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@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@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@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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>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
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