--- In [email protected], "Jim Miller" <[EMAIL PROTECTED]> wrote: > > In the context of direct conversion, single image receivers, is the concept > of CW reverse meaningful? > > Assuming the image rejection is 40-50db I can't see what it buys. > > Any comments welcomed. > > 73 > > jim ab3cv (slightly confused...)
Jim, it is not only a matter of image rejection... suppose you are listening in a BW of 500 Hz with a CW pitch set to 700 Hz. What you effectively hear is the range 700 - 250 = 450 Hz to 700 + 250 = 950 Hz. If there is interfering tone at 900 Hz, if you reverse the position of the LO with respect to the wanted signal, now that interfering tone will be at 500 Hz, which may or may not be of less disturbance to the listener's ears, depending on the personal preferences, the frequency response of the headset/speaker used, etc. 73 Alberto I2PHD
