Learn to build a 145 MHz/433 MHz collinear antenna with 0.64λ radiators, 0.25λ phasing stub, and direct 50 Ω feed for compact high-gain VHF/UHF stations
Month: October 2025
Popovic Dual Band Antenna for 2m and 70cm Bands
Build the Popovic dual band antenna for 2m and 70cm bands — a simple, efficient DIY VHF/UHF antenna with excellent SWR, omnidirectional pattern, and easy home construction
Pocket SI4735 Dual Core Decoder – Latest Firmware Elevates ats Mini Radio
Pocket SI4735 Dual Core Decoder firmware upgrade adds 400 kHz waterfall, improved SSB/CW/RTTY decoding, and faster scanning — transforming the ATS Mini into a powerful DSP pocket receiver.
Building End Fed Half Wave antenna (EFHW) for 40M – 10M
DIY EFHW antenna for 40 m–10 m: a 10.1 m multiband end-fed wire with 34 µH loading coil and 49:1 UNUN matching for portable HF and limited-space stations
Shrinking the Dipole: Building the Shorty Forty Antenna for 40M Band
Build the Shorty Forty — a compact 7 MHz dipole using center-loaded coils to shrink a 40 m antenna to 25 ft while maintaining resonance and solid HF performance in limited space
Build Your Own Indoor Antenna for 7 MHz HF Band
Build a compact indoor 7 MHz (40 m) HF antenna using coil-loaded wire sections and 75 Ω feed — a stealth, space-saving solution for apartment and indoor ham radio operation
40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation
Build a compact 40 m vertical antenna using a 3.4 m radiator and 15 µH base-loading coil — a shortened quarter-wave HF vertical delivering strong 7 MHz DX from limited space.
Compact 40M HF Antennas: Short Dipoles & Short Verticals
Explore compact 40 m HF antennas including shortened dipoles and base-loaded verticals for space-limited ham radio setups. Practical designs enable effective 7 MHz operation in small yards, portable, or restricted installations
GM4JMU Shortened Dipole Antenna: Compact Performance for HF Bands
The GM4JMU shortened dipole uses loading coils to deliver full 40 m band performance in under 10 m span. Ideal compact HF antenna for small gardens, rooftops, and portable ham radio installations.
kv4p HT project -Turning Your Android Phone Into a Ham Radio
KV4P-HT turns an Android phone into a VHF/UHF ham radio via USB-C — an open-source ESP32 + SA818 transceiver add-on with APRS messaging, 1 W output, and fully off-grid operation