[Elecraft] KX3: popping noise in radio speaker

[Don Wilhelm]

Ed,

Were those good quality, name brand batteries?  I have heard similar 
popping noises from audio amplifiers caused by batteries with high 
series resistance.  I have not observed that problem with the KX3, so I 
am just suggesting that the problem may have been the batteries.

73,
Don W3FPR

On 5/10/2014 7:55 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.