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| SSF-2 Series SINGLE SIDEBAND MODULATOR 10 to 4000 MHz / Image Rejection to 30 dB / Internal Second Quad / High Sideband Rejection PRINCIPAL SPECIFICATIONS Model LO Center Bandwidth, Number Frequency, fo MHz SSF-2F-***/ 10 - 1000 MHz 10% of fo SSF-2L****/ 1000 - 4000 MHz 10% of fo Outline Style F L GENERAL SPECIFICATIONS (when used as an Up Converter) RF/IF Input Characteristics Impedance: 50 nom. VSWR: 1.5:1 max. RF Power Level: +10 dBm IF Power Level: 0 dBm nom. IF Bandwidth: up to an octave RF Bandwidth: 10% Output Characteristics Conversion Loss: Sideband Suppression: Operating Temperature: 9 dB max. 25 dB min. -- 55 to +85C A complete Model Number will be assigned with center frequency (***=fo) and slash number, once a full specification is established with factory. SIDEBAND REJECTION 50 for a given Amplitude and Phase Balance 45 General Notes: 1. Single Sideband Modulators are integrated networks composed of an in-phase power divider, two double balanced mixers and two 90quadrature hybrids. The primary function of the circuit is to amplitude modulate a carrier such that all the energy is in either the upper or lower sideband. 2. These units are especially useful in modulator applications where the desired and undesired RF sidebands are so close in frequency that it is not practical to use a bandpass filter to separate them or where minimum group delay is required. 3. By vector subtraction, the undesired sideband is canceled within the unit (internally terminated) and the desired sideband is reinforced at the output. The level of cancellation is usually expressed as sideband rejection ratio in dB. 4. The schematic diagram shows how the desired receiver signals from the two mixers are combined in-phase at the real (RF/LO) port, while the undesired spurious signals cancel each other out. At the image port the reverse occurs and the unwanted sideband signal is absorbed by the load resistor. (Continued, next page) 40 35 Image Rejection Ratio Ampl. Balance 0 dB 0.25 0.5 0.75 1.0 30 25 20 2.0 dB 15 0 0.5 1 1.5 2 2.5 3 Phase Error (degrees) 26Mar96 F rf t e if r to c n a tM ERRI AC /41 Faifel Pl,W estCal el,NJ,07006 / 973o ur h r n o ma in o t c M ri d . dw l 5751300 /FAX 973- 0531 575- SSF-2 Series SINGLE SIDEBAND MODULATOR 10 to 4000 MHz / Image Rejection to 30 dB / Internal Second Quad / High Sideband Rejection SSF-2L series F-Package Outline NOTES: 1. Tolerance on 3 place decimals .010(.25) except as noted. 2. Dimensions in inches over millimeters. 3. Dimensions marked with * apply only at body. 4. All unmarked pins are case ground. L- Package Outline NOTES: 1. Tolerance on 3 place decimals .010(.25) except as noted. 2. Dimensions in inches over millimeters. 3. Dimensions marked with * apply only at body. 4. All unmarked pins are case ground. 5. Nominal Weight: 0.55 oz (15.4 g) General Notes (Continued) 5. From a practical standpoint, there are may considerations affecting sideband suppression, such as the phase and amplitude balances of the individual components chosen, mixer sensitivity, VSWR interaction, bandwidth, etc. 6. The most useful guide to how much signal rejection may be expected for a given phase error and amplitude balance is shown in the graph. These curves allow determination of the trade-off between the allowable phase and amplitude errors for a desired image rejection ratio. 7. Merrimac offers a wide range of Single Sideband Modulators to a variety of specifications. The parameters quoted for the SSF series are a basis only for more exacting requirements. The the minimum image rejection and package size will be impacted most by an increase in bandwidth requirements. 8. Merrimac Single Sideband Modulators comply with applicable portions of MIL-M-28837 and can be supplied screened for additional specifications you specify for military and aerospace applications requiring higher reliability. 29Apr96 F rf t e if r to c n a tM ERRI AC /41 Faifel Pl,W estCal el,NJ,07006 / 973o ur h r n o ma in o t c M ri d . dw l 5751300 /FAX 973- 0531 575- |
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