++++++++++++++++++++ ++++++++++++++++++++ From: "Lyle Johnson" To: Cc: "self" Date: Tue, 25 Mar 2003 14:57:14 -0800 Subject: [Elecraft] K2 with DSP, big YES YES! Hmm, I've looked over the posting rules, and with the recent discussion about the SGC ADSP2 module and hacking it into the K2, I thought there might be some interest in seeing another way to mount a DSP module inside a K2... http://www.fidalgo.net/~wa7gxd/kdsp2.html Enjoy! 73, Lyle KK7P +++++++++++++++++++++ Date: Wed, 26 Mar 2003 07:10:31 -0500 From: Kotarak Subject: Re: [Elecraft] K2 with DSP, big YES YES! To: la3za at qsl.net, 'Lyle Johnson' Cc: elecraft at mailman.qth.net Well, SGC should look at this page to see (learn) how the things should be done the right way. Very elegant solution. Good job on the design Lyle! This is the kind of DSP i wouldnt hesitate to build and try in my K2. I can't speak for Lyle, but looking at the scematics i think he uses an Atmel chip with a firmware to access the K2's AuxBus and emulate the AFIL interface, so the things are transperant for the K2 and K2 acts as if a AFIL module is installed. I might be wrong of course! Very cool and professionally done. 73s KB1FZA ++++++++++++++++++++ From: "Wallace, Andy" To: "'Lyle Johnson'" , elecraft at mailman.qth.net Date: Thu, 27 Mar 2003 12:26:53 -0500 Subject: [Elecraft] KK7P KDSP2 module > -----Original Message----- > From: Lyle Johnson [mailto:wa7gxd at fidalgo.net] > > Hmm, I've looked over the posting rules, In my view, there should be no problem posting this sort of announcement. You're not taking money AWAY from Elecraft with your product, because to use it someone needs a K2...! > and with the recent > discussion about the SGC ADSP2 module and hacking it into the K2, I > thought there might be some interest in seeing another way to mount a DSP module > inside a K2... > > http://www.fidalgo.net/~wa7gxd/kdsp2.html Beautiful job, Lyle. I'm assuming that you were able to reverse engineer the AUXBUS commands to do this -- not impossible, given a logic analyzer and a KAF2 to pass commands back and forth to monitor. No need to make that public to anyone, and I agree completely with Elecraft's reasons for not making it public. It will be interesting to hear further details as things progress. I bet you got a pile of emails about this. I am sure a lot of people who were on the fence about a K2 because it lacked DSP would consider this very exciting news. The list of birdies was enlightening. You may want to do some sort of spectrum analyzer trace on the audio out to see how that is affected, using a signal or sweep generator, too. Bravo. Andy +++++++++++++++++ From: "Guy Olinger, K2AV" To: "Wallace, Andy" , "'Lyle Johnson'" , elecraft at mailman.qth.net Subject: Re: [Elecraft] KK7P KDSP2 module Date: Thu, 27 Mar 2003 13:08:29 -0500 Probably the biggest reason for keeping the aux bus tightly held, is that if it is published, then it has to be maintained. If company x designs a product on the aux bus protocol being just so, then it has a grievance if elecraft changes it. As it stands now, if elecraft wants to change it, it is a matter of its own firmware, and upgrades that its own customers apply. Anyone who reverse engineers it and bases a product on it does so at their own risk, and elecraft does not have to worry about keeping them happy. Based on their excellent track record, I'd want them to keep the new stuff in-house (and the revenue to keep them perking along). They decide themselves to publish it, then fine. Just my .02 & 73, Guy, K2AV. ++++++++++++++++++ From: "Lyle Johnson" To: "Eric Manning" , Subject: RE: [Elecraft] KK7P DSP module for K2 Date: Sat, 29 Mar 2003 22:34:31 -0800 Hello Eric! > What is the current drain of the KK7P?? The KdSP2 requires just under 70 mA. I measure about 65 mA on the prototype. 73, Lyle kK7P +++++++++++++++++++++ Date: Mon, 31 Mar 2003 10:22:59 -0100 From: "Julian (G4ILO)" Subject: Re: [Elecraft] KK7P DSP module for K2 To: "Elecraft List" If it is disabled, how much power does it draw (I'm wondering whether it is possible to disable it so as not to increase the drain during battery-powered operation.) Also, does the module provide a take-off point for an audio output that is independent of the volume control (for connection to a sound card.) I use the KAF2 for this, and it's a feature I'd be reluctant to lose. 73, -- Julian, G4ILO. (RSGB, ARRL, G-QRP, K2 #392) G4ILO's Shack: http://www.qsl.net/g4ilo Lyle Johnson wa7gxd at fidalgo.net wrote: Hello Eric! > What is the current drain of the KK7P?? The KdSP2 requires just under 70 mA. I measure about 65 mA on the prototype. 73, Lyle kK7P ++++++++++++++++++++ From: "Lyle Johnson" To: "Julian (G4ILO)" , "Elecraft List" Subject: RE: [Elecraft] KK7P DSP module for K2 Date: Mon, 31 Mar 2003 06:00:38 -0800 Hello Julian! > If it is disabled, how much power does it draw... Currently, the design offers no feature for bypassing. The software has not yet been optimized for "deep sleep" between samples, so it may be that the current drain will be reduced. On the other hand, it may also be that making a change like this will "pulse" the current drain and cause noise. We'll have to wait and see. > Also, does the module provide a take-off point for an audio > output that is independent of the volume control... The entire module is in the signal path before the volume control. Its output stage, which drives the K2, is from a low-impedance "headphone driver" amplifier, so a signal could be tapped from there. Keep in mind that it is a differential signal and there is no differential-to-single-ended conversion that takes place in physical circuitry. Please see the schematics posted on the website. 73, Lyle KK7P ++++++++++++++++++++ From: "Lyle Johnson" To: "Julian (G4ILO)" , "Elecraft List" Subject: RE: [Elecraft] KK7P DSP module for K2 Date: Tue, 1 Apr 2003 15:07:11 -0800 Hello Julian! > If it is disabled, how much power does it draw (I'm wondering > whether it is possible to disable it so as not to increase > the drain during battery-powered operation.) Since several poeple asked about this, I have taken a hard look at things. I just finished testing a software routine that can put the unit in a mode that effectively bypasses it. The audio path is still through the DSP module. The current drain drops from about 65 mA to under 10 mA under these conditions. I measure between 4 mA and 8 mA, so 10 mA should be a safe number. I know 10 mA is still a power drain, but do you think this level of current drain would be acceptable? 73, Lyle KK7P +++++++++++++++ Date: Wed, 2 Apr 2003 09:00:31 -0100 From: "Julian (G4ILO)" Subject: RE: [Elecraft] KK7P DSP module for K2 To: "Lyle Johnson" , "Elecraft List" That's a heck of an improvement over 65mA, Lyle. I'd say it was okay. I seem to recall the KAF2 increased the current drain by a few mA, so overall there will be hardly any increase at all. Are you taking orders yet? :-) 73, -- Julian, G4ILO. (RSGB, ARRL, G-QRP, K2 #392) G4ILO's Shack: http://www.qsl.net/g4ilo +++++++++++++++++