data transmission

Russian Callsign database - Russians Ham on-line lookup database. Search and create new callsign records. The most full russian and CIS callsign database (more 50,000 CIS records). More than 1,400,000 international calls.

Ham Radio Deluxe DX Spots - Ham Radio Deluxe DX Cluster data is taken from the Amateur Radio DX cluster using DXSpider

QRP Calling Frequencies - Where to operate QRP

Clover - Clover technical specifications, digital communications mode that conveys 8-bit digital data over narrow-band high-frequency radio.

Mfsk - MFSK is an easy-to-use chat mode for real-time amateur contacts, nets and bulletin transmissions, but not intended for contesting or Bulletin Board System (BBS) use. It is a half-duplex non-Automatic Repeat ReQuest (ARQ) forward-error-correcting (FEC) mode. It performs well on long-path fading conditions and in the presence of interference

Olivia - The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.

Pactor - PACTOR can be viewed as a combination of two earlier digital modes, packet radio and AMateur Teleprinting Over Radio (AMTOR). PACTOR provides improved throughput because its transmission speed adapts to the quality of the link and it uses Huffman compressed characters.

Pactor III - PACTOR-III is a software upgrade for existing PACTOR-II modems that provides a new data transmission mode for improved speed and robustness. PACTOR-III is not a new modem or hardware device. Most current PACTOR-II modems are upgradeable to use PACTOR-III via a software update since PACTOR-II firmware accommodates the new PACTOR-III software

Psk31 - PSK31 is a digital communications mode which is intended for live keyboard-to-keyboard conversations, similar to radioteletype. Its data rate is 31.25 bauds (about 50 word-per-minute), and its narrow bandwidth (approximately 60 Hz at -26 dB) reduces its susceptibility to noise.

Mfsk - MFSK is an easy-to-use chat mode for real-time amateur contacts, nets and bulletin transmissions, but not intended for contesting or Bulletin Board System (BBS) use. It is a half-duplex non-Automatic Repeat ReQuest (ARQ) forward-error-correcting (FEC) mode. It performs well on long-path fading conditions and in the presence of interference

Unusual HF Propagation Phenomena - This page has a collection of audio samples from unusual HF propagation phenomena, from round-the-world propagation to moonbounced signals , and to ducted transmission.

Icom - IC-706 Picture and data - Large picture and technical specifications by rigpix

Icom IC-706 Radio mods db  ^pop - Info and mods for IC-706, IC-706 Expanded frequency IC706 - spare 0.3A, MARS/CAP Modification for ICOM IC-706, enables out-of-band transmit for 1.6 MHz to 54 MHz, ore sensitive transmit for 2 meter IC-706 60 MHz to 200 MHz band pass filter, Icom IC-706 Extended RX mod, ICOM 706 MKII Extended transmit mod, Special on IC706mkII TX range expansion for IC-706MKIIG, Expand only mod for the IC-706MkII

Icom IC-718 picture - Large picture of Icom IC-718 by Rigpix database

Yaesu FT-100 CAT connector - Yaesu FT-100 Data (CAT) MiniDIN 8-Pin Connector by WA8LMF, pdf file

Modifications for the Yaesu FT-817 by KB2LJJ - KB2LJJ Radio Mods Database

KB2lJJ radio mods TH-G71A and TH-F6A - Another page dedicated to TH-F6A modifications

Rigpix database - Yaesu - VX-150 - Picture and specifications

Yaesu VX-150 mods - Expanded Transmit for the Vertex VX-110 & VX-150 and MARS/CAP modification for VX-150R 140-174 MHz

Rigpix database - Yaesu - VX-5R - Picture and specification about yaesu VX-5R

Tealinfo reference for Yaesu VX-5R - TealInfo Reference for Yaesu VX-5R, software for PalmOS

Modifications for the Yaesu VX-5R - VX-5R Loose antenna cure, Vx-5r Free Band, VX 5 R modification for German, VX-5R expanded frequency mod, VX-5R MARS/CAP & freeband mod

KB2LJJ mods for 2725 - IC-2725 mods

Sierra mods - This is a collection of emails collected over time which indicate how to put some mods into your Sierra transceiver. Most of the mods have to do with improving the power output.

Pixie2 - Pixie-2 schematic and part lists