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 tapped? It should do that. If it stays high for a while and then goes low, the problem has to be that the DAC2CS went low in the interim period. Failure of parts in any kit is a rare thing. Assembly problems are the usual cause of failures. 73, Don W3FPR On 7/8/2011 7:39 PM, R Thompson wrote: > 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. Pulses on pin 2, DIN, appear to be OK. VOUT on pin 7 > makes sharp transitions between the high and low states. Unfortunately > I was working with only one scope probe, I really wanted to see if there > was a second DAC2CS pulse on pin 3 that coincided with the undesired > toggle back to the high state (on VOUT), but failed to catch it. My > lunch time is too short, I used some of it to go over the Part II > alignment using the calibrated shop gear. > > At the moment, it appears to me that it may be software or digital > problem. The software level on my PIC is 2.04R. > > Any thoughts? Everything else in the part II alignment went well, no > problems, error codes, or other discrepancies of any kind, thankfully. > > Ron VE8RT > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
