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2087-XXX Downconverter, L-Band, Fixed Frequency

The 2087-XXX Downconverter converts an X.XX GHz L-Band signal (0.95-1.75 GHz) to IF with no spectrum inversion, low group delay, and flat frequency response. The L-Band input is mixed with a fixed frequency local oscillator (LO) signal to 70 or 140 MHz (specified by the customer). The L-Band frequency is fixed and specified by the customer. A green front panel LED lights when DC power is applied and a red LED lights if the phase lock loop for the LO is in alarm. Connectors are BNC female for the IF output and Type F female for the RF input. Power is provided by a 120 ± 10% VAC, 60Hz, wall mount power supply. The 2087 Downconverter is housed in a 4.7” wide X 1.75” high X 12.5” deep aluminum chassis. The 2087 has the option to be mounted on an 1 3/4” X 19 “ rack mount panel (option -R). The 2087 can also be powered by the 2000-01 switching power supply using option -C which includes no power supply. Option -A includes automatic gain control (AGC) for a -25 to -65 dBm input range, an AGC/MGC switch, MGC adjust, and AGC gain monitor. Option -S provides a SAW IF filter.


Front (with AGC and SAW options) and Rear Panel


Block Diagram

Equipment Specifications*
Input Characteristics
Impedance/RL 75 ohms/12dB
Frequency Fixed frequency specified by customer (0.95 to 1.75 GHz)
Level -20 to -10 dBm (-65 to -25 dBm, option -A)
Input 1dB comp. 0 dBm
Output Characteristics
Impedance/RL 75 ohms/18dB
Frequency 70 or 140 MHz
Level -20 to -10 dBm (-25 dBm, option -A)
Channel Characteristics
Gain 0 ± 1 dB (0 to +40 dB, AGC, option -A)
Spurious Response < -45 dBC
Image Rejection > 45 dB
Frequency Response ±0.5dB, 36 MHz BW or determined by SAW filter (option -S)
Group Delay, max 0.01 ns/MHz2 parabolic; 0.03 ns/MHz linear; 1 ns ripple or determined by SAW (option -S)
Synthesizer Characteristics
Frequency Accuracy ±25 kHz max over temp.
Frequency Step N/A - fixed tuned
Phase Noise (dBC/Hz) < -70 @ 1.0kHz; < -80 @ 10kHz; < -95 @ 100kHz; < -110 @ 1MHz
Controls/Indicators
AGC/MGC select Toggle Switch (option -A)
MGC Gain adjust Multi-turn potentiometer (option -A)
AGC Voltage/Gain Test Points (option -A)
Power Green LED
Alarm Red LED; Open collector output
Other
RF Connector Type F (female)
IF Connector BNC (female)
Size, Bench Top 4.7” wide X 1.75” high X 12.5” deep
Size (option -R) 19 inch 1RU standard chassis, 1.75"H X 13.0"D
Power 90-260 VAC, 47-63 Hz, 45W max
Options
-R Rack Mounted
-C No power supply, use with 2000-01 power supply
-S SAW IF filter, 36 MHz unless otherwise specified by customer
-A Automatic Gain Control (AGC) for -25 to -65 dBm input range

*+10 to +40 degrees C; Specifications subject to change without notice