![]() | ||
![]() |
HP 85685A RF Preselector |
The HP 85685A RF preselctor is designed to operate with the HP 8566B and 8568B spectrum analyzers. The RF preselector adds tracking filters to reduce overloading from out-of-band signal and preamplifiers for improved system sensitivity over the 20 Hz to 2 GHz frequency range. The HP 85685A RF preselector has two input, 20 Hz to 50 MHz and 20 MHz to 2 GHz. There is also a bypassmode which is DC to 18 GHz. Input 1 has a built-in transient limiter for protection from transients generated by line impedance stabilization networks (LISN). The preselector is fully programmable over the HP-IB (IEEE-488).
Input Specifications Input 1 Input 2 Frequency Range: 20 Hz to 50 MHz 20 MHz to 2 GHz Bypass DC to 18 GHz Connector Type: BNC (50 ohm) Type-N (50 ohm) Fuse Blow Time: < 0.1 sec for > +35 dBm Maximum Save Input Power Average: +30 dBm (1 watt) Impulsive Signals: 100 watts peak for 10 µS pulse DC Voltage: 0 volts Standing Wave Ratio > 10 dB RFP Atten: < 1.5:1 < 1.5:1 0 dB Atten: < 1.5:1, nominal < 2.0:1, nominal RFP Atten Range: 0 to 50 dB (10 dB steps) Preamp Gain: 20 dB for 0 dB RFP atten Output Specifications Comb Generator Line Spacing: 10 kHz, 500 kHz, 1 MHz, 5 MHz (nominal) Line Amplitude: -40 to -60 dBm Preselctor Filters Start Frequency (MHz) Stop Frequency (MHz) Filter Type 0.0 .0655 Fixed tuned .0101 .0756 Fixed tuned .074 .2051 Fixed tuned .1975 .5252 Fixed tuned .525 1.0493 Fixed tuned 1.025 2.0736 Fixed tuned 1.96 5.8922 Variable 5.83 17.3643 Variable 17.33 28.8643 Variable 28.73 51.7987 Variable 51.73 97.8673 Variable 97.83 152.356 Variable 152.33 219.4389 Variable 216.33 333.7705 Variable
HP 85685A RF Preselector Opt 010 Rack Mount Slide Kit Opt 908 Rack Flange Kit without Handles Opt 910 Extra Manual Opt 913 Rack Flange Kit with Handles
Page Updated: Thursday June 19 16:14:27 UTC 1997