channel pass

G3YXM Small Loop - This simple antenna is capable of remarkable results on 160, 80 and 40 metres. Forming a triangle from around 50 feet of satellite TV coaxial cable, the top of the triangle can be as low as 15 feet, and the lower side just high enough to prevent a passer by hanging themselves

Loughborough & District Amateur radio club - Loughborough and District Amateur Radio Club (LADARC) takes it\'s membership from the north west part of Leicestershire encompassing Loughborough, Shepshed, Coalville, Whitwick and Castle Donington.

WR7HLN Mac Pass Repeater Group - The Mac Pass Repeater Group is the Amateur Radio club associated with the Mac Pass Radio, LLC company

Chicago Fire Dept. Emergency Services - LIVE 911 audio of the Chicago Fire Department North & South channels.

Illinois - Chicago Police - Illinois Cook County, police scanner includes Chicago Fire Dispatch channels (North, South, and HazMat)

Clifton Laboratories - Band Reject Filters, Bandpass Filter, Active Antennas, amplifiers and preamplifiers

Cross Country Wireless - UK manufacturer of ham radio accessories, including TNX, SDR receivers, RF Diplexers Triplexers, bandpass filters, iambic memory keyers.

G6GVI's data transmission page - WinDRM for rapid data transmission over radio channels. A quick-start guide by Ross G6GVI and Jack G8HIK

Elecraft K2 Improving CW Filter - Here is a cheap and simple way to significantly improve the K2 CW filter(s). With this mod, even strong signals will fade to black as they tune out of the filter pass band

K2 Change 20 30m band filter - Elecraft K2 mod. Narrower bandpass filter, better stopband attenuation

Elecraft K2 - Narrow Bandpass Filter - This note covers narrowing the K2\'s 40M bandpass filter to cover the narrower 40M band and reject strong out of band broadcast interference

Adding SDR to the Yaesu FT-920 - Add a second receive channel to the FT-920, to provide SDR and bandscope capability.

Baofeng UV-3R Low pass Filter Mod - This page describes a fix to the Low Pass Filter that provides more filtering of the second harmonic of 144-148 MHz.

U.S. VHF Channells - US coast guard frequency list

Marine Radio in Canada - VHF channel usage, making a mayday call, and related informations

Scanecoute - Scanecoute - French radio scanning portal, la passion des ondes VHF UHF Forum,tchat,site consacre l'ecoute des frequences a l'aide de recepteur scanner .

Fairview Microwave Inc - Supplier of RF, Microwave, & Wireless passive coaxial components, including Coaxial Attenuators, Adapters, Cables, DC Blocks, Terminations, & Connectors

Rotor Parts - Dedicated to serving for all rotator parts needs. Stock and provide rotor parts for antenna rotators from companies such as Alliance, C.A.T.S., CDE, Channel Master, and Hy-Gain, both young and old.

HamSatDroid - This software predicts future passes for amateur radio satellites for a specified location and period of time. It runs on the Android operating system

2.4 GHz FM ATV - 2.4 GHz FM ATV - a project concept

Homemade Antenna Rotator Controller - The Antenna Rotator Controller is unique in that it senses, displays, and controls to the earth’s true magnetic field. The compass sensor, mounted in a waterproof enclosure, is attached to the mast and sends its signal to a microcontroller. By kg4jjh

OZ2M - Next generation beacon - Next Generation Beacon hardware platform encompasses both analog and digital modes, i.e. CW FSK and MGM in a mixed mode configuration. The advantage of the mixed mode is that humans can decode the CW FSK by ear and the MGM can be decoded by computers way below what is audible. Therefore the MGM can be used for “pre-human-conditions” or early warning monitoring.

VHF Broadcast Passband Filter - VHF Broadcast Passband Filter (88 108 MHz) by DF9CY

Bandpass Filters for Portable Usage - These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.

30 m Band Direct Conversion Receiver - The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.