
FEATURES
1-50 MHz
Unity gain
Low VSWR
High isolation: 140 dB
High output: +18 dBm
Low phase noise: -155 dBc/Hz @ 1 Hz
-171 dBc/Hz @ 10 kHz
Low distortion: -48 dBc
Low temperature coefficient: 1.2 ps/ºC
APPLICATIONS
Atomic frequency standards
Atomic time scales
High performance testing facilities
Laboratory frequency distribution
Reference frequency distribution
DESCRIPTION
The HPDA-15RMi is an improved version of the High Performance Distribution and Isolation Amplifier with
performance exceeding that required to distribute state-of-the-art atomic frequency standards. This new model
offers the same exceptional low phase noise with a larger frequency bandwidth, greater isolation and
improved stability. The inputs and outputs have a low VSWR to minimize environmental effects on frequency
distribution through long transmission lines.
The HPDA-15RMi may contain up to three HPDA modules with each module providing five isolated outputs.
Each module contains an output level monitor LED located on the front panel. All the outputs power levels are
monitored and compared to a preset threshold of +7dBm. If the signal level on any output drops below this
threshold, the monitor LED for that module will turn off indicating a fault condition. The instrument operates from
AC power and the option for DC power operation is available for some models. On the units with DC power
operation an open collector alarm is available on the back panel connector. The switch from AC to DC power
supply is automatic and glitch free ensuring uninterrupted continuous operation. The HPDA-15RMi comes in a
1U high, 19” rack-mount enclosure. The power requirements are 100 - 240 VAC and optional +12 to +36 VDC.
SpectraDynamics, Inc. ● 1849 Cherry Street Unit 2, Louisville CO, 80027 ● Phone (303) 665 1852 ● Fax (303) 604 6088
www.spectradynamics.com
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HIGH PERFORMANCE DISTRIBUTION AMPLIFIER, HPDA-15RMi
HPDA-15RMi Phase Noise Plot
-180
-170
-160
-150
-140
-130
-120
-110
-100
1 10 100 1,000 10,000 100,000
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