#DM780 USB AUDIO OVERLOAD PLUS#
#DM780 USB AUDIO OVERLOAD SERIES#

#DM780 USB AUDIO OVERLOAD SERIES#

The standard Olivia formats (shown as the number of tones/bandwidth in Hz) are 8/250, 8/500, 16/500, 8/1000, 16/1000, and 32/1000. Some even use 16/2000 for series emergency communication.

Below the two other Olivia QSOs are PSK31 QSOs. There are two other Olivia QSOs just below our frequency. Here is a demonstration of a two-way transmission using the Olivia digital mode on shortwave. Olivia is useful for emergency communications, unlike JT65A or the newly popular FT8. Olivia is even capable when the signal is affected by auroral conditions (including the Sporadic-E Auroral Mode, where signals are refracted off of the highly-energized E-region in which the Aurora is active).Ĭurrently, the only other digital modes that match or exceed Olivia in their sensitivity are some of the modes designed by Joe Taylor as implemented in the WSJT programs, including FT8, JT65A, and JT65-HF–each of which are certainly limited in usage and definitely not able to provide true conversation capabilities. Olivia decodes well under other conditions that are a complex mix of atmospheric noise, signal fading (QSB), interference (QRM), polar flutter caused by a radio signal traversing a polar path. That means that Olivia is decoded when the amplitude of the noise is slightly over three times that of the digital signal! The Olivia-modulated radio signals are decoded even when it is ten to fourteen dB below the noise floor.

#DM780 USB AUDIO OVERLOAD PLUS#

By difficult, we are talking significant phase distortions and low signal-to-noise ratios (SNR) plus multipath propagation effects. In 2005, SP9VRC, Pawel Jalocha, released to the world a mode that he developed starting in 2003 to overcome difficult radio signal propagation conditions on the shortwave (high-frequency, or HF) bands. Ham radio is the oldest electronic social networking infrastructure. One such mode is known as Olivia and this mode offers keyboard-to-keyboard chatting for when you want to relax, and maybe make a friend. Unlike those modes that allow you to make quick work of getting DX stations into your logbook, simply by exchanging callsigns, a signal report, and a grid square, there are other modes that offer keyboard-to-keyboard conversational QSO opportunities. For those of you who have dived into the crowded but fun pool of FT8 operation or one of the other Joe Taylor modes (such as JT65 or JT9) and are excited now about digital modes, here’s something you might enjoy, too.

Dm780 usb audio overload