K2 APF implementation?
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Any chance we might see an implementation of APF for the audio-based DSP of the K2? I realize it might require swapping out U3 to implement the change. I would even give up some of the other functionality if adequate memory resources don't exist to implement an additional function.
Any interest? Jeff N7KRT ______________________________________________________________ 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 |
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After you mentioned this a couple of weeks ago, Ron, I bought the AF1
and built it in time for CQWW CW this past weekend. I'm not a strong CW operator yet, and these contests are a great opportunity for me to learn by listening. I thought the AF1 might help, given my antenna situation. Much to my surprise, for the first time I had to use the attenuator on my K1! The JA's especially were beating down the door; too bad they couldn't hear me. Even so, I found plenty of stations that were faint enough that I wanted to use the AF1. At first, I thought it didn't work very well, but then I had a few stations go from "I can puzzle this out in time" to "hey, that was easy" after turning on the AF1! Clearly I'm going to have to play with it more to understand how to adjust it properly, but it does work. I also appreciated how I could have it inline and only turn it on when needed, and even though I'm in the camp that wonders if it would really be so hard to design the mini modules to fit in to a box, the rubber feet kept it stable on top of my K1 even when turning it on without having to hold it. I consider the AF1 a good purchase that will get better as I learn more, and another fun build. Thanks for the tip. 73, Byron N6NUL K1 #2799 AF1, DL1, N-gen, W1, XG2, BL2 On Sun, Nov 28, 2010 at 8:19 PM, Ron D'Eau Claire <[hidden email]> wrote: > Jeff, I have compared the K3's APF with the filter offered in Elecraft's > AF-1 Active Filter mini-module kit. There is no difference I can hear in the > performance. Actually the AF-1 has more flexibility since you have two > levels of "Q" to choose from, variable gain, and an independent variable > low-pass filter function. > > At $60, it's a great little filter. > > For an old vacuum-tube jockey like me it's satisfying to see digital gear > struggling to do something as well as analog circuits, Hi! I'll hand it to > Lyle; he succeeded with the APF. It's darn near as good as the AF1. > > Ron AC7AC > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of jeff martin > Sent: Sunday, November 28, 2010 6:37 PM > To: [hidden email] > Subject: [Elecraft] K2 APF implementation? > > Any chance we might see an implementation of APF for the audio-based DSP of > the K2? I realize it might require swapping out U3 to implement the change. > I would even give up some of the other functionality if adequate memory > resources don't exist to implement an additional function. > > Any interest? > > Jeff > N7KRT > > ______________________________________________________________ > 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 > -- - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org ______________________________________________________________ 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 |
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In reply to this post by AC7AC
Ron,
Great idea! I agree that the AF-1 would do the trick, but was hoping that something integrated into the existing K2 firmware/hardware could be implemented. If that doesn't pan out, I'll opt for the AF-1. Jeff --- On Sun, 11/28/10, Ron D'Eau Claire <[hidden email]> wrote: > From: Ron D'Eau Claire <[hidden email]> > Subject: RE: [Elecraft] K2 APF implementation? > To: "'jeff martin'" <[hidden email]>, [hidden email] > Date: Sunday, November 28, 2010, 8:19 PM > Jeff, I have compared the K3's APF > with the filter offered in Elecraft's > AF-1 Active Filter mini-module kit. There is no difference > I can hear in the > performance. Actually the AF-1 has more flexibility since > you have two > levels of "Q" to choose from, variable gain, and an > independent variable > low-pass filter function. > > At $60, it's a great little filter. > > For an old vacuum-tube jockey like me it's satisfying to > see digital gear > struggling to do something as well as analog circuits, Hi! > I'll hand it to > Lyle; he succeeded with the APF. It's darn near as good as > the AF1. > > Ron AC7AC > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] > On Behalf Of jeff martin > Sent: Sunday, November 28, 2010 6:37 PM > To: [hidden email] > Subject: [Elecraft] K2 APF implementation? > > Any chance we might see an implementation of APF for > the audio-based DSP of > the K2? I realize it might require swapping out U3 to > implement the change. > I would even give up some of the other functionality if > adequate memory > resources don't exist to implement an additional function. > > Any interest? > > Jeff > N7KRT > > ______________________________________________________________ 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 |
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When you consider that the K2's buttons have two and sometimes three different functions already (there's a clock in there? Really?) I would prefer to have an outboard audio filter like the AF-1. Plus you need a knob or two and I don't think it would be very easy to retrofit extra knob functions into the existing radio.
I'd like one too, but I don't think it's practical in the K2. Maybe in the K2.1! 8-) 73, Ken Alexander VE3HLS --- On Mon, 11/29/10, jeff martin <[hidden email]> wrote: > From: jeff martin <[hidden email]> > Subject: Re: [Elecraft] K2 APF implementation? > To: [hidden email], "Ron D'Eau Claire" <[hidden email]> > Date: Monday, November 29, 2010, 8:47 AM > Ron, > Great idea! I agree that the AF-1 would do the trick, but > was hoping that something integrated into the existing K2 > firmware/hardware could be implemented. If that doesn't pan > out, I'll opt for the AF-1. > > Jeff > > --- On Sun, 11/28/10, Ron D'Eau Claire <[hidden email]> > wrote: > > > From: Ron D'Eau Claire <[hidden email]> > > Subject: RE: [Elecraft] K2 APF implementation? > > To: "'jeff martin'" <[hidden email]>, > [hidden email] > > Date: Sunday, November 28, 2010, 8:19 PM > > Jeff, I have compared the K3's APF > > with the filter offered in Elecraft's > > AF-1 Active Filter mini-module kit. There is no > difference > > I can hear in the > > performance. Actually the AF-1 has more flexibility > since > > you have two > > levels of "Q" to choose from, variable gain, and an > > independent variable > > low-pass filter function. > > > > At $60, it's a great little filter. > > > > For an old vacuum-tube jockey like me it's satisfying > to > > see digital gear > > struggling to do something as well as analog circuits, > Hi! > > I'll hand it to > > Lyle; he succeeded with the APF. It's darn near as > good as > > the AF1. > > > > Ron AC7AC > > > > -----Original Message----- > > From: [hidden email] > > [mailto:[hidden email]] > > On Behalf Of jeff martin > > Sent: Sunday, November 28, 2010 6:37 PM > > To: [hidden email] > > Subject: [Elecraft] K2 APF implementation? > > > > Any chance we might see an implementation of APF > for > > the audio-based DSP of > > the K2? I realize it might require swapping out U3 to > > implement the change. > > I would even give up some of the other functionality > if > > adequate memory > > resources don't exist to implement an additional > function. > > > > Any interest? > > > > Jeff > > N7KRT > > > > > > > > ______________________________________________________________ > 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 > 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 |
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My thinking was to ustilize the existing KDSP2 menu structure to adjust the filter. Something like add a CW filter selection of "APF" to the existing selections, and then menus to select center freq, Q and gain.
One thing I have done to emulate this is to set the existing CW filters to various bandwidths, and then with the center freq at my chosen sidetone pitch, increase the gain setting to peak the filter. Sometimes I'll turn on the noise reduction as well. In some cases it has been a bit startling how a Q2 or 3 signal can become comfortable copy. The only problem with the method is that it requires a lot of button pushing and you cannot really store the resulting filter (the gain control affects all of the CW filters) as a separate entity. --- On Mon, 11/29/10, Ken Alexander <[hidden email]> wrote: > From: Ken Alexander <[hidden email]> > Subject: Re: [Elecraft] K2 APF implementation? > To: [hidden email], "Ron D'Eau Claire" <[hidden email]>, "jeff martin" <[hidden email]> > Date: Monday, November 29, 2010, 6:47 AM > When you consider that the K2's > buttons have two and sometimes three different > functions already (there's a clock in there? Really?) > I would prefer to have an outboard audio filter like the > AF-1. Plus you need a knob or two and I don't think it > would be very easy to retrofit extra knob functions into the > existing radio. > > I'd like one too, but I don't think it's practical in the > K2. Maybe in the K2.1! 8-) > > 73, > > Ken Alexander > VE3HLS > > > > --- On Mon, 11/29/10, jeff martin <[hidden email]> > wrote: > > > From: jeff martin <[hidden email]> > > Subject: Re: [Elecraft] K2 APF implementation? > > To: [hidden email], > "Ron D'Eau Claire" <[hidden email]> > > Date: Monday, November 29, 2010, 8:47 AM > > Ron, > > Great idea! I agree that the AF-1 would do the trick, > but > > was hoping that something integrated into the existing > K2 > > firmware/hardware could be implemented. If that > doesn't pan > > out, I'll opt for the AF-1. > > > > Jeff > > > > --- On Sun, 11/28/10, Ron D'Eau Claire <[hidden email]> > > wrote: > > > > > From: Ron D'Eau Claire <[hidden email]> > > > Subject: RE: [Elecraft] K2 APF implementation? > > > To: "'jeff martin'" <[hidden email]>, > > [hidden email] > > > Date: Sunday, November 28, 2010, 8:19 PM > > > Jeff, I have compared the K3's APF > > > with the filter offered in Elecraft's > > > AF-1 Active Filter mini-module kit. There is no > > difference > > > I can hear in the > > > performance. Actually the AF-1 has more > flexibility > > since > > > you have two > > > levels of "Q" to choose from, variable gain, and > an > > > independent variable > > > low-pass filter function. > > > > > > At $60, it's a great little filter. > > > > > > For an old vacuum-tube jockey like me it's > satisfying > > to > > > see digital gear > > > struggling to do something as well as analog > circuits, > > Hi! > > > I'll hand it to > > > Lyle; he succeeded with the APF. It's darn near > as > > good as > > > the AF1. > > > > > > Ron AC7AC > > > > > > -----Original Message----- > > > From: [hidden email] > > > [mailto:[hidden email]] > > > On Behalf Of jeff martin > > > Sent: Sunday, November 28, 2010 6:37 PM > > > To: [hidden email] > > > Subject: [Elecraft] K2 APF implementation? > > > > > > Any chance we might see an implementation of > APF > > for > > > the audio-based DSP of > > > the K2? I realize it might require swapping out > U3 to > > > implement the change. > > > I would even give up some of the other > functionality > > if > > > adequate memory > > > resources don't exist to implement an additional > > function. > > > > > > Any interest? > > > > > > Jeff > > > N7KRT > > > > > > > > > > > > > > > ______________________________________________________________ > > 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 > > > ______________________________________________________________ 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 |
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In reply to this post by jeff martin-6
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Good points, Ron. And you have also answered my biggest concern with using the AF-1 as an external solution...finding a suitable enclosure (without actually rolling my own...I'm lazy, I guess!). The W8FGU enclosures are very cool! I am constantly amazed at the number of talented folks that have created neat products to enhance the Elecraft kits!
Thanks, Jeff --- On Mon, 11/29/10, Ron D'Eau Claire <[hidden email]> wrote: > From: Ron D'Eau Claire <[hidden email]> > Subject: RE: [Elecraft] K2 APF implementation? > To: "'jeff martin'" <[hidden email]>, [hidden email] > Date: Monday, November 29, 2010, 10:10 AM > Yeah, it's nice to have it all built > in, if possible. OTOH, it's nice having > four independently-adjustable controls for Q, center > frequency, gain, and > high-frequency roll-off. > > And W8FGU makes some neat enclosures for the mini-modules, > including the > AF1. > > http://w8fgu.home.comcast.net/~w8fgu/enclosures.html > > Ron AC7AC > > > -----Original Message----- > > Ron, > Great idea! I agree that the AF-1 would do the trick, but > was hoping that > something integrated into the existing K2 firmware/hardware > could be > implemented. If that doesn't pan out, I'll opt for the > AF-1. > > Jeff > > > > ______________________________________________________________ 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 |
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In reply to this post by Byron N6NUL
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In reply to this post by jeff martin-6
And such a deal too! Quote from the website (not my wording):
"AF1 Active Filter with Audio Amplifier Enclosure" for $29.95. He's selling the filter with enclosure for $29.95? Heck, Elecraft sells the AF-1 alone for $59.95. How does he do it?? 8-) 73, Ken, VE3HLS > Good points, Ron. And you have also > answered my biggest concern with using the AF-1 as an > external solution...finding a suitable enclosure (without > actually rolling my own...I'm lazy, I guess!). The W8FGU > enclosures are very cool! I am constantly amazed at the > number of talented folks that have created neat products to > enhance the Elecraft kits! > > Thanks, > > Jeff > > --- On Mon, 11/29/10, Ron D'Eau Claire <[hidden email]> > wrote: > > > From: Ron D'Eau Claire <[hidden email]> > > Subject: RE: [Elecraft] K2 APF implementation? > > To: "'jeff martin'" <[hidden email]>, > [hidden email] > > Date: Monday, November 29, 2010, 10:10 AM > > Yeah, it's nice to have it all built > > in, if possible. OTOH, it's nice having > > four independently-adjustable controls for Q, center > > frequency, gain, and > > high-frequency roll-off. > > > > And W8FGU makes some neat enclosures for the > mini-modules, > > including the > > AF1. > > > > http://w8fgu.home.comcast.net/~w8fgu/enclosures.html > > > > Ron AC7AC > > > > > > -----Original Message----- > > > > Ron, > > Great idea! I agree that the AF-1 would do the trick, > but > > was hoping that > > something integrated into the existing K2 > firmware/hardware > > could be > > implemented. If that doesn't pan out, I'll opt for > the > > AF-1. > > > > Jeff > > > > > > > > > > > > ______________________________________________________________ > 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 > 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 |
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In reply to this post by AC7AC
Ron, when I read this I didn't think it sounded like the KAF2 I have, so I checked the manual (you wrote it?) Per the specifications: BPF Bandwidth: 80 Hz @ -3 dB; 270 Hz @ -20 dB Gain: 0-1 dB in OFF (LPF only) and AF1 (first CW filter stage) modes, slightly higher in AF2 mode (both stages). Contrast this to the K3's APF: BPF with 30 Hz @ -3 dB and gain of +9 dB. http://sites.google.com/site/ft1000apf/w6lxanalysisoftheapfcircuitintheft-1000 (see Slide #3) The KAF2 is a typical audio bandpass filter like those found in many rigs (e.g. TS-930S, etc). The K3 APF is an entirely different animal based on the FT-1000D's highly acclaimed APF. I've never found the KAF2 to be very effective but the K3's can be quite effective in certain cases (but not all). 73, Bill |
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In reply to this post by jeff martin-6
On 11/29/2010 11:10 AM, jeff martin wrote:
> Good points, Ron. And you have also answered my biggest concern with > using the AF-1 as an external solution...finding a suitable enclosure > (without actually rolling my own...I'm lazy, I guess!). The W8FGU > enclosures are very cool! I am constantly amazed at the number of > talented folks that have created neat products to enhance the > Elecraft kits! I have Dave's W1 enclosure and the dust cover for my Hexkey ... I was sort of his field tester. They are indeed great. When Rose made my K2 field case, she arranged for a padded board on top of the K2 after it's put in on its side, and the W1 in Dave's enclosure + a Bencher BY-1 fit nicely on top. Makes a great kit for SOTA summit activations. It's sort of a little economic community that has grown up around Elecraft products. I have the audio filter internal to my K2 and use it often. It's not quite the same as the K3 APF, but it does a very similar job. It does not ring in the slightest that I can tell. The K2 front panel makes multiple use of pretty much every control. I'm not sure I'd like yet more functions. Given that the K2 firmware is not field downloadable as is the K3, I don't think I'd spring for an APF mod. I know how to use my K2, it works just super, and "if it works, don't mess with it." Besides, I think Wayne or Eric once said they consider the K1 and K2 to be "mature product lines." 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org ______________________________________________________________ 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 |
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In reply to this post by AC7AC
On Mon, Nov 29, 2010 at 7:20 PM, Ron D'Eau Claire <[hidden email]> wrote:
> I didn't say the KAF2, Bill. I'm speaking of the Elecraft AF1 Mini-module. > > The circuit in the AF1 is an active filter of the type the APF emulates in > DSP. > My mistake Ron. I thought you meant the KAF2. 73, Bill ______________________________________________________________ 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 |
Re: K2 APF implementation?
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In reply to this post by Ken Alexander-2
Wow - I haven't been around for a couple of days and I get back on the
list and find my name all over it ;-) Apparently, I've never really read my website too closely. When I put those descriptions up there, I just added the word "Enclosure" to the description Elecraft had for their mini-modules. I will correct this when I get around to updating the site. Thanks for pointing it out. I'll never profess to be a great business minded individual, but unless Eric and I could work out one heck of a deal, I won't be able to sell the enclosure with the AF1 for that price ;-) Thanks for all the great comments on the enclosures and please don't hesitate to contact me directly for any questions of comments. 73, Dave W8FGU On 11/29/2010 4:17 PM, Ken Alexander wrote: > And such a deal too! Quote from the website (not my wording): > "AF1 Active Filter with Audio Amplifier Enclosure" for $29.95. > > He's selling the filter with enclosure for $29.95? Heck, Elecraft sells the AF-1 alone for $59.95. How does he do it?? 8-) > > 73, > > Ken, VE3HLS > > > >> Good points, Ron. And you have also >> answered my biggest concern with using the AF-1 as an >> external solution...finding a suitable enclosure (without >> actually rolling my own...I'm lazy, I guess!). The W8FGU >> enclosures are very cool! I am constantly amazed at the >> number of talented folks that have created neat products to >> enhance the Elecraft kits! >> >> Thanks, >> >> Jeff >> >> --- On Mon, 11/29/10, Ron D'Eau Claire<[hidden email]> >> wrote: >> >>> From: Ron D'Eau Claire<[hidden email]> >>> Subject: RE: [Elecraft] K2 APF implementation? >>> To: "'jeff martin'"<[hidden email]>, >> [hidden email] >>> Date: Monday, November 29, 2010, 10:10 AM >>> Yeah, it's nice to have it all built >>> in, if possible. OTOH, it's nice having >>> four independently-adjustable controls for Q, center >>> frequency, gain, and >>> high-frequency roll-off. >>> >>> And W8FGU makes some neat enclosures for the >> mini-modules, >>> including the >>> AF1. >>> >>> http://w8fgu.home.comcast.net/~w8fgu/enclosures.html >>> >>> Ron AC7AC >>> >>> >>> -----Original Message----- >>> >>> Ron, >>> Great idea! I agree that the AF-1 would do the trick, >> but >>> was hoping that >>> something integrated into the existing K2 >> firmware/hardware >>> could be >>> implemented. If that doesn't pan out, I'll opt for >> the >>> AF-1. >>> >>> Jeff >>> >>> >>> >>> >> >> >> >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ > 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 > > ______________________________________________________________ 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 |
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