Problem solved -- I think.... I ended up doing a factory reset (power-up while pressing/holding Shift knob in until power up completed), EE INIT. And I just read through the rest of your note and now see that's what you suggested!
I then went through the entire setup process. What I did differently this time was during the reference oscillator calibration, I found that much less of an adjustment was needed than what I did before. In fact it was fine as-is. I'm not sure what prompted me to adjust the oscillator before (I used WWV as an on-air reference), but this time around, everything came out fine. I suspect my incorrect reference oscillator adjustment explains why all three filters appeared to have incorrect offsets. Now the only remaining problem is getting the rig to show S9 with a 50 uV source. The adjustment range doesn't go far enough to produce S9 on the display. I put a new battery in the XG2 signal source, same problem. I'm not too concerned about this one -- only mildly annoyed. This is a very minor problem compared to what I *thought* was wrong with my filters! Thanks for your detailed response -- appreciated. --Andrew, NV1B On Sat, Jul 9, 2011 at 12:33 AM, Matt Zilmer <[email protected]> wrote: > The chances of that are negligible. You should send your original > email and all follow-ups to [email protected]. > > I have heard of a lot of strange K3 symptoms, but this one is beyond > the pale. It sounds like one of the pre- or post-roofing filter > components is somehow shifting the resonance, and looking at the > schematic I just don't see how that's possible unless there is a > bypass-value in place of a regular cap. Conventional SMT assembly - > that would not happen. > > I'm no expert, but this probably is not some trouble that can be shot > over email. One of the Elecraft gang can help you narrow it down, but > it should probably be done interactively over the phone or Skype or > whatever. > > You *may* be able to avoid the additional hassle by running the EE > INIT procedure on your K3 and starting over. This will only work if > there isn't some defect in the hardware, but that is so unlikely that > running EE INIT is your best bet. See p66 of the Owner's Manual (rev > D7), or use Adobe to search for "Parameter Initialization". If you > dorked a setting, then EE INIT will solve that problem and put your K3 > into its factory default settings. > > Good Luck. No matter what you can or can't get done in short order, > Elecraft will assist you with any problem. > > 73, > > matt W6NIA > K3 #24 > > == > > > On Fri, 08 Jul 2011 23:40:40 -0400, you wrote: > > >Filter placements are correct, and no empty slots are enabled -- I've done > >the setup both ways: manually via CONFIG on the K3 itself, and via the K3 > >utility. Done it many times now. > > > >Here's the odd part: > > > >If I change the frequency offsets in the K3 (via CONFIG menu), I can dial > >across the range of value offsets and peak a signal almost to the point at > >which things sound like they're operating properly. Same thing happens > for > >3 of my filters -- the 2.7k, 400 Hz and 200 Hz. In all cases the > specified > >offset is not the one value that gives the strongest signal. Using the > >specified offsets, it seems like the signal is not properly centered in > the > >passband. > > > >What are the chances all three of my filters have the wrong offsets? > > Possible but doubtful. > > > >Is there some other setting on the K3 that I may have inadvertently > tweaked > >during calibration that would have thrown off all filters? > > > >I'm stumped. > > > >--Andrew, NV1B > >.. > > > > > > > > > > > >On Fri, Jul 8, 2011 at 9:35 PM, Guy Olinger K2AV <[email protected] > >wrote: > > > >> The most likely cause of your problem is that the filter placements as > >> viewed in the K3 utility and as actually installed on the main board > >> do not actually match. Next is that you have left an empty slot > >> ENABLED in the K3 utility. After that, a filter not plugged all the > >> way in or defective. > >> > >> 73, Guy. > >> > >> On Fri, Jul 8, 2011 at 8:06 PM, Andrew Moore <[email protected]> > >> wrote: > >> > New K3 with 3 filters: > >> > > >> > FL1 - empty > >> > FL2 - 2700 Hz > >> > FL3 - empty > >> > FL4 - 400 Hz > >> > FL5 - 200 Hz > >> > > >> > FL2,4,5 enabled, offsets and bandwidths entered, and filters plugged > into > >> > right slots (FL1 can remain empty right?) > >> > > >> > When I turn the bandwidth encoder CCW, everything's fine until I hit > 400 > >> Hz. > >> > At 450, I hear signal. At 400, when FL4 kicks in, receiver goes quiet > >> from > >> > then on. > >> > > >> > Ideas? > >> > > >> > Also - RF calibration - I'm using an XG2 to feed the K3 a 50 uV > signal. > >> The > >> > K3 hears it at about S5 max, not even close to S9. Followed the > >> calibration > >> > instructions. > >> > > >> > --Andrew, NV1B > >> > .. > >> > ______________________________________________________________ > >> > 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 > >> > > >> > >______________________________________________________________ > >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 > ______________________________________________________________ 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
