Don, The effect happens when the antenna is disconnected as well as when connected. And in SBB and CW
SSB Filter Widths X1 = OP1 X2 = 2.4 X3 = 2.1 X4 = 1.8 CW Filter Widths X1 = OP1 X2 = 0.7 X3 = 0.4 X4 = 0.1 I assume something is going wrong in the 4.915MHz Variable Bandwidth Crystal Filter. Mike On 03-Jun-12 5:44 AM, Don Wilhelm wrote: > Mike, > > Yes, I would say that you have a significant difference there and it > indicates a problem of one nature or another. > What mode? > How did you set up the IF filters? Use Spectrogram. Look at my > website www.w3fpr.com article on K2 Dial Calibration - Part 3 deals > with the filter setup. > The reason I suspect the filter is that the XFIL 1 is a wide filter, > and if you did not offset the passband from zero frequency you will > have the BFO energy appearing in the output and that will influence > the S-meter response. > > 73, > Don W3FPR > > On 6/2/2012 3:31 PM, VK1OO wrote: >> Don, >> >> Nice to hear from you again. >> I had a similar thought from Jim, W4ATK. >> I'm surprised the S-Meter is showing an additional 6 bars on X1. As >> I'm listening to a quiet frequency I am assuming that's all >> additional noise. Further that that is much more than seems justified >> by the relatively difference in bandwidth. >> >> I'm happy to simplify the question to, Why would the S Meter be >> showing that much difference? >> >> Mike >> VK1OO >> >> On 03-Jun-12 1:16 AM, Don Wilhelm wrote: >>> Mike, >>> >>> I can't tell from your post just how much increase in noise you are >>> hearing. >>> There will be an increase in the total noise heard just because the >>> bandwidth is increased - you will hear the total noise in the >>> passband, and when the passband is widened, the total noise will >>> increase. >>> >>> OTOH, if the increase is extreme, that would indicate a problem. >>> >>> 73, >>> Don W3FPR >>> >>> On 6/2/2012 6:02 AM, VK1OO wrote: >>>> Hi, >>>> >>>> Another interesting problem with the K2. I've noticed that when >>>> switching between the KSB2 filters, X1-X4, that there seems to be more >>>> background noise on X1. And there is a similar increase in S meter >>>> bars. >>>> On a quiet frequency with X1 selected, the S meter shows S8; X2-X4 >>>> show S2. >>>> I'd certainly appreciate any suggestions about where to start >>>> troubleshooting this one. >>>> >>>> >>> >> > ______________________________________________________________ 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
