High-performance Software Controlled Radio Preselector. 1.8MHz to 50MHz tunable Band-Pass Filter bank. Digital tuning.
The SCR Preselector-CAT is suitable to work with SDR or Analogue radios. It is connected in line between the antenna and your receiver or transceiver providing filtering of R.F.spectrum in order to reduce broadband energy and conforming signals before reaching the receiver. Useful in front of strong Near Vertical Incidence Signals (NVIS) propagation situation. In addition it provides rejection of signals from MW AM and VHF FM broadcast bands, removes strong broadband emissions radiated back to the antenna from quadrature mixers and attenuates signals in the VHF region that could mix with the sampling frequency of the analogue to digital data converter in SDR radios.
CAT remote control. Tracking feature
CAT (Computer Aided Transceiver), serial data communication protocol over Virtual Com Port (VCP) enables the SCR preselector-CAT to provide the user with a way to interface with several radios. The SCR Preselector-CAT acts as a passive listener translating valid CAT commands into specific instructions.
Five operating modes:
by means of its own control knobs.
– Graphic User Interface (GUI). Remote console on PC.
– CAT serial protocol over Virtual Com Port (VCP), (Kenwood TS-2000 protocol)
– Over the Internet or Local Network. (TCP/IP protocol).
– I2C bus from an external dedicated controller.
■ Six selectable bands and preselector By-Pass.
■ Five Tuneable Band Pass Filter bank for HF Bands covering 1.8 to 30 MHz plus 50MHz band BPF.
■ All filters are LC passive. No active switching or amplifier devices in the signal path, (LNA Off), therefore it does not contribute to IMD (Intermodulation Distortion).
■ Very high linearity (IP3). Suitable for Software Define Radios and analogue receivers.
■ PTT feature enables connecting in-line with a 100Watts transceiver allowing to by-pass the preselector in transmission.(with Dual By-Pass relay accessory).
■ Two antenna inputs and one antenna output lets insert a converter, filter, etc between the antenna and the Preselector.
■ 0dB, 6dB, 12dB, 18dB input attenuator using MiniCircuits PAT series dedicated attenuation cells.
■ Embedded -110dB stop band Broadcast Band Rejection Filter. (AKA BCB filter, Brick Wall filter, MW band killer filter).
■ Six Band Pass Filters.
■ Tuning coils wound on large toroid cores T-106 size, rated for 100Watts RF applications, avoiding saturation in front of large signals.
■ Band Pass Filters have Notch filters centered on the adjacent amateur bands giving an exceptional stop-band attenuation.
■ Digital tuning. Nine bits variable digital capacitor. One pF resolution. (Variable capacitor emulator).
■ Two embedded 7th order, 60MHz, Elliptic Low Pas Filter for FM broadcast band rejection and sampling frequency attenuation.
■ Switchable low noise amplifier (LNA). 25dB Gain, 38dB IP3, 2.7dB Noise Figure.
■ 12V DC/1Amp DC max. output connector for an external 150 Watts RF rating Input/Output by-pass dual power relay. (PTT or Keying line activated).
■ Power supply: 12Volts DC/ 0.5Amp max. 2.5mm plug power connector.
■ Dimension: 220mm x 165mm x 52mm (8.661 x 6.496 x 2.047in).
■ Weight: 1.5Kg.
■ Full speed USB v2.0 compliant.
■ Plug and Play feature.
■ USB type B connector.
■ ESD protection on USB lines.
■ Optocoupled USB sense signal.
■ Optional USB Galvanic Isolator available.
I2C bus (external controller is needed)
■ I2C bus external lines Galvanically isolated(ADuM1251).
■ 8 bits standard I2C serial bus interface.
■ Supports 100Kbits/s and 400kbits/s FAST I2C Bus protocol.
■ Mini Din connector for I2C control lines.
■ Compatible with most microcontrollers.
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