a question to Wayne Burdick - K3S if gain
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I need an info, and this time I thought "why not ask to the Elecraft nr.1 top
tech?" If it is possible. On my Elecraft K3S, sn 10715, the if gain, or better the FLx GN, was setted 0 for FL1 (2700hz-5 pole), 4 for FL2 (500hz-5 pole) and 8 for FL3 (200hz-5 pole). I read somewhere that it would be better 0 for wide filter, 2dB for medium filter, 4 dB for narrow filter. What is better Wayne? Can I use on my great K3S 0dB-2dB-4dB? Or you prefer other settings? C op 99% of time... Second and least question for Wayne. Sometime I like to use my old Cubic Astro 102BXA, yesterday on 10 meters, with a bug. How can be that this rig, 35 years old, have the best agc and a great qsk even for today standards? Lot better than every ja rigs, but even more pleasant to listen than today greatest rigs in the world (Elecraft obviously....) Can it be that audio derived agc (I think it have this kind of agc) is the best even today? -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: a question to Wayne Burdick - K3S if gain
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On Sun, Jul 8, 2018 at 4:49 AM, IK4EWX <[hidden email]> wrote:
> On my Elecraft K3S, sn 10715, the if gain, or better the FLx GN, was setted > 0 for FL1 (2700hz-5 pole), > 4 for FL2 (500hz-5 pole) and 8 for FL3 (200hz-5 pole). > I read somewhere that it would be better 0 for wide filter, 2dB for medium > filter, 4 dB for narrow filter. > The K3 manual provides 0/2/4 as suggested values. The filters in your radio, as determined by the factory calibration procedure, must have needed more gain. What is better Wayne? Can I use on my great K3S 0dB-2dB-4dB? Or you prefer > other settings? > You can change the Flx gain values and hear the sensitivity of each filter go up and down. Ideally, signal strength should not change as you switch between filters. The K3 Utility provides an RF Gain calibration procedure too (requires a signal generator). > Sometime I like to use my old Cubic Astro 102BXA, yesterday on 10 meters, > with a bug. > How can be that this rig, 35 years old, have the best agc and a great qsk > even for today standards? > How can one define "best AGC?" Define "more pleasant." Maybe you can post an audio recording made from the headphone jack with an isolation transformer so that we can hear what you're hearing. Have you tried changing the K3's AGC settings from the factory defaults to the values recommended here <http://elecraft.365791.n2.nabble.com/K3-Receiver-mush-tp7627277p7627323.html> ? As for QSK, T/R turnaround time is probably better in the Swan rig because it doesn't have any digital signal processing, so no latency added, so no delays waiting for buffers to fill before the receiver hears signals between elements. But no DSP means limited noise reduction, limited notch controls, no adjustable noise blanker, etc. You can't have everything. 73, Bob, N6TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: a question to Wayne Burdick - K3S if gain
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In reply to this post by IK4EWX
The filter gain settings are only the suggested starting points, and
will work if your particular filters are "average", but in fact the optimum setting will vary from filter to filter. One method for determining the proper gain to use is to use the gain metering in the K2 itself and a signal generator. You will be using AFV and dBV in the Alternate VFO B display. See page 38 of the K3S manual. Be sure to turn Tech Mode ON in the configuration menu. Turn AGC off and center the signal in the narrowest filter (in CW mode). Then go to the widest filter. (stay in CW mode) Set the audio gain for a comfortable level and look at the K3S AFV - wait until it settles. Do not readjust the AF gain until finished. Change the VFO B display to dBV - it should read zero dB. Now switch to FL2 and again note the dBV value - if it is also zero, you already have the correct FLx GN value set. If not zero, make note of the dBV value and do the same with FL3. Once you have the dBV readings from the procedure above, you may go into the CONFIG:TXx GN values up or down by the dBV values you measured. This procedure is indicated on page 40 of the K3S manual, but I believe I have provided more detail. For setting the AGC for your K3S, you might want to look at the information contained in the "Noisy K3" article on my website www.w3fpr.com. KE7X, Fred Cady also has some information on his website. 73, Don W3FPR On 7/8/2018 7:49 AM, IK4EWX wrote: > I need an info, and this time I thought "why not ask to the Elecraft nr.1 top > tech?" > If it is possible. > On my Elecraft K3S, sn 10715, the if gain, or better the FLx GN, was setted > 0 for FL1 (2700hz-5 pole), > 4 for FL2 (500hz-5 pole) and 8 for FL3 (200hz-5 pole). > I read somewhere that it would be better 0 for wide filter, 2dB for medium > filter, 4 dB for narrow filter. > What is better Wayne? Can I use on my great K3S 0dB-2dB-4dB? Or you prefer > other settings? > C op 99% of time... Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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