[ICOM] Re:ICOM] TX audio on 775

[Adam Farson]

Hi Clete,

Correction...it is not a compandor; it is a compressor. There is no
complementary expansion function in the receiver.

In the IC-775 series, the compressor is an analogue circuit in the 455 kHz
TX IF chain. In the newer IF-DSP-based Icom transceivers (IC-756Pro series,
IC-7800, IC-746Pro, IC-7000) it is a process in the DSP algorithm. 

I remember the old echo suppressors from my years in the telecom industry.
They were analogue, and DSP-based adaptive echo cancellers replaced them.

There is a general article on compression on my website.

http://www.ab4oj.com/icom/ssbcomp.html

Cheers for now, 73,
Adam VA7OJ/AB4OJ



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