Hi Philippe, I think that instruction is in error. I adjusted mine with both the preamp and the attenuator OFF. Makes more sense that way. Turn CONFIG: SMTR MODE to nor. Turn preamp and attenuator OFF, and then adjust your S meter. Now if you decide to turn SMTR MODE to ABS, you'll find that it is already adjusted correctly and does not require re-adjustment. Evidently, the current firmware has the ABS mode track the nor mode with both preamp and atteunator off. Perhaps there was a change in the firmware at some point in time that did not get reflected in the Operators Manual.
73, Oliver Johns W6ODJ On 17 Nov 2009, at 21:08, Philippe Trottet wrote: > Dears > I've seen on the manual S9 /50 microvolts is adjusted with Preamp ON . > As a new Elecrafter I need some explanations, because with my > previous rigs, I use to calibrate S9 without the preamp. > Thanks > Philippe A65BI > K3 #3616 > > > >>>> Bill W4ZV <[email protected]> 17-11-2009 22:25 >>> > > > > Geoffrey Downs-2 wrote: >> >> A couple of years ago there was some correspondence on the >> reflector about >> whether an S unit is 6db or 4 db and there appears to be historical >> precedent for both but I have looked at the archive and can't find >> where >> it >> rested as far as the K3 is concerned. It occurred to me while >> recently >> re-calibrating my S meter with the XG2 that if, in accordance with >> the >> manual, you set S9 to be 50 microvolts and adopt 6 db per S unit the >> reading >> for 1 microvolt should be between S3 and S4 (S3 being 0.78 >> microvolts and >> S4 >> 1.56 microvolts by my calculations). For practical purposes S3 is >> probably >> close enough rather than "about S2 or 3" as shown in the manual. Or >> is it >> more complicated than that? My arithmetic is not up working out how >> many S >> units one microvolt would be at 4db per S unit but I suspect it >> would be >> further away from S2 or 3. Anyone care to comment? >> > > I believe 6 dB is the "correct" definition, but most S-meters (K3 > and Flex > 5k excluded) are very non-linear at low S-meter readings. IMHO the > following is an accurate summary of what readings should be: > > http://www.n6rk.com/S_unit_definitions.doc > > I would adjust the K3 for the XG2's 1 uV output to solidly display > S3 (i.e. > no flicker of S2-3). That would only be 2.16 dB off (20 log .78/1), > which > is probably "close enough". > > 73, Bill > -- > View this message in context: > http://n2.nabble.com/Re-K3-S-Meter-tp4019422p4020331.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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 > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
