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Ll, Ql, L2, and L3 form an RF amplifier stage that feeds Ml, a doubly balanced mixer. Q4 is a local oscillator stage operating in the 375-MHz range. Signals in the 420- to 450-MHz range from Ql are mixed...
An EEPROM is a type of non-volatile memory, which means it is used for permanently storing digital data without any power supply. EEPROM stands for Electrically Erasable Programmable Read-Only Memory. The advantage of this type of ROM is that...
This article provides an overview of the R100 and MCR100 UHF repeaters. All information was obtained from a physical examination of the station, the programming software, and the R100 Instruction (and service) Manual, p/n 6881078E15, as well as the...
The NES version of this modification closely resembles the SNES version, and it is advisable to review that article first for a general understanding of the assembly of these controllers. The primary component required is an original NES controller,...
A model RTX-70 exciter was originally utilized in the Brookdale ATV Repeater System. This document outlines the design considerations and new features of this exciter, including schematics of the circuits developed during its creation. The ATV exciter described employs...
This document serves as a continuation of the previous work on PWM controllers utilizing 555 timers. The new design incorporates microcontrollers and MOSFETs in place of the 555 integrated circuits and transistors. Two versions have been developed: one equipped...
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