagle up to his antenna in his shack, after delivery from the
factory. (The factory shipped units should be set up with the tuner connected to a 50-ohm
dummy load, however, it is still strongly advised that an operator re-tune each band on his own
equipment/antenna/dummy load before transmitting 100 watts)
2) When the antenna is changed.
3) When changing from the low end of a band to the high end of a band, especially on 80m and
160m. Or vice versa.
4) SWR appears high on the radio.
5) The desired power level is not attained.
6) The radio shuts off or quits transmitting, due to:
a) High Current Protection
b) Temperature Protection
9.4. High Current Protection
The Eagle constantly monitors the Current on the PA. When this current exceeds a safety level, the
Eagle will shut itself down. Requiring a power reset.
Typically, this will occur when transmitting higher power levels into a mis-matched antenna. If the
Internal Auto Tuner is installed in the Eagle and is being utilized, then re-tuning this band may
solve this situation. If the Internal Auto Tuner is not installed in the Eagle or if an external Tuner is
required, then re-tuning the external Tuner may solve this situation.
9.5. Temperature Protection
The Eagle constantly monitors the Temperature on the PA. When this temperature exceeds an
initially higher than room temperature, the internal fans will be turned on, gradually as temperature
increases, to try to alleviate the situation. When the temperature exceeds a safety level, the
transmitter will be disabled. It will only be re-enabled when the monitored temperature falls back
down below the higher than room temperature.
Typically, the fans will run when utilizing high power in digital modes for long periods of time, or
constant key down that is close to the specified duty cycle for the operating modes.
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