cw filter

CWS Coil Winding Specialist - Manufacturer of transformers, inductors coils and chokes. Custom winding, EMI / RFI Filters, Antenna Windings on ferrite rod, Antenna Winding on phenolic. Any antenna coil designs.

MFJ Enterprises  ^pop - MFJ manufacturer of ham radio antenna products, antenna tuners, antenna analyzers, morse code & CW, SWR wattmeters, antenna accessories , power supplies, audio filters, TVI filters, baluns, coax switches and more

Idiom Press - CW keyers, Logikey, and antenna rotator controll like rotor-ez, and active audio low pass filters.

CW Command Post - Replace four separate accessories keyer, keyermemory, audio filter, and audio amplifier-- with one box containing allfour and providing for multiple inputs and outputs. N1FN CW CommandPost A not very original CW operating accessory "put together" by N1FN

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

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

Yaesu FT-920 Inrad CW Filter Mod - This modification allows the use of two filters. Either one or two filters in cascade may be selected

Yaesu FT-920 Narrow filters mod - CW and SSB INRAD narrow filters modification

GES Electronics - Ham rasio shop in Chzeck republic, offer antennas, filters, roators, electronic components, cw keyers, power supplies, and other ham shack accessories

Wadsworth Repeaters - The GE Master Exec II receiver employs a five cavity helical input filter to insure out of band rejection.

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

Spectrum Lab  ^pop - DL4YHF's Audio Spectrum Analyser Spectrum Lab or Speclab started as a simple FFT program running under DOS a long time ago, but it is now a specialized audio analyzer, filter, frequency converter, hum filter, data logger and more. Can be used for MTHELL QRSS, DFCW, PSK, MSK, Castle

MultiPSK  ^pop - Windows freeware miltimode program by F6CTE that supports BPSK31 QPSK31 PSK63 PSK63F PSK10 PSKFEC31 PSKAM CW CCW THROB 4 bauds THROBX RTTY SITOR-AMTOR-NAVTEX FELD HELL PSK JT65 HELL HF FAX SSTV FILTERS

CwGet  ^{updated  pop} Priority listing - A program to decode morse code (CW) via sound card to text. It can work as narrow-band sound DSP-filter also. No additional hardware required — you need only receiver and computer with a sound card. Can integrate with AALog logger.

SSB and CW Filter - A pdf file with schematics of an ssb and cw filter AF amplifier

Variable bandwidth cw filter - As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception

Homebrew a CW Filter - An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.

Passive CW headphone filter  ^updated - This filter is a plug in adapter that has no batteries but gives very good performance by G8MNY

TVI Filters - Schematic and diagrams for TVI Filters by G4WPW

CW Filter - I0QM Gaussian CW Filter page This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993

The Rock-Mite CW Kit - The Rock-Mite is a 40m CW kit offered by Small Wonder Labs . It features built-in keyer, direct conversion receiver with a crystal RF bandpass filter, 500 milliwatts of power, and switchable frequency offsets to work around QRM

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

Kenwood-to-PC Serial Interface - A circuit that connects an IBM® compatible personal computer, running TR Log or CT (etc.) contest logging software, and Kenwood transceivers equipped with serial control ports. CW keying is also provided in this RFI filtered interface unit.

Crystal tester - Crystal tester project, crystals are used to control the operating frequency of transmitters, and it is used in radio frequency converters, oscillators, filters for cw, ssb and many other applications.