Phase Locked Loop Phase Detector
#phase locked loop
#phase detector
#RF
#frequency synthesis
#signal processing
#communication
#electronics
#circuit design
#PLL
#radio
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Radio Glen Transmit Selector system
The main box of the Transmit Selector system is designed to be located in the technical rack of a small radio broadcast station. There are four stereo balanced line inputs, either of which can be routed to a stereo balanced...
GBPPR 1 GHz RF Spectrum Analyzer
An RF spectrum analyzer is an essential tool for experimenters. The spectrum analyzer project described here is an enhancement of the "Spectrum Analyzer for the Radio Amateur" (Part 2) project by Wes Hayward (W7ZOI) and Terry White (K7TAU), which appeared...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...
Amatorki projekt
The circuit is designed to add two identical branches to the existing despreading spectrum. The only difference between the branches is the phase of the PN sequences fed into each branch, specifically at the input of a double-balanced mixer. The...
Sensitive RF Voltmeter Probe
Sensitive RF Voltmeter Probe Circuit. This circuit measures RF voltages beyond 200 MHz and up to approximately 5V.
The sensitive RF voltmeter probe circuit is designed to accurately measure radio frequency (RF) voltages in the range exceeding 200 MHz, with...
Dave Richards AA7EE
As a follow-up to the previous post, it was discovered that the Sony SRF-59, although inexpensive, offers surprisingly good performance due to its creative receiver architecture. Research was conducted on external antennas to improve reception of weak stations. Among the...
The PLL synthesized oscillator circuit diagram
The PLL synthesizer oscillator circuit is a feedback loop consisting of a reference oscillator, phase comparator, loop filter, voltage-controlled oscillator, programmable frequency divider, and various other components. In this circuit, the reference oscillator employs a crystal oscillator (OSC) to output...
RF Circuitry Links
The 7th overtone of 18 MHz (17m) is 144 MHz (2m) directly within the CW region. Icarus is a high-altitude balloon (HAB) project funded by advertising revenue, which has successfully launched numerous balloons that captured impressive photographs. Robert Harrison is...
Wireless Coupler
Here's a way to get a short range bidirectional RF (Radio Frequency) channel on a microcontroller, using the controller's tristatable I/O pins and on-chip comparator with a few passive components. The range with the firmware and simple I came up...