[CW] Resonant CW Speaker

[stan levandowski]

OK, folks, so I found out my transceiver, a KX2, is NOT "padded" but 
rather has an energy conserving headphone output meant for headphones. 
 The internal speaker (4 ohms, not 8 ohms as specified in the current 
QST article) has an extra amplifier.


So the apparent answer to my situation is to just build a simple little 
mono amp for my resonant speaker.


Other than the volume problem, the CW resonant speaker really does make 
the CW pop, reduces the background crud and is very sharp.  I can make 
my sidetone disappear by moving the slide, that's how sharp it is.



73, Stan WB2LQF


On Mon, Feb 06, 2017 at 08:16 PM, Joe wrote:

> Hello, Stan.
>
> I have not built this particular one, but in the past, I have built a 
> few for friends and myself. The low volume complaints I found came
> from folks using their earphone jacks.  Most radios today have the 
> earphone jack's audio padded down for ear protection.  Once they
> moved the their plugs over to their speaker jacks,  their audio level 
> was plenty high enough.  There are/was a couple of radios that
> had switches go between earphones and speaker which was a padder 
> switch.
>
>
> On 2/6/2017 4:54 PM, stan levandowski wrote:
>> I built the resonant speaker in the current QST.  It "works" in that 
>> I certainly hear the "peak" with my 600 Hz sidetone and I can tune a 
>> CW signal and hear that "peak" also.  However, there is NOT ENOUGH 
>> VOLUME.
>>
>>
>> I used the exact parts that the author used; ordered them all "fresh" 
>> from Amazon so no "junk" from the junkbox was implicated.
>>
>>
>> I figured I had screwed up, so I built a second one, thinking I might 
>> have a speaker anomaly.  The second speaker was the exact same 
>> speaker called for in the article also.  Same exact results.  If I 
>> screwed up at least I was consistent ;-)
>>
>>
>> If anyone builds a resonant speaker that produces sufficient volume, 
>> I'd like to get in on the details.
>>
>>
>> Clearly, I see where resonance has value but I just can't get the 
>> volume I need.
>>
>>
>> I now wonder if the 1/8" centered hole in the plastic was suspect 
>> since the recently posted Youtube video clearly had something on the 
>> order of 1/4" or larger.
>>
>>
>> 73, Stan WB2LQF
>
> -- 
> Regards, Joe, K8JP/V31JP, Ronnie, Marty & Sidney Pontek
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