band pass filter

2 element Quad antenna  ^{updated  pop} - Detailed instructions about a 2 elem. quad antenna for 10,12 and 15 meters band, by iz7ath, Talino

Rotatable Dipoles  ^pop - Portable, and shortened with loading coils rotatable dipoles for 6 meters, 20 meters and multibands.

RockLoop Antenna  ^pop - A Compact antenna for 10.1, 14 & 21 Mhz Bands. A multiband portable antenna suitable for QRP operations.

CB Quad antenna  ^pop - A low-cost and easy to build Quad antenna tuned for CB band on 27 Mhz.

Antennas for SW Broadcasters - All antennas for shortwave broadcasting, Log-periodic, Dipole Arrays, Curtains antennas, rhombics, broadband dipoles with photos and details.

Yankee Oscar Club - Yankee Oscar Club of Northeastern Ohio using the sideband freq.

Top Ten Devices - Automatic band decoder, six way antenna relay, band reject coaxial stubs and more

K-Com - comprehensive line of products for rejection of Radio Frequency Interference (RFI) to telephone equipment.

Spi-Ro Manufacturing Inc - Transmitting & receiving multi-band antennas covering 1.8 thru 55 Mhz.

Wellbrook Communications - Broadband active loop antennas for radio amateurs and hobbyists

Industrial Communication Engineers - RF parts, filters, rf switching products.

W2IHY Audio Products - Band audio equalizer and noise gate compatiable with ICOM, KENWOOD, YAESU and other radios

Small Wonder Labs - PSK31 transceivers and transceiver kit, CW monoband kits and QRP kits

Diamond Antenna  ^pop - Base station and repeater antennas, mobile antennas, ,multi-band HF antennas , handheld transceivers, receiving and scanner antennas, power meters, swr meters, power supplies, coaxial switches

MT63 HF mode - MT63 is a DSP based advanced HF mode for Amateur Radio, intended to provide high performance keyboard - to - keyboard conversational operation on HF bands under poor conditions

Hellschreiber beacon project - This web site describes a low power beacon system to be used for propagation and performance tests on the lower bands. The beacon offers CW (on-off keyed) modes and FSK modes; the traditional Morse ID mode, and Feld-Hell, another highly noise immune CW mode.

Andrews Communications Systems - Australian dealer, HF linear amplifiers, power supplies, baluns, HF UHF yagis and verticals including multiband HF verticals.

PC-ATV - PC-ATV is a program to generate testcards on your PC for tx over the ATV bands now with over 40 testcards from around the world. QRA and DTMF programs included.

Control program for TM-D710 - Code for controlling the frequency and the band on the Kenwood TM-D710. C code for configuring the TNC on the Kenwood TM-D710.

RemIcom-B - Freeware RemIcom-B is a very simple ICOM remote program. Display of current frequency, mode and filter ITU HF Band assignment (ITU Region 1, 2 and 3 selectable) HAM HF Band usage analog frequency band display

Ham Helper - Ham Helper is a tool that will help Ham Radio operators with many tasks. Features include UTC Time display, Callsign Country lookup, internet callsign lookup, band plans, W1AW schedule, bearing/distance calculation and more.

PLL2 - 2nd Order phase locked loop design for passive and active circuits. Bode plot, step response, design parameters

CBTricks  ^pop - We intend to provide a wide variety of technically oriented infomation aimed at the Citizens Band, Amateur, and FRS Bands

SSB and CW Filter - A pdf file with schematics of an ssb and cw filter AF amplifier

Toroid Pro - Designed by microwave engineers to provide filter, radio,microwave and Ham radio engineers with all relevant information of an inductor and core at his or her finger tips