FLEX-1500 Service Manual - V 0.1.pdf

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FlexRadio Systems
FLEX-1500
Software Defined Radio
Service Manual
PRELIMINARY
Author: Graham Haddock, KE9H
Revision 0.1
1
Copyright FlexRadio Systems, 2010
Contents
Introduction …………………………………………...…..
Theory of Operation ……………………………………..
3
4
Alignment, Test and Calibration..…………………….. 11
Troubleshooting and Diagnostics ………………...….. 15
Assembly and Disassembly………………...………….. 16
Appendix “A” Schematic, PTRX (Transceiver) Board
Appendix “B” Schematic, PPA05 (RFPA) Board
Appendix “C” Boards, Top View.
Appendix “D” Test Points and Bus Access.
Appendix “E” Test Fixture.
Appendix “F” Bill of materials.
Revision 0.1
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Copyright FlexRadio Systems, 2010
Introduction
The FLEX-1500™ QRP Software Defined Radio is both an entry level QRP radio and is
also suited to be the ideal IF deck for VHF-Microwave operation. It provides all of the
advantages of a software defined radio, including the sophisticated filters, panoramic
spectrum displays and computer based Graphic interface characteristic of a Software
defined Radio.
This service manual assumes that the reader / service technician is familiar with the
operation of the radio and powerSDR control software. If additional information is
required on those topics, please refer to the Product Manual and Quick Start Guide.
Front View - FLEX-1500
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Copyright FlexRadio Systems, 2010
Theory of Operation
Refer to the Block Diagrams on the two following pages.
The Detailed Schematic is included in Appendix “A.”
The unit is powered by +13.8 Volts DC, supplied via the 2.5 mm x 5.5 mm coaxial power
connector on the rear of the unit. The unit has an internal 3.0 Ampere fuse, that will blow
if the unit draws excessive current, or if the polarity of the power connected to the unit is
reversed.
The FLEX-1500 CPU (TAS1020B Streaming USB Controller) will communicate via
USB for both control and streaming baseband data with the host CPU running the
PowerSDR software. The CPU in the FLEX-1500 has control of all switching, signal
routing, frequency generation via the DDS, FlexWire port, audio amplifier, as well as
audio and baseband routing, CODEC clock generation, data conversion, gain and level
controls for the radio.
Communication between the Flex-1500 radio and the host computer is via a USB
connection capable of USB 1.1 or higher level USB operation. The protocol is USB
“Full Speed” or 12 Megabits per second data transfer rate.
Power Systems and Distribution
The transceiver board requires a source of regulated +5 Volts at approximately 400 mA
to function. +3.3 Volts is supplied to the board in general by a linear +3.3Volt regulator
derived from the +5 Volt line. Additional +3.3 Volt and +1.8 Volts required to operate
some of the integrated circuits is provided by point-of-load regulators in the vicinity of
the IC.
Overall power for the unit is derived from the +13.8 Volt input on the RFPA board.
This 13.8 Volts directly supplies the relays and power amplifier transistors. It is also
feeds two regulators. A 6 Volt regulator is switched on when transmitting, and off when
receiving. This switched +6 Volt output is used to bias the RF power transistors. A
separate +5 Volt regulator supplies power for the SPI decoder and relay driver IC on the
RFPA board, as well as supplies all +5 Volt power to the transceiver board (PTRX) via
the board to board interconnect system.
Revision 0.1
4
Copyright FlexRadio Systems, 2010
Revision 0.1
5
Copyright FlexRadio Systems, 2010

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