Noise on all bands, coming and going away

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  • Updated 2 weeks ago
I have 6600 for about 2 months. Last 2 weeks I experience a lot of intermittent noise that affect all bands.
I tried different Power Supply (even I do not believe it is related), tested on Steppir, 6m monoband and RX antenna.
I believe it is a local noise as some friends on 80m do not hear it.
NB does help in a middle of the scale, WNB - does not.
Here are few examples, let me know someone have any idea how to deal with that.
Thanks
Sergey, KN7K

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Sergey Abrikosov

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Posted 2 weeks ago

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Sergey Abrikosov

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here is 6m.
Noise could be up to 5-10min and going away.
Comes back in some unpredicted time, did not catch any cycles yet

(Edited)
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Sergey Abrikosov

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10mhz zoomed in

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Steve

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I would look for something in your house that is generating RFI. I had a handtool battery charger that was real noisy. 
The long process is to get a portable radio where you can hear the noise, turnoff all of your breaker in your ac breaker box and turn them on one by one until the noise comes back. and then go find what is on that breaker.
dont forget about things on UPSs that wont go off with the dead breakers :)
Steve WS5W
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WX7Y

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If you have a early version (around May) of the 6600 have you had the factory Mods done? 

Does it do it when the radio has been on for a while or all the time as soon as it is powered up?

does it do it on a dummy load?

73's
Bret
WX7Y


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Sergey Abrikosov

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thanks Steve and Bret.
Well, I have a battery but not sure how to catch it.
I saw it today several times for 5-10min and now it is all good.
Radio made in July, so mode suppose to be done
Here is the image at the moment - all good.

By the way, no new devices in the house lately.
I connected dummy load to delta switch, next time Noise comes back, I will check it. Thanks
Sergey, KN7K



(Edited)
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Sergey Abrikosov

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ok, noise came back, I switched to a dummy load and it is clean.
It seems like it is coming from antenna, any antenna.

here is image below - yellow is antenna, no signal (blue) is a dummy load.


(Edited)
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David Decoons wo2x, Elmer

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Maybe a charger that is cycling on & off to top off the charge 9n a battery?
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hans weijers

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I had exactly the same picture on the screen of my Flex6500 and the source proved to be a HP laptop charger about 60 meters away. The charger was found with the help of the Agency of Telecommunications after my complaint.Exchanging the charger, which was overheated !, for a decent one brought the solution. So the generator of the RFI interference can be quite a while away from the antenna. So anywhere in the neighbourhood could be a hard to find source of interference. Hans PA0HWB
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Mark WS7M

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Yikes!

Follow the advice and see if it is somewhere in your home.  If not then you need to go on a hunt.

I am pretty sure that this:


Is not something in my home.  If I switch antennas to an end fed wire that is north of the home I think is causing this it goes away.  Antenna port does not matter, must antenna and this beast moves around on the band and is repeated.


So I was told when I got into SDR:

The good thing about an SDR is you can see the band.  The bad thing about an SDR is you can see the band!

These things were probably always there in my home years ago.  I just tuned past them not knowing what they they were.
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Rick - W5FCX

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As was suggested, the next time the noise starts, use 12 V battery power and turn your main house breaker off. If the noise goes away, it’s in your house. You need to verify this first instead of making assumptions.

If it goes away, then turn all breakers off and main power back on, then turn each breaker on one at a time until the noise comes back. I did this a few years ago and narrowed the problem down to an old laptop wall wart on in my wife’s office that she turned on occasionally. Replaced it with one that doesn’t radiate - problem solved.

If it turns out to be external to the home, you will need a directional receiver (MFJ have some mighty fine j@@k for that, as do others).

It’s very annoying but something you will have to track down or it will likely haunt your radio from now on. Many of us have been through this. Sorry it’s your turn. Just part of the hobby.
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Sergey Abrikosov

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Thanks guys for all suggestions, I will check it on battery next time and will go through circuit breakers. Do not have time this weekend , but will try next week.
Sergey, KN7K