[TenTec] High speed washer hum/whine

[Gary Hoffman]

A brute force line filter for the power line.  In older versions of the ARRL 
handbook a circuit was published for years which was simple to build in an 
evening.  I built and used them with early computers....which were massively 
sensitive to power line noise !  Worked very effectively.

If you don't have an old handbook I bet someone here does and can offer a 
scan of the page with the circuit.  It had two choke coils that you wind, 
and 5 or 6 common capacitors, as I recall it.

73 de Gary, AA2IZ


----- Original Message ----- 
From: "Kris Merschrod" <Kris at merschrod.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Wednesday, February 03, 2010 2:23 PM
Subject: [TenTec] High speed washer hum/whine


> Good afternoon all,
>
> Here is a powersupply problem that needs a neat fix.
>
> When my wife runs the highspeed washing machine, the whine and hum goes up
> and down and also off and on when I am on my trusty Delta II.  The power
> supply is the # 936.  Grounding all around.
>
> When I run my old Drake, with AC-4 power supply - theer isn't a hum or
> whine. (My gues would be the L-C filters on both neg and pos AC Lines.
>
> Suggestions Please.
>
> Kris KA2OIG
> Merschrod
> 123 Warren Road
> Ithaca, NY 14850
> www.merschrod.net
>
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