Re: [Elecraft] K3 Caution when using an external monaural speaker
Hi Ron, I just ordered my K3 on Thursday. Do you know if this modification has already been phased in to new kits? 73, James KC2UEE Ron D'Eau Claire wrote: Hello David: Wayne asked me to reply since I prepared the application note. Only two resistors are needed, so if you've done the mod using the daughter board locations Wayne originally mentioned, you're all set. The version shown in the app note mimics what Aptos is doing as they modify the boards in inventory. The resistors are in the same place electrically, but they chose to put them on the main KIO3 board instead. We followed that in the application note so it'd be easy to tell if the modification has been made either in the field or at the factory. Ron AC7AC -- View this message in context: http://n2.nabble.com/K3-Caution-when-using-an-external-monaural-speaker-tp1680829p2328299.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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
Re: [Elecraft] K3 Caution when using an external monaural speaker
According to the Enhancements and App Notes page at: http://www.elecraft.com/K3/k3_app_notes.htm This modification is needed for all K3s shipped approximately before 01/12/09 containing either a Revision XB or Revision A KIO3 board. Bob NW8L On Sat, Feb 14, 2009 at 5:41 PM, KC2UEE kc2...@gmail.com wrote: Hi Ron, I just ordered my K3 on Thursday. Do you know if this modification has already been phased in to new kits? 73, James KC2UEE Ron D'Eau Claire wrote: Hello David: Wayne asked me to reply since I prepared the application note. Only two resistors are needed, so if you've done the mod using the daughter board locations Wayne originally mentioned, you're all set. The version shown in the app note mimics what Aptos is doing as they modify the boards in inventory. The resistors are in the same place electrically, but they chose to put them on the main KIO3 board instead. We followed that in the application note so it'd be easy to tell if the modification has been made either in the field or at the factory. Ron AC7AC -- View this message in context: http://n2.nabble.com/K3-Caution-when-using-an-external-monaural-speaker-tp1680829p2328299.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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 __ 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
Re: [Elecraft] K3 Caution when using an external monaural speaker
Yes, but it was also phased in at Aptos on Rev A boards at some point so, while all Rev A and earlier boards need the mod, the more current K3's with Rev A boards probably have had the mod made at the factory already. There's a way to check by just opening the K3's top cover shown in the document. Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob Cunnings Sent: Saturday, February 14, 2009 5:09 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 Caution when using an external monaural speaker According to the Enhancements and App Notes page at: http://www.elecraft.com/K3/k3_app_notes.htm This modification is needed for all K3s shipped approximately before 01/12/09 containing either a Revision XB or Revision A KIO3 board. Bob NW8L __ 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
Re: [Elecraft] K3 Caution when using an external monaural speaker
David Pratt-4 wrote: In a recent message, wayne burdick n...@elecraft.com wrote ... The short version is: put 1/8-W (or larger), 470-ohm resistors from each speaker output to ground. (The actual value isn't critical; anything from 330 to 1000 ohms would probably work just as well.) This can be done conveniently on the KIO3's audio daughter board, at its single-row, right-angle male connector. I see that the AF mod application note at http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_A.pdf is somewhat different to what you describe, Wayne. The 470 ohm resistors appear to be in different places of the circuit. Does this come to the same thing, or are the two resistors from each speaker output to ground also necessary? 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- View this message in context: http://n2.nabble.com/K3-Caution-when-using-an-external-monaural-speaker-tp1680829p2321380.html Sent from the Elecraft mailing list archive at Nabble.com. __ 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
Re: [Elecraft] K3 Caution when using an external monaural speaker
In a recent message, Ron D'Eau Claire r...@cobi.biz wrote ... The version shown in the app note mimics what Aptos is doing as they modify the boards in inventory. The resistors are in the same place electrically, but they chose to put them on the main KIO3 board instead. Thank you, Ron, for your explanation. I have carried out the mod as in the App note. I was particularly puzzled by the resistor across pins 29 (TXD) 35 of P76 which appears to put the resistor between pin 14 of U1 and ground. I had difficulty in relating this to the original note. 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Caution when using an external monaural speaker
In a recent message, David Pratt da...@g4dmp.fsnet.co.uk wrote ... Thank you, Ron, for your explanation. I have carried out the mod as in the App note. I was particularly puzzled by the resistor across pins 29 (TXD) 35 of P76 which appears to put the resistor between pin 14 of U1 and ground. I had difficulty in relating this to the original note. My mistake, chaps, I think I have misinterpreted the pin numbers. They are evidently pins 4 16 of P76 which places the resistor across SPKR R. Sorry! 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Caution when using an external monaural speaker
In a recent message, wayne burdick n...@elecraft.com wrote ... The short version is: put 1/8-W (or larger), 470-ohm resistors from each speaker output to ground. (The actual value isn't critical; anything from 330 to 1000 ohms would probably work just as well.) This can be done conveniently on the KIO3's audio daughter board, at its single-row, right-angle male connector. I see that the AF mod application note at http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_A.pdf is somewhat different to what you describe, Wayne. The 470 ohm resistors appear to be in different places of the circuit. Does this come to the same thing, or are the two resistors from each speaker output to ground also necessary? 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Caution when using an external monaural speaker
Hello David: Wayne asked me to reply since I prepared the application note. Only two resistors are needed, so if you've done the mod using the daughter board locations Wayne originally mentioned, you're all set. The version shown in the app note mimics what Aptos is doing as they modify the boards in inventory. The resistors are in the same place electrically, but they chose to put them on the main KIO3 board instead. We followed that in the application note so it'd be easy to tell if the modification has been made either in the field or at the factory. Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Pratt Sent: Wednesday, January 14, 2009 1:10 PM To: wayne burdick Cc: Elecraft List Subject: Re: [Elecraft] K3 Caution when using an external monaural speaker In a recent message, wayne burdick n...@elecraft.com wrote ... The short version is: put 1/8-W (or larger), 470-ohm resistors from each speaker output to ground. (The actual value isn't critical; anything from 330 to 1000 ohms would probably work just as well.) This can be done conveniently on the KIO3's audio daughter board, at its single-row, right-angle male connector. I see that the AF mod application note at http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_A.pdf is somewhat different to what you describe, Wayne. The 470 ohm resistors appear to be in different places of the circuit. Does this come to the same thing, or are the two resistors from each speaker output to ground also necessary? 73 -- David G4DMP Leeds, England, UK -- ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Caution when using an external monaural speaker
Notice that the app note (rev A) for this has an error. Figure 4 legend reads Installing the 470K Ohm resistors Should read ... 470 Ohm resistors. -Bruce N1RX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K3 Caution when using an external monaural speaker
The instructions, including the text and illustrations, are all correct. The mistake you saw was in the title (caption) for one of the figures. Since it's not something one normally looks at when doing the mod, the reviewers and I all missed it Nonetheless, a corrected Rev B App Note was prepared Tuesday and should appear on the web site soon. Good eyes Bruce :-) Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bruce Beford Sent: Wednesday, January 14, 2009 5:32 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 Caution when using an external monaural speaker Notice that the app note (rev A) for this has an error. Figure 4 legend reads Installing the 470K Ohm resistors Should read ... 470 Ohm resistors. -Bruce N1RX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K3 Caution when using an external monaural speaker
Most of the K3 owners probably already know this but for the benefit of those that don't please be aware that you may damage the audio amplifier chip on the DSP board if you enable Config Speaker 2 and then plug a monaural speaker plug into the rear panel speaker jack. This overloads the audio amp. If running a monaural speaker the Speaker setting must be set to 1. I would recommend always using a set of stereo speakers no matter what the configuration setting for speakers. I am somewhat embarrassed to say that the audio amp chip is really not much fun to replace and I will be more careful in the future. :-( Todd, WA7U ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
