radio galaxy dx88h
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An Instruction and Reference Book on Radio and Television, Coyne Electrical and Television-Radio School, 1951
This publication serves as a comprehensive instructional and reference guide focused on the principles and practices of radio and television technology as taught by the Coyne...
Circuit diagramms of the 144 SBB/RX - Receiver
To comprehend the interconnections between the following circuits, it is essential to first review the concept chapter. It is at the discretion of the user to select one or two of these circuits for personal development. The discussion begins with...
915-MHz antenna monopole
The Tab antenna is a folded monopole that you miniaturize by forming it into an inverted L with a downward bend at the end. You can solder it perpendicular to a pc board or build it as part of a...
Wideband RF Field Strength Meter
A field strength meter is highly beneficial when dealing with RF devices. It allows for the rapid diagnosis of transmitter circuit functionality and can detect RF signals present in the environment. The simplest form of a field strength meter can...
Broadcast circuits
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3-Wire Receiver/Message Demuxer
This 3-wire receiver verifies the initial four data bits of 16 received bits against a predetermined address. If the two match, the remaining 12 bits are stored in two 6-bit flip-flop registers. The design can utilize either CMOS or TTL...
RF Inductance Meter
This RF inductance meter measures RF chokes in the 500 nH to 50 µH range. A simple solution was required to measure hand-wound RF inductors in a secondary lab setting. The user intended to utilize this device occasionally and did...
Reflex Radio Receiver
The RF signal is transmitted from the antenna through CI to a tuned circuit consisting of LI and C2. One end of L2 delivers the RF signal to the base of Q1 for amplification, while the other end connects to...
Simple RF Transmitter
This schematic represents a tone transmitter. When using sufficiently small resistor values, it generates a tone. A resistive microphone (such as a carbon microphone) can be placed in parallel with or replace the resistor, allowing modulation of the tone frequency...