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DEM Part Number MICROLO and MICROLOK
Microwave Transverter Local Oscillator
Theory and Operation:
The LO is intended to be used as part of an DEMI’s line of
microwave transverters. It may also be used as a stand alone oscillator. The
following table provides crystal information and multiplication factors for
DEMI microwave transverters and converters using a 144 MHz IF and low
side injection. These are the standard “Weak Signal” frequency’s
configurations. Other frequency’s may be used within the ranges given for
other microwave transverters or converter schemes.
Band Crystal
Frequency
2304 180.000 MHz. 1080.000 MHz. +3dBm X2 2160.000 MHz.
2400 188.000 MHz. 1128.000 MHz. +3dBm X2 2256.000 MHz.
3456 184.000 MHz. 1104.000 MHz. +3dBm X3 3312.000 MHz.
5760 187.200 MHz. 1123.200 MHz. +3dBm X5 5616.000 MHz.
10368 189.333 MHz. 1136.000 MHz. +3dBm X9 10224.000MHz.
LO Output Frequency
and Output Power
Multiplication Xverter LO
Frequency
The MICRO-LO needs a regulated 9 volt DC supply for correct operation. This insures stability during
mobile operation. Other operating voltages are possible if the MMIC amplifiers are re-biased. Frequency drift
is curtailed by a positive temperature coefficient Thermistor mounted to the crystal. Current drain is 300 mA
maximum at cold start up. Frequency adjustment is accomplished with a multi-turn piston capacitor on the
back of the board. A test point is located there for tune-up. Mounting holes and a large ground plane offer
easy installation in any enclosure.
MICROLOK-PC Board Parts Kit
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