Thanks Don, but I have already done these checks and mentioned the results in my first post on this list.
73, Bogdan YO8SAW > On 28 Nov 2016, at 02:32, Don Wilhelm <[email protected]> wrote: > > Bogdan, > > I just returned from Thanksgiving holiday/vacation and saw your post. > > The indication of "---" in the menu entry indicates that the 6R/AUX signal > line is not allowing the KNB1 firmware to communicate with the K1 main MCU. > > I would suggest you check the soldering of RF Board J1 pin 2 and also pin 2 > of the mating connector on the KNB1 board. > > Also check to be certain KNB1 R1 is 180 ohms and is inserted into the correct > lead holes and well soldered. > > You could try a continuity check between Front Panel J1 pin 8 and the KNB1 U1 > pins 3 and 4 - the resistance should be 180 ohms if all is well. > > Double check the orientation of KNB1 U1 - the label used often covers the > device notch on those 8 pin firmware packages making it easy to insert > backwards. > > The trimmer on the KNB1 board will work whether or not the KNB1 firmware is > working. > > 73, > Don W3FPR > > On 11/26/2016 5:53 PM, Bogdan - Constantin Lazanu wrote: >> Hello, >> >> This is my first message to this mailing list, so please be gentle! >> >> During the summer and autumn I built my first ever kit: the K1-2 (#3449) + >> KAT1. Everything worked surprisingly well (being a first-timer and all), I >> never had any problems. Until now. It seems that I failed in my >> “build-without-help” venture :) >> >> A few days ago I completed building the KNB1 option and when I got to the >> “Initial Test” phase I noticed that in the menu, instead of HI/LO/OFF I can >> only see three dashes (---). The instructions say that the K1 firmware has >> not detected the noise blanker module and that a possible cause may be that >> the U3 was soldered in backwards. I assume that’s a mistake - there is no >> U3. Just a U1, and it’s soldered properly. >> >> Some details: >> >> - The K1 firmware is revision 109 >> - The KNB1 PCB is revision Cr >> - U1 on KNB1 has a small paper label with “NB 1.02” written on it >> - Turning the trimmer C2 on KNB1 does vary the band noise and received >> signal strength >> - There is continuity from KNB1 U1 pins 3/4 to the front panel U1 pin 8 >> (6R/AUX) - around 182 ohms >> - The voltage between KNB1 U1 pin 1 (VDD) and GND is 6.03V >> - The voltage between KNB1 U1 pin 5 and GND is 5.59V (this is the 6V switch >> for the noise blanker) >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
