SIGNAL MEASUREMENT Obsolete Product - for Reference Only RF Receiver & Signal Analyzer Model 2551 n 10kHz to 30MHz Tuning Range with n ISB, LSB, USB, CW, AM, FM and FSK 1Hz Tuning Resolution Detection Modes n Low LO Phase Noise n Phase-locked Local Oscillators for Multiple Channel Applications n Quadrature Digital IF Output (I&Q) n 51 Standard Bandwidths The 2551 Receiver is a high performance spurious or harmonic content, the Model be built onto an embedded computer. VXIbus 10kHz to 30MHz DSP Receiver. 2551 may be used as a signal level The gathered data can be sent over Systems using instrumentation can now analyzer. The cost savings over a radio or land line to a central location. include the latest in receiver technology. spectrum analyzer are significant. All of your LF/HF communication as well Diverse Applications as Test & Measurement requirements are Automated RF Monitoring Radio frequency occupancy monitoring, accomplished utilizing Digital Signal Applications that require frequency surveillance, propagation studies, Processing (DSP) design for superior occupancy or remote monitoring can direction finding and RF interference performance, higher reliability and lower now utilize up to 12 Model 2551’s in a locating are some applications which are cost. single mainframe. This “system” may be typical for this diverse receiver. powered from a 24VDC supply and Signal Analyzer located in the back of a vehicle or In production ATE systems, where known unmanned location. A program to control frequencies need to be checked for and gather data from the receivers can For your local Racal Instruments Sales Office see page 173. -95- Obsolete Product - for Reference Only This DSP receiver offers significant Sweep through up to 125 user-selectable improvements over analog receivers. bands with dwell and bridge times of up These improvements include increased to 9 seconds. Step size may be specified stability and precisely controlled filter in sweep mode. characteristics which translates into greater reliability and performance. Complex DSP Functions in Flash Memory Harness the power of DSP technology by Flexible Scan and Sweep Modes loading the 2551’s on-board flash with Scan up to 250 pre-selected channels at user-specified demodulation schemes, a preset scan rate (up to 100 ch/s) and filtering or complex functions. Flash squelch level (ranging from 6 to 30dB). memory may be re-programmed any Receiver Control Panel from Channels may be scanned with dwell time over the VXIbus transforming the VXIplug&play Soft Front Panel and bridge times of up to 9s. Each 2551 into a custom receiver for special channel may be individually excluded applications. If special access modes are from sweep by setting skip flags to skip required for custom DSP commands, the up to 100 channels. receiver’s command set itself may be modified in a separate on-board flash memory. 2551 LF/HF DSP Receiver Simplified Block Diagram This LF through HF receiver is a triple-conversion superheterodyne design in which the final IF filtering and demodulation are accomplished with Digital Signal Processing (DSP) for superior accuracy and flexibility. The three Intermediate Frequencies (IFs) are 40.456MHz, 456kHz, and 24kHz. Having the first IF above the entire tuning range assures spurious-free reception. At the third IF the signal is converted to digital form. A DSP chip then provides fine tuning, IF filtering to the selected bandwidth and AM, FM or product detection according to the operating mode. Fifty-one bandwidths are offered from 100Hz to 16kHz. The demodulated signals are converted back to analog form for output to a speaker, stereo headphones or balanced lines. -96- For your local Racal Instruments Sales Office see page 173. Obsolete Product - for Reference Only 2551 Specifications FREQUENCY SCAN MODE Decay Time Range (nominal for 50dB change) Tuning Range Channel Presets 0ms to 4s (programmable) 10kHz to 30MHz (0-10kHz with 250 Dynamic Range reduced performance) Channel Parameters Stored Output level held within ±1dB over a Tuning Step Size Resolution Frequency Detection Mode BW 110dB range. 1Hz to 10MHz De-emphasis Squelch Value BFO Threshold Synthesizer Tuning Speed (maximum) Step Size Dwell Time AGC Set to -112 dBm ∆f<100kHz: <1ms AGC Decay Bridge Time MGC Dump Time ∆f<1MHz: <1.5ms Skip Flag IF Shift <2ms ∆f<10MHz: <2ms Scan Range AM Attack and Decay Time (50dB change) Receiver Tuning Time 1 to 250 channels 50ms (nominal) <10ms Scan Rate Tuning Accuracy 1 to 100 channels/s MANUAL GAIN CONTROL (MGC) External Frequency Standard Dynamic Range (10MHz): Tuned frequency equal to SWEEP MODE 127dB accuracy of external standard in Sweep Types Resolution ppm. Single-band: Sweep between 2 1dB consecutive channels DETECTION MODES Multi-band: 2 to 125 sweep bands IF SECTION AM, FM Sweep Rate First IF All bandwidths 1 to 100 channels/s 40.456MHz USB LSB, CW Second IF Bandwidths ≤6kHz RF SECTION 456kHz ISB Input Impedance Third IF 2.8kHz bandwidth per sideband 50Ω 24kHz Input VSWR Fourth IF (DSP) SIGNAL LEVEL ANALYSIS < 1.5:1 (typical) 51 Standard Bandwidths from 100Hz Signal Level Range <2.5:1 (maximum at tuned frequency) to 16kHz -110dBm to 0 dBm Sensitivity of 10dB SINAD (above 1.6MHz) Shape Factor (3dB to 60dB) Signal Level Resolution AM (6kHz BW): -105dBm, 50% Better than 2:1, 400Hz and above 1dB modulation Inband Ripple (max) CW (500Hz BW): -122dBm 1dB SQUELCH CONTROL SSB (3kHz BW): -113dBm (Carrier-to-noise ratio for SCAN and SWEEP modes) FM (5kHz deviation, 400Hz modula- INTERFERENCE IMMUNITY Programmable Range tion, 16kHz BW): IF Rejection 113dB -98dBm for 20dB SINAD >100dB Resolution Noise Figure (above 1.6MHz) Image Rejection 1dB 15dB (max) >100dB Cross Modulation DWELL & BRIDGE RF PROTECTION Unmodulated desired signal of 50dB reflective attenuation. Activates CONTROL at signal levels between +10dBm -60dBm together with a modulated (For SCAN and SWEEP modes) (30% AM at 1kHz) undesired signal and +20dBm. Protects from input of -10dBm, spaced 100kHz apart, will Dwell Time signals up to 10 Watts. Automatic Time to “dwell” on a scanned produce less than 10% cross reset. modulation of the desired signal. channel or swept frequency with a signal strength exceeding the Blocking squelch threshold. PRESELECTOR Attenuation of a desired RF signal of Dwell Time Range Eight one-half octave bandpass -60dBm by an unmodulated signal of 0 to 9s preselector filters used from 1.6 to +10 dBm spaced 100kHz away is Bridge Time 30MHz. Two lowpass filters for less than 3dB. frequencies <1.6MHz. Filter selection Synthesizer Phase Noise If a scanned channel or swept is automatic with tuned frequency (@1kHz spacing, nominal) frequency’s signal strength drops selection. -110 dBc/Hz below the squelch threshold during dwell, this is the amount of time the Oscillator Re-radiation (1GHz) receiver waits for the signal to return AUTOMATIC GAIN -110dBm before it leaves the channel. CONTROL (AGC) Spurious Responses (equivalent or less for -50dBm input signals) Bridge Time Range SSB & CW Attack Time ≤ -120dBm 0 to 9s Fast: <2ms for 50dB change (sweep Generated Spurs (above 1.6MHz) and scan only) No more than 5: <-110dBm Nominal: <10ms for 50dB change All other spurs: <-120dBm For your local Racal Instruments Sales Office see page 173. -97- 2551 Specifications Continued INTERMODULATION VXIbus INTERFACE DATA ENVIRONMENTAL DATA (Single-slot, message-based, VXIbus 1.4 compliant) Temperature Range DISTORTION Drivers Operating: 0 oC to 50oC Second Order Intercept LabVIEW, LabWindows/CVI, Storage: -40oC to +71oC 100kHz -1.6MHz: +45dBm VXIplug&play (WIN, WIN95, WIN NT Humidity 1.6MHz - 30MHz: +60dBm Frameworks) 10% to 90% non-condensing Third Order Intercept (typical) Status Lights EMI +30dBm Red: Self-test failure Equipment designed to intent of the Inband Weight applicable requirements of MIL-STD -50dBc (2 equal tones separated by 5 lbs. (2.3kg) 461/462 as a guide. >1kHz, input level up to -20dBm) Peak Current & Power EMC (Council Directive 89/336/EEC) Consumption CISPR 11 (Class A), IEC801-2,3,4 FRONT PANEL INPUTS +12 +5 -5.2 -12 Safety (Low Voltage Directive 73/23/EEC) Antenna I Pm 1.1A 1.2A .06A 0.5A EN61010-1, IEC1010-1, UL31111-1, SMA (50Ω) Total Power: <26 Watts CSA22.2#1010 1st, 2nd, 3rd LO (jack) MTBF (MIL-HDBK-217F, Naval Sheltered) Coaxial D-sub 11,000 hours External Reference SMB male: 10MHz, 0dBm The CE Mark indicates that the product has completed and FRONT PANEL OUTPUTS passed rigorous testing in the area of RF Wideband IF (30dB gain@<-60dBm inputl) Emissions, Immunity to Electromagnetic Disturbances and complies with Euro- SMA female (fc =456kHz, BW=30kHz) pean electrical safety standards. Narrowband IF (-10dB signal level) SMA female, (fc =455kHz) 1st, 2nd, & 3rd LO (plug) Coaxial D-sub Stereo Headphone Jack (0 to 5Vpk-pk signal level) 1/8" connector: 8Ω DSP Signals (12-pin, female circular connector) Line audio: 600Ω balanced (0dBm ±3dBm) Alternate Line Audio: 600Ω balanced (2nd ISB signal) Wideband Video: 3V pk-pk ,75Ω Digital I&Q: TTL Obsolete Product - for Reference Only ORDERING INFORMATION Model Description Part Number 2551 LF/HF DSP Receiver RVXI-3250 http://www.racalinst.com -98- For your local Racal Instruments Sales Office see page 173.
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