Hey OM:

In the ole NTSC days gone bye, that's how they detected the video
signal in the last of the ole NTSC TV's, took the SAW filtered IF and
squeezed the video out by converting the RF right to video baseband,
with the carrier as an LO OSC all inside one little tiny IC

I just never new what happened to the frequencies that were below ZERO
from the mixer.

73 OM
de n8zu


On Jul 11, 11:50 am, "amdx" wrote:
In a direct conversion receiver, does the osc. run at
exactly the same frequency as the received signal?

Assuming the answer is yes;
Is it possible to have a high Q LC front end at the output from the
antenna,
split the signal and feed one output to the rf input of the mixer and feed
the other splitter output to an amplifier and use the amplified signal to
drive the osc input of the mixer?

Simple block diagram of proposed idea;http://i395.photobucket.com/albums/p...conversion.jpg

--
MikeK