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DIGITAL FILTERS

Preselector PS-UHF

(digital tunable RF filter)

This frequency Hopping Module is a digitally tunable filter operating from 225 MHz to 450 MHz. This module is a Pre-selector that is made up of three internal tunable filters to provide the broad frequency coverage, the internal switching network switches between three filter bands and the internal amplifier is included to reduce the insertion losses resulting from the tunable filters. The tunable filters provide improved pass band performance.

Technical specification:

Frequency Coverage: 225 MHz to 450 MHz
Input/Output Impedance: 50 W; VSWR < 2:1
-3dB Bandwidth: (2.0 ± 0.5) %
In-band Third Order Intercept Point: > +50 dBm (input)
In-band Second Order Intercept Point: > +100 dBm (input)
Tuning Control: 8 bit parallel
Tuning time: < 50 µsec
RF Power Handling Capability:

- in band, at ±0.5% of tune frequency: 5W CW

- stop-band, at ±10% or greater of tune frequency: 20 W CW

Center Frequency Drift: 80 PPM/°C
IN band loss: < -10 dB

10% adjustment frequency off-tuning: > 45 dB

5% adjustment frequency off-tuning: > 26 dB

20% adjustment frequency off-tuning : 55 dB

DC Power: +5 VDC @ 500 mA
Operating Temperature Range: -40 to + 65°C
Dimensions: 140 x 107 x 60 mm

Pre/postselector РPS-HF

(digital tunable RF filter)

Prepostselector РPS-HF is designed to increase the noiseproof feature of the radio receiver device at the frequency range 1,5…30 MHz and has input and output resistance 50 Оhm at VSWR < 2.

Two-circuit three-range filter makes selection at the frequency. Reorganization into each range made two-circuit discontinuous capacitor. Constructionally differs from the preselector PS-UHF by the availability of the block amplifier. And so can it be used in both - the radio receiver and the radio transmission device.

Technical characteristics: