dc filter

Antennas for Weather Reports - Radio receivers and methods to improve reception of weather radio broadcasts

Three or four foot box loop - Plans to build a three or four foot box loop for the AM broadcast band, will tune from 530 to 1710 kHz.

The Radio History Society - A Washington DC-based non-profit organization dedicated to the preservation of radio and television history. We operate a museum in Bowie, MD

Radiophile.com - Wood and plastic broadcast radios from the 1930s and 1940s, lovingly described and profusely illustrated.

PE1PKU Peter - technics, radio astronomy, great links, duplex filter

EI4IX Dave - Dedicated to 50MHz and 144MHz. Online 2m and 6m logs. Real Audio sound clips of Tropo, Aurora, Sporadic E, Meteor Scatter, TEP and F2 Propagation.

Gisela Dierking NF/HF-Technik Germany - Many interessting accessories, like unversal audiofilter, Mixer interface for sound card, highvoltage powersupply,accessories for 706, hamradio vacation, and more

Transmitters 'R' Us - We are manufacturers and re-sellers of a wide range of AM, FM and Shortwave broadcast transmitters, kits and related products.

I5XWW Crispino Kits - Ham Radio Kits, soundcard interface for digimodes, usb CAT Interfaces, PA interface cables, connectors, DRM hardware and software, DRM converters

Soundcard Interfacing - This page is an attempt to correlate the interfacing schemes for various Radio models, and Sound Card configurations.

Yaesu 920 & SoundCard - This circuit provides an interface between the Yaesu 920 transceiver and IBM computer sound card which allows data transfer and control of PSK31, RTTY, KEYBOARD CW, and SSTV modes for Amateur Radio

Sunspot number forecast - Provisional international monthly mean sunspot number

Italian Broadcasting Corporation - Italian Broadcasting Corporation - IBC Radio, historical site.

Radio Enterprise - A little station in the Netherlands on sundays at 0800utc time broadcasting on freq 6275 am

Electronic DX Press - Founded in 1995, a Club with a worldwide membership, administered from Australia. Shortwave, digital broadcasting, Australian medium-wave and FM, equipment. E-mailed "World Broadcasting Magazine", messaging forums, regular radio programs, extensive resource library.

Shortwave Australia - "Australia's newest and friendly Club for shortwave listeners - broadcasting, utility, TV, VHF, ARO, clandestine. Free membership. On-line messaging - members across Australia. Weekly free magazine ""Australian SW News""."

MT63 Terminal - MT63 soundcard program for Windows by IZ8BLY

DSPFilter - MM Hamsoft  ^pop - Freeware DSP filter by JE3HHT

PathSim - PathSim is a Windows program that can be used to simulate radio propagation paths using a soundcard and/or wave files as the source and destination.

MMSSTV - MM Hamsoft  ^{updated  pop} - SSTV freeware software for Windows by Mako JE3HHT. An excellent SSTV program that requires only a computer with soundcard, no expensive TNC required. Works on all Windows version including Windows XP, Vista and Windows 7

Spectra - Accurate spectrum analyzer in the range 0 - 2500 Hz, makes an accurate FFT analysis of an audio signal coming from the soundcard

Fuse Those Batteries - The proper way to fuse the 12 VDC power cable between a battery and a mobile radio.

Mode J Desense Filter - This type of filter can be used in a Mode J satellite station (uplink on 2m, downlink on 70cm) to reduce the problem of the uplink signal desensing the receiver

7 MHz SSB Transceiver  ^pop - Circuit diagram and discription of 7 MHz Ham Radio SSB Transceiver. Transceiver using two MC1496, 4.43 MHz Ladder filter, LM386, LM324 and IRF840 in final.

PTT and Sound Card Interface - PTT and soundcard interface schematic by ON6MU