Re: [Elecraft] K3 Speaker cabinet resonances
Thanks to folks who gave specific suggestions again. In my first session, I'd put weather stripping and double stick tape under the cover and on the shield behind the front panel. But I still had a highly irritating buzz in the 330 to 360 Hz range when on the internal speaker. OK, so I took the top cover off again and cranked the sidetone level up to 47, then ran it through the suspect pitch range. The speaker didn't sound too bad if I damped it by holding the magnetic shield, but it was pretty much OK even if I did not do that. So it's something inside the cabinet doing a sing-along. How can I apply excitation to suspect parts and see what's doing it? By leaning the top plate against the cabinet with the magnetic shield touching the top edge, I was able to couple enough audio into the box to make it happen. Turns out one or more of the crystal filters are singing. I have all slots filled and at 350 Hz, the one on the far right is doing Karaoke to the sidetone. When I go to 340 Hz, one or more of the others join in. I'm not sure how to make it/them shut up at this point. It takes significant finger pressure to quiet them down, so a bit of foam strip may not do it. I haven't gone to the bottom to check or tighten the screws yet. I'm going to stew on that a while first. Probably need to remove a filter completely and examine it to come up with a plan. I'm also reluctant to stick things to the tops as I might mess up the labels. 73--Nick, WA5BDU ___ 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 Speaker cabinet resonances
Hi Deni, I had a bit of resonance at 300 & 310 Hz. There is a screw just below the speaker grille that holds the chassis stiffener bar to the top cover. I found that leaving this screw just a tiny bit loose (or perhaps, not tightening it completely would be a better way of saying it) completely eliminates all cabinet buzz on my K3. 73 -- Joe KB8AP On Oct 8, 2008, at 1:59 AM, Deni F5VJC wrote: Has anyone found a solution to the cabinet buzz from the K3 internal speaker? I've not used the internal speaker until recently on my K3 and now find I have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! I haven't tried any damping as yet and just wondered if anyone has managed to cure this cabinet resonance. 73,Deni F5VJC K3 325 -- View this message in context: http://n2.nabble.com/K3-Speaker-cabinet-resonances-tp1306081p1306081.html Sent from the Elecraft mailing list archive at Nabble.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 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 Speaker cabinet resonances
"I tried various things recommend here on the list and I think cabinet buzz is no longer an issue. But I still have a bad resonance or other effect in my built-in speaker itself. In decreasing frequency, it starts buzzing at around 340 Hz, worse at 330 Hz, slight at 320 Hz, and then gone. I pretty much can't use the built-in speaker. At moderate volume levels, even band noise excites those resonances and makes a kind of pulsing, buzzing noise like rough CW." Nick - This sounds the way my speaker sounded. Turns out it was a bad speaker. The way to check this is to remove the speaker from the cabinet and just hold it while it is plugged in. If it is still distorting, get Elecraft support to send you another speaker. Phil - AD5X ___ 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 Speaker cabinet resonances
i too found my speaker buzzy. i fiddled a bit and discovered that the grill cloth had bagged just a bit when i put everything together and was just barely touching the speaker cone edges under certain output conditions. i removed and trimmed it more carefully then made sure it was taut when reassembled. seems ok now. 73 jim ab3cv ___ 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 Speaker cabinet resonances
Thanks to all who responded to this question. Having looked into it further it seems I have a combination of cabinet buzz and a defective speaker. I removed the top panel of my K3 did tests and found the most bothersome buzz at 600/610 Hz is still present with the top panel detached. Checked screws all tight (not too tight) and various other mechanical tweaks but can't clear it. So I guess I will email Elecraft support about a possible replacement speaker. This is a very small annoyance in an otherwise fine radio, and it's just come to light now because I always used external speakers or headphones until now, having reduced my K3 to bare bones due to an impending move of shack, I'm listening to it's internal speaker. 73, Deni F5VJC K3 325 Deni F5VJC wrote: > > Has anyone found a solution to the cabinet buzz from the K3 internal > speaker? > > I've not used the internal speaker until recently on my K3 and now find I > have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! > > I haven't tried any damping as yet and just wondered if anyone has managed > to cure this cabinet resonance. > > 73,Deni > F5VJC > K3 325 > > -- View this message in context: http://n2.nabble.com/K3-Speaker-cabinet-resonances-tp1306081p1307647.html Sent from the Elecraft mailing list archive at Nabble.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 Speaker cabinet resonances
Hello Nick, Sometimes, due to either a manufacturing defect or mechanical shock, the magnet that surrounds the speaker voice coil will get shifted slightly. When that happens, the voice coil may come into contact with the magnet and it can sound pretty bad. Not sure that's what's happening in your case, but I'd suggest trying a replacement speaker. I don't have a K3 so the following recommendation may not be relevant, but I'd also suggest that if you replace the speaker, make a thin felt gasket that you can place between the speakers frame and the cabinet. You can probably go to the local fabric store and ask if they have a small scrap that you can have. Using the gasket should reduce the likelihood of vibration between the speaker frame and the cabinet. Haven't followed this entire thread, so apologies if this is a re-hash of a prior suggestion. 73, Dale WA8SRA Nick-WA5BDU wrote: I tried various things recommend here on the list and I think cabinet buzz is no longer an issue. But I still have a bad resonance or other effect in my built-in speaker itself. In decreasing frequency, it starts buzzing at around 340 Hz, worse at 330 Hz, slight at 320 Hz, and then gone. I pretty much can't use the built-in speaker. At moderate volume levels, even band noise excites those resonances and makes a kind of pulsing, buzzing noise like rough CW. For additional info - I'm not a musical "golden ear", I don't expect high fidelity out of the built-in speaker, and I'm pretty crazy about the K3 overall. Yes, I know I should contact support, but I want to get my facts together and maybe even make some recordings first. 73--Nick, WA5BDU Deni F5VJC wrote: Has anyone found a solution to the cabinet buzz from the K3 internal speaker? I've not used the internal speaker until recently on my K3 and now find I have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! I haven't tried any damping as yet and just wondered if anyone has managed to cure this cabinet resonance. 73,Deni F5VJC K3 325 ___ 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 Speaker cabinet resonances
I tried various things recommend here on the list and I think cabinet buzz is no longer an issue. But I still have a bad resonance or other effect in my built-in speaker itself. In decreasing frequency, it starts buzzing at around 340 Hz, worse at 330 Hz, slight at 320 Hz, and then gone. I pretty much can't use the built-in speaker. At moderate volume levels, even band noise excites those resonances and makes a kind of pulsing, buzzing noise like rough CW. For additional info - I'm not a musical "golden ear", I don't expect high fidelity out of the built-in speaker, and I'm pretty crazy about the K3 overall. Yes, I know I should contact support, but I want to get my facts together and maybe even make some recordings first. 73--Nick, WA5BDU Deni F5VJC wrote: Has anyone found a solution to the cabinet buzz from the K3 internal speaker? I've not used the internal speaker until recently on my K3 and now find I have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! I haven't tried any damping as yet and just wondered if anyone has managed to cure this cabinet resonance. 73,Deni F5VJC K3 325 ___ 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 Speaker cabinet resonances
Hi Deni, I found that placing some tape round the chassis metal work that comes in contact with the top panel completely cured the problem. Certain notes were causing the top panel to vibrate against the top of chassis (no matter how tight the screws were) and having the tape between them dampened the effect. Doug -- View this message in context: http://n2.nabble.com/K3-Speaker-cabinet-resonances-tp1306081p1306802.html Sent from the Elecraft mailing list archive at Nabble.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 Speaker cabinet resonances
Deni, I have used two nuts on each mounting screw. The first nut is very loose, and the second nut is tight against the other one. The screws can be rotated by hand. Two nuts are needed to prevent them from falling into the rig. 73 's Steef PA2A K2 4654 K3 1184 - Original Message - From: "Deni F5VJC" <[EMAIL PROTECTED]> To: Sent: Wednesday, October 08, 2008 10:59 AM Subject: [Elecraft] K3 Speaker cabinet resonances Has anyone found a solution to the cabinet buzz from the K3 internal speaker? I've not used the internal speaker until recently on my K3 and now find I have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! I haven't tried any damping as yet and just wondered if anyone has managed to cure this cabinet resonance. 73,Deni F5VJC K3 325 -- View this message in context: http://n2.nabble.com/K3-Speaker-cabinet-resonances-tp1306081p1306081.html Sent from the Elecraft mailing list archive at Nabble.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 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 Speaker cabinet resonances
Has anyone found a solution to the cabinet buzz from the K3 internal speaker? I've not used the internal speaker until recently on my K3 and now find I have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW! I haven't tried any damping as yet and just wondered if anyone has managed to cure this cabinet resonance. 73,Deni F5VJC K3 325 -- View this message in context: http://n2.nabble.com/K3-Speaker-cabinet-resonances-tp1306081p1306081.html Sent from the Elecraft mailing list archive at Nabble.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
