Good Sam Club Open Roads Forum: Tech Issues: Generator RF Noise
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mustard

Sarasota,FL

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Posted: 01/04/20 06:08pm Link  |  Quote  |  Print  |  Notify Moderator

I just installed a Cobra handheld CB with a firestick antenna behind the left driver's window.

I've notice a very large amount of RF noise when running the generator.

Anyone experience this and can tell me how can I eliminate the RF Noise?





agesilaus

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Posted: 01/04/20 06:14pm Link  |  Quote  |  Print  |  Notify Moderator

I am no electical engineer but I'd think about building a rough Faraday cage out of metal window screen, the fine mesh stuff not hardware cloth.


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Gonzo42

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Posted: 01/04/20 06:38pm Link  |  Quote  |  Print  |  Notify Moderator

A Faraday shield could help, but a good ground connection woouldn't hurt, either.


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BFL13

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Posted: 01/04/20 07:08pm Link  |  Quote  |  Print  |  Notify Moderator

With an inverter (not a generator) the idea was to use a "chassis ground" to the RV frame, separate from the input DC pos and neg wires from the battery (but battery is itself neg grounded to frame--never mind that!)

Another trick is/was to braid the pos and neg input wiree to the inverter to cancel out their effects.

So--with the generator running 120v in the rig to run the CB radio, what is the actual set-up? Is there an inverter involved? Any DC where you can braid the pos and neg wires? The radio must be DC? Is it grounded to frame?


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MrWizard

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Posted: 01/04/20 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

Assuming you mean audio noise you can hear in the CB speaker
What sound does it make
60Hz hum coming from the 120V lines in the wall
Filtered DC hum from the power converter getting in thru the 12v line used to power CB
Or
3600rpm spark plug noise

You don't hear rf interference, RF interference will block / blanket your signal and dampen/reduce what you hear
EMF electromagnetic interference does not have to be in the Radio Frequency spectrum, it just has to be strong enough for circuits to pickup and amplify in the audio output
Our resident HAMS will probably be more helpful

The best way to know what to do to block interference, is to know what the interference noise frequency is

* This post was edited 01/04/20 07:48pm by MrWizard *


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MDKMDK

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Posted: 01/04/20 07:37pm Link  |  Quote  |  Print  |  Notify Moderator

Turn the CB off when you run the generator, and turn the generator off when you're using the CB.


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YC 1

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Posted: 01/04/20 07:41pm Link  |  Quote  |  Print  |  Notify Moderator

These kinds of issues can be a real challenge. So many variables that one could write a book.

An improperly installed antenna connector, ground, or taking voltage from a wire or point that is a long way away from your batteries which are the best filters onboard. As suggested, if your generator is a gas right you could have spark plug noise. Good luck.


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RoyB

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Posted: 01/05/20 07:11am Link  |  Quote  |  Print  |  Notify Moderator

The only RFI I usually get in my OFF_ROAD POPUP setup is coming from my standalone POWER INVERTERs being run off my battery bank. I have a 600WATTS PSW Power Inverter ON all the time running two 120VAC Drop cords with multihead connectors on the end. These two electrical drops are Velcroed to the back of a cabinet top available to use 120VAC items... My Ham radio picks up all kind of RFI noise from this setup...

I have a 1500WATT PSW Power Inverter to use as well but it very seldom turned on... It also will generate a lot of RFI signals. I guess the very expensive Power Inverters like those used in the house UPS UNITS are pretty much RFI free... My House 1000Watt UPS Unit runs all the time with no RFI signals being generated on my Ham radio bands...

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My daily camping off-grid routine is to run all my needs off the battery which require me to run my 2KW Generator each morning for three hours starting at 6am during breakfast to get my battery bank back up to there 90% charge state so I can do all of this all over again for the day/night run off the batteries...

It is a challenge sometimes...

Roy Ken
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* This post was edited 01/05/20 07:17am by RoyB *

PNW_Steve

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Posted: 01/05/20 03:03pm Link  |  Quote  |  Print  |  Notify Moderator

mustard wrote:

I just installed a Cobra handheld CB with a firestick antenna behind the left driver's window.

I've notice a very large amount of RF noise when running the generator.

Anyone experience this and can tell me how can I eliminate the RF Noise?


I would look at common mode chokes on the generator output.

http://www.dellroy.com/W4EF's-Ham-Radio-Page/Portable_Operation/EU2000i_Filter.htm


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time2roll

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Posted: 01/05/20 03:33pm Link  |  Quote  |  Print  |  Notify Moderator

What generator model?


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