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Radio Ham Technology : by Alastair GW0AJU
Home
10Watt Two Metre Run
Audio Tone Controls
Lumped Coil Yagi HF antenna
Microphone headphones
Simultaneous Tri-band ham radio set
Stable op-amp amplifier circuits
Visual Basic antenna design code
bitx40 with signal meter
HF power “S” meter readings
SSB power
solution to overcome the "app.publish" folder in vb.net
BHI HP-1 headphones
cb 27/81 limits
Choosing you power supply unit for your radio
"ATU" design ideas and "SWR " measurement principles
10m to 70cm mobile antenna
49er active bridge
49er active bridge v2.0
49er active bridge v3
49er digital vfo
9:1 balam feed long wire antenna
A bench test "RF on air noise floor measurement"
A.F. spectrum bar graph display
AC and DC gain of amplifier circuits
active bridge v4
All HF Touch Screen Digital vfo
Antenna Suspects
Arduino QRP Beacon
Audio data FSK encode / decode
Audio Signal Processing
Bitx40 signal propagation
bitx40 tone beep ptt
coax hidden antenna load
Comparing a S9 signal at HF to S9 at VHF or UHF
Cross position load coil antenna for HF band plan
Digital BFO for tri-band radio software
digital vfo code for 15m, 12m, 10m band
digital vfo code for 160m, 80m, 40m band
digital vfo code for 30m, 20m, 17m band
digital vfo code for LF, 600m, 60m band
Direct RF sampling "SDR radio"
Discussion of Radio Frequency Mixers
Dual mode active bridge
emf distance
General purpose active SWR meter
general purpose CW SSB BFO
ground voltage supply
GW0AJU bitx40 vfo code
HF cw/ssb 40m, 20m, 15m QRP vfo
HF mobile antenna
HF single band digital VFO with 9MHz I.F. for CW
Iambic Morse Keyer ( picaxe 08m2 )
LA3600 5 Band AF equaliser
LF and MF mobile antenna
Lumped Component Antenna
Marconi Digital I.F. interface.
Marconi HF-Rx1: 50 KHz to 75MHz
Marconi HF-Tx1: 50 KHz to 75MHz
mobile phone antenna
noise-less switchable attenuator
not used yet
off-centre full wave dipole
picaxe 08m2 sound command
Picaxe QRP Beacon
R.F. front ends.
R.F. Local Oscillators.
Raspberry PI to Arduino serial port
si5351 Lower Tri-band Software
Top hat antenna loading
Trap dipole 80m to 10m
tri-band digital vfo application code details and switch wiring
Usefull links to Ham Radio website references
Variable capacitance diodes
VNA test calculations
WARC HF Band digital vfo
Radio Ham Technology : by Alastair GW0AJU
Home
10Watt Two Metre Run
Audio Tone Controls
Lumped Coil Yagi HF antenna
Microphone headphones
Simultaneous Tri-band ham radio set
Stable op-amp amplifier circuits
Visual Basic antenna design code
bitx40 with signal meter
HF power “S” meter readings
SSB power
solution to overcome the "app.publish" folder in vb.net
BHI HP-1 headphones
cb 27/81 limits
Choosing you power supply unit for your radio
"ATU" design ideas and "SWR " measurement principles
10m to 70cm mobile antenna
49er active bridge
49er active bridge v2.0
49er active bridge v3
49er digital vfo
9:1 balam feed long wire antenna
A bench test "RF on air noise floor measurement"
A.F. spectrum bar graph display
AC and DC gain of amplifier circuits
active bridge v4
All HF Touch Screen Digital vfo
Antenna Suspects
Arduino QRP Beacon
Audio data FSK encode / decode
Audio Signal Processing
Bitx40 signal propagation
bitx40 tone beep ptt
coax hidden antenna load
Comparing a S9 signal at HF to S9 at VHF or UHF
Cross position load coil antenna for HF band plan
Digital BFO for tri-band radio software
digital vfo code for 15m, 12m, 10m band
digital vfo code for 160m, 80m, 40m band
digital vfo code for 30m, 20m, 17m band
digital vfo code for LF, 600m, 60m band
Direct RF sampling "SDR radio"
Discussion of Radio Frequency Mixers
Dual mode active bridge
emf distance
General purpose active SWR meter
general purpose CW SSB BFO
ground voltage supply
GW0AJU bitx40 vfo code
HF cw/ssb 40m, 20m, 15m QRP vfo
HF mobile antenna
HF single band digital VFO with 9MHz I.F. for CW
Iambic Morse Keyer ( picaxe 08m2 )
LA3600 5 Band AF equaliser
LF and MF mobile antenna
Lumped Component Antenna
Marconi Digital I.F. interface.
Marconi HF-Rx1: 50 KHz to 75MHz
Marconi HF-Tx1: 50 KHz to 75MHz
mobile phone antenna
noise-less switchable attenuator
not used yet
off-centre full wave dipole
picaxe 08m2 sound command
Picaxe QRP Beacon
R.F. front ends.
R.F. Local Oscillators.
Raspberry PI to Arduino serial port
si5351 Lower Tri-band Software
Top hat antenna loading
Trap dipole 80m to 10m
tri-band digital vfo application code details and switch wiring
Usefull links to Ham Radio website references
Variable capacitance diodes
VNA test calculations
WARC HF Band digital vfo
More
Home
10Watt Two Metre Run
Audio Tone Controls
Lumped Coil Yagi HF antenna
Microphone headphones
Simultaneous Tri-band ham radio set
Stable op-amp amplifier circuits
Visual Basic antenna design code
bitx40 with signal meter
HF power “S” meter readings
SSB power
solution to overcome the "app.publish" folder in vb.net
BHI HP-1 headphones
cb 27/81 limits
Choosing you power supply unit for your radio
"ATU" design ideas and "SWR " measurement principles
10m to 70cm mobile antenna
49er active bridge
49er active bridge v2.0
49er active bridge v3
49er digital vfo
9:1 balam feed long wire antenna
A bench test "RF on air noise floor measurement"
A.F. spectrum bar graph display
AC and DC gain of amplifier circuits
active bridge v4
All HF Touch Screen Digital vfo
Antenna Suspects
Arduino QRP Beacon
Audio data FSK encode / decode
Audio Signal Processing
Bitx40 signal propagation
bitx40 tone beep ptt
coax hidden antenna load
Comparing a S9 signal at HF to S9 at VHF or UHF
Cross position load coil antenna for HF band plan
Digital BFO for tri-band radio software
digital vfo code for 15m, 12m, 10m band
digital vfo code for 160m, 80m, 40m band
digital vfo code for 30m, 20m, 17m band
digital vfo code for LF, 600m, 60m band
Direct RF sampling "SDR radio"
Discussion of Radio Frequency Mixers
Dual mode active bridge
emf distance
General purpose active SWR meter
general purpose CW SSB BFO
ground voltage supply
GW0AJU bitx40 vfo code
HF cw/ssb 40m, 20m, 15m QRP vfo
HF mobile antenna
HF single band digital VFO with 9MHz I.F. for CW
Iambic Morse Keyer ( picaxe 08m2 )
LA3600 5 Band AF equaliser
LF and MF mobile antenna
Lumped Component Antenna
Marconi Digital I.F. interface.
Marconi HF-Rx1: 50 KHz to 75MHz
Marconi HF-Tx1: 50 KHz to 75MHz
mobile phone antenna
noise-less switchable attenuator
not used yet
off-centre full wave dipole
picaxe 08m2 sound command
Picaxe QRP Beacon
R.F. front ends.
R.F. Local Oscillators.
Raspberry PI to Arduino serial port
si5351 Lower Tri-band Software
Top hat antenna loading
Trap dipole 80m to 10m
tri-band digital vfo application code details and switch wiring
Usefull links to Ham Radio website references
Variable capacitance diodes
VNA test calculations
WARC HF Band digital vfo
Usefull links to Ham Radio website references
http://www.ab4oj.com/atu/main.html
http://www.vk2zay.net/article/93
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