Ron,
It is very difficult to detect a 2nd pulse on the DAC2CS signal with a
regular 'scope - a digital 'scope that is conditioned to trigger on
events where DAC2CS goes low is required to capture the culprit.
Did you confirm that U5 pin 7 goes to a high state and stays there when
BAND- is ta
Hi Don,
I took it in to work today, to use some of the test gear during my
lunch hour. U5 pin 3 (LD/CS) looks good. There is a steady high on
this pin (measurements made on the IC pins, not on the board, to rule
out soldering problems at the board) with good well shaped pulses
pulling it low
Ron,
Yes, the frequency should not revert to the high reading - it should stay.
Check the soldering at RF Board U5 carefully for solder bridges and also
J8 pins 15 and 16. Then on the control board check U6 pins 19 and 20 as
well as J8 pins 15 and 16. Make certain all those points are well
I'm doing the alignment at the end of part 2 of the assembly. So
far all seems to be well. There is a quirky little thing that I wanted
to ask about.
From page 63, PLL Reference Oscillator Range Test, step 3.
"When you're in frequency counter mode, the BAND+ and BAND- switches can
be
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