HP 70910A Wide Bandwidth RF Section, 100 Hz to 26.5 GHz

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The HP 70910A RF section provides coverage from 100 Hz to 26.5 GHz. This RF section is used in the HP 71209A Opt 001 spectrum analyzer and the HP 71910A surveillance receiver. Diode-pair mixing provides lower conversion loss, allowing the spectrum analyzer to have sensitivities that compete with fundamentally mixed designs. The sensitivity is also improved by the use of a built-in preamplifier before the first mixer (in the microwave path). The HP 70910A adds the switchable bypass path around the yig-tuned filter (YTF) for making very sensitive measurements when extraneous signals are not a problem. Also, the HP 70910A ensures that the minimum bandwidth through the YTF is greater than 36 MHz and the minimum bandwidth through the low-band path is greater than 45 MHz. For millimeter measurements, this RF section includes the extra switching and signals necessary to connect external mixers, including HP 11974 series preselected mixers. A switched LO is routed to the front panel for connection to an external mixer. Rear panel outputs include the 3 to 6.6 GHz LO, and IFs at both 321.4 and 21.4 MHz. The spectrum analyzer adjusts gain within the module to keep a constant relationship between the power out of the input attenuator and the IF outputs.


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General Specifications

RF Input: APC 3.5, 50 ohms (nominal) LO Emissions (10 dB attn) Center Total Signal Power Frequency Preselector OFF ---------------------------------- 0-2.9 GHz < -80 dBm 2.9-26.5 GHz < -50 dBm VSWR (>=10 dB attn) Frequency VSWR (nominal) ------------------------------ 0-6.2 GHz <1.4:1 6.0 - 26.5 GHz <2.0:1 321.4 MHz External IF Input: SMA (f), 50 ohms (nominal) Return Loss: >=14 dB from 271.4 to 371.4 MHz Maximum Safe Input Level ac: 0 dBm dc: ą3v Noise Figure: <7.0 dB SHI: > (+ 30 - CL) dBm TOI: > (+ 10 - CL) dBm (CL = external mixer conversion loss) Tune and Span Output: BNC (f), >10 k ohms load impedance Voltage Range: 0 to + 13.25 V Tuning Sensitivity RF input selected: 0.5 V/GHz RF frequency EM input selected: 1.5 V/GHz LO frequency Preselector DAC: (8 bit DAC) Voltage Range RF Input Selected: N=1 +13.3 mV N=2 +26.7 mV N=4 +53.3 mV External Mixer Input Selected:+40.0 mV First LO Output: SMB (f), 50 ohms, VSWR < 2.1:1 Frequency Range: 3.0 to 6.6 GHz Output Power 25°C + 5°C 0°C - 55°C ------------------------------------------ Minimum 14.5 dBm 14.0 dBm Maximum 17.0 dBm 17.5 dBm 321.4 MHz IF Output: Rear Panel SMB, (m), 50 ohms (nominal) Bandwidth RF Frequency -3 dB Bandwidth -------------------------------------------------- 0-2.9 GHz >48 MHz 2.7 - 26.5 GHz >36 MHz (preselector ON) 2.7 - 26.5 GHz >200 MHz (preselector OFF) EM Input >200 MHz Level Return Loss: -5 dBm; for 0 dBm RF input and 10 dB atten 14 dB, at 321.4 ± 50 MHz


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HP 70910A	RF Section
   Opt 098	Controller Board Upgrade Kit HP 70860Aš
   Opt 099	RAM/ROM Upgrade Kit HP 70861Aš
   Opt 1BN	Certificate of Calibration
   Opt lBP	Certificate of Calibration with Data
   Opt 910	Extra User's Manual

šIf this module will be installed into an existing system, a firmware
upgrade may be required. Modules with firmware version B.04.02 (920325)
and earlier require upgrade HP 70860A. Modules with later
version firmware may use upgrade HP 70861A. For more information
see service note 70900A-14L / 70900B-01G.

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Page Updated: Wednesday January 07 23:17:53 UTC 1998