Garry, You don't need WWV to do the "N6KR" method - you can use any reference signal of known frequency and accuracy. Subtract the BFO frequency from the VFO frequency and that should be the frequency of your reference - if it is not, then adjust C22 until that condition is true.. With WWV (or any other signal on a xxx0.00 frequency), the math is easy and one needs only to match the 3 low order digits in the K2 display. Note - do not attempt to use 15 meters and above - the VFO and BFO are additive on those bands.
73, Don W3FPR 2rGarry wrote: > Thank you Don. I think the most confusing part of all was, I was > looking for various width settings for the ssb filters. Eventually I > came to realize that I had to use the other filters for reduced > bandwidth for ssb. After that dawned on me it was relatively easy. > Or perhaps I still have not got it correct. Still can't get the > display on frequency. I guess I need a decent freq counter. Can't > seem to manage with wwv. > > cheerio and 73. > > Garry > > On Thu, Feb 11, 2010 at 8:52 PM, Don Wilhelm-4 [via Elecraft] > <[email protected]> wrote: > >> Garry and all - at least those who are building new K2s. >> >> Yes, the filter setup is a bit "tricky", especially when using filter >> widths wider than 1.00 kHz. The reason is in the varactors that have >> shipped with the more recent K2 kits. What that means is that a filter >> width that is indicates as 2.00 kHz wide on the K2 may actually be 2.5 >> kHz wide (this is not exact, it all depends on the varactors). The >> result of this is that the LSB filter settings listed in the manual will >> be about right, but the USB settings will be way off. In other words, >> the manual settings will give you a workable filter for the lower >> sideband response, but will not work for the upper sideband (USB, RTTYr, >> and CWr) settings. (NOTE: the OP1 filter width is not affected by the >> varactors - there are no varactors on the KSB2 board). >> >> The only cure I know is to use Spectrogram or another audio spectrum >> analyzer to measure the actual width of the filter (in LSB or CW - not >> CWr - or RTTY - not RTTYr). When you use LSB, CW or RTTY, you should >> be on the lower sideband, and you can change the width without much >> movement of the lower end of the passband frequency. After getting the >> filer width as you like it, then refine the low frequency end of the >> lower sideband filter (by changing the BFO setting) and then set the USB >> BFOs to properly place the sideband. >> >> If you want specifics on how to set the filters, look at part 3 of the >> article on K2 Dial Calibration at my website www.w3fpr.com (while you >> are there, you may just want to go through the entire K2 Dial >> Calibration procedure which includes adusting the filters. >> I have not yet updated the webpage information to include how to handle >> this "varactor problem", but since you can see the passband width on the >> Spectrogram display, it should be obvious. Just adjust the width of the >> filter until the actual width is what you want, and use the K2 display >> only as a relative indicator. >> >> 73, >> Don W3FPR >> > ______________________________________________________________ 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
