The BRAT®
RF Test SystemThe BRAT®
RF Test System
Power Meter
Frequency: 10 MHz to 18 GHz (options for frequencies as low as 100 KHz)
Power Range: -70 to -20 dBm (options for other ranges)
Power Sensor: 8481D Sensor
Dynamic Range: 50 dB in 10 dB steps
Display Units: W, dBm (absolute); %, dB (relative)
Accuracy Instrumentation: ±0.02 dB or ±0.5%
Power Meter Functions
Frequency: Allows entry of test signal frequency for Cal Factor selection
Offset: Allows power measurement to be offset by -99.99 dB to +99.99 dB
Resolution: Selectable resolution of 0.1, 0.01, and 0.001 dB in logarithmic mode; 1%, 0.1%, and 0.01% of full scale in linear mode
Auto Filter Mode: The meter automatically selects the required number of averages for the chosen range and resolution
Averaging: Selectable from 1 to 1024 readings (in powers of 2)
Duty Cycle: Displays peak power representation of measured RMS power for rectangular pulses
Limits: The meter automatically displays "Over Limit" or "Under Limit" when the power measured is outside the limit boundaries
Entry Range: -299.999 dBm and +299.999 dBm
Sensor Tables: Allows entry and editing of up to 10 Frequency versus Cal Factor sensor tables
Save/Recall States: Saves and recalls 10 complete HP 70100A operating states
Spectrum Analyzer
Frequency
Frequency Range: 100 Hz to 18 GHz
(100 KHz to 18 GHz in preamplifier mode)
Tunable in 1 Hz increments
Frequency Readout Accuracy
Span £ 10 MHz ´M1 ±[(freq readout ´freq ref accuracy)
+ 1.0% of Span + 10 Hz]
Span > 10 MHz ´M1
Sweep 20 ms ±[(freq readout ´freq ref accuracy)
+ 1.5% of span + 10 Hz]
Sweep 10 ms ±[(freq readout ´freq ref accuracy)
+ 2.5% of span + 10 Hz]
Frequency Span
Range: 0 to 18 GHz in 0.5% increments
Accuracy:
Span £ 10 MHz ´M1 ±[1% of span + (span ´freq ref acc)]
Span > 10 MHz ´M1
Sweep 50 ms ±[1.5% of span + (span ´freq ref acc)]
Sweep 20 ms ±[2.5% of span + (span ´freq ref acc)]
Sweep 10 ms ±[4.0% of span + (span ´freq ref acc)]
The BRAT® RF Test System is offered as an add-on option to the BRAT® Test System. The BRAT® RF Test System is housed in a rack that can be electrically and mechanically attached to the BRAT® Test System. The RF Test System add-on has been designed such that when added to the BRAT®, a fully integrated Test System with RF capabilities is configured. The RF Test System and its instruments are controlled by the system computer and operate in a totally automated fashion, utilizing MMS instruments in an open architecture environment. An MMS display provides manual control of MMS instruments when desired.
The BRAT® features two (2) RF synthesizers capable of -90 to +8 dBm power with AM, PM, FM, and sweep capabilities from 10 MHz to 18 GHz. Through integration with an RF Interface Unit (RFIU) equipped with the proper (optional) modules, higher power levels are achievable, as well as simulation of two tone, DSBSC, DSB, FSK, BPSK, BDPSK, OPSK, MSK, and fast frequency hopping. Accurate power and frequency management is guaranteed through stored correction factors for all RFIU paths and through system level calibration.
Frequency, power, PRF spectrum, modulation, and noise figure (optional spread spectrum and phase noise analysis) are available on the reconfigurable RF BRAT®.
The BRAT® RF Test System
Frequency Reference Accuracy
Aging: < 3 ´ 10-6/year
Temperature Drift: < 1 ´ 10-5
Spectral Purity
Frequency Range Noise Sideband Offset
100 Hz to 2.9 GHz -108 dBc/Hz 10 KHz
2.7 to 6.2 GHz -108 dBc/Hz 30 KHz
6.0 to 12.8 GHz -102 dBc/Hz 30 KHz
12.6 to 18 GHz -96 dBc/Hz 30 KHz
Line and System
Related Sidebands: < -65 dBc + 20 Log M1
Sweep Time
Range (Continuous): 10 ms to 1000 s
Accuracy: ±2%
Digitizing mode: swept freq spans: 15 ms to 355 s
fixed freq (zero span): 80 ms to
355 s with 800 point trace
Resolution Bandwidth (3 dB, synchronously tuned)
Range: 10 Hz to 300 KHz;
(1, 3, 10 Sequence 100 KHz to 3 MHz
and 10% Increments
Except 3 KHz to 10 KHz)
Accuracy: ±20%
Selectivity (-60 dB/-3 dB): Bandwidth Ratio
10 Hz to 3 KHz < 12:1
10 KHz to 3 MHz < 16:1
Video Bandwidth
Range: 3 Hz to 300 KHz
(1, 3, 10 Sequence) 300 Hz to 3 MHz
When set to maximum (300 KHz or
3 MHz), effective bandwidth is greater than specified
Accuracy: ±20% (characteristic)
Total Amplitude Range -139 to +30 dBm
-155 dBm to +20 dBM with preamp
Maximum Safe Input Power
AC Average Continuous: +30 dBm (> 10 dB attn)
+20 dBm with preamp
Pulse Power: 100 W, 10 ms pulse
( 40 dB attn)
DC: 0 V
±10 V with preamp
Spectrum Analyzer (continued)
Displayed Average Noise Level
(dBm) Frequency DANL
10 Hz Res BW, 0 dB 10 MHz to 2.9 GHz -139 dBm
Attn 3 Hz Video BW 2.7 to 12.8 GHz -136 dBm
Ref Level > -85 dBm 12.6 to 18 GHz -133 dBm
With Preamplifier 1.0 to 2.9 GHz -155 dBm
2.7 to 12.8 GHz -153 dBm
12.6 to 18 GHz -150 dBm
Gain Compression Level
(0 dB Input Attn) < 0.5 dB for signal levels
£ -10 dBm
With Preamplifier < 1 dB for signals < 0 dBm @ preamp output
Spurious Responses Input Spurious
For Input Level £ -40 dBm 100 Hz to 10 MHz < -60 dBc
at the Input Mixer, 10 MHz to 18 GHz < -70 dBc
Except as Listed,
Are Less Than These
Values (10 dB Attn)
Second Harmonic
Distortion for Band Second Harmonic
Mixer Input £ -40 dBm 100 Hz to 20 MHz < -60 dBc
(10 dB Attn) 20 MHz to 3.5 GHz < -70 dBc
3.5 GHz to 18 GHz < -100 dBc
Third-Order
Intermodulation Center Intermod Equiv
Distortion Freq Products TOl
for Two Signals, 100 Hz to 10 MHz < -66 dBc +3 dBm
Each £ -30 dBm 10 MHz to 2.9 GHz < -70 dBc +5 dBm
at Mixer (10 dB attn)
RF Synthesizers (2)
Frequency
Range: 1 to 18 GHz and 10 MHz to 18 GHz
Resolution: 1 KHz (option to 1 Hz)
Leveled Output Power
10 MHz to 1 GHz -90 dBm to +13 dBm
1 GHz to 18 GHz -90 dBm to +10 dBm
18 GHz to 20 GHz -90 dBm to +8 dBm
Resolution 0.01 dB
Accuracy: ±2 dB (all frequencies, power levels, and temperatures)
Flatness: ±0.5 dB
The BRAT® RF Test System
Harmonics < -55 dBc
Sub-Harmonics None
Non-Harmonic Spurious < -60 dBc
SSB Phase Noise 500 MHz -103 dBc/Hz
(10 KHz Offset) 2 GHz -91 dBc/Hz
18 GHz -73 dBc/Hz
External Pulse Modulation
On/Off Ratio: > 80 dB
Minimum Pulse Width: < 25 ns, 500 MHz to 18 GHz
< 100 ns, 64 to 500 MHz
< 1 ms, 10 to 64 MHz
Maximum Rise/Fall Time: < 10 ns, 1 to 18 GHz
< 15 ns, 500 to 1000 MHz
< 35 ns, 128 to 500 MHz
External Frequency Modulation
Rates: 1 KHz to > 1 MHz
Maximum Deviation: 10 MHz
Maximum Modulation
Index: > 300
External Amplitude Modulation
Type: Logarithmic AM
Depth: 0 to 60 dBc
Sensitivity: -10 dB/V
Step Response: < 5 ms for 50 dB step
Digitizing Oscilloscope
Repetitive Signal: 500 MHz
Bandwidth Rise Time: 700 ps
DC Gain Accuracy: ±1.25%
Resolution: ±0.4% (8-bit ADC)
±0.1% (averaging)
Voltage Measurement
Accuracy: Dual cursor ±(1.25% full scale
+ 0.032 divisions)
Single cursor ±(1.25% full scale
+ offset accuracy + 0.016 division)
Input Capacitance: 7 pF
Maximum Input Voltage: 1 MW ±250 V (DC + peak AC < 10 KHz)
50 W : 5 V rms
Dynamic Range
(DC + Peak AC): ±1.5 ´full scale from center of screen
Digitizing Oscilloscope (continued)
Channel Isolation
(Channels at Equal
Sensitivity): DC to 100 MHz 40 dB
100 to 500 MHz 30 dB
Time Base Range: 200 ps/div to 5 s/div
Time Base
Reference Accuracy: 0.005%
Time Base Resolution: 20 ps
Delta Time Accuracy: ±2% of s/div ±0.005% of Dt ±100 ps
Trigger Level Range: ±1.5 ´full scale from center of screen
Minimum Trigger
Pulse Width: 1.5 ns
Waveform Record Length: Display 501 points
Remote (HP-IB) 1024 points
RF Interface Unit (RFIU) Mainframe
Basic Configuration
8-slot wide RF mainframe (containing the necessary power supplies, motherboard, and cooling elements) and a 1-slot wide microcontroller module
Optional Configurations
RFIUs can be configured to provide an assortment of stimuli and perform a multitude of measurements including:
Stimuli
- High Power
- Low Phase Noise
- Signal + Noise
- Differential Phase
- Spread Spectrum
- Multipath Fade Simulation
- Angle of Arrival Simulation
- Noise
Measurement
- Logarithmic Detection
- Frequency Discrimination
- VSWR
- Power
- Phase Noise (Absolute and Additive)
- AM Noise
- Spread Spectrum Decorrelation