"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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