17853No RX image rejection
- Jan 21, 2008On pin 1 (top left of U8) I have 4.9 volts! :(
and on pen seven I have 2.48 volts :)
I am testing things out now and had to pull this thread and info out
of another topic....
Tony does this mean that U8 needs to be replaced?
I see the same things on both sides.
> No RX image rejection results when one of the I / Q signals from theRXTX board is not getting to the stereo soundcard line-in input. The
problem could be on the RXTX board, in the cable or at the soundcard.
Also, if I and Q signal lines are shorted together no image rejection
will be the result.
>output signals were connected to a soundcard when an AC voltage
> There have been a few cases of U8 failing when the RXTX board I / Q
difference existed between the soundcard ground and the ground on the
RXTX board. Please check the DC voltages at pins 1 and 7 of U8 to see
if the two pins are still at about 2.5 volts with reference to circuit >
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