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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
DC: Polyakov (I)
DC: Polyakov (II) Improvise
DC: Polyakov (III) Audio Again
FM Synchrodyne
FM Synchrodyne II
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
Rflex: with voltage doubler detector
Regen I: Amazing Regen Receiver
Regen II: High Performance Rig
Regen III: A Journey of BJT Regen
SuperRegen: AirCraft band receiver
Super Regen: Make it work
TRF I: Origin of Receiver
TRF II: infinity 0V2
TRF III: Long Wire
TRF IV: Stabilize RF Amplifier
Crystal Radio (I)
Start From Crystal (II)
Crystal Set Season (III)
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Experiment
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio Preamplifier
Audio: Simple power amplifier
Audio: wein sine bridge
Audio: Push Pull PA
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
Fail: CB Negistor-not work
Miller negative resistance Oscillator
Several Dipper Oscillators
VFO Series-E oscillator
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
VCO: Franklin 80Mhz-180Mhz
VCO: AM Hartley LO
VCO: CB colpitts 270Mhz-500Mhz
VCO: Improved Series E VCO
VCO: linearity factor
VCO: Negative resistance VCO
VCO: Negative VCO Linearity
VCO: Seiler 80Mhz-300Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Vackar 30Mhz-240Mhz
VFO: ultra-audion LF to VHF
VFO: AM band Oscillator
VFO: hybrid feedback oscillator
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
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
HP 400H – 6-Month Checkup
HP410B and RF Probe
Fixing GH2462 Directional Power meter
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
A Brand new LCR HP4263B
Fix One Rear Tek-465
Restoraion a HP200CD Oscillator
Tek465B Restroration
Restoration Tek 485
Tek 475 Restoration
Tektronix 495P Fix and Alignment
HP8640B -20V Power Supply Down
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Restoration One 465B
Fix Another Tek 465
Restoration An Tektronix 464
Tek 485 Hi-z Attenuator
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Tek CRT DC Restorer Circuits
Tektronix 4xx Power Supply
Memory U019 Frequency Selective Volmeter
Boonton 92B
Tektronix 465B B sweep Fix
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
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
DC: Polyakov (I)
DC: Polyakov (II) Improvise
DC: Polyakov (III) Audio Again
FM Synchrodyne
FM Synchrodyne II
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
Rflex: with voltage doubler detector
Regen I: Amazing Regen Receiver
Regen II: High Performance Rig
Regen III: A Journey of BJT Regen
SuperRegen: AirCraft band receiver
Super Regen: Make it work
TRF I: Origin of Receiver
TRF II: infinity 0V2
TRF III: Long Wire
TRF IV: Stabilize RF Amplifier
Crystal Radio (I)
Start From Crystal (II)
Crystal Set Season (III)
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Experiment
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio Preamplifier
Audio: Simple power amplifier
Audio: wein sine bridge
Audio: Push Pull PA
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
Fail: CB Negistor-not work
Miller negative resistance Oscillator
Several Dipper Oscillators
VFO Series-E oscillator
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
VCO: Franklin 80Mhz-180Mhz
VCO: AM Hartley LO
VCO: CB colpitts 270Mhz-500Mhz
VCO: Improved Series E VCO
VCO: linearity factor
VCO: Negative resistance VCO
VCO: Negative VCO Linearity
VCO: Seiler 80Mhz-300Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Vackar 30Mhz-240Mhz
VFO: ultra-audion LF to VHF
VFO: AM band Oscillator
VFO: hybrid feedback oscillator
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
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
HP 400H – 6-Month Checkup
HP410B and RF Probe
Fixing GH2462 Directional Power meter
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
A Brand new LCR HP4263B
Fix One Rear Tek-465
Restoraion a HP200CD Oscillator
Tek465B Restroration
Restoration Tek 485
Tek 475 Restoration
Tektronix 495P Fix and Alignment
HP8640B -20V Power Supply Down
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Restoration One 465B
Fix Another Tek 465
Restoration An Tektronix 464
Tek 485 Hi-z Attenuator
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Tek CRT DC Restorer Circuits
Tektronix 4xx Power Supply
Memory U019 Frequency Selective Volmeter
Boonton 92B
Tektronix 465B B sweep Fix
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
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
DC: Polyakov (I)
DC: Polyakov (II) Improvise
DC: Polyakov (III) Audio Again
FM Synchrodyne
FM Synchrodyne II
Heterodyne: BJT AM receiver
Heterodyne: Build A Traditional Radio
Rflex: with voltage doubler detector
Regen I: Amazing Regen Receiver
Regen II: High Performance Rig
Regen III: A Journey of BJT Regen
SuperRegen: AirCraft band receiver
Super Regen: Make it work
TRF I: Origin of Receiver
TRF II: infinity 0V2
TRF III: Long Wire
TRF IV: Stabilize RF Amplifier
Crystal Radio (I)
Start From Crystal (II)
Crystal Set Season (III)
DYNALEC Earphone Repair
Make A Crystal Headphone
Broken a YYT T668 Talkie
Transistors Collections
Microphones Collection
Delta Hamfest
Experiment
Audio: 2 stages Transformer Audio PA
Audio: Discrete Power Amplifer
Audio: low distortion wein bridge
Audio Preamplifier
Audio: Simple power amplifier
Audio: wein sine bridge
Audio: Push Pull PA
Green Bobin Filter
Mixer: JFET active mixer
IF: BJT 2 Stage with AGC
AMP: Simple RF Amplifier
Antenna: JFET active antenna
CXO: CXO/overtone for TX
CXO: Low distortion oscillator
CXO: Tune 5th Butler Overtone VHF Oscillator
Fail: CB Negistor-not work
Miller negative resistance Oscillator
Several Dipper Oscillators
VFO Series-E oscillator
Oscillator amplitude stabilization
Ramp: Versatile ramp generator
Sweep: Build new topology signal source
Sweep: simple Hartley Sweeper
VCO: Franklin 80Mhz-180Mhz
VCO: AM Hartley LO
VCO: CB colpitts 270Mhz-500Mhz
VCO: Improved Series E VCO
VCO: linearity factor
VCO: Negative resistance VCO
VCO: Negative VCO Linearity
VCO: Seiler 80Mhz-300Mhz
VCO: Ultra Negtive 100kHz-100Mhz
VCO: Vackar 30Mhz-240Mhz
VFO: ultra-audion LF to VHF
VFO: AM band Oscillator
VFO: hybrid feedback oscillator
Air Coil 4.5 Turns example
experimental board
Fuse based dead bug
Prototype Board by Banana plug
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
HP 400H – 6-Month Checkup
HP410B and RF Probe
Fixing GH2462 Directional Power meter
Tek465 Auto Mode Analysis
Restoration Tektronix 5111
A Brand new LCR HP4263B
Fix One Rear Tek-465
Restoraion a HP200CD Oscillator
Tek465B Restroration
Restoration Tek 485
Tek 475 Restoration
Tektronix 495P Fix and Alignment
HP8640B -20V Power Supply Down
Restoration HP8662A
HP 8565 Spectrum Analyzer Repair
DH1718 Power Supply
Repair the HP8558 SA
Restoration One 465B
Fix Another Tek 465
Restoration An Tektronix 464
Tek 485 Hi-z Attenuator
HP3312 Restoration
Restoration of HP-21 alike Cavity Oscillators
Tek CRT DC Restorer Circuits
Tektronix 4xx Power Supply
Memory U019 Frequency Selective Volmeter
Boonton 92B
Tektronix 465B B sweep Fix
Fix:under extrusion:long move or retraction
OpenRC truggy Improvement
3D printer make RF fun and cool
Heterodyne tracking calculator
IF Cans
Digital&Logic
Get to Know An Old VGA Card
Frequency Counter
HP410B and RF Probe
2025/6/8 S.P.A.R.C sale
UNDER CONSTRUCTON
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