HP 70900B Local Oscillator

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The HP 70900B is the master control module for the modular spectrum analyzers and surveillance receivers. It is also a component of the lightwave signal analyzers. The HP 70900B LO has two main functions in the HP 70000 spectrum analyzers: as the synthesized local oscillator (LO) and as the master control module for the system. As a spectrum analyzer local oscillator, it affects phase noise, stability, and frequency accuracy. The HP 70900B is the reason that the analyzer has excellent phase noise performance of -108 dBc/Hz at 10 kHz offset from the carrier. The synthesis technique has millihertz resolution for accurate frequency control. The fast tuning speed of the LO directly relates to the tuning speed of the analyzer. As the master control module, the HP 70900B determines system features, slave module control, command processing speed, and HP-IB speed. The combination of hardware and processing power provides fast tuning for surveillance applications and automatic testing.


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General Specifications

300 MHz Calibrator
Output:                       BNC (f), 50 ohms (nominal)
Output Power:                 10 dBm  ±0.3 dB
Frequency Accuracy:           300 MHz x frequency reference accuracy
External Frequency Reference Input:
                              SMB (m), rear panel, 50 ohms (nominal),
                              100 MHz
Power Required:               0 dBm ±3 dB maximum
Maximum Phase Noise:          -150 dBc/Hz at >=10 kHz offset
Maximum Spurious:             <phase noise or -115 dBc, whichever is greater
Sweep Output/Input:           SMB (m), rear panel, 0 to 10 V for sweep >=50 ms
Accuracy:	              2%
Tune + Span Output:           SMB (m), rear panel, 4.5 to 9.9 V (1.5 V/GHz)
HSWP Output/Input:            SMB (m), rear panel, TTL open collector
Sweep Condition:              low = not ready to sweep
Maximum Delay:                200µs from HSWP high to sweep
Maximum Current Draw:         16 mA
HP-IB Codes:                  SH1, AH1, T6, L4, SR1, RL1, DC1, PP0,
                              DT1, E2, C1


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HP 70900B     Local Oscillator
   Opt 1BN    Certificate of Calibration
   Opt lBP    Certificate of Calibration and Data
   Opt 512    1 MB Memory
   Opt 910    Extra User's Manual
   Opt 915    Service Manual Set
   Opt W30    Two Additional Years of Return-to-HP Warranty (3 years total)
HP 70860A     CPU and RAM/ROM Upgrade Kit1
HP 70861A     RAM/ROM Upgrade Kit1

When configured as a spectrum analyzer, the HP 70900B requires an
IF Section and either an RF section or an HP 70907A/B external mixer
interface module.

1Existing HP 70900A/B modules with firmware version B.04.02 (920325)
and earlier may require upgrade HP 70860A to operate system components.
Modules with later version firmware may use upgrade HP 70861A.
For more information see service note 70900A-14L/70900B-01G.

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