band pass filter

The TTFD-2 antenna - The lowest-cost approach for home brewing broadband, general-purpose antenna for shortwaves

Dualband-Beam 12/17 m - The beam has only one feedpoint with 50 Ohm and has an open-sleeve element for 12 m by DK7ZB

PV6 Yagi antenna - 6 elements yagi beam for 15 meters band, by T73M

Loop Antenna for 6m  ^pop - Indoor loop antenna for six meters band, project by Colen Harlow, G8BTK

The W2PM Mini Diamond Receiving Flag - This description is taken from the Pete's W2PM posting into Topband reflector.

1270Mhz Yagi Antenna - Build your own antenna for the 23cm band ( 1250Mhz - 1280Mc ) using some aluminium and this simple design.

Mailbox DBO274 - Citizen Band mailbox DBO274 in Germany with HTTP/telnet-access

SSTV Nets and Frequencies - SSTV ONLY nets on ham radio bands

Jonathan's QSL Card Page - Mediumwave, shortwave, and amateur bands QSL cards collection

FCC Bandplan  ^pop - FCC Frequency Bandplan even if outdated is a good starting point to have a basic frequency list

RSGB HF Data Band Plans - The following frequencies are assigned to datacommunications in the HF bands within the UK By RSGB data communications committee information.

The Mud Duck SiteRing - A SiteRing for CB/Freeband/Ham radio operators.

RM Italy  ^{updated  pop} - RM is an Italian company operating in the radio communication field since 1974, main products are: HF-CB-VHF-UHF-Dual Band Amplifier, Power Supply, DC-DC Converters Antennas and more

T.G.M. Communications - MQ-1 four band HF beams 20,15,10,6 meters MQ-2 six band HF beams 20,17,15,12,10,6 meters, beam antennas and Hybrid Quad antennas

Adaptive Broadband Corporation - Point-to-point fixed and mobile microwave radios for television and other broadcast requirements

NSI-N Systems, Inc. - Triple-band (2-2.5 GHz, 6.5-7 GHz, 12-13 GHz) central receive systems with automatic airborne tracking.

SSTV Frequency list - Where to look on the Bands for SSTV

ISS Realtime tracking - 5 Day prediction table for ISS and find when the ISS will be visible from your QTH by N2YO

PSK31 explained - PSK31 bandwidth explained and related links by w5bbr

Spectran - Program designed to do spectral analysis and real-time audio filtering on reception of audio signals for EME, VLF, SETI applications. Offer support for MTHELL, QRSS, DFCW, NDB, WSJT by I2PHD

BBA-C1 Amplifier Card - This versatile broadband amplifier is used in several DX Lab projects.

70cm GS-23b Amplifier - 1500 watts amplifier for 70 cm band using GS23B /4CX1600U SVETLANA by LZ2US

KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter

Frequency and VFO - How to keep from being out of band

High-speed packet 23cm - 23 cm wide-band transceiver for high-speed data or audio by PE1JPD