RF Test Circuits

• Capacitance Meter
• Field Strength Meter LM324
• HF Q-meter VK5JST
• Antenna Analyzer - F6BQU
• RF Power Calibrator
• VHF Wattmeter
• 88 MHz - 960 MHz Antenna Analyzer
• LED RF Power Meter - N9ZIA
• Return Loss Bridge
• Return Loss Bridge with AD8307
• HF SWR Bridge
• Grid Dip Meter 2 MHz - 20 MHz
• Field Strength Meter 3 Levels
• BandScope for 2m Band
• Lightening Detector
• 3-Digits Dip Meter
• Calibrated Noise Source
• Capacitance Meter using DVM
• Inductance Meter using DVM
• High-Impedance RF Probe
• DC to 500 MHz Log Detector/Amplifier - DJ1ES
• L-C-R Bridge - G3BIK
• Phase Meter
• Inductance Meter - VK5BR
• L/C Meter - IZ7ATH
• FM Deviation Meter
• Flicker-Noise Generator - Wenzel
• 2.4 GHz mW Power Meter - F1HDD
• Simple Crystal Tester - F5JTZ
• Inductance Meter - N5ESE
• Magnetic Field Meter
• RF dBu Meter
• Two chips LED Frequency Counter - PA2OHH
• 0-99 kHz Frequency Counter - G0UPL
• LED SWR/Power meter - PY2MG  
• Electro-Magnetic Waves Detector
• Long-Wave Lightening Detector
• Cable Reflection Tester - N9ZIA
• TDR Circuit and Signals - T.Engdhal
• 1 MHz to 1 GHz LED Absorption Meter - GW1TDV
• S9 HF Signal Generator
• Antenna Noise Bridge
• Audio Filter Analyzer
• True Linear RF Power Detector
• Grid Dip Meter 3.5 MHz to 110 MHz
• 1.6 MHz to 150 MHz Modulated Grid-Dip Meter
• Five Grid-Dip Meters
• 30 kHz to 30 MHz Sinusoidal Signal Generator
• Capacimeter using NE555
• 0-1uF Capacimeter
• Coil Short-Circuit Detector
• Fonometer
• All-BJTs L-C Meter
• VHF FM Signal Generator
• Sweeper for 455 kHz IF
• 500 kHz to 3 GHz LED Field-Strength Meter
• 2xBJT Capacimeter
• Varactor Capacimeter
• Automatic VSWR and Power Meter - W0INK
• RF Sweeper - VK2ZAY
• Very Low Frequency Survey Probe - VK2ZAY
• 1 MHz to 30 MHz Noise Source - G1HSM
• Capacimeter with 2xNE555 - WA8MCQ
• Dual-LED SWR Indicator for QRP
• HF In-Line Return Loss and Power Meter - N2PK
• SWR Bridge Tuner "Rainbow" - N2CX
• Spectrum Analyzer on the Oscilloscope
• Grid-Dip Meter with Digital Display
• Marker Generator - KB1MW
• Micro-Wattmeter - W7DB