fir filter

How to make an end-fed antenna work  ^pop - Here is a sure fire way to make end-fed halfwave antennas fed with a 50 ohm coupler work - without long radials, grounds, chokes, voodoo.

FT-DX 100 and FT-100B by Yaesu Musen - Details and very early history of yaesu musen amateur radio equipment in australia . 1966 yaesu first trasceiver.

Antique shop - Puerto Rico's house of radio services and sales - San Juan, Puerto Rico First site dedicated to repair sales and restoration of antique radios and phonographs

CRX Cluster - CRX is the first CB Radio dx cluster to use map engine and webservice.

2E0BEJ Ben Sutton Priority listing - Blog discussing my Amateur Radio experiences including APRS, Fox Hunts, Construction, first steps into HF, etc

Jefferson County New York Live Scanner - Live Police Fire Rescue scanner for Jefferson County, New York.

DCI Digital Communications Inc. - Filters, Duplexers, Combiners Bi-Directional Amps

IK-Telecom - The official web-site of the firm IK-Telecom, Finland, manufacturer of base station antenna-feeder systems

RACOM - Radio modems - RACOM is a Czech company specialized in design and production of radio modems and other devices for wireless data networks for radio channels from 140 to 900 MHz. RACOM radio data networks are suitable for data transfer in telemetry & SCADA applications, transaction networks, security systems, IP networks and firts of all mobile tracking and fleet management.

Otto engineering - Otto engineering is comprised of two divisions otto controls and otto communications. otto controls designs and manufactures a full line of switches and grips used in heavy equipment, aerospace, marine, medical and other demanding applications. otto communications designs and manufactures audio accessories for two-way radios used in public safety, police, fire, retail, hospitality manufacturing and other markets.

FlexRadio Systems - Software Defined Radios - FlexRadio Systems delivers the first truly open source Software Defined Radio transceiver for Amateur Radio use. Receive Only versions are also available for non Amateur Radio applications. Read the SDR Articles and the SDR-1000 Product Information.

Telewave - Telewave's innovative engineering produces the industry's toughest antenna systems. Yagi, Fiberglass Collinear, and Dipole models are available from 66-2500 MHz. Wattmeters, test equipment,rf power meters, duplexers, filters and cavities, transmitters combiners

Telecom Product Profiles - Telecom Product Profiles is a manufacturers' rep firm specializing in factory direct Nello Towers, monopoles, antenna mounts, shelters, and more. Factory direct Cellular, PCS, and Wireless Broadband equipment such as antennas, radios, and more. Installation, financing, and leasing options available.

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

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 one board filter manual - IC 718 one board filter manual in pdf format

K3KY's FT-1000D Page - Articles, Links, and Mods

Paoletti Ferrero - Italian dealer based in Firenze Italy

CSDXC CZECH dx klub - The first and only BCB DX club in the Czech Republic and Slovak Republic, established in 1990.

HamCalc v1.3  ^pop - By G4VWL, HamCalc is collection of calculators for radio amateurs: Antenna ERP calculations. Attenuators. Audio Filter design.Coil Winding. Decibels. Great Circles map and calculator HF Filters HF Traps Metric conversions OP Amps QRA Locator to Latitude/Longitude (and back) Radio Horizon calculator Resonance Satellite orbit calculator Timer calculations (555 timer)Zener Diode calculations

UALOG, YVLOG, SQ, AutoCQ - UALOG, russian logbook, YVLOG log program for icon 756 radios, SQ echo repeater and DSP Filter for your radio

Propfire Firefox propagation extension - Propfire is an extension to the Firefox web brower that displays current propagation information by N0HR

FhG Software Radio - The Fraunhofer Software Radio is a first-class DRM reception system which provides audio and multimedia data content

The smk-1 on 20m - Taking the venerable SMK-1 design to 20m and adding an RF amp, audio filter, and a TiCK Keyer ... by Wayne McFee, NB6M

Broadband over power lines - PLT/PLC/BPL/DPL - it doesn't matter what you call it said one of our readers it has significant technical problems