rf spectrum

Vertical antenna for 2 mt and 70cm  ^pop - How to Build a Dual-Band Antenna for 2M/70cm

DF2PI - Amateurfunk - QRP and photos ham blog de DF2PI

KB3KAI David stansbury - David stansbury kb3kai, amateur radio site with live harford county weather feeds, ham technical info, blog and more

RF Electronics - 500 W, KW and 6M ham radio amplifier kits for export

MAXRAD Antennas - manufacture networking antennas and accessories for 802.11a, 802.11b and 802.11g WiFi (Wi-Fi) and WiMAX applications, including wireless bridging, wireless LANs, RFID and wireless hots spots

Austin Antenna - Austin Antenna employs leading-edge antenna technology in the production of the highest performance antennas currently available. Marine Antenna, Multi-band Mobile, Point-to-Point, Base Station, Wide-band Land Based, LPDA, Linear Omni, Triplexer, Scanner Antennas

A & A Engineering - Smart Battery Chargers, WeatherFAX, Color SSTV,GPS-Based Frequency Standard, Power/SWR Meter, , Digital Frequency Synthesizers

Donner's digital interface - Donner's digital interface sales. Interface that will let you connect your amateur radio and computer to receive digital modes of communication like PSK31, RTTY, CW, SSTV Also have rig control interfaces.

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

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).

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

FT-1K OptoCAT - The simple and safe RS232 CAT interface for Yaesu FT-1000MP, FT-1000MP Mark V and FT-1000MP Mark V Field rigs

Connecting the Yaesu VL-1000 (quadra) to the FT-1000MP/MkV - based on an FT-1000MP Reflector discussion with Bill Heinzinger, W9OL, 15/16 November 2002

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 mods  ^pop - Modifications, schematics, programming interfaces and manuals for the Yaesu FT-897

Yaesu FT-897d mods - Programming interface schematics for Yaesu FT-897D programming interface, Yaesu 4 pin plug PDF User Manual for Yaesu FT-897D (FT 897 D FT897D)

Icom V8000 mobile amateur transceiver - Universal radio IC-V8000 page includes accessories and photos

Eurocom-pro - High performance Software and Devices

RS232 interface for Kenwood rigs - SS232K - The simple and safe RS232 interface for Kenwood radios

G4AXX Voice keyer Interface - This voice-keyer-interface connects between a Yaesu FT1000MP and a PC's sound card & COM port. It can be used as a voice-keyer with Contest Voice Blaster and as a voice-keyer and CW-keyer with Writelog.

Grounding and RFI - Described system was designed to provide a high level of lightning protection - there are three levels of defense to guard against let-through. It isn't perfect, but does, however, follow good guidelines and shows measured improvements in RFI reduction.

QRP 12V Power Pack - A perfect companion for your Elecraft K1 or any other (not power hungry...) QRP rig

FT-1000MP interface - YAESU FT-1000/MP/MARK V (filed) interface, this one of numerous RTX sound blaster interfaces you can find on the internet, but this one include: FSK KEYING to use with the RTTY port, DVS-2 to use the interface in AFSK mode, this include all digital modes + voice keyer, CW KEYING

FT8x7 OptoCAT - The safe RS232 CAT interface and PA buffer for Yaesu FT-817, FT-857, FT897 and FT-100 rigs

K2 OptoCAT - The safe RS232 CAT interface and PA buffer for Elecraft K2