Kth - sdr - kit

6/13/2010 KTH - SDR - KIT Page 5
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Si570 output frequency. There is no IF correction because of different IF frequencies applied in the various
SDR software.
The PIC microcontroller generates the I2C signals for controlling the modules. These signals are transferred
via the motherboard en CON4 and CON9 connectors. Frequency control is performed by reading the 24ppr
encoder or by commands via the USB port.
Several ports of the microcontroller are used to read the push buttons on the front panel and for switching the
HF, VHF and UHF band filters and power supply for these modules.
Keypad use via I2C is optional and not yet implemented.
1.6 LCD moduul.
The LCD module PCB is mounted behind the front panel and on this PCB the LCD module and the function
push buttons are mounted. Next to the push buttons, pull-up resistors are installed. They are useful when the
R17 resistor array is not used.
The I2C address of the LCD module is set by 3 jumpers, J1=0, J2=0 and J3=1.
1.7 Motherboard module.
The Motherboard module consists of an EURO card size board which fits precisely into the enclosure.
Access to the USB and RCA connectors is via the front- and rear panel.
The modules fit in the 30-pole card-edge connectors on the motherboard to prevent separate wiring. The
LCD- and Attenuator module and also the encoder is connected to the motherboard by flat cable.
It is up to the user which filter module (HF and/or VHF-UHF) should be used. It is also possible to design a
filter (or other) module for a specific application to make this SDR kit very flexible.
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Instruction manual KH-SDR wideband receiver Kit No-1021. All rights reserved KTH-SDR-KIT. Software design by PA0RWE.