H A R D W A R E C O N F I G U R A T I O N C H A P T E R 3
Upgrades
2 Meter Transverter
The DEM 144-28FRSK is a low power, high performance 144 MHz to 28 MHz transverter kit design to be
used in conjunction with Flex Radio System’s SDR-1000 Software Defined Radio transceiver. It is intended
to be used as a 2nd conversion IF for microwave transverters. The 144-28FRSK has a nominal linear output
power of 50 - 100 mW with the 28 MHz. IF drive provided by the SDR-1000. On the receive side, a high
dynamic range amplifier, a high level double balanced mixer (+17.0 dBm) and a three chamber helical filter
are employed to providing a over load proof, unity gain front end with superior selectivity. It is the same
design as our high performance 2 meter transverter but without the GaAs FET front end that would provide
excessive system gain not require in a microwave transverter system. The transverter is complete with all
interfacing required to install in the SDR1K-ENC enclosure and operate with the SDR-1000.
The 144-28FRSK’s 144 MHz input/output utilize BNC connectors (supplied in this kit) that are mounted in
the existing holes in the SDR1K-ENC enclosure. The transverter also has a built in relay for external
switching duties if required. It will “Shadow” the TR switch timing of the SDR-1000. The only external
wiring required to operate a microwave transverter after the completion of this kit are a simple BNC cable
or cables that will carry both TX and RX signals along with the keying voltage to activate the microwave
transverters of choice transmit functions. It is a complete, simple to use kit and will provide the highest 2
meter to microwave transverter performance on the market today.
100W Power Amplifier
The SDR-100WPA is a 100 Watt HF linear power amplifier, designed exclusively for installation in SDR-
1000 Software Defined Transceivers. Adding the 100WPA to existing radios required limited kit building
skills including wire/coax preparation, connector assembly, soldering, and mechanical assembly.
Specifications
Power output: 100W PEP, 50W on 60m
Bands: 160, 80, 60, 40, 30, 20, 17, 15, 12, 10 meters
Elliptical filters on all bands
Drive requirements: <500mW for full output
Output transistors: Rugged matched pair 2SC2879s
Duty cycle: Designed for intermittent SSB service (40W continuous duty)
Harmonic Content: < -43dBc
Load tolerance: 2:1 SWR or better
5 FlexRadio Systems
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