HP 8645A Agile Signal Generator, 250 kHz to 1030 MHz

The HP 8645A agile signal generator combines high performance with frequency agility for new fast-switching test requirements. These capabilities are important for performance testing of such devices as frequency agile radios and surveillance receivers. Besides extending traditional receiver testing to agile applications, the HP 8645A can be used to create complex signal simulations involving several modulation types and frequency agility. These complex RF signals can quantitatively exercise a receiver's vulnerability to a jamming transmission. The HP 8645A can also be a fast-switching stimulus needed to decrease production test times. The high performance and frequency agility of the HP 8645A provide capability for both static and agile test requirements with just one calibrated signal generator.

[ Features ]

High performance in-channel and adjacent channel measurements, both in static and agile operation
Simultaneous FM, AM, and pulse modulation
Maintains signal performance while switching frequencies as fast as 15 microsec from 128 to 2060 MHz
Flexible control of frequency switching using HP-IB from the front panel or TTL connectors from the rear panel

[ Specifications ]

Frequency Specifications
Range:                       251.46485 kHz to 1030 MHz
                             251.46485 kHz to 2060 MHz with Option 002 or
                             with HP 11845A 2 GHz Retrofit Kit installed
Frequency Bands:             The exact endpoints of each frequency band can
                             be determined by dividing the 1030 to 2060 MHz
                             band by two for each band decrease.  The
                             specifications use approximate endpoints.
Phase Offset:                Adjustable in 1° increments.
Reference Oscillator Stability, Option 001: 
                             <5 x 10(^-10)/day aging


Fast Hop Operation
Frequency Switching Time
   128 to 1030 MHz:          <15 µsecond
   8 to 1030 MHz:            <85 µsecond
   0.25 to 1030 MHz:         <500 µsecond
   Opt 002:                  Add 5 µsecond
Frequency Hop Range:         0.25 to 2060 MHz
                             With FM on, limited to any three consecutive
                             carrier frequency bands.
Accuracy
Frequency Accuracy¹:         ±2 ppm of carrier frequency
Amplitude Accuracy:          ±1 dB, >-127dBm output
Channel and Sequence Tables: In Fast Hop each specific frequency and amplitude
                             to be output is entered into a Channel Table. The
                             order of channels to be output is entered in a
                             Sequence Table.
Maximum Number of Channels:  8000
Maximum Number of Channels in Sequence Table:
                             8000
Hop Rate Range:              Fixed rates from 8 Hz to 50 kHz using internal
                             timer. An external input allows more
                             range and variable rates.
Dwell Time Range:            Fixed times of 6.4 µsec to 99 msec using the
                             internal timer.  External input allows longer and
                             variable dwell.
Learn Cycle Time:            Typically, 10 sec to 3.5 minutes, depending on sequence 
                             size
Fast Hop Bus:                Allows real-time selection of any channel for
                             output. Typically, frequency switching time
                             increases by 5 µsecond.
Modulation:                  Internal or external AM, FM, or simultaneous AM/FM
Output Level:                Allowed amplitude variation of all channels
                             entered is 0 to 20 dB.  Output level is reduced
                             by >60 dB while switching between channels
                             External dc AM can be used to shape the output.

¹Typically +2 ppm of carrier frequency multiplied by the temperature change
in °C must be added if ambient temperature changes occur between the learn
operation and the conclusion of frequency hopping.  FM at minimum deviation.


Spectral Purity
SSB Phase Noise (CW, AM, or FM Operation)²
			
                     Standard Operation         Fast Hop
Carrier         ---------------------------     Operation
Frequency       20 kHz          100 kHz         20 kHz
(MHz)           (dBc/Hz)        (dBc/Hz)        (dBc/Hz)
----------------------------------------------------------
1030 to 2060:   -120            -127            -116
515 to 1030:    -127            -134            -123
257 to 515:     -132            -137            -128
128 to 257:     -136            -140            -133
64 to 128:      -139            -141            -137
32 to 64:       -141            -141            -139
16 to 32:       -142            -142            -141
8 to 16:        -143            -143            -142
4 to 8:         -144            -144            -143
<4 MHz:          -144            -144            -144

Harmonics:                   <-30 dBc, output <=10 dBm
   Opt 002:                  output >8 dBm
   0.25 to 1030 MHz:         <-30 dBc
   1030 to 2060 MHz:         <-25 dBc
Subharmonics
   <515 MHz:                  None
   515 to 1030 MHz:          <-60 dBc
   >1030 to 2060 MHz:         <-40 dBc
Nonharmonics:                >20 kHz offset³
   <1030 MHz:                 <-100 dBc
   >1030 to 2060 MHz:         <-94 dBc

²FM at minimum deviation.
³Typically, nonharmonic spurs at all offsets are <30 dB above the instrument's phase 
noise level as measured in a 1 Hz bandwidth.


Residual FM⁴ (CW, AM, FM⁵ operation)

                                   Post Detection Bandwidth
			-----------------------------------------
Carrier Frequency       0.3 to 3 kHz            0.05 to 15 kHz
(MHz)                   (Hz rms)                (Hz rms)
-----------------------------------------------------------------
0.25 to 257:            <1                      <1.2
257 to 515:             <1.2                    <2
515 to 1030:            <2                      <4
1030 to 2060:           <4                      <8

Residual AM:                  <0.01% AM rms, 0.3 to 3 kHz post detection BW
Typical SSB AM Noise Floor, Offsets >100 kHz:
   0.25 to 1030 MHz:          <-157 dBc/Hz at +16 dBm output
   1030 to 2060 MHz:          <-150 dBc/Hz at +13 dBm output

⁴Specified for 48 to 63 Hz power line.  Typical for 400 Hz power line
and Fast Hop operation.
⁵Deviation <0.1% of maximum available


Output Specifications
Maximum Level
   Standard
    0.25 to 1030 MHz:         +16 dBm
   Option 002
    0.25 to 1030 MHz:         +14 dBm
    1030 to 2060 MHz:         +13 dBm
Minimum Level:                -137 dBm
Absolute Accuracy:            ±1 dB, output >=-127 dBm
Reverse Power Protection:     50 watts from a 50 ohm source, 25 Vdc
Third Order Intermodulation:  <-50 dBc, outputs <8 dBm
Typical Output Level Overrange:
                              2 dB more than maximum level
Typical SWR and Output Impedance:
                              <1.7:1 at <-2 dBm, 50 ohms


Modulation Specifications
External Modulation Input:    Coupling is ac or dc for AM, FM, and phase
                              modulation. Pulse modulation input is dc coupled.
                              Displayed deviation or depth corresponds to ą1V
                              external input.
Simultaneous Modulation:      AM/FM, AM/Phase, AM/Pulse, FM/Pulse,
                              Phase/Pulse, AM/FM/Pulse, AM/Phase/Pulse
Simultaneous Internal/External Modulation:
                              FM and Phase


Amplitude Modulation
Depth:                        0 to 99.9%, for output <±7 dBm
AM Indicator Accuracy:        ±(6% of setting +2% AM), up to 90% depth and
                              1 kHz rate for carrier frequencies >1 MHz.  When
                              amplitude level is varied up to -5 dB from the
                              constant learned value during Fast Hop: ±(7% of
                              setting + 1% AM) up to 80% depth, 1 kHz rate
Distortion, at 400 Hz and 1 kHz Rates

                                         Carrier Frequency
Depth                   ----------------------------------------------
                        0.25 to 1030 MHz          1030 to 2060 MHz
----------------------------------------------------------------------
0 to 30%:               <2%                        <5%
30 to 70%:              <3%                        <5%
70 to 90%:              <5%                        <8% 

3 dB Bandwidth⁶
   0.25 to 8 MHz:             >5 kHz
   8 to 128 MHz:              >50 kHz
   128 to 2060 MHz:           >100 kHz
Incidental Phase Modulation:  <0.2 rad peak, at 30% depth and 1 kHz
External AM Input Impedance:  600 ohms

⁶Lower 3 dB bandwidth limit is 0 Hz for dc coupling and typically 
20 Hz for ac coupling.


Frequency Modulation
FM Deviation and Rate
1030 to 2060 MHz	
   Standard:                  20 MHz, maximum FM peak deviation
   Fast Hop:                  3.52 MHz, maximum FM peak deviation
Maximum FM Rate (3 dB Bandwidth)
515 to 1030 MHz and above:    10 MHz
                              Divide rate and deviation by two for each
                              frequency band decrease.			
FM Indicator Accuracy:        ±10%
   Standard <50 kHz Rate:     <10% of maximum deviation
   Fast Hop <50 kHz Rate:     <50% of maximum deviation				
FM Distortion:                Rates 20 Hz to 100 kHz
   Standard:                  <2.7%, deviation <2% of maximum available
   Fast Hop:                  <10% of maximum deviation
Carrier Frequency Accuracy in FM
   Standard:                  ±0.4% of deviation setting, ac or dc coupled.
   Fast Hop:                  Typically add 1% of deviation
Incidental AM:                <0.5%, deviation limited to <6% 
                              of maximum or 20 kHz
Typical External FM Group Delay
   20 Hz to 20 kHz:           30 µsecond
   >200 kHz:                  <1 µsecond
   Fast Hop:                  <1 µsecond
Typical External FM Input Impedance:
                              50 or 600 ohms

Pulse Modulation
On/Off Ratio:                 >35 dB
Rise/Fall Time:               <100 ns, between 10% and 90% response points
Maximum Pulse Repetition Frequency:
                              1 MHz
Minimum Pulse Width:          0.5 µs
Typical Output Level Accuracy:
                              ±2 dB
Typical External Input Levels and Impedance
   On:                        >3.0V peak
   Off:                       <0.8V peak
   Damage Level:              >=2 + 10V peak, 600 ohms


Internal Modulation Source
Waveforms:                    Sine, square, sawtooth, and white Gaussian noise
Frequency Range
Sine, White Gaussian Noise:   0.1 Hz to 400 kHz
Square, Sawtooth:             0.1 Hz to 50 kHz
Frequency Accuracy:           Same as internal reference oscillator
Output Level:                 Typically, 1 V(pk) max. into 600 ohms
Accuracy:                     +20 mV
Typical Output Level Resolution:
                              2 mV Typical impedance: 600 ohms
Distortion:                   <0.1%, output at 1V peak and <=15 kHz


Frequency Sweep
Phase Continuous Sweep:       Linear sweep with times from 10 ms to 10 s,
                              not dependent on span. Maximum span is 40 MHz
                              from 1030 to 2060 MHz frequency band, divided
                              by two for each band decrease.
Fast Hop Sweep:               Linear or log stepped with times from 10 ms to
                              100 s. Number of steps varies with time selected.
   128 to 2060 MHz:           30 µs
   8 to 2060 MHz:             170 µs
   0.25 to 2060 MHz:          650 µs
Sweep Control and Markers
   X-axis:                    0 to +10V
   Z-axis:                    +5V retrace +1V trace, 0V markers, three markers
                              available


General Specifications
Remote Control:               HP-IB (IEEE-488.2-1987). The control language
                              used is the Hewlett-Packard Systems Language
                              (HP-SL). All front-panel functions except power
                              switch and knob. A unique Fast Hop bus interface
                              accepts TTL levels for frequency agile control.
Operating Temperature Range:  0 °C to +55 °C F
Leakage:                      Meets Mil Std 461B RE02 and FTZ 1046
Storage Registers:            10 full function and 40 freq./ampl. locations
Memory Erasure:               All memory contents according to Mil Std 380-380
Dimensions:                   426 mm W x 177 mm H x 624 mm D
                              (16.8 in x 7 in x 24.6 in)
Net Weight:                   31 kg (69 lb)
Shipping Weight:              42 kg (95 lb)

Declarations of Conformity

If you have Adobe's Acrobat Reader already available on your system, please click on the icon provided below to print or view the specifications.

If you do not have the Adobe Acrobat Reader necessary for viewing PDF documentation, download your free Acrobat Reader, and then click on the icon below.

European Regulatory Declarations of Conformity.

[ Ordering ]

HP 8645A Agile Signal Generator¹ Opt 001 High Stability Timebase Opt 002 2 GHz Output Opt 003 RF Connectors on Rear Panel Only Opt 907 Front Handle Kit (5062-3990) Opt 908 Rack Flange Kit (5062-3978) Opt 909 Rack Flange Kit with Front Handles (5062-3984) Opt 910 Provides an additional operation/calibration manual (08645-90023) and 2 service manuals (08645-90104) Opt 915 Add Service Manual (08645-90104) Opt W30 Extended Repair Service 08645-61116 Service Kit 9211-2662 Transit Case 1494-0059 Non-Tilting Rack Slide Kit 1494-0063 Tilting Rack Slide Kit ¹HP-IB cables not included.

[ Key Literature ]