QEX

Converter filter is centered at 500 Hz and sounds like a rapid, smooth and steady hooting. The receiver downconverts its audio input to a pair of baseband channels in quadrature, passes both signals through a 10-pole linear-phase active low-pass filter, then through digitally gain-controlled dc amplifiers, and finally to 8-bit A D converters. With this arrangement, AGC range is about 90 dB, but distortion in the audio output stage of the radio makes only about 60 dB of it usable. The audio...

The Cloverleaf Performance Oriented HF Data Communication System

Petit, W7GHM PO Box 51 News Item in March of 1990, AK0X and W7GHM conducted a series of on-the-air tests of a new HF data communication system design over the 1500-mile path between Boulder, Colorado, and Oak Harbor, Washington. On five different days, and on the 80, 40, 30, and 15-meter bands, Ed sent text from Isaiah 55 to Ray, W7GHM, at higher speeds than any other data mode was capable in the same band conditions, and Ed's Cloverleaf signal was so compact that twenty of them...

North East Digital Association Filling A Need

The North East Digital Association NEDA was formed to support packet-radio networking in the northeast. The association's main purpose is to maintain a reliable inter intra-state packet network that is useful to Amateur Radio operators for emergencies, education and the fun of the hobby. Currently, NEDA's network extends throughout central New England and New York State. NEDA is a member-supported organization. Members are those hams who feel that the cause of packet-radio networking is worth...

Authorized

Mobile, 205-476-4100 Arizona Ham Radio Outlet Phoenix, 602-243-3515 Ham Radio Outlet Anaheim, 800-854-6046 Ham Radio Outlet Burlingame, 415-342-5757 Ham Radio Outlet Oakland, 415-451-5757 Ham Radio Outlet San Diego, 619-560-4900 Ham Radio Outlet Van Nuys, 818-988-2212 The Radio Place Sacramento, 916-441-7388 Delaware Amateur Supply New Castle, 800-441-7008 Amateur Electronics Supply Clearwater, 813-461-4267 Florida cont. Amateur Electronic Supply Orlando,800-432-9424 in...

To fill all your data communications needs

It Incorporates a packet controller with a 40 column thermal printer that operates on 13.6 VDC and interfaces with any mobile radio. In a recent user test it proved to have about twice as much audio level range tolerance as other TNCs. It is also an ideal unit for emergency work and a commercial version is perfect for dispatching service, emergency and police vehicles. The exciting FSTV-430 fast scan television transceiver makes getting on ATV easy and...