RadioBanter - View Single Post

March 1st 04, 06:05 PM

wrote:
My own understanding of a digital radio - only the keypad and the
frequency display is digital and all the rest is analog . Pl. correct
me if I am wrong .

In general, true.

There is usually also a digital processor which handles selection of
modes (AM, FM, SSB, etc.) and often allows remote control from a computer.

Some radios do now have digital signal processing circuits, which accept
an intermediate frequency signal and filter out unwanted noises and
stations.

I suppose it would be possible to build an almost-all-digital radio.
The audio output circuits are inherently analog (though with a power D/A
converter you could have just a few resistors on the analog side).
You'd also need an analog amplifier to bring signals from the antenna up
to the point where an A/D converter could operate on them.

With current technology it's not economically practical to do it that way.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com