The SCR Preselector

High-performance Software Controlled Radio Preselector

TUNABLE BAND-PASS FILTER BANK FOR HF BANDS

Covering 1.8MHz to 30MHz in five bands.

Digital Tuning. Stand alone or USB control from PC.

Now the SCR Preselector frequency setting and band selection is synchronized dynamically with any radio supported by Winrad v1.6.1 and WinradHD.

SCR Preselector on Winrad and WinradHD page

New upgraded features.

Passive Band Pass Filters.
No active switching or amplifying devices in the signal path (Preamplifier Off), therefore itself does not contribute to IMD (Intermodulation Distortion).

■ Tunable Band Pass Filter bank for HF bands.

■ Covering 1.8 to 30 MHz in five selectable bands more preselector By-Pass function.

■ Stand alone or controlled from PC, via USB, through a graphical user interface (GUI). Automatic selection of control mode.

■ Very high IP3 figure. Suitable for Software Define Radios and analogue receivers.

■ Switchable low noise preamplifier. Gain, 25dB, High IP3, 35dB, Noise figure 2.7dB.

■ Exceptional stop-band attenuation centered on the adjacent amateur bands.

■ Removes strong signals radiated back to the antenna from SDR quadrature mixers.

■ Locked to the receiver local oscillator performs tracking tuning function.

■ Can be controlled from an external digital system.

■ PTT feature enables by-pass the preselector in transmission allowing connecting in-line with a 100Watts transceiver.
   (with Dual Antenna by-pass option)

■ Two antenna input.

■ One antenna output. Lets to insert a converter, filter, etc between antenna and SCR Preselector.

■ 0dB, 6dB, 12dB, 18dB input attenuator, selectable.

■ Embedded 110dB stop band, Broadcast Band Rejection filter. (BCB/ Brick Wall filter).

■ Tune coils wound on large toroid cores T-106 size (rated for 100watts RF applications).

■ Digital tuning. Eight bits digital variable capacitor.

■ Porcelain, High Q tuning capacitors.

■ Selectable high IP3, 25 dB gain Low Noise Preamplifier.

■ Dynamic LCD display.

■ Input for external PTT/Keying line signal to by-pass the preselector in transmission mode. 3.5mm plug connector.

■ 12V DC/1Amp. output connector for a 150 Watts dual relay for antenna by-pass . (PTT or Keying line activated.)

■ Full speed USB v2.0 compliant. Plug and Play.

■ The included software runs on PC under Windows 2000, XP, Vista and Windows 7 (32 & 64 bits) OS.
   (Windows 2K users need to update Framework from Windows Update site)

■ Power supply: 12Volts DC/ 0.5Amp max. 3.5mm plug power connector.

■ Dimension: 220mmx165mmx52mm(8.661x6.496x2.047in).

■ Weight: 1.5Kg.

SCR Preselector brochure.

The software program on the PC runs under Windows 2000, XP, Vista32 and Windows 7.
(Windows 2K users need to update Framework from Windows Update site).
The user, through the GUI, commands the SCR Preselector in the same way as it does in stand-alone mode.
The program can work at the same time with any SDR software running on the PC, allowing to the user to control both simultaneously.

Graphic User Interface on PC. PTT activated.

The SCR Preselector is available through