[RFI] Multi-Stage High Efficiency Air Conditioner Units

[AA5CT]

 re: " What happened to RF chokes and bypass capacitors, which when 
the correct component values and specifications are used (value, 
current handling and voltage rating), will work better and cost much 
less? "


Fine, if you are the OEM (and can implement those at board level), 
not so fine on a new installation where there is a warranty in effect.

Using the ferrites a service tech can see the "minimal intrusion" the 
ferrites make into the circuitry of the unit (whether on the AC line side
or the thermostat side.) Getting in there to add circuit components to
a control board is a whole 'nother thing.


de AA5CT

.
.

     On Saturday, February 8, 2020, 06:16:12 AM CST, Rob Atkinson <ranchorobbo at gmail.com> wrote:  
 
 First, there's nothing wrong with American Standard as far as I know,
which is a premium brand manufactured in Texas by Ingersol Rand.

Forced air A/C in the home, almost always uses the same air blower
motor that's used by the furnace.  If that's the variable speed
component, you can solve everything by getting an AC motor.  The
variable DC motors are used by people who obsess over a relatively
minor improvement in efficiency.

Why do hams mindlessly use ferrite on everything, including lines that
only have DC on them?  What happened to RF chokes and bypass
capacitors, which when the correct component values and specifications
are used (value, current handling and voltage rating), will work
better and cost much less?

73
Rob
K5UJ
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