emi filter

144 MHz 5/8 whip antenna - Making your own 2 metre (146 MHz) 5/8th wave whip antenna

LOTW users online DX cluster - DX Cluster filtered with only Log of The World users

KL7RRC NA-235 DXpedition - Chirikof Island DXpedition IOTA NA-235 Semidi Islands Group

5V7TT Togo 2010 - Togo DXpedition 5V7TT 10th-23rd October 2010

AG6AU El Dorado County Amateur Radio Club - The premier amateur radio club in El Dorado County, California representing a wide cross section of Amateur Radio Operators.

Amateur Radio Exam Study Materials  ^updated - Collection of several documents to help you study for your Amateur Radio license exam at W5JCK

Digital Modes Samples - Audio recording of many ham radio digital modes emissions. Sound samples of HF VHF digital signals samples and published by KB9UKD

Eagle 1st - US made, accessories for the RF laboratory; including Return Loss Bridges, high performance coaxial cable assemblies and test filters.

AC0C Roofing Filters - Yaesu FT-2000 roofing filters

Hittite Microwave Corporation - Amplifiers, filters, attenuators, mixers, PLL, switches and frequency dividers, signal generators, power detectors, transimpedance amplifiers, variable gain amplifiers and more

Cobham Microwave Priority listing - Cobham Microwave has a long term experience in Microwave Systems and Components. Their five areas of capabilities are Systems and Components: Diodes & Modules, Ferrite Devices, RF Filters, and Waveguides.

digitalvoice Group - Digital voice on Amateur Radio - devoted to the discussion of digitized voice and data over analog emission modes.

Digital Radio Mondiale - About DRM, the DRM standard, emission types, upfrading your old HF RX to DRM

Audio CW Filter - A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ

Making the Most of your PSK31 Signal - Adjusting audio output of your soundcard to obtain a perfect PSK signal from your transmission. A project to help you tuning your PSK31 emission.

TS-870S 4Khz Filter Modification - The TS-870 has a 3KC stock filter, swaping out this filter for the Inrad 4KC filter result better sensitivity on receive

Gagacom - Amateur radio accessories dealer based in Wehrheim Germany, offer Antennas, baluns, filters, antenna tuners, dummy loads, swr wattmeters by Palstar

ASAP Electronic Component Distributors - ASAP Semiconductor is a premier source for all long lead-time, hard to find, and obsolete components.

IDSP - IDSP is an app for IPHONE and IPOD Touch. Made by 2 powerful filters, a band pass and a band stop with adjustable bandwidth. Filters are butterworth 4 and 8 poles, sample rate at 44,100 32 bit. Cancel every noise and hear only your qso.

AktivFilter - Active filter design software for windows, AktivFilter 3 for the design of active filters tuned on the opamp type.

SK6AW iPhone DX-Cluster - Android & iPhone DX-Cluster, works well in most browser. Supports iPhone push notifications via pushme.to and E-Mails. Spot filtering and skins available. Very flexible.

50 MHz Power Amplifier - Home-brew 50 MHz Power Amplifier by UN8GC

National Semiconductor - National Semiconductor Corporation, component database

1.5KW 6m Low Pass Filter - This filter is designed to follow a FULL legal limit, GS-35B, 6m linear amplifier. Designed and built by Bill Jones, K8CU

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