Electronics Puzzle -- for the technically minded
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17-07-2015, 06:42 PM
Electronics Puzzle -- for the technically minded
I have a puzzle. It's from real life.

And - I don't have the answer.

In fact -- I'm completely stumped.

I have a battery bank - that I keep charged on commercial power - with a battery charger. I use the batteries to run an inverter - for when the power goes out. (Yeah - I have a generator too -- I'm in the boonies -- it pays to be prepared).

Anyway..... I put the batteries on the charger tonight - because we have some weather coming in -- and might lose power.

We were watching a dvd (Orange is the New Black) -- and it finished -- so I switched over to on the air TV - to see what's on.....

Oddly -- half of the stations were not coming in.

Scratch head, check connections from antenna to TV -- nothing.......

On a hunch -- I go and turn off the battery charger....

All stations are back on.....

WTF???

We did a complete check -- and yup -- half the stations go off - when the battery charger is plugged in......................

Now these are digital stations -- and should not be effected by some random static interference.........

HOW can a battery charging ---- even on low charge (2 amp) cause enough EMF to interfere with a wide range of digital TV stations???????

.......................................

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17-07-2015, 07:11 PM
RE: Electronics Puzzle -- for the technically minded
Electromagnetism works in mysterious waves.

Wink

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17-07-2015, 07:13 PM
RE: Electronics Puzzle -- for the technically minded
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17-07-2015, 07:13 PM
RE: Electronics Puzzle -- for the technically minded
Open ground in the circuit?
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17-07-2015, 08:03 PM
RE: Electronics Puzzle -- for the technically minded
Are you using a powered antenna? Is everything on the same circuit?

Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
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17-07-2015, 10:14 PM
RE: Electronics Puzzle -- for the technically minded
I am a licensed professional electrical engineer... My diagnosis is: turn off the battery charger.

Where should I send the bill?

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18-07-2015, 06:01 AM
RE: Electronics Puzzle -- for the technically minded
(17-07-2015 08:03 PM)Chas Wrote:  Are you using a powered antenna? Is everything on the same circuit?

Yes - and no. (in that order).

They're on separate breakers.

.......................................

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18-07-2015, 06:03 AM
RE: Electronics Puzzle -- for the technically minded
(17-07-2015 07:13 PM)pablo Wrote:  Open ground in the circuit?

Wiring is over 60 years old -- no ground terminal on either...


The only stuff that has ground terminals is the stuff I installed.....

.......................................

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18-07-2015, 07:59 AM
RE: Electronics Puzzle -- for the technically minded
(18-07-2015 06:01 AM)onlinebiker Wrote:  
(17-07-2015 08:03 PM)Chas Wrote:  Are you using a powered antenna? Is everything on the same circuit?

Yes - and no. (in that order).

They're on separate breakers.

Are there common characteristics for the stations you lose?

Are they further away? All in the same general direction? All in one part of the band?

Are there any warnings about interference/EMF in the manual for the charger? You do have the manual, don't you?

Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
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18-07-2015, 08:54 AM
RE: Electronics Puzzle -- for the technically minded
(18-07-2015 07:59 AM)Chas Wrote:  
(18-07-2015 06:01 AM)onlinebiker Wrote:  Yes - and no. (in that order).

They're on separate breakers.

Are there common characteristics for the stations you lose?

Are they further away? All in the same general direction? All in one part of the band?

Are there any warnings about interference/EMF in the manual for the charger? You do have the manual, don't you?

The stations we lose are the ones with the weakest signals. Directionality and frequency don't seem to be a commonality...

And big surprise -- I DO still have the manual -- it's on a string tied to the charger.... Never bothered to take it off. No warnings on it.... But, it was built back in the pre-digital age.........

.......................................

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