S-meter calibration
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Dear Wayne,
I was also puzzled by this. After I finished the RX gain calibration on the main receiver (no sub-receiver installed), the XG-2 at 50 uV showed S8. Maybe the "finish" page in the K3 Utility RX calibration routine should say what the user should do now: Which CONFIG items to adjust and, if any, which ones NOT to adjust. BTW, what should the CONFIG:SMTR MD be set to during this calibration? NOR or ABS? Or does it matter? 73, Oliver Johns W6ODJ On 7 Oct 2009, at 1:13 PM, Wayne Burdick wrote: > Mike, > > Now that you've done rf gain cal, you'll still need to adjust SMTR OF > & SC so that you get S9 with 50 uV and S2-3 with 1 uV. RF gain cal > linearizes the dsp's internal representation, while SMTR OF & SC set > the actual meter indication. > > Try the factory defaults first. > > 73, > Wayne > > ---- > http://www.elecraft.com > > On Oct 7, 2009, at 10:59 AM, "Mike Harris" <[hidden email]> > wrote: > >> G'day, >> >> My results are: >> >> Source - XG1, RX gain calibration per the utility routine: >> >> Subsequently: >> >> Main RX only, pre amp OFF - 50uV (S9), 1uV (S2) >> >> Sub-RX ON therefore splitter loss: >> >> Main RX S8 & S1 >> Sub-RX S7 & S0 >> >> No big deal but not identical. >> >> As a matter of interest, the S-meter on the main RX had been set up >> a year ago or more as above. When I checked it before doing the RX >> gain calibration I discovered that the 1uV and 50uV figures were S5 >> & S9. Little wonder I thought the local noise level had been >> creeping up! Maybe after playing with the AGC parameters a re-cal >> of the S-meter is required, maybe not, but something altered it. I >> assume that given the 50uV S9 setting was correct then it isn't >> associated with the XG1. >> >> Regards, >> >> Mike VP8NO >> >> >> ----- Original Message ----- >> From: "Ken K3IU" <[hidden email]> >> To: "N1JM" <[hidden email]> >> Cc: <[hidden email]> >> Sent: Wednesday, October 07, 2009 12:22 PM >> Subject: Re: [Elecraft] [K3] Sub RX S-meter cal >> >> >>> The S-meter Cal procedure in the manual worked up until about >>> v.3.15 or >>> so. Now I am pretty sure that it was NOT separately adjusting the >>> SubRx >>> S-meter, but I never checked, so I'm not sure. It doesn't really >>> matter now. >>> >>> I have determined that, at least on my K3 (#202) running v3.41 et >>> al, >>> after running the RF Gain Calibration procedure and setting the >>> MAIN Rx >>> S-meter, the Sub Rx S-meter is spot on. It actually follows the >>> adjustment for the Main Rx S-meter, i.e., set Main Rx at an >>> extreme and >>> the Sub Rx shows the exact same extreme. >>> >>> So... it looks to me like there is no reason to have a separate >>> adjustment for the SubRx S-meter. I'm sure the manual will catch >>> up. >>> >>> 73, >>> Ken K3IU >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> 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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Turn the RF gain full cw and see if the S Meter is acting normal.
Dan AB3EN |
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In reply to this post by W6ODJ
We're going to add a final instruction to K3 Utility explaining that
SMTR OF and SC must be adjusted after running RF GAIN calibration. I suggest doing this with SMTR MD = ABS, preamp ON. Under these conditions you should be able to set SMTR OF and SC such that 50 uV produces an S9 reading, and 1 uV results in S2 to S3. Having verified this, you can if desired set SMTR MD to ABS, which is independent of the preamp and attenuator settings. The OF and SC values may need further tweaking in this case. Regarding SMTR MD: It can be set to either ABS or NOR at the time the RF GAIN cal procedure is run. The menu S-meter settings have no bearing on the DSP's internal calibration process. They are only used to set up the S-meter readings per the user's preference. I'm verifying this with Lyle and will get back to you if I'm wrong :) Lyle is on vacation and a bit hard to ready. 73, Wayne N6KR On Oct 7, 2009, at 1:51 PM, O. Johns wrote: > Dear Wayne, > > I was also puzzled by this. After I finished the RX gain calibration > on the main receiver (no sub-receiver installed), the XG-2 at 50 uV > showed S8. Maybe the "finish" page in the K3 Utility RX calibration > routine should say what the user should do now: Which CONFIG items to > adjust and, if any, which ones NOT to adjust. > > BTW, what should the CONFIG:SMTR MD be set to during this > calibration? NOR or ABS? Or does it matter? > > 73, > Oliver Johns > W6ODJ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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> I'm verifying this with Lyle and will get back to you if I'm wrong :)
> Lyle is on vacation and a bit hard to reach. Lyle believes this is correct, too! 73, Lyle KK7P/7 (in Cottonwood, AZ) ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by wayne burdick
Typo. I meant to say SMTR NOR in the paragraph below.
Wayne Wayne Burdick wrote: > We're going to add a final instruction to K3 Utility explaining that > SMTR OF and SC must be adjusted after running RF GAIN calibration. I > suggest doing this with SMTR MD = ABS, preamp ON. Under these > conditions you should be able to set SMTR OF and SC such that 50 uV > produces an S9 reading, and 1 uV results in S2 to S3..... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Thank you, Wayne. I just switched back. I will rerun the calibration
tomorrow based on your advice. I had done so earlier without reading this and I did not follow the recommended process exactly as I had ordered my unit factory assembled. 73, Bill K9YEQ K2 #35; KX1 #35; K3 #1744; mini mods ATS-3B -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Wayne Burdick Sent: Wednesday, October 07, 2009 9:28 PM To: Wayne Burdick Cc: [hidden email] Subject: Re: [Elecraft] S-meter calibration Typo. I meant to say SMTR NOR in the paragraph below. Wayne Wayne Burdick wrote: > We're going to add a final instruction to K3 Utility explaining that > SMTR OF and SC must be adjusted after running RF GAIN calibration. I > suggest doing this with SMTR MD = ABS, preamp ON. Under these > conditions you should be able to set SMTR OF and SC such that 50 uV > produces an S9 reading, and 1 uV results in S2 to S3..... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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