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Heros tiny SCR Preselector User Manual
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Heros tiny SCR Preselector User Manual

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tiny SCR Preselector. User manual.
Modular 1.8MHz to 30MHz Tunable Band Pass Filter bank.
Software Controlled Radio Preselector via USB v2.0 or I2C Bus
Revision B. September 2009
© Heros Technology Ltd 2006. All rights reserved

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Summary of Contents for Heros tiny SCR Preselector

  • Page 1 SCR Preselector. User manual. Modular 1.8MHz to 30MHz Tunable Band Pass Filter bank. Software Controlled Radio Preselector via USB v2.0 or I2C Bus Revision B. September 2009 © Heros Technology Ltd 2006. All rights reserved...
  • Page 2 ■ Support 100Kbits/s and 400kbits/s FAST I2C Bus protocols. ■ Auxiliary Input/Output ports to implement external controls. ■ Up to eight control modules can share the same I2C Bus. ■ Compatible with most microcontrollers. © Heros Technology Ltd 2006. All rights reserved...
  • Page 3 The tiny SCR Preselector incorporates on antenna input a gas discharge tube as surge suppressor providing safety against static spikes. The five telecom grade relays are connected to its corresponding section of the coil through the Band Selector control on the program software.
  • Page 4 Power supply: 12V DC/250mA max. I2C Bus control module The tiny SCR Preselector I2C Bus control module, located in a separate module board, lets to handle easily the Band pass Filter board from an existing control system on your radio project due the simple implementation of the I2C protocol on any microcontroller.

  • Page 5: Control Module

    SCR PRESELECTOR Manual Why a large toroid core T-200 is used in the tiny SCR Preselector? The reason is to keep a high IP3 or in other words achieve tolerance to large signals. On SDR radios the high linearity of quadrature mixers demands the best linearity possible to the ancillary connected before the mixer stage to avoid to degrading its IP3.
  • Page 6 Windows 2K users need to update Framework from Windows Update site. The user through the Graphic User Interface commands the tiny SCR Preselector. The program can work at the same time with any SDR software running on the PC, without interference allowing to the user to control both simultaneously.
  • Page 7 SCR PRESELECTOR Manual Another Graphic User Interface is included. It incorporates the same functions that the standard GUI. tiny SCR Preselector working with SoftRock Lite + Xtall RX V9_0 © HEROS technology Limited 2006. All rights reserved...

  • Page 8: Driver Installation

    My Documents. Close the program if previously was open. Connect the power supply (12VDC/250mA) and USB cable to the tiny SCR Preselector. A “ Welcome to the Found New Hardware Wizard ” will appear on screen. Mark on “ No, not this time” and click Next...
  • Page 9 SCR PRESELECTOR Manual Mark on “Install from a list or specific..” and click next. Mark on “ Include this location..” and click on Browse button. © HEROS technology Limited 2006. All rights reserved...
  • Page 10 SCR PRESELECTOR Manual Select the file Driver located inside the file copied in your computer and click OK and Next. Installing the USB driver © HEROS technology Limited 2006. All rights reserved...
  • Page 11 SCR PRESELECTOR Manual Click on “Continue Anyway” button The USB driver installation resumes © HEROS technology Limited 2006. All rights reserved...
  • Page 12 SCR PRESELECTOR Manual Installation completed. Driver Installation on Windows Vista OS © HEROS technology Limited 2006. All rights reserved...
  • Page 13 SCR PRESELECTOR Manual Browse for the file “Driver” located inside the file copied in your computer. Select the file “Driver” © HEROS technology Limited 2006. All rights reserved...
  • Page 14 SCR PRESELECTOR Manual Installing the USB driver Click on “Install this driver anyway” © HEROS technology Limited 2006. All rights reserved...
  • Page 15 SCR PRESELECTOR Manual Installation completed. © HEROS technology Limited 2006. All rights reserved...
  • Page 16 Five Band Pass Filters Bank Gas Discharge Tube Multi Band-Pass filter module Drawing tiny SCR Preselector_Rev_B Diagram Approvals Size DWG No Issued Sheet Checked Scale FCSM No Drawn JJ de Oñate Date XV VIII MMVIII © HEROS technology Limited 2006. All rights reserved...
  • Page 17 SCR PRESELECTOR Manual In the following plot a Broadcast Band rejection filter has been connected to the input of the tiny SCR Preselector in order to remove interferences from MW stations. (N2PK Vector Network Analyzer & My VNA program software)
  • Page 18 SCR PRESELECTOR Manual Band A plot (N2PK Vector Network Analyzer & My VNA program software) © HEROS technology Limited 2006. All rights reserved...
  • Page 19 SCR PRESELECTOR Manual Band B (N2PK Vector Network Analyzer & My VNA program software) © HEROS technology Limited 2006. All rights reserved...
  • Page 20 SCR PRESELECTOR Manual Band C (N2PK Vector Network Analyzer & My VNA program software) © HEROS technology Limited 2006. All rights reserved...
  • Page 21 SCR PRESELECTOR Manual Band D (N2PK Vector Network Analyzer & My VNA program software) © HEROS technology Limited 2006. All rights reserved...
  • Page 22 SCR PRESELECTOR Manual Band E (N2PK Vector Network Analyzer & My VNA program software) © HEROS technology Limited 2006. All rights reserved...
  • Page 23 Heros technology Limited makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose.