HP 85685A RF Preselector

Product Summary

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).

Product Features

• Operates with the HP 8566B and 8568B spectrum analyzers

• Reduces overloading from out-of-band signal

• Improved system sensitivity

• Built-in transient limiter

Product Specifications

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

Product Ordering Information

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

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Page Updated: Thursday June 19 16:14:27 UTC 1997