That's it! Thanks. Really works good. 73,
Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org On 12/5/2010 8:26 PM, Gary wrote: > Not sure but I think you're referring to the thread a couple days ago > entitled "determining zero-beat" started by Pete, N4ZR on December 3rd. Guy, > K2AV supplied the following instructions; > > "-----Original Message----- > From: Guy Olinger K2AV > Sent: Friday, December 03, 2010 5:38 AM > Subject: Re: [Elecraft] Determining zero-beat > > Set mode to CW. Set width to 200 Hz. Do a HOLD on MON. Set level to > 20-25. Tap MON to turn off beat. Tune to 10.000.000. Tap SPOT. > Should hear a beat, albeit a slow one. Advance or retard AF gain to > get the obvious beat. In CONFIG: go to REF CAL. This will have turned > off SPOT. Tap it again. Adjust VFO A to get slowest beat. > > With some patience and careful listening this is usually clearly a > specific setting, in my case 49.379.737. You will find that the beat > frequency wavers around due to changing propagation path length so you > have to listen for a while. Having accounted for the variation in > propagation it is quite clear in my case, albeit subtle, that 738 is > too high, and 736 is too low. It is also more clearly heard at some > times of day on a given frequency than others. There are also times > where there is a fast QSB on the signal that can be confusing and you > may just have to wait until the signal steadies. When you have it > spot on, there will be periods of several seconds or more where the > beat does not vary, something which does not happen nearly as much up > or down one Hz on the REF CAL frequency. > > After this adjustment it is clear that my K3 is within +/- 0.5 Hz at > 10.000000 MHz with no drift, probably within +/- 0.2 Hz though I won't > claim that. I have the KTCXO3-1 option in mine. It may be that a K3 > without it may be a bit more cranky, I would imagine so, but I'm not > pulling it out to see :>) > > 0.5 Hz at 10 will be less than 2.5 Hz at 50, though I don't know the > formula. It's not a straight multiply because of the conversion > scheme. With this adjustment in the menu, the chief contribution of > the KTCXO3-1 is no drift, not an absolute accuracy. > > My K3 is way more accurate than they spec, and accurate enough to show > up the propagational variations in the WWV frequencies. I would think > that if you have left it on for a while, and calibrate it before an > "exercise", you can count on it for spot on. > 73, Guy." > > And Bill, W5WVO offered the following supplemental help; > -----Original Message----- > From: Bill VanAlstyne W5WVO > Sent: Friday, December 03, 2010 5:49 AM > Subject: Re: [Elecraft] Determining zero-beat > > Just one caveat on this procedure (thanks Guy!) -- make sure you have CWT > turned OFF; otherwise, SPOT will not do what you want it to. (It will > attempt to retune the VFO.) > Bill W5WVO > > Gary > N6LRV > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Fred Jensen > Sent: Sunday, December 05, 2010 7:34 PM > To: Elecraft Reflector > Subject: Re: [Elecraft] K3 Calibration > > OK Folks, > > Last year, during a snowstorm when the static was unbearable on the > radio, I decided to "tidy up the computer." The result was I formed a > "New Rule," don't save stuff you print. I pasted this down into my > engineering notebook, but I no longer have it on this computer. > Sometimes, "tidy" sucks. > > The best thing would be for whomever posted this wisdom step up and > repost it, no doubt he has not done the "tidy job" on his machine. > > > > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1170 / Virus Database: 426/3300 - Release Date: 12/06/10 > > ______________________________________________________________ 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
