TenTec
[Top] [All Lists]

Re: [TenTec] On Switching Power Supplies

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] On Switching Power Supplies
From: george fritkin <georgefritkin@yahoo.com>
Reply-to: george fritkin <georgefritkin@yahoo.com>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 17 Jan 2014 15:44:51 -0800 (PST)
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
"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 --------------------------
> 
> 
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec

<Prev in Thread] Current Thread [Next in Thread>