digital voice

K4HY Owensboro Amateur Radio Club - The Voice for Amateur Radio in Daviess County for 53 Years

HamRadio-DV - Digital voice amateur radio association

Elenco Electronics - Test equipment maker, digital oscilloscopes, generators and counters, multimeters, logic probes testers and more

ExTech - Electronic test and measurement; digital multimeters, clamp-ons, portable printers, meters and dataloggers.

Keithley Instruments Inc. - Digital multimeters, power supplies, frequency counters, RF analyzers, signal generators

EADS North America Defense Test - Digital multimeters and frequency counters.

Victor Electronics - Accredited oscilloscope manufacturer for over 20 years produce digital oscilloscope, multimeters, frequency counters

IWATSU - Test instruments corporation produces digital multimeters, Oscilloscopes, signal generators, universal counters

Tenma - Cable testers, counters probes multimeters and digital oscilloscopes

Deree Electrical - Specialized in manufacturing measurement instruments for more than 25 years. Clamp meter, digital multimeter, analog panel meter, thermometer, and led panel meter

Precision Mastech Enterprises - Established in 1987 in manufacturing analogue and digital multi-meters and various testing instruments.

Fieldpiece Instruments - Heavy duty digital multimeters

Signametrics - Digital Multimeters - Signametrics corporation, manufacturer of precision digital multimeters, lcr meters, and switching cards for pci and pxi chassis

Link Instruments - Pc based test and measurement equipment and instrumentation: digital oscilloscope, logic analyzer and spectrum analyzer.

Yokogawa - Maker of optical spectrum analyzers, digital oscilloscope, digital power meters and more test equipmente related products

Signatec - Signatec manufactures pc based data acquisition waveform digitizers pci daq boards, digital signal processing pci dsp boards, waveform signal generator pci dac boards, and real time waveform recording products for the signal technology market.

Signal Forge - The signal forge 1000 signal generator is a portable, high-performance digital and rf signal source with a 1 ghz frequency range. features include digital, differential and ac coupled outputs

BK Precision - Power supplies, electrical testers, battery analyzers, cable tester, rf generators, spectrum analyzers, Digital/Analog Oscilloscopes, Multimeters , attenuators, frequency counter

Digital modes Babel Tower - A review of ham radio digital modes with watefall differences between PSK RTTY Hellschreiber MFSK Olivia JT65A and digital voice by HB9TPL

K4JCW - Hellschreiber Resources

Electro-Meters - Dealer of digital and analog panel meters Products include portable test equipment, oscilloscopes, recorders and temperature sensing equipment

Omicron filter design - Electronic filter design software by omicron is the best for developing active filter, passive filter, and digital filter - check out our products and ordering information.

Voice Keyer - The Voice Keyer is a free Windows based voice keyer. It is very easy to use and it handles up to seven messages. By connecting your computer soundcard to your radio it's possible to just press a button and the computer will CQ for you, to spare your voice. It can also PTT your radio via the LPT port by SM3WMV

Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength

Interactive Digital Filter Design - This is an interactive filter design package, for designing digital filters