Downed Model Locator
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Grounded Grid Amplifiers
Floating the grid above ground is detrimental for RF performance and arc protection. The connection of the control grid to ground is critical for stability. It is essential to keep the grid connection to ground as wide and short as...
RF circuits
A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a few...
RF-powered sidetone oscillator
A sidetone oscillator is a specific type of audio astable multivibrator. Keying is achieved by turning the oscillator on and off through the application of a positive DC potential, which is generated from the RF signal to the reset terminal...
Radio Field Indicator Circuit
An RF field indicator is needed to verify power stages and transmitter antennas. This radio field indicator allows for the measurement of radiated energy from antennas.
An RF field indicator is a crucial device in the field of telecommunications and broadcasting....
Intelligent home lighting control switch transmitter and receiver circuit
This design aims to create a long-distance wireless remote control switch lighting control system, which consists of a transmission system and a reception system. The system utilizes wireless transceiver modules for RF transmission and reception. The transmitting portion mainly comprises...
4-18Mhz-converter
The unit consists of an RF amplifier Q1, a local oscillator Q2, and a mixer Q3. The two frequency bands are covered without a band switch by utilizing an intermediate frequency (IF) of 3.5 MHz. The oscillator operates within a...
Beeper Circuit
This box is a portable transfer standard to maintain and carry with you a local time signal of 59 short beeps (pips) plus a long 0.4 sec beeeeep on the full minute. At the start of the job, the box...
GPS Jammer
A low-cost device to temporarily disable the reception of the civilian coarse acquisition (C/A) code used for the standard positioning service (SPS) on the Global Positioning System (GPS/NAVSTAR) L1 frequency of 1575.42 MHz. This is accomplished by transmitting a narrowband...
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...