Buzzy K2 speaker

My K2 had a very irritating buzz (sympathetic vibration) at about 400 hz.  I noticed if I pressed on the top cover, it quit.  No amount of adjusting the four speaker mounting screws worked.  That ruled out the speaker itself, I reckoned.  So, I took the top off, turned it upside down and put pieces of "Q Pad around the speaker, covering most of the vacant area.   Hot dog!   Buzz went away.  
 
Q Pads are +/- 3/32 inch thick fibrous pads with one sticky side, are used in cars to quieten vibrating panels and can be found at professional auto paint stores.  Used 'em on my old Ford diesel and quietened it down.  CAVEAT:  Since the pads are kinda heavy, and are hanging from the top panel, I can't vouch for how long they will stay stuck.  They did stay stuck to the bottom of my old diesel's oil pan for years and may still be there.  I traded the truck.   However, they work so well if they drop down, I will figure some way to hold em up.  My ohmmeter says they are nonconductive.  The pads come in packs of several roughly 10" sq pads.  Maybe a friendly hot rod shop would sell just one, which is more than enough area.
 
Another idea is to affix 1/8 in thick aluminum pieces with contact cement.
 
73 from N4YM, George  
 
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[Stewart Baker]

I think that if the battery is fitted that gives a degree of rigidity to the top
panel, and damps down any vibrations. On my K2 with no battery I used a piece of
thick felt glued to the inside of the top cover. Works a treat.

73
Stewart G3RXQ
On Mon, 20 Feb 2006 22:33:00 GMT, [hidden email] wrote:

> My K2 had a very irritating buzz (sympathetic vibration) at about 400 hz.  I
> noticed if I pressed on the top cover, it quit.  No amount of adjusting the
> four speaker mounting screws worked.  That ruled out the speaker itself, I
> reckoned.  So, I took the top off, turned it upside down and put pieces of "Q
> Pad around the speaker, covering most of the vacant area.   Hot dog!   Buzz
> went away.
>
> Q Pads are +/- 3/32 inch thick fibrous pads with one sticky side, are used in
> cars to quieten vibrating panels and can be found at professional auto paint
> stores.  Used 'em on my old Ford diesel and quietened it down.  CAVEAT:
> Since the pads are kinda heavy, and are hanging from the top panel, I can't
> vouch for how long they will stay stuck.  They did stay stuck to the bottom
> of my old diesel's oil pan for years and may still be there.  I traded the
> truck.   However, they work so well if they drop down, I will figure some way
> to hold em up.  My ohmmeter says they are nonconductive.  The pads come in
> packs of several roughly 10" sq pads.  Maybe a friendly hot rod shop would
> sell just one, which is more than enough area.
>
> Another idea is to affix 1/8 in thick aluminum pieces with contact cement.
>
> 73 from N4YM, George
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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: [hidden email]
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