hf propagation

13 elements Yagi antenna for 144 MHz - DJ9BV yagi antenna for 2 meters band

Balun for HF wire antennas  ^pop - Schema of a self made balun used to match randmon wire antennas, mainly for shortwave listening pourposes, in italian

Build a Double Bazooka HF antenna  ^pop - Build a double bazooka coaxial dipole, broad-band dipole antenna

Wire delta-loop antenna - Description of a delta loop antenna for HF bands in french

Ladder line J-Pole - Building a VHF or UHF Ladder Line J-Pole Antenna

HF portable antenna - 40 to 6 meters  ^pop - Phil Salas AD5X 40 through 6 meter HF portable multiband antenna, construction article, plans, and photos

The VHF Dxpedition to Dominica - Main goals of this dx pedition was test out a MID SIZE 2MXP20 dual polarity or cross polarized Yagis in a field environment and shoot for a record number of EME QSO's using this system

Hustler antennas - A new tronics company, antenna maker, HF vertical antennas, vhf antennas, cb antennas

Butternut antennas - A Bencher antenna divsion, manufacturer of HF YAGI and Vertical antennas

Antennas by Antenex - Signal Propagation Systems, mobile HT base antennas

Q15X25 - Q15X25 is a packet modem with a KISS/AX.25 interface designed for HF transmission of AX.25 packets and TCP/IP using Automatic Repeat reQuest (ARQ) and forward error correction (FEC).

WinDRM - HF Digital Radio Mondiale - WinDRM is the hottest digital mode on HF today! Nothing else exists where you can transfer data at almost 1KB/s without using proprietary hardware. HF Digital Radio Mondiale allow fast data, pictures, and voice over a 2.5Khz bandwidth

JT65 - JT65 is a digital protocol intended for Amateur Radio communication with extremely weak signals. It was designed to optimize Earth-Moon-Earth (EME) contacts on the VHF bands, and conforms efficiently to the established standards and procedures for such QSOs.

Icom IC-746 specifications - This page includes fatures, specifications options and photos of the ICOM IC-746

Low cost frequency stabilisation - The Icom IC-746 is quite a popular HF/VHF multimode transceiver which has one shortcoming in its standard configuration when used to operate modes requiring good medium-term frequency stability.

FT-817, FT-847, FT-857, FT-857D, FT-897 and FT-897D Memory Cloning - The complete status of the FT-817, FT-847, FT-857, FT-857D, FT-897 or FT-897D memories can be read into the computer and saved to disk. Any saved file can be subsequently reloaded into the computer and sent back to the rig. This facility uses these rig's ability to clone configurations from one rig to another using the serial port.

Yaesu FT-857 specifications - Yaesu FT-857 features and specifications

Yaesu FT-857D specifications - Features and specifications for Yaesu FT 857D

Yaesu FT-857 description - FT-857 HF/50/144/430 MHz ALL MODE HF/VHF/UHF Transceiver

Yaesu FT-857 description - The FT-857, the world's smallest HF/VHF/UHF mobile transceiver, provides base station-type performance from an ultra-compact package that's ideal for mobile or external battery portable work.

Yaesu Ft-897 specifications - Includes some original photos and features

Yaesu FT-897D System Diagram - Interconnecting the YAesu FT-897 or 897D

Yaesu FNB-78 battery for FT-897 - The Yaesu FNB-78 Battery plugs into the FT-897/D. It produces 13.2 VDC at 4500 mAh. The radio can hold one or two and one can be in use while the other is charging.

Grandicelli - Hf-vhf-uhf-shf-digital-monitoring-site,wavecom Decoder and tools, winradio and DRM decoders, WD3000 Direction Finding System , radioraft software. PFSL3000 Integrated HF-VHF-UHF signal monitorin

Ciro Mazzoni - From 1973 we work in the communication system on HF, VHF, UHF, SHF for P.M.R., OM and broadcasting.