S-Meter Calibration
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Hello:
Is it just my unit or did your K3/100 from the factory assembled have the S-Meter way off in terms of calibration? I have #4854 which was assembled from the factory and the S-Meter was WAY OFF. I mean 50uV was reading S3. With my Elmer's scope and the nice tuning directions in the manual, we got it fairly accurate (S9 is 50uV without PRE on all bands). I am just curious if this was standard operating procedure? Side question, notice what I said, S9 without PRE. Yet the manual wants you to turn on PRE. Why? That doesn't make any sense to me. (Apologies if this has been rehashed before, I didn't do a thorough search on this topic) -aps ______________________________________________________________ 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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On Wed, Apr 20, 2011 at 2:58 PM, Alexander Sack <[hidden email]> wrote:
> Hello: > > Is it just my unit or did your K3/100 from the factory assembled have > the S-Meter way off in terms of calibration? I have #4854 which was > assembled from the factory and the S-Meter was WAY OFF. I mean 50uV > was reading S3. With my Elmer's scope and the nice tuning directions > in the manual, we got it fairly accurate (S9 is 50uV without PRE on > all bands). > > I am just curious if this was standard operating procedure? > > Side question, notice what I said, S9 without PRE. Yet the manual > wants you to turn on PRE. Why? That doesn't make any sense to me. > > (Apologies if this has been rehashed before, I didn't do a thorough > search on this topic) > > I do want to point out that I DID install the KAT3 and KXV3A (updated version for I/F out) after factory install. I just thought that maybe the addition of the I/F could have been the culprit for recalibration (now I have to go back and look at the KXV3A install instructions to see if I this is complete pilot error on my part). I still want to know about setting PRE on when tuning. That still doesn't make too much sense. -aps ______________________________________________________________ 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 Alexander Sack
When I built my K3 last summer, I elected to have the S-meter set to
Absolute, so that it doesn't change when I turn off/on ATT/PRE. It is supposed to be a measure of signal strength to the radio, is it not? ...bc -----Original Message----- From: Alexander Sack [mailto:[hidden email]] Sent: Wednesday, April 20, 2011 2:59 PM To: [hidden email] Subject: [Elecraft] S-Meter Calibration Hello: Is it just my unit or did your K3/100 from the factory assembled have the S-Meter way off in terms of calibration? I have #4854 which was assembled from the factory and the S-Meter was WAY OFF. I mean 50uV was reading S3. With my Elmer's scope and the nice tuning directions in the manual, we got it fairly accurate (S9 is 50uV without PRE on all bands). I am just curious if this was standard operating procedure? Side question, notice what I said, S9 without PRE. Yet the manual wants you to turn on PRE. Why? That doesn't make any sense to me. (Apologies if this has been rehashed before, I didn't do a thorough search on this topic) -aps ______________________________________________________________ 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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Bill,
I agree, and I am glad to see that the K3 has included ABS mode for the S-meter. If you are using ABS mode, calibrate the S-meter with the preamp off. If you are using NOR, then do as the manual says and calibrate it with the preamp ON. OTOH, if you are more interested in the bands where you run with the preamp OFF, then you may want to vary from the manual instructions even when using S-meter NOR. Take your pick, but at the same time, be aware of the consequences. If you calibrate with the preamp off, the S-meter will read too high when you activate the preamp should you be operating with S-meter NOR - the reverse will happen if you calibrate with the preamp on and operate with the preamp off. Take your pick, the K3 offers several choices - as the guardian Knight of the Holy Grail said in "Raiders" - choose wisely (and accept the consequences of your choice). 73, Don W3FPR On 4/20/2011 11:30 PM, Bill Conkling wrote: > When I built my K3 last summer, I elected to have the S-meter set to > Absolute, so that it doesn't change when I turn off/on ATT/PRE. It is > supposed to be a measure of signal strength to the radio, is it not? > > ...bc > > ______________________________________________________________ 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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On Wed, Apr 20, 2011 at 11:46 PM, Don Wilhelm <[hidden email]> wrote:
> Bill, > > I agree, and I am glad to see that the K3 has included ABS mode for the > S-meter. > If you are using ABS mode, calibrate the S-meter with the preamp off. If > you are using NOR, then do as the manual says and calibrate it with the > preamp ON. > > OTOH, if you are more interested in the bands where you run with the preamp > OFF, then you may want to vary from the manual instructions even when using > S-meter NOR. Take your pick, but at the same time, be aware of the > consequences. If you calibrate with the preamp off, the S-meter will read > too high when you activate the preamp should you be operating with S-meter > NOR - the reverse will happen if you calibrate with the preamp on and > operate with the preamp off. Take your pick, the K3 offers several choices > - as the guardian Knight of the Holy Grail said in "Raiders" - choose wisely > (and accept the consequences of your choice). > @Eric/Wayne or anyone, is there any down sides in calibrating the S-Meter with the PRE turned off? -aps ______________________________________________________________ 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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No downside at all. The "upside" is that you understand how you set
it and can then read it intelligibly. If you have the preamp on, you know it will read about 2 S units higher, and if you have the attenuator on it will read 1 1/2 to 2 S-units lower - that is unless you have set ABS mode on, and then the reading is not changed with PRE or ATT on or off. 73, Don W3FPR On 4/21/2011 5:24 PM, Alexander Sack wrote: > On Wed, Apr 20, 2011 at 11:46 PM, Don Wilhelm<[hidden email]> wrote: >> Bill, >> >> I agree, and I am glad to see that the K3 has included ABS mode for the >> S-meter. >> If you are using ABS mode, calibrate the S-meter with the preamp off. If >> you are using NOR, then do as the manual says and calibrate it with the >> preamp ON. >> >> OTOH, if you are more interested in the bands where you run with the preamp >> OFF, then you may want to vary from the manual instructions even when using >> S-meter NOR. Take your pick, but at the same time, be aware of the >> consequences. If you calibrate with the preamp off, the S-meter will read >> too high when you activate the preamp should you be operating with S-meter >> NOR - the reverse will happen if you calibrate with the preamp on and >> operate with the preamp off. Take your pick, the K3 offers several choices >> - as the guardian Knight of the Holy Grail said in "Raiders" - choose wisely >> (and accept the consequences of your choice). >> > @Eric/Wayne or anyone, is there any down sides in calibrating the > S-Meter with the PRE turned off? > > -aps > ______________________________________________________________ > 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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