Re: [Elecraft] K2 audio loss
When the headphone jack fails, no external audio, no external speaker audio. Doesn't sound like what you had, if you were able to get a hiss out of the speaker. Dave Wilburn K4DGW K2/100 - S/N 5982 Tom Z wrote: I was working a contest this weekend and at one point the audio in my K2 just stopped working. No audio on headphones or internal speaker. At full volume I could hear a slight trace of noise on the speaker. I reset power, and the audio came back. I guess I should have checked the external speaker jack, but in my panic, I did not. Does this sound like it could be the infamous headphone jack problem? When that does fail, does the external audio still work? I can not risk a failure during a contest, so I wonder if I should replace it. 73, Tom KG3V ___ 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] K2 audio loss
I was working a contest this weekend and at one point the audio in my K2 just stopped working. No audio on headphones or internal speaker. At full volume I could hear a slight trace of noise on the speaker. I reset power, and the audio came back. I guess I should have checked the external speaker jack, but in my panic, I did not. Does this sound like it could be the infamous headphone jack problem? When that does fail, does the external audio still work? I can not risk a failure during a contest, so I wonder if I should replace it. 73, Tom KG3V ___ 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] K2 Audio Loss Due to ESD
I have come up with what I think is a better mod for grounding the mike connector (J2) on the Front Panel board. The two standoffs were removed on each side of the mike connector. The two lockwashers on each standoff were removed. Two small expansion springs (about 1/2 X 3/16 before expansion with the last loop on each side lying flat to accept screw) were purchased at the hardware store. I placed the two springs on one screw securing them with the standoff, routed them on each side of J2, and joined them on the other standoff. These standoffs are at ground potential. I did not replace the two lockwashers on each standoff. This mod seems to make a good ground. Hopefully, this along with good grounding and well sanded panel connections will help eliminate loss of audio due to ESD zaps to K2/100s with the KDSP2 installed. Roy Morris W4WFB No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.9.7 - Release Date: 4/12/2005 ___ 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] K2 Audio Loss Due to ESD
On Wed, 13 Apr 2005 16:56:50 -0400, Roy Morris wrote: I have come up with what I think is a better mod for grounding the mike connector The ONLY good place to connect the shield of the mic cable is to the chassis of the K2. I have modified one of my K2's to do this, and will do the other one (newly acquired) soon. When you connect the shield to the circuit board and from there go to the chassis, you set up what we in the pro audio world know as a pin 1 problem. You can find a tutorial on this as part of AES48, an international standard that I helped write. At www.aes.org, go to Standards, then Standards in print, and then select AES48. Anyone can download a pdf of the standard at no charge. If you are not an AES (Audio Engineering Society) member, you won't be able to print the pdf, but you can read it on your screen. You can buy a printable copy for $25. BTW, the chassis is also the right place to connect the signal return of RS232 connections, NOT pin 5. I've solved some serious RFI problems by correcting this. This is a tutorial on the topic. http://audiosystemsgroup.com/FerritesRFI-HamPPT.pdf There are other tutorials on the website that you may find helpful. http://audiosystemsgroup.com/publish.htm Jim Brown K9YC ___ 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
