User Manual E3
59300623 Rev.001
5.4.2018 9(20)
Forward path
The input and output amplifier stages are both based on high performance
solutions which allow the user to set E3 outputs for high and low output levels.
The output stage uses a GaN hybrid to improve RF performance over the entire
85 to 1218 MHz passband. Note that E3 must have a proper matching at output
port(s) to ensure optimal and reliable operation.
Forward path gain control
E3 has two gain control elements in its forward path signal route: input gain and
interstage gain. The software automatically adjusts these elements based on
the desired total gain. The total gain is adjustable between -26 and 0 dB in 0.5
dB steps.
When the built-in cable simulator is enabled (input slope < 0 dB) by the user,
the available forward path gain decreases by 13 dB. The software automatically
compensates for this as far as possible by changing the total gain value by + 13
dB. The opposite happens when cable simulator is disabled.
Forward path slope control
Forward path slope is the frequency response level difference between 85 and
1218 MHz. It is controlled by two elements:
1) Input slope, coupled with built-in cable simulator: Adjustable between -13
and 20 dB in 0.5 dB steps. Negative values enable the built-in 13 dB cable
simulator and reduce the maximum gain by 13 dB. Forward path gain is
automatically adjusted to 13 dB higher value, if possible, to compensate for
the gain loss caused by the cable simulator.
2) Interstage slope: Adjustable between 0 and 15 dB in 1 dB steps. Note that
1
st
generation E3 amplifiers have only two choices: sloped (13 dB) and flat
(0 dB).
Interstage slope should be set according to desired output slope. After selecting
the correct interstage slope the low frequency output signal levels should be
adjusted with a measurement instrument using input slope control.
Increasing slope value decreases low frequency signal levels.
Power save
The RF performance and power consumption of E3 can be adjusted by
controlling the output hybrid’s current. Power save is disabled as factory default.
This ensures full performance and should be used if output levels are close to
maximum.
If output levels are more than 2 dB below the specified maximum levels the
power save can usually be enabled to achieve a ~3 W reduction in power
consumption without any effect on RF performance.
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