[TenTec] POSSIBLE REBUTTAL TO JB

[Clayton Brantley]

I have to agree with your thoughts on switch mode power supplies.  I am a linear
power supply man myself and my thoughts about switch mode supplies is just
simply they belong in the garbage dump.  My station supply is an old GE repeater
supply with a back-up battery.

Name calling will not work here because there are those that know the real facts
and the facts cannot be hidden.

Clayton N4EV





On Sunday, January 19, 2014 3:15 AM, Richards <jrichards at k8jhr.com> wrote:
 
   HI -- I WROTE THIS REBUTTAL TO GOOD OL' JB BUT I DID NOT SEND IT AND 
PROBABLY WON'T - BUT WONDER  IF IT MAKES SENSE AND IF NOT, WHY NOT... 
HE JUST BURNS ME UP WHEN HE BLOWS ME OFF BY SAYING I AM IGNORANT... THAT 
IS NOT AN ARGUMENT, IT IS JUST NAME CALLING...

OHHHHH..... HE BURNS ME UP...

ANY REASON THIS LOGIC IS WRONG?

    Note - Again I did not send it and probably won't
    but I am sick and tired of his being a bully instead
    of a teacher.



    -- JHR  --

----------------------------------------------------------
DRAFT         DRAFT        DRAFT      DRAFT
------------------------------------------------------------

On 1/17/2014 4:43 PM, Jim Brown wrote:

> No, there is a gap in your knowledge of fundamental electricity and
> electronics.


    OK... once again, you tell me I am ignorant, rather
    than explaining it.    One does not need an
    engineering degree to get this.

    
    FACT - switch mode supplies are often noisy.   In fact,
    the new Chinese supplies have a knob to "shift" the
    noise when it adversely affects the operating frequency.
    You can debate whether or not that is "good engineering"
    practice, but there it is.

    FACT - linear supplies seem inherently less problematic,
    and don't seem to have these extra noise controls.

    FACT - historically, when switch mode supplies first
    arrived on the scene, there were many complaints about
    excessive noise - certainly more or different types of
    complaints than hams were expressing about linear supplies.
    
    If switch mode supplies were not inherently noisy, there
    would be no discussion about whether or not "good
    engineering practice" has sufficiently masked, suppressed
    or fixed them to make them useful in the shack.

    Your spin makes it sound like there is no issue or
    problem at all, and I don't accept that.




> No, we simply follow good engineering practice when designing and
> manufacturing the product in question.


    
    OK... I guess what you call "good engineering practice,"
    - I call masking and suppressing noise.  Manufactures
    have "improved" them over time, but I do not believe
    they have done a complete job of it.

    
    FACT - Ten Tec sells switch mode supplies it concedes
    make noise outside the ham bands - rendering them
    useless when using their own general coverage receivers.
    This does not happen with a linear supply.


      So, you can call me ignorant...again... and smother me
    with a vitae of advanced degrees...but the fact is,
    I prefer linear supplies because they seem to be
    inherently less problematic, much quieter and do not
    produce the same noise my TenTec switch mode supply does.

    Paul Clinton admits switch mode supplies are noisy,
    but TT does not care, because they don't make noise in
    the ham bands.  Apparently they are not intended to
    work with their general coverage receivers and other
    radios.

    


> Enough with dumb analogies.  Go to the ARRL Handbook and study the
> fundamentals.


    I read that, and it sounds like switch mode supplies make
    noise that "good engineering pracitce"  is supposed to
    mask or suppress.    But, calling me names does not
    provide an explanation... It takes logic, science, and
    a little patience to accomplish that.

    The discussion is based on the fact that switching
    mode supplies are inherently noisy - or at least more
    noisy than linear supplies.   It did not just arise
    out of nothing.

    Anyone wanna buy my Ten-Tec switch mode power supply ??





>__________________________ JHR ________________________________
_______________________________________________
TenTec mailing list
TenTec at contesting.com
http://lists.contesting.com/mailman/listinfo/tentec