A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
HF Skeleton Slot An antenna system with a difference.
Remotely-Operated 1200 Baud AX.25 Narrowband Packet Radio and APRS on a Baofeng UV-5RA and Raspberry Pi 2
This article is designed as an introduction to some of the more popular digital modes. From HSCW to FT8 and interesting article with detailed information on popular and historical amateur radio digital modes.
BlueDV Android is DMR/DSTAR and Fusion hotspot software for Android 4.x and higher. It supports DSTAR (DEXTRA, DPLUS, DCS), FUSION (YSF, FCS), DMR ( Brandmeister, DMR+)
Soundmodem is a free software defined dual-port Packet-Radio TNC that implement a soundcard as a modem and supports AX.25 protocol. Soundmodem has been tested on Windows XP, Vista, 7, 8, 10 and has proved stable in operation. The Soundmodem may be used to build EMCOMM, APRS, BBS, Node station, for satellites
What is a QSL Card and what should be the content of each QSL card, collecting cards, electronic QSL LoTW eQSL, QSL Bureau, and QSL managers.
With Doozy for Windows you can make QSO’s via your Windows PC on DSTAR ( DPLUS, DEXTRA, DCS and XLX ). There is no need for a hotspot. Just connect your ICOM IC-705 to your Windows PC with an USB datacable and connect it to your favorite DSTAR reflector/repeater.
System Fusion is Yaesu’s implementation of Digital Amateur Radio, utilizing C4FM 4-level FSK Technology to transmit digital voice and data over the Amateur radio bands
System Fusion is a digital communications mode for voice and data, including pictures. It utilizes a customized, yet open, C4FM FDMA standard. An introduction to Yaesu System Fusion by Wireless Society of Southern Maine