Re: QCX20M #585 Transmitter Inoperative
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It might be interesting if someone would write a set of test programs that supported
individual function testing.? In this case the code would activate only CLK-2 on the
Si5351a and thus allow signal tracing to determine if the IC was bad, wiring was
bad, or configuration was bad, or possibly original software had a glitch and was
not activating CLK-2.?
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On Wed, Dec 6, 2017 at 2:42 PM, Dave Lear <de.ne5dl@...> wrote: I have built #585 and the receive section is working along with the display and the sub menu items. The rig aligned as per the manual. The keyer and side tone are working.
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However, the transmitter is not working. CLK0 and CLK1 are displaying quadrature wave forms. But here is no CLK2 output. I isolated IC1-pin 6 and still no output. So I decided to strip out IC1 and its associated components and substitute an Adafruit 5351 breakout board (didn’t realize that QRP Labs also has a similar breakout board). I changed the 27mHz crystal from the QCX to the Adafruit board in place of the 25mHz SMD Adafruit crystal.
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CLK0 and CLK1 are operative but still no CLK2. I disconnected pin 6 again and still no output. Since the same condition appeared in both approaches I’m suspecting IC3 may be faulty. I do have a second Adafruit board and could try the same procedure to see if an unconnected CLK2 pin would have an output.
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Any suggestions ?
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73, Dave NE5DL
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