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BH1RBG RF Lab
Ham Radio
Antenna: Your first Antenna
HF: 0.5W Linear push pull PA
10M:28.6Mhz FM transmiter
27Mhz: AM RX/TX Experiment
AM: AM band transmiter by Techlib
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Build Reciver
DC: Polyakov (III) Audio Again
DC: Polyakov (II) Improvise
DC: Polyakov (I)
Build Receivers
FM Synchrodyne
FM Synchrodyne II
Rflex: with voltage doubler detector
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
SuperRegen: AirCraft band receiver
Super Regen: Make it work
Regen III: A Journey of BJT Regen
Regen II: High Performance Rig
Regen I: Amazing Regen Receiver
TRF IV: Stabilize RF Amplifier
TRF III: Long Wire
TRF II: infinity 0V2
TRF I: Origin of Receiver
Crystal Set Season (III)
Start From Crystal (II)
Crystal Radio (I)
Experiment
Audio Experiment
Audio: Simple power amplifier
Audio Preamplifier
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio: wein sine bridge
Audio: Push Pull PA
Oscillators
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
VFO: hybrid feedback oscillator
VFO: AM band Oscillator
VFO: ultra-audion LF to VHF
VCO: Vackar 30Mhz-240Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Seiler 80Mhz-300Mhz
VCO: Negative VCO Linearity
VCO: Negative resistance VCO
VCO: linearity factor
VCO: Improved Series E VCO
VCO: CB colpitts 270Mhz-500Mhz
VCO: AM Hartley LO
VCO: Franklin 80Mhz-180Mhz
VFO Series-E oscillator
Miller negative resistance Oscillator
Fail: CB Negistor-not work
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
Several Dipper Oscillators
Instrument
Attenuator: 50ohm/81dB 1dB step
Attenuator: 600ohm 1dB Step
Attenuator: Serebriakova 13-40dB
Audio: low THD two tone generator
A Simple ESR Meter
SWR: the Good HF QRP SWR
Bridge: RLB VHF
Power Meter: AD8307
Power Meter: Calibrator
Thermistor RF Power Meter
Log Sweeper (I)
Log Sweeper (II)
Log Sweeper (III)
Ramp generator (I)
Ramp generator (II)
Manual sweeper source
Sweeper source (I)
SA: What is SA (SA demo prj)
PC Oscope/SA
Crystal Checker
JFET Bias tool box
Bias: favorite BJT/JFET bias guide
LiPo Balance charger
LiPo: Simple charger
NICD Discharger
Servo constant current load
Supply: dual Li-Po 7.2V-8.2V
Deep RF
Antenna: Helical Ant and L-match
Antenna: before make receiver
Audio PA
IF.455K: Design and Improvement
IF.455K: Gain Vs Stable
IF.455K:OLD MW Radio BJT IF
IF.455K:why tap stabilize the IF Amp
DBM In The Frequency generator
PA: 27Mhz FM TX Chain Design
PA: Exploring PA
PA: TX chain PA to Antenna
Misread CB Amplifier
Run into Wide-Band Buffer/Amplifiers
Noise Figure Mess
Core: evaluate unknown core
RF choke: dig SRF
RF Practice: better to know
Laboratory
Osciloscope
Tektronix 465B B sweep Fix
Tektronix 4xx Power Supply
Tek CRT DC Restorer Circuits
Fix Another Tek 465
Restoration One 465B
Tek 485 Hi-z Attenuator
Tek 475 Restoration
Restoration Tek 485
Tek465B Restroration
Fix One Rear Tek-465
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
Restoration An Tektronix 464
VTVM
HP 400H – 6-Month Checkup
HP410B and RF Probe
Power Meter
Boonton 92B
Fixing GH2462 Directional Power meter
Signals
HP8640B -20V Power Supply Down
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Restoraion a HP200CD Oscillator
A Brand new LCR HP4263B
Tektronix 495P Fix and Alignment
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Memory U019 Frequency Selective Volmeter
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
微积分桥
Get to Know An Old VGA Card
Frequency Counter
BH1RBG RF Lab
Ham Radio
Antenna: Your first Antenna
HF: 0.5W Linear push pull PA
10M:28.6Mhz FM transmiter
27Mhz: AM RX/TX Experiment
AM: AM band transmiter by Techlib
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Build Reciver
DC: Polyakov (III) Audio Again
DC: Polyakov (II) Improvise
DC: Polyakov (I)
Build Receivers
FM Synchrodyne
FM Synchrodyne II
Rflex: with voltage doubler detector
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
SuperRegen: AirCraft band receiver
Super Regen: Make it work
Regen III: A Journey of BJT Regen
Regen II: High Performance Rig
Regen I: Amazing Regen Receiver
TRF IV: Stabilize RF Amplifier
TRF III: Long Wire
TRF II: infinity 0V2
TRF I: Origin of Receiver
Crystal Set Season (III)
Start From Crystal (II)
Crystal Radio (I)
Experiment
Audio Experiment
Audio: Simple power amplifier
Audio Preamplifier
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio: wein sine bridge
Audio: Push Pull PA
Oscillators
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
VFO: hybrid feedback oscillator
VFO: AM band Oscillator
VFO: ultra-audion LF to VHF
VCO: Vackar 30Mhz-240Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Seiler 80Mhz-300Mhz
VCO: Negative VCO Linearity
VCO: Negative resistance VCO
VCO: linearity factor
VCO: Improved Series E VCO
VCO: CB colpitts 270Mhz-500Mhz
VCO: AM Hartley LO
VCO: Franklin 80Mhz-180Mhz
VFO Series-E oscillator
Miller negative resistance Oscillator
Fail: CB Negistor-not work
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
Several Dipper Oscillators
Instrument
Attenuator: 50ohm/81dB 1dB step
Attenuator: 600ohm 1dB Step
Attenuator: Serebriakova 13-40dB
Audio: low THD two tone generator
A Simple ESR Meter
SWR: the Good HF QRP SWR
Bridge: RLB VHF
Power Meter: AD8307
Power Meter: Calibrator
Thermistor RF Power Meter
Log Sweeper (I)
Log Sweeper (II)
Log Sweeper (III)
Ramp generator (I)
Ramp generator (II)
Manual sweeper source
Sweeper source (I)
SA: What is SA (SA demo prj)
PC Oscope/SA
Crystal Checker
JFET Bias tool box
Bias: favorite BJT/JFET bias guide
LiPo Balance charger
LiPo: Simple charger
NICD Discharger
Servo constant current load
Supply: dual Li-Po 7.2V-8.2V
Deep RF
Antenna: Helical Ant and L-match
Antenna: before make receiver
Audio PA
IF.455K: Design and Improvement
IF.455K: Gain Vs Stable
IF.455K:OLD MW Radio BJT IF
IF.455K:why tap stabilize the IF Amp
DBM In The Frequency generator
PA: 27Mhz FM TX Chain Design
PA: Exploring PA
PA: TX chain PA to Antenna
Misread CB Amplifier
Run into Wide-Band Buffer/Amplifiers
Noise Figure Mess
Core: evaluate unknown core
RF choke: dig SRF
RF Practice: better to know
Laboratory
Osciloscope
Tektronix 465B B sweep Fix
Tektronix 4xx Power Supply
Tek CRT DC Restorer Circuits
Fix Another Tek 465
Restoration One 465B
Tek 485 Hi-z Attenuator
Tek 475 Restoration
Restoration Tek 485
Tek465B Restroration
Fix One Rear Tek-465
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
Restoration An Tektronix 464
VTVM
HP 400H – 6-Month Checkup
HP410B and RF Probe
Power Meter
Boonton 92B
Fixing GH2462 Directional Power meter
Signals
HP8640B -20V Power Supply Down
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Restoraion a HP200CD Oscillator
A Brand new LCR HP4263B
Tektronix 495P Fix and Alignment
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Memory U019 Frequency Selective Volmeter
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
微积分桥
Get to Know An Old VGA Card
Frequency Counter
More
Ham Radio
Antenna: Your first Antenna
HF: 0.5W Linear push pull PA
10M:28.6Mhz FM transmiter
27Mhz: AM RX/TX Experiment
AM: AM band transmiter by Techlib
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Build Reciver
DC: Polyakov (III) Audio Again
DC: Polyakov (II) Improvise
DC: Polyakov (I)
Build Receivers
FM Synchrodyne
FM Synchrodyne II
Rflex: with voltage doubler detector
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
SuperRegen: AirCraft band receiver
Super Regen: Make it work
Regen III: A Journey of BJT Regen
Regen II: High Performance Rig
Regen I: Amazing Regen Receiver
TRF IV: Stabilize RF Amplifier
TRF III: Long Wire
TRF II: infinity 0V2
TRF I: Origin of Receiver
Crystal Set Season (III)
Start From Crystal (II)
Crystal Radio (I)
Experiment
Audio Experiment
Audio: Simple power amplifier
Audio Preamplifier
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio: wein sine bridge
Audio: Push Pull PA
Oscillators
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
VFO: hybrid feedback oscillator
VFO: AM band Oscillator
VFO: ultra-audion LF to VHF
VCO: Vackar 30Mhz-240Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Seiler 80Mhz-300Mhz
VCO: Negative VCO Linearity
VCO: Negative resistance VCO
VCO: linearity factor
VCO: Improved Series E VCO
VCO: CB colpitts 270Mhz-500Mhz
VCO: AM Hartley LO
VCO: Franklin 80Mhz-180Mhz
VFO Series-E oscillator
Miller negative resistance Oscillator
Fail: CB Negistor-not work
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
Several Dipper Oscillators
Instrument
Attenuator: 50ohm/81dB 1dB step
Attenuator: 600ohm 1dB Step
Attenuator: Serebriakova 13-40dB
Audio: low THD two tone generator
A Simple ESR Meter
SWR: the Good HF QRP SWR
Bridge: RLB VHF
Power Meter: AD8307
Power Meter: Calibrator
Thermistor RF Power Meter
Log Sweeper (I)
Log Sweeper (II)
Log Sweeper (III)
Ramp generator (I)
Ramp generator (II)
Manual sweeper source
Sweeper source (I)
SA: What is SA (SA demo prj)
PC Oscope/SA
Crystal Checker
JFET Bias tool box
Bias: favorite BJT/JFET bias guide
LiPo Balance charger
LiPo: Simple charger
NICD Discharger
Servo constant current load
Supply: dual Li-Po 7.2V-8.2V
Deep RF
Antenna: Helical Ant and L-match
Antenna: before make receiver
Audio PA
IF.455K: Design and Improvement
IF.455K: Gain Vs Stable
IF.455K:OLD MW Radio BJT IF
IF.455K:why tap stabilize the IF Amp
DBM In The Frequency generator
PA: 27Mhz FM TX Chain Design
PA: Exploring PA
PA: TX chain PA to Antenna
Misread CB Amplifier
Run into Wide-Band Buffer/Amplifiers
Noise Figure Mess
Core: evaluate unknown core
RF choke: dig SRF
RF Practice: better to know
Laboratory
Osciloscope
Tektronix 465B B sweep Fix
Tektronix 4xx Power Supply
Tek CRT DC Restorer Circuits
Fix Another Tek 465
Restoration One 465B
Tek 485 Hi-z Attenuator
Tek 475 Restoration
Restoration Tek 485
Tek465B Restroration
Fix One Rear Tek-465
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
Restoration An Tektronix 464
VTVM
HP 400H – 6-Month Checkup
HP410B and RF Probe
Power Meter
Boonton 92B
Fixing GH2462 Directional Power meter
Signals
HP8640B -20V Power Supply Down
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Restoraion a HP200CD Oscillator
A Brand new LCR HP4263B
Tektronix 495P Fix and Alignment
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Memory U019 Frequency Selective Volmeter
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
微积分桥
Get to Know An Old VGA Card
Frequency Counter
Build Reciver
DC: Polyakov (I)
DC: Polyakov (II) Improvise
DC: Polyakov (III) Audio Again
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