dc filter

DCI Digital Communications - Band pass filters, for radio frequency interference problems.

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

Kiwa Electronics - Kiwa Electronics is a company that specializes in accessory equipment for the radio enthusiast. Our products include Filter Modules to improve receiver performance, a High Performance Medium Wave Air Core Loop Antenna for improved broadcast band reception, the Pocket Loop Antenna, the Earth Monitor, BCB Rejection Filter and Broadband and SW Preamps. We also offer numerous performance upgrades for popular receivers.

I0JXX - The I0JXX is an italian company that offers market their projects, also sells electronic products of high quality, both for Ham, both Broadcast and their accessories. VHF Antennas, mosfet power amplifiers, filters, insulators, power dividers, telescopic poles, antenna masts

Array Solutions - WX0B - Stacking and phasing HF and 6m arrays antenna switches and contesting devices. Custom low band antenna arrays, bandpass filters,commercial/Mil STd filters,microwave components, commercial broadcast filters.

Kathrein Inc - Manufacturer of professional antenna and filter systems for communications and broadcasting, serving commercial and governmental markets worldwide.

PAR Electronics Inc. - Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave. Antenna for amateur radio bands

HD Communications - Rf Connectors,RF Amplifiers,RF Filters,HF cable and accesories. Tower hardware valves and tubes

Filter Concepts - Custom EMI Filters, AC DC Three phase filters by Filter Concepts Inc.

Martek Power - Martek Power designs and manufactures a wide of high performance power supplies for various industries. Power supplies AC-DC, DC-AC inverters, DC-DC, EMI Filters

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

Radius Power - DC Filters - DC filters from radius power are specifically optimized for applications with DC supply like e.g. photovoltaic inverters. Radius Power provides total power solutions, EMI filters solutions from design to manufacturing, Three Phase, Single Phase, Power Line, IEC inlet, Power entry modules Filters.

EchoFilter - EchoFilter uses the soundcard of a PC to process income audio signals in real-time. The narrow filter bandwidth allow the extraction signals and sounds from the audio signal that may normally be close to inaudible. It is intended for radio HAMS, hobbyists, researchers, scientists and students in the DSP field.

1.8-54 Mhz Low pass filter - An easy to make HF low pass filter form high power by k8cu

5th order High Pass VHF Filter - Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem

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

20m CW QRP Transceiver - The direct-conversion receiver uses an audio-based automatic gain control, an LC tone filter, and a 100-kHz crystal for frequency alignment. The same VFO is used for transmitting and receiving by DC1YB