[TenTec] On Switching Power Supplies

[Kim Elmore]

Well, yes. But not by intrinsic design in the same way as switching supplies. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

On Jan 17, 2014, at 17:44, george fritkin <georgefritkin at yahoo.com> wrote:

> "linear power supplies can cause noise a very proven fact
>  
> George, W6GF
> 
> 
> 
> On Friday, January 17, 2014 2:44 PM, Kim Elmore <cw_de_n5op at sbcglobal.net> wrote:
> 
> If and only if the sole and singular concern is RF quiet operation, the a linear supply is the only choice. If efficiency plays a role, the you choose the technological path. 
> 
> As an aside, in WWII and the decades that followed -- when CW was the dominant mode and required only a Second Class Radiotelegraph license was needed -- most ships used super regen receivers, even though superhet receivers were significantly better. Why?
> 
> Because submarines couldn't find shops with super regen receivers because they're radio-quiet. 
> 
> It all depends on the operational constraints.  
> 
> Kim N5OP
> 
> "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith
> 
> On Jan 17, 2014, at 13:33, Richards <jrichards at k8jhr.com> wrote:
> 
>>     ER... can we say the same of linear power supplies?
>>     Are they as inherently noisy as switch mode supplies?
>>     Do linear supplies require all that filtering and
>>     modern science to clean up?
>> 
>> 
>> THERE IS A FALLACY LURKING IN THE WEEDS:
>> 
>> 
>>     The gist of the argument is that you can mask,
>>     hide, smother or otherwise suppress the inherent
>>     noise produced by a a switching power supply.
>>     Essentially, the claim is we can render the
>>     cancer benign through surgery.
>> 
>>     But what if a linear supply is inherently quiet
>>     and does not make noise in the first place, then
>>     is there no cancer to hide, mask, smother or
>>     render benign.
>> 
>> 
>> Hmmm.... what do I want ???
>> 
>> An analogous public policy debate rages over public utilities:  do we want more expensive, but inherently clean power;  or do we want cheap, but inherently dirty power, which we hope to clean up or render safer using remedial technology?
>> 
>> Hmmm... what do I want... ?
>> 
>> A noisy switching mode supply rendered benign by modern technology... or a linear supply that is inherently quiet?    Gee that is a difficult decision...  but as a good, cheap ham, I KNOW the less expensive model is the better value... right?
>> 
>> For me it is a no-brainer.  I am willing to pay more for a cleaner, and heavier, power supply, which obviates any concern whether the remedial measures are sufficient or satisfactory to mask or hide the problem.
>> 
>> 
>> 
>>     TEN-TEC CONCEDES ITS SWITCH MODE SUPPLIES MAKE NOISE.
>> 
>> I purchased multiple linear supplies when TenTec acknowledged the Model 963 switch mode supply produces noise outside the ham bands.  T-T Service said it was par for the course, and they only warrant it won't make noise within the ham bands, and I must accept any noise produced outside the ham bands, even if that means it cannot be used with any of my three TenTec receivers for BCB and SW DX-ing !
>> 
>> 
>> Hmmm... what do I want?
>> 
>> Do I want clean power, or cleaned-up power...??
>> 
>> Aw, heck... YOU be the Judge.     ;-)
>> 
>> Happy days.
>> 
>> ----------------------  K8JHR --------------------------
>> 
>> 
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