[Elecraft] KX3: popping noise in radio speaker

[Phil Wheeler]

I've not noticed any such sounds, Ed, but my 
hearing is not exactly reference standard.

I'm using Eneloop NiMH and have the optional 
charger so they can stay in the KX3.  So far, so 
good -- though I'm usually on 13.8 VDC or an 
external battery if available.

Phil w7ox

On 5/10/14, 4:55 PM, Edward R Cole wrote:
> While on my trip in the lower-48 I installed 
> batteries in my KX3 for the first time (run it 
> off 13.5v PS in the shack).
>
> I noted that there was a regular popping noise 
> at a regular beat about once per second.  I 
> checked battery voltage and saw that is was 
> below 12v and dropping slowly.  I used eight AA 
> batteries which all tested at 1.53v before 
> installation - brand new out of the package.  
> 8x1.53 = 12.24v but there is loading so voltage 
> started at about 11.9v.  I noted current was 
> running about 250ma with radio in SSB and normal 
> volume level.  I guess the radio draws pretty 
> hard in receive.
>
> I removed the batteries and radio runs normal 
> with 13.5vdc applied.  I guess using 2.2v 
> lithium or NiHD batteries would work better.  I 
> do not intend to run with internal batteries but 
> wondered if anyone else has encountered "popping 
> audio" and is it voltage related?  Or is this 
> related to the speaker physical fit issue with 
> early models of the KX3?  Mine is SN 475 (kit).
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>     "Kits made by KL7UW"
> Dubus Mag business:
>     dubususa at gmail.com