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
Revival of SLBC MW Broadcast on 1548 kHz via Former DW Trincomalee Transmitter
On the evening of 3 October 2025, radio listeners across Tamil Nadu were pleasantly surprised: broadcasts soon resumed on the Medium Wave frequency 1548 kHz using the high-power transmitter in Trincomalee, Sri Lanka — the same facility that formerly belonged to Deutsche Welle (DW). What We Know The test broadcast started at 8:00 PM IST […]
Quansheng UV-K5/UV-K6 Radios Get New MCU, Firmware Risks
New Quansheng UV-K5/UV-K6 radios use a PY32 MCU incompatible with STM32 firmware — flashing custom firmware can brick the radio, making MCU identification critical before updates
145 MHZ Delta Loop VHF Antenna
Build your own Delta Loop VHF antenna for 145 MHz with our clear diagram, dimensions, instructions, explains construction, feed point, and tuning tips.