Tnx David Wilburn NM4M Sent from my Verizon Wireless BlackBerry
-----Original Message----- From: Merv Schweigert <k...@flex.com> Date: Sat, 15 Aug 2009 16:29:47 To: <dave.wilb...@verizon.net> Cc: Brett Howard<br...@livecomputers.com>; <elecraft-boun...@mailman.qth.net>; <Elecraft@mailman.qth.net> Subject: Re: [Elecraft] K3 new V3.25 NR not so good for CW week signal dave.wilb...@verizon.net wrote: > What is the best way of determining the gain setting? Seem to recall an app > for this. > > David Wilburn > NM4M > Sent from my Verizon Wireless BlackBerry > > Perhaps this is what you were looking for Dave, [Elecraft] On K3 crystal filter gain compensation (FLx GN) wayne burdick Mon, 15 Jun 2009 12:26:43 -0700 Lately there has been some discussion about how much gain to add when compensating for loss in the K3's individual crystal filters. The general guideline is "as little as possible." I'd suggest starting with 0 and working up to as high as a few dB only if it seems necessary. Narrow bandwidths themselves create a psychoacoustic "gain" effect, so you don't really have to make up for the entire loss relative to wide filters. Also, excessive gain can in extreme cases worsen the performance of DSP signal processing, such as noise reduction (NR). Finally, AGC tends to flatten signal amplitudes in general, further reducing the need for per-filter compensation. While I'm on this topic, I'd also like to suggest using a minimum of both RX and TX EQ. The '0' levels were carefully determined empirically, and in most cases the optimal values will be well below the maximum range provided. Unless you have an aural sensitivity issue in some pitch range, or a serious mic deficiency, I'd stay between +/- 6 dB. As with filter gain settings, excessive values can result in adverse interaction with the DSP. And yes, there will be per-mode RX EQ in a future firmware revision. Thanks for all the suggestions on this. 73, Wayne N6KR ______________________________________________________________ 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
