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Electronics, RF & microwave by 9M2LCL
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Compact & blocker-tolerant low-noise amplifier for satellite radio
SDARS-GNSS LNA that can coexist with cellular
Projects
Files
Spurious parametric oscillation & cure
Aerials
Icom Pcr1000/1500 aerial modified for balcony mounting
Rubber ducky for FM broadcast band
70-210MHz inverted skeletal discone
3.5 GHz coffee-can horn
Evaluation of HGANT-0809/1727-2-1-10 log periodic, 0.8-2.7 GHz
Plotting aerial pattern with Excel
PA0NHC mini-whip
MLA-30 active loop noise reduction
Aerial simulation network / dummy aerial for active loops
MLA-30+ evaluation
LZ1AQ active loop performance evaluation
PA0FRI active loop evaluation
Comparing LZ1AQ, M0AYF, PA0FRI and MLA-30+ active loops
Transmitters and receivers
Radio control using PWM
Stable FM microphone
MC3356 VHF FM receiver with automatic frequency control
Permeability tuner's last stand
FM broadcast receiver in function blocks
Proximity detector - primitive radar
Receiving sub-systems: low noise amplifier
BF988 masthead amp for 435 MHz / 70 cm with phantom power
LNA articles
Very low noise preamp (0.4 dB NF) for 1296 MHz & 1420 MHz
Very low noise preamp (0.4 dB NF) for 435 MHz / 70 cm
Receiving sub-systems: wideband receive pre-amplifier
Wideband pre-amplifier using discrete transistor
MAR6 / MSA-0685 wideband gain block as masthead amplifier
Receiving sub-systems: detector & demodulator
What simulation of the Foster-Seeley discriminator can reveal
FM demodulation using a mixer IC
1.8 GHz voltage doubler detector
10.7 MHz Foster-Seeley FM demodulator
Temperature compensation of diode detectors
General electronic projects
Increase power output in cheap PC speakers
Prevent PC noises from interfering with reception in a PCI TV tuner card
Electromagnetic compatibility
Cellphone radiation detector
Improve shielding in enclosures fabricated from PCB
Test equipment / accessories
DC-1GHz switch from a common toggle switch
Directional wattmeter with plug-in couplers
Simple 10MHz-1.5GHz biastee
GOOIT Gy550 frequency counter's lower frequency limit and operating beyond 1 minute
Dummy load 8W using leaded resistors
Simple case for the nanoVna V2+
Directional coupler's test fixture
A cheap biastee for active loop / whip
Improving tinySA's system IP3
6-way antenna switch using a common rotary switch
Improved biastee for active loop / whip
Cables & connectors
SMA edge launch connector mounting for lower loss
Cheap BNC-m connector for LMR-400 coax
LAN/Ethernet cable for connecting to active loop aerial
Attenuators
PIN diode attenuator simulation
Reducing attenuator loss using ferrite beads
Mixer
Diode ring mixer with Guanella baluns & its simulation
Resistive (passive) FET mixer for 2.4 GHz
Oscillator
Crystal oscillator <1 MHz
Controlling a YIG oscillator from a power supply
What oscillator simulation can show
Miscellaneous RF
Modelling ferrite beads
RF papers with suspicious results
Radio Astronomy
Proposed low-band LNA for the Square Kilometer Array
Radio observation of the 22nd August 1998 solar eclipse
About me
Electronics, RF & microwave by 9M2LCL
3.5 GHz coffee-can horn
3.5G conical horn.pdf
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3.5G conical horn.pdf