[aprssig] Waveform (signal) on MX614 RXIN pin?
Ron Tonneson
ronton at southslope.net
Sun Jan 1 17:02:05 EST 2006
Jim,
Take a look at the block diagram on page 3 of <http://atic.phys.lsu.edu/aces/Docs/Component%20Docs/mx614.pdf>. Pin 5 is
the inverting input of an op-amp, pin 6 is it's output. That is the reason why I see very little voltage on pin 5.
Yes, the signal on pin 6 is out of phase with the input due to the input being on the inverting input of the op-amp.
Ron - K0QVF
James Washer wrote:
> One last question... do you have a dual trace scope? If so, are the signals on pins 5 and 6 out of phase by 180degrees? My belief is that the chip is (attempting to) scale the signal on pin 6 by feeding back a signal 180 out of phase. The resistor between 5/6 sets the bias, the cap controls the amplitude.. but I want to make sure this is the case.
>
> thanks
>
> - jim
>
> On Sun, 01 Jan 2006 07:24:19 -0600
> Ron Tonneson <ronton at southslope.net> wrote:
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