K3 S9 calibration?
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I see in the Yahoo K3 User's Group that Bob Sherwood just discussed filter
performance with the K3 he has been testing. He commented that S9 at 50uV is with the preamp off. According to my manual, you should cal S9 at 50uV with the preamp on. I cal'd as stated in the manual, but I wonder if this is really the right way to do this. Comments? Phil - AD5X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Phil,
There is no right or wrong way to do it - S-meter readings are arbitrary given the S-meter response set into a variety of 'competitors' transceivers . Take your pick and realize the consequences of your actions. If you calibrate it with the preamp off ( which is what I would suggest on 40 meters), then the S-meter will be a bit more 'lively' with the preamp on. This choice is merely a matter of reference. Bob Sherwood chose to set it with the preamp off, but you may like it better with the preamp on - the choice is yours - just remember which way you did it so you can interpret your S-meter readings appropriately. 73, Don W3FPR Phil & Debbie Salas wrote: > I see in the Yahoo K3 User's Group that Bob Sherwood just discussed > filter performance with the K3 he has been testing. He commented that > S9 at 50uV is with the preamp off. According to my manual, you should > cal S9 at 50uV with the preamp on. I cal'd as stated in the manual, > but I wonder if this is really the right way to do this. Comments? > > Phil - AD5X > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Phil Salas
You can calibrate it either way. If you normally operate with preamp off as Rob does then calibrating it with premap off makes sense. If you normally operate with preamp on then follow the manual. 73, Bill W4ZV |
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To ask the obvious question ... since the S-meter is derived from the DSP and the DSP/controller should know if the preamp is on or off, why are there not two sets of calibrations so 50 uV at the antenna input is S9 whether the preamp is on or off? 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Bill W4ZV > Sent: Saturday, February 23, 2008 9:40 PM > To: [hidden email] > Subject: Re: [Elecraft] K3 S9 calibration? > > > Phil & Debbie Salas wrote: > > > > I see in the Yahoo K3 User's Group that Bob Sherwood just > > discussed filter performance with the K3 he has been > > testing. He commented that S9 at 50uV is with the preamp > > off. According to my manual, you should cal S9 at 50uV > > with the preamp on. I cal'd as stated in the manual, but > > I wonder if this is really the right way to do this. > > Comments? > > > > > > You can calibrate it either way. If you normally operate > with preamp off as Rob does then calibrating it with premap > off makes sense. If you normally operate with preamp on then > follow the manual. > > 73, Bill W4ZV > > -- > View this message in context: > http://www.nabble.com/K3-S9-calibration--tp15660022p15660103.html > Sent from the Elecraft mailing list archive at Nabble.com. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Joe Subich, W4TV wrote:
> To ask the obvious question ... since the S-meter is derived > from the DSP and the DSP/controller should know if the preamp is > on or off, why are there not two sets of calibrations so 50 uV > at the antenna input is S9 whether the preamp is on or off? This was discussed among field testers. Some of them (me included) wanted the s-meter setting to be independent of preamp setting, but apparently the arguments that "people will think the preamp doesn't work" and "other radios don't do this" were more persuasive. I suspect (but don't know for sure) that it would be possible to change this in firmware and maybe someday there will be an option to allow it to work this way. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bill W4ZV
"To ask the obvious question ... since the S-meter is derived
from the DSP and the DSP/controller should know if the preamp is on or off, why are there not two sets of calibrations so 50 uV at the antenna input is S9 whether the preamp is on or off? 73, Joe, W4TV " According to Rob Sherwood, this is exactly what is done in the TenTec Omni VII. Phil - AD5X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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