Correction - Lyle's post was November 5. 73, Don W3FPR Don Wilhelm wrote: > Bill, > > If the K3 S-meter is calibrated with the preamp ON, and then ABS mode > is set on, the S-meter response for a 50 uV input will be S-7. > If one is going to use S-meter ABS, then it is best to calibrate the > S-meter for S-9with the preamp off. > > Yes, I know what "the manufacturer's instructions" say, but I know how > my K3 responds, and I also recall Lyle Johnson's response to this exact > situation in his posting of November 15, 2009 in which he said the > S-meter must be calibrated for the way you will use it. He in fact > calibrates his with the PREAMP and ATTN both OFF and uses the S-meter in > ABS mode (just as I do). When calibrated that way, it will not be > correct in NORMAL mode if the preamp is ON. > > In other words, the S-meter will respond correctly only under the > conditions for which you calibrated it. You get to decide what your > normal operating situation will be - S-meter normal or absolute, preamp > on or off and attenuator on or off. I prefer to use S-meter absolute so > S-9 indicates 50 uV at the antenna input regardless of whether the > preamp or attenuator is on or off. Take your pick. > > Yes, I believe the manual could be more explicit. > 73, > Don W3FPR > > Bill W4ZV wrote: > >> On Wed, Nov 18, 2009 at 12:09 AM, Philippe Trottet [via Elecraft] < >> [email protected]<ml-node%[email protected]> >> >> >>> 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 >>> >>> >>> >> Bon jour Phillipe, >> >> The simple answer is "Always follow the manufacturer's directions". A more >> complex one is that the K3, being a DSP rig, compensates internally in >> firmware for the fact that PREamp is ON during the calibration procedure. >> >> I also recommend using CONFIG: SMTR MD - ABS. This will place the K3's >> S-meter in ABSolute mode, so that the S-meter always reads the signal being >> applied to the input terminals correctly, independently of whether PRE or >> ATT are selected internally. This is also different than most rigs but, if >> you think about it, it is better since the S-meter always read the true >> signal level at the input terminal, before any gain or attenuation is >> applied inside. >> >> 73, Bill W4ZV >> >> >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.707 / Virus Database: 270.14.69/2508 - Release Date: 11/17/09 >> 02:40:00 >> >> >> > ______________________________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.707 / Virus Database: 270.14.69/2508 - Release Date: 11/17/09 > 02:40:00 > > ______________________________________________________________ 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
