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Speaker Wire Delta Loop Antenna for 20M - WB3GCK
The antenna I built was inspired by a portable delta loop designed by Doug DeMaw ...

[ Hits: 128 | Votes: 0 | Rating: 0 ]

40m Wire Antennas Comparison - PH0NO
On the field comparison among C Pole antenna an EFHW vertical antenna and an Inverter ...

[ Hits: 172 | Votes: 1 | Rating: 3 ]

40m QRO End Fed Half Wave Antenna Coupler - AA5TB
A medium power End Fed Half Wave Antenna coupler specifically tuned to the QRP frequency ...

[ Hits: 105 | Votes: 0 | Rating: 0 ]

Chokes and Temperature changes - PA0NHC
The influence of temperature changes in Common Mode Chokes To get an indication of the ...

[ Hits: 46 | Votes: 0 | Rating: 0 ]

XW4DX LAOS DXPedition - XW4DX
XW4DX DXpedition to Laos 16 to 27 November 2023 We will be operating on all ...

[ Hits: 12 | Votes: 0 | Rating: 0 ]

Frequency Accuracy and Stability of WWV and WWVH - K0WWX
Measuring the Frequency Accuracy and Stability of WWV and WWVH by Michael A Lombardi An ...

[ Hits: 81 | Votes: 0 | Rating: 0 ]

QO-100 with LimeSDR - LimeSDR
QO 100 Communications with the LimeSDR Family LimeSDR can transmit in the expected uplink frequency ...

[ Hits: 77 | Votes: 0 | Rating: 0 ]

40 MHz 8m Band Amateur Radio Exploration - G3XBM
The 8m ISM band a unique frequency range between 10m and 6m holds potential for ...

[ Hits: 76 | Votes: 1 | Rating: 8 ]

Propagation on 630 Meters and 2200 Meters - K9LA
This is a theoretical look at propagation on 630 Meters and 2200 Meters using ray ...

[ Hits: 39 | Votes: 1 | Rating: 10 ]

ICOM IC-R75 Review by N9EWO - N9EWO
Icom IC R75 tabletop HF communications receiver came onto the market back in 1999 and ...

[ Hits: 44 | Votes: 0 | Rating: 0 ]

MSF radio time signal - NPL
The MSF radio signal is a dedicated standard frequency and time broadcast that provides an ...

[ Hits: 50 | Votes: 1 | Rating: 10 ]
JJY - NICT
JJY is a time signal transmitter operated by the National Institute of Information and Communications ...

[ Hits: 31 | Votes: 0 | Rating: 0 ]
Radio Station WWV - WWV
NIST radio station WWV broadcasts time and frequency information 24 hours per day 7 days ...

[ Hits: 53 | Votes: 1 | Rating: 10 ]

70 MHz 300 W Power Amplifier - EX8MLE
This PA has been designed by Sergey EX8MLE and uses three Mitsubishi RD100HHF1 FETs Frequency ...

[ Hits: 109 | Votes: 1 | Rating: 10 ]

Arduino QRP Transceiver: DIY Success on HF Bands - M0XPD
This article introduces an Arduino based QRP CW Transceiver designed for lower HF bands The ...

[ Hits: 115 | Votes: 1 | Rating: 1 ]

A switched Capacitor Audio Filter - AA8C
Here is a rather nice audio filter for use with Ham Radio gear It features ...

[ Hits: 73 | Votes: 0 | Rating: 0 ]

A 2 meter band-pass cavity using surplus Heliax - ka7oei
Cavity is often required at a busy site to not only prevent its receiver from ...

[ Hits: 130 | Votes: 2 | Rating: 3 ]

PCM Kestrel HF Transceiver - vk3yy
This article describes an upgrade to the Kestrel transceiver replacing its LCD display with a ...

[ Hits: 68 | Votes: 0 | Rating: 0 ]

Understanding computer-generated RFI - NU1N
Radio Frequency Interference RFI has always been a source of concern for the Radio Amateur ...

[ Hits: 84 | Votes: 0 | Rating: 0 ]

2m to 70cm Transverter Circuit - VK4ADC
A 70cm 432 MHz Transverter Project transverter circuit is an electronic device that converts a ...

[ Hits: 82 | Votes: 0 | Rating: 0 ]