haha wow I just did the doubles rather than doing all off the harmonics. Ok its time to go and get some sleep. The 3 hours I got last night were not enough.
~Brett On Sun, 2009-08-23 at 17:09 -0700, Brett Howard wrote: > Actually I believe that the signals will be plenty stable if you place > the hardware mod but don't change the frequency. However speeding > things up (using the SPI2 setting) w/o proper termination is going to > cause problems. > > I think the reason for the speeding up of the clock was to put the > harmonics out of the bands. The previous frequency was 1Mhz where as > with SPI2 its set to 4Mhz. That puts the harmonics at 4Mhz, 8Mhz, > 16Mhz, 32Mhz (and then we are out of the range of the rig). Notice that > none of these fall inside of Ham bands.. You'll also note that the > areas where you are told to look for the noise is at the even 1Mhz > multiples. > > The diode and R combo allows for the R's to only be in play when the > Chip Select for those particular components is activated (low). Its a > pretty darn slick idea. > > ~Brett (KC7OTG) > > On Sun, 2009-08-23 at 16:08 -0700, Ron D'Eau Claire wrote: > > Well, it shouldn't hurt to do the mod, but I agree with David if you can't > > find any noise. > > > > The reason 3.24 is required is that it provides a menu entry for changing > > the bus timing as described in the procedure. A slightly different timing is > > required for stable operation once the diodes and resistors are added. > > > > If you try to load the firmware and change timing without adding the > > resistors and diodes, or if you add the resistors and diodes and do not > > change the timing, the VFO may become unstable, making un-commanded QSYs. > > (On my K3 they were in 100 Hz steps.) > > > > The default timing in all the firmware, including 3.24 and up, is correct > > for K3's that do not have the diodes and resistors added, so you need do > > nothing after upgrading your firmware if you haven't added the parts. Your > > K3 will continue to work FB just as always. > > > > A revised mod procedure will be posted Monday to make that point clear. > > > > Ron AC7AC > > > > -----Original Message----- > > In a recent message, Roy Morris <[email protected]> wrote ... > > > > > >Now that my K3s have v. 3.25 firmware, > > ... > > > While I have access to the PCB, why not go ahead and install the VFO > > >tuning noise reduction mod even though I do not experience noise during > > >VFO rotation on 6, 10, and 60 meter bands. You might say "if it ain't > > >broke, don't fix it". > > > > The mod notes for the VFO Tuning Noise Reduction do say, in bold type.. > > > > "IMPORTANT: You must complete the modification as described below > > before using firmware version 3.24 or later. Failure to do so will > > result in erratic behavior of your K3." > > > > That seems to imply that even if you don't notice to be broke, it may > > be. > > > > 73 > ______________________________________________________________ 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
