This is pretty much a zero-effort-project if your digital interface is already installed! A number of mp3 files are included at the link to give some idea of how the Pro III behaves while transmitting in the AM mode with different EQ and compression settings. If you currently use your 756 Pro series rig for digital communications through one of the common computer interfaces, some easy improvements in AM performance can be made by using 'real-time' computer processed audio that is generated by the free Voice Shaper software and then ported out from the computer sound card into the audio port in the back of the Pro III. By suppressing the noise components, an outstanding Signalto- noise ratio is achieved, providing clear, clean audio in all modes without distortion of the target signal.Updated 6-26-2010: The link below has a few simple ideas about working around the aggressive ALC problem and the hard-coded DSP limitations of the 756 Pro III without any internal modifications to the rig itself.

The 32-bit DSP processing power produces real results by separating signal components from the noise with the variable Noise Reduction. The automatic notch tracks 2 or more interfering signals simultaneously without intended signal loss or distortion. Automatic notch functionĮliminate annoying AM carriers, amplifier or radio tune up interference with a push of a button. It is not necessary for you to prepare an external demodulator when you receive an RTTY message. The built-in RTTY demodulator and decoder allow you to check the callsign of the station instantly. The transmit memory is displayed on the screen so that you will not send the wrong message. You can edit up to 62 character pre-fixed messages for each memory channel without a PC or other external unit. The IC-756PROIII has 8 channels of RTTY transmit memory. With this flexibility of DSP based waveform shaping, transmit audio quality is adjustable depending on the operating situation. In addition, the SSB transmit bandwidth is selectable from 100, 300, 500Hz at the high-pass edge, and 2500, 2700, 2900Hz at the low-pass edge respectively.ģ types of high and low combinations can be stored in the memory. The built-in audio equaliser has separate bass and treble adjustment for a total of 121 combinations, so you can tone your voice up or down when you want. The 24- bit AD/DA converter has an ultra-wide dynamic range.Īlthough I have this nice Icom IC-756 digital radio within the shack, there are many times I still use my old, trusty Kenwood TS-850. This powerful combination supports many digital processing features exclusive to the IC-756PROIII, which cannot be achieved with traditional analog processors. The heart of the IC-756PROIII is the proven combination of the 32-bit floating point DSP and 24-bit AD/DA converters.

Icom 756 pro