Walter, The manual is updated periodically, but the information in the K3 Utility is usually more recent. Even using the most recent data, remember that even that information is only an average. Filters of the same width can vary in their actual loss. So use the most recent data as a good starting point and then if you have a constant signal source, you can use the internal dBV meter in the K3 to determine exactly the gain settings for your particular set of filters. Start from the widest and work toward the next most narrow filter when doing the 'fine adjustment'.
73, Don W3FPR Walter V. Gilles wrote: > Greetings, > > I'm performing initial configuration/filter loss compensation. I have > the following filters (slot #) - BW: > > (1) 13.0 kHz (FM) > (2) 2.8kHz > (3) 1.8 kHz > (4) 0.40 kHz > (5) n/a > > I noticed that in the Owner's Manual, for Configuration/Filter Loss > Compensation, it suggests using 1-2 dB gain on the 0.40 kHz filter, > doesn't mention the 1.8 kHz filter. (No compensation for the others I > have is needed) > > In the K3 Utility Help info, same subject, it suggests 2 db for the > 1.8 kHz and 7 dB for the 0.40 kHz filter, which it says Elecraft uses > for the factory assembled units. > > I'm assuming that since there is a range of 0-8 dB gain defined for > filter insertion loss, overcompensating the gain on setup would not be > physically damaging to the K3, but perhaps it might not be > operationally optimum. And per some traffic on the reflector on this, > it appears what is needed is just enough gain so as not to notice any > degradation (nor unnecessary gain perhaps) when a narrower BW filter > is switched in with its associated gain compensation. > > I suppose I could start low and adjust upward if it seemed to need a > bit more boost, but 1-2 dB vs. 7 dB is a bit of a difference between > the Owner's Manual and the K3 Utility guidance. As long as I can't > damage the K3 by maximizing the settings (?), then trial-and-error > might be the surest way, given individual K3 build deviations. Any > words of wisdom appreciated on these different suggested settings > would be appreciated. Thanks much. 73 > > Walter, N0DZJ > > > ------------------------------------------------------------------------ > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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: 8.0.237 / Virus Database: 270.10.23/1953 - Release Date: 02/14/09 > 18:01:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
