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eHam Forums => Elmers => Topic started by: N4DOV on March 28, 2013, 07:33:42 AM



Title: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 07:33:42 AM
I know there are a lot of posts re this, so I apologise in advance.
Yesterday a continuous noise across all HF bands occurred wiping out reception and it continues today. On my scope it has a "pulse" type quality. Below is link to scope pictures on photobucket. Tried the "AM radio test" which did not help. Advice on what to do is appreciated.
Thanks in advance David N4DOV.
http://i1098.photobucket.com/albums/g372/N4DOV/20130328_100737_zps0cf3e6a1.jpg
http://i1098.photobucket.com/albums/g372/N4DOV/20130328_100728_zps4ae246a1.jpg


Title: RE: Noise...started yesterday
Post by: K5LXP on March 28, 2013, 07:40:57 AM
Step one - is it in your own house?

With the radio operating from a battery, shut off the main breaker and see if it's still there.  Odds are if you're receiving it across a huge swath of spectrum like that it's really close.


Mark K5LXP
Albuquerque, NM


Title: RE: Noise...started yesterday
Post by: K2DC on March 28, 2013, 08:10:37 AM
Those aren't pulses on the scope, they look more like harmonics just a few hundred Hz apart.  I agree with Mark, it's likely pretty close.  Also agree you should try operating battery and kill the house to see if that eliminates it.  If so, then go back and try one breaker at a time to see if you can narrow the source down.

73,

Don, K2DC


Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 08:31:07 AM
Really appreciate the prompt replies. Will be going to borrow battery from a nearby ham shortly. tried to connect to my neighbors(at work) electrical system... but these days they build homes without outside electrical plugs.


Title: RE: Noise...started yesterday
Post by: W5CPT on March 28, 2013, 09:22:29 AM
I would start with the obvious.  What was brought into the house just before the noise started. New phone, TV, modem, etc.  All of these could be the source of the interference.  A local ham has this happen when they installed the new washing machine.  Almost all new appliances use switching power supplies, which can be horrendous when it comes to wide spread noise.  Running off a battery is a good place to start - given that you can eliminate your own house.  I hope it IS in  because it is much harder to find in your neighbor's.

Clint - W5CPT -


Title: RE: Noise...started yesterday
Post by: K8AXW on March 28, 2013, 10:08:26 AM
Another thing to check is removing the antenna and see if the noise is still there.....if you have a beam, swing it 360° and see if the source of noise is a radiated noise like from power lines/equipment and if you can pinpoint a direction.

However, it looks like a plasma TV or something similar.  My one and only problem with radiated noise from my commercial power system had spikes a bit further apart than what you show.



Title: RE: Noise...started yesterday
Post by: KA4POL on March 28, 2013, 11:33:03 AM
Is there a time pattern to the signal? Does the signal become weaker with higher frequencies?


Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 01:24:51 PM
Thanks for further replies.
This is the outcome of my testing:

1.With battery power there is no change. Hooked the battery to my station rig with the bandscope, still as before 59 +40 noise. Then set up a portable operation ,with another radio, in my yard with battery power and a portable antenna - no change also.

2.Connected rig to neighbors electrical system, outside wall plug - no change.

3.My shack is on a different circuit from the house and is fed directly from outside, turning off circuits made no difference.

4.Turned my beam, no directional changes to noise/scope.

5.There is no new equipment/different in my house - for the last 3 years all was good, until yesterday.

6.I live in a relatively new developement. Houses are built setback to setback. The houses on each side of me are empty and for sale (I must add not because of me !!!). My back of the house is "decorated" by the utility company, no work been done there recently and never had a problem before.The highway half a mile from me is under construction, but up till now no problems and they have been at it nearly 2 years. Have not noticed any workers in my neighborhood either.

7. No change with frequency - all are equally affected.

8. Disconnecting the antenna dropped the amplitude on scope as I would expect but the spikes still showed up at the diminished amplitude.

Please help and advise me what my next step/steps should be.
Appreciate all the replies and advice,
David N4DOV.









Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 01:26:27 PM
KA4POL : there is no time pattern - continuous.


Title: RE: Noise...started yesterday
Post by: NK7Z on March 28, 2013, 01:59:43 PM
Thanks for further replies.
This is the outcome of my testing:

1.With battery power there is no change. Hooked the battery to my station rig with the bandscope, still as before 59 +40 noise. Then set up a portable operation ,with another radio, in my yard with battery power and a portable antenna - no change also.

2.Connected rig to neighbors electrical system, outside wall plug - no change.

3.My shack is on a different circuit from the house and is fed directly from outside, turning off circuits made no difference.

4.Turned my beam, no directional changes to noise/scope.

5.There is no new equipment/different in my house - for the last 3 years all was good, until yesterday.

6.I live in a relatively new developement. Houses are built setback to setback. The houses on each side of me are empty and for sale (I must add not because of me !!!). My back of the house is "decorated" by the utility company, no work been done there recently and never had a problem before.The highway half a mile from me is under construction, but up till now no problems and they have been at it nearly 2 years. Have not noticed any workers in my neighborhood either.

7. No change with frequency - all are equally affected.

8. Disconnecting the antenna dropped the amplitude on scope as I would expect but the spikes still showed up at the diminished amplitude.

Please help and advise me what my next step/steps should be.
Appreciate all the replies and advice,
David N4DOV.


I would perform the following tests:

1.  Battery power your radio.
2.  Kill the main breaker to YOUR home.  If the RFI goes away, it is you, which is good...  See notes later.
3.  Kill power to your closest neighbor...  If it goes away it is your neighbor, which is less good...  See Notes later...

That is a good start...  Do you have above ground power, or underground?  What is the highest frequency you can hear it on? 

The fact you get it without an antenna tells me it is VERY CLOSE...  It is probably your house, or a home very close to you...

Why is it good if it is your RFI, because you can stop it all on your own...  Please report back results of tests, and requested data...  Why is it not so good if it is your neighbor?  Because you are not in control of it...



Title: RE: Noise...started yesterday
Post by: N4NYY on March 28, 2013, 03:02:19 PM
Can you set up a fox hunt with a local club, and try to pinpoint a source?


Title: RE: Noise...started yesterday
Post by: WH7DX on March 28, 2013, 03:11:27 PM
How about a portable radio on the lowest AM.   I did that and found that some little items like chargers were making noise at my house... that and my golf cart charger which was VERY noisy. 

Walk down the street?   Get in the car and see where it leaves and picks up again.   Might be able to narrow it down...

$.02

Bryan
WH7DX


Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 03:46:48 PM
NK7Z, Dave: have done the tests.  Went to all 3 of my surrounding neighbors (behind my home is a concrete fence and a road) and switched their power off as well as mine and on battery power made no difference. The noise is on all frequencies from 1.8 to 50 MHz. Power is underground in my neighborhood. Raised electrical wires pass behind my house travelling to/from a substation 1 mile away. Never had any problems till yesterday.None of my immediate neighbors have electrical fences or invisible dog fences.

WH7DX Bryan: did the AM radio walk thing last night made no difference where I was.

N4NYY: Will have to work on getting local club involved.

Interestingly the noise did drop for about 30 or so minutes to half its level. But most of the time it is 59+40.
So my sad tale continues.

Any other advice is much appreciated.
Thanks David N4DOV.


Title: RE: Noise...started yesterday
Post by: NO2A on March 28, 2013, 04:01:29 PM
With a 5/9plus 40db noise source it has to be very close. I`d try driving around your neighborhood with your car on an empty am frequency. Is it a buzzing noise,like power line noise would be?


Title: RE: Noise...started yesterday
Post by: N4NYY on March 28, 2013, 04:10:34 PM
Dave,

Someone on this board was mentioning a new style of gas street light that is noisy for like a half mile. Check into any light if you can get a fix hunter involved. I also believe with the signal strengths, that it is very close.


Title: RE: Noise...started yesterday
Post by: W8JX on March 28, 2013, 04:14:48 PM
These are tuff but my guess based on what has been said and done is power-line noise. I transformer or connection is arcing and radiating through power lines and why coverage is wide with a walk around. Need to stop chasing gremlins and shutting down houses and get power company out there.


Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 05:07:02 PM
W8JX : Thanks for your reply - will be calling the power company in A.M. will try tonight also in case...
N4NYY :  No gas lights in my neighborhood, thanks for your input.

As I said I have significant power lines behind my home, they are just above my back wall.Together with massive road construction(8 lane highway with central lanes which change with rush hour) just less than a half mile from my home.

Again thanks all,
Will post any news.
David N4DOV.


Title: RE: Noise...started yesterday
Post by: NK7Z on March 28, 2013, 06:10:13 PM
W8JX : Thanks for your reply - will be calling the power company in A.M. will try tonight also in case...
N4NYY :  No gas lights in my neighborhood, thanks for your input.

As I said I have significant power lines behind my home, they are just above my back wall.Together with massive road construction(8 lane highway with central lanes which change with rush hour) just less than a half mile from my home.

Again thanks all,
Will post any news.
David N4DOV.

Hello again Dave,

Being underground, I was going to suggest you call the power company, but it looks like you are on that path already!  Good for you!  I would advise you to start a log today.  Log everything you have done, everyone you have spoken too, what their names were, and what was said...  In the event the FCC becomes involved, this goes a long way towards credibility...

I had a very loud RFI source come on one day, and it took me close to a year to track it down...  I am above ground power wiring, and the source was underground power wiring and a block and a half away.  That and I was working at the time, and was putting in 15 hour days for that year kept me from really hitting it hard to locate it...  In any case, the the RFI was moving from the grow lights to the power lines, underground, then back up a pole, and then to my rig via re-radiation, a block and a half away...  A real pain to locate...  Please do post what is happening as this progresses...


Title: RE: Noise...started yesterday
Post by: WH7DX on March 28, 2013, 06:24:05 PM
I'd take the portable radio in the car and do a perimeter of the noise as best as possible.    Go out further until it goes away.  

At night look at the electric lines where there meet the poles.   Binoculars etc..   Any constant arcing....  Small buzzing... 

 Then call the electric company.

I have a power pole to the side of my property.   When it doesn't rain in a while, the salt spray builds up and one of the feed lines arcs to bracket support on wooden pole.   It took a little while to find that one because it wasn't always happening.   That was a sharp +40 pulse and my noise blanket was able to help some when it did happen.    

Has it rained lately?   High winds?   Anything unusual when it first happened?

Satellite shows your location is dense / townhouses - if correct?   Anyone growing weed over there?  ;)


Title: RE: Noise...started yesterday
Post by: NK7Z on March 28, 2013, 06:36:21 PM
Anyone growing weed over there?  ;)
Bingo!  Out of five locates in the past year, 3 were grows...


Title: RE: Noise...started yesterday
Post by: WH7DX on March 28, 2013, 06:55:37 PM
Weed growers...  Classic....  A basement full of sun lamps..

Good sites...

http://www.arrl.org/sounds-of-rfi

http://www.arrl.org/power-line-noise

Some YouTube videos showing power line interference...  Didn't try weed growers.. ;)


Title: RE: Noise...started yesterday
Post by: NK7Z on March 28, 2013, 07:07:19 PM
Weed growers...  Classic....  A basement full of sun lamps..

Good sites...

http://www.arrl.org/sounds-of-rfi

http://www.arrl.org/power-line-noise

Some YouTube videos showing power line interference...  Didn't try weed growers.. ;)
http://www.arrl.org/grow-light-rfi


Title: RE: Noise...started yesterday
Post by: N4DOV on March 28, 2013, 07:52:05 PM
Thanks to all for their input.

WH7DX Bryan : Thanks also. To answer some questions. No rain for about a week, no winds,nothing unusual.
Location is dense with single family homes(500 in developement) with minimal setback between them.Neighbors on each site vacated homes and they are for sale(economic times). Also wonderful ARRL references, thanks. As regards "unusual" horticultural activities - cant be sure, there are a few people who I believe dont/never worked but seem rather affluent, no one knows their income source - it is South Florida you know !.

Addendum: Tonight the noise is at its worst, not that is is ever "good". Again took a walk with the radio (at bottom of AM band) as I walked away from the front of my home it quietened, but when I went under the power lines at back of my house it was louder and very loud near one of the poles near the corner of my home about 100 feet direct line from the shack (? transformer there and lots of ceramic insulators). Feel  stupid not picking this up earlier, noise from road and highway construction will be my lame excuse. Sorry.

Thanks to all. Will keep you posted re Florida Power and Light.


Title: RE: Noise...started yesterday
Post by: WH7DX on March 28, 2013, 08:28:06 PM
No problem...  The main thing is finding out where it might be coming from.    My problem with the pole arcing lead me to try and spray water up and have the wind carry it over to lines to wash salt off.   When I told my electric company that...  They came RIGHT over...   :o

Let us know how it works out. 

73
Bryan
Wh7dx


Title: RE: Noise...started yesterday
Post by: K8AXW on March 28, 2013, 08:45:24 PM
David:  The post about "documentation" is very important.  Be sure to include photos (like the ones you posted)including dates, times and comments. 

I have no idea how responsive your power company will be but ours pretty well ignored our problem until we involved the FCC.  That's when things hit the fan and there were here pretty quick.  However, to really involve the FCC you will need the aforementioned documents to get THEM to move.



Title: RE: Noise...started yesterday
Post by: KA4POL on March 28, 2013, 10:50:02 PM
Do you have a router in your home? If so switch it off to check.
If possible try a second radio to exclude yours.


Title: RE: Noise...started yesterday
Post by: KA1KXL on March 29, 2013, 04:55:41 AM
Just one more note, to anyone looking to track down RFI in the future; shutting down power to the entire home is a great and important first step. When the noise remains then sometimes it can help to try higher frequencies (e.g. harmonics), as they often drop in power with distance much faster than say on the AM-band / long wavelength bands. You can then go out with a portable radio, increasing frequency as you get closer to the source.


Title: RE: Noise...started yesterday
Post by: N4DOV on March 29, 2013, 06:52:22 AM
Thanks again for your replies.
K8AXW: Yes have begun documenting. As regards "responsiveness" I expect I will have to wait and see.
KA4POL: Yes in  my attempts yesterday, I did turn off routers etc and was also was using a portable/battery setup with portable antenna outside in my little garden to run my testing at the same time. Unfortunately did not make a difference.

Addendum: Called FPL who told me it would be investigated by April 11th. Spoke to Supervisor H...... who relayed message to department that is responsible for RFI, requesting them to call me today. Noise really "bad" today.
 


Title: RE: Noise...started yesterday
Post by: NK7Z on March 29, 2013, 07:08:54 AM
Thanks again for your replies.
K8AXW: Yes have begun documenting. As regards "responsiveness" I expect I will have to wait and see.
KA4POL: Yes in  my attempts yesterday, I did turn off routers etc and was also was using a portable/battery setup with portable antenna outside in my little garden to run my testing at the same time. Unfortunately did not make a difference.

Addendum: Called FPL who told me it would be investigated by April 11th. Spoke to Supervisor H...... who relayed message to department that is responsible for RFI, requesting them to call me today. Noise really "bad" today.
 
Remember...  Add every discussion, and contact to your RFI log!  Log when they called, if they called, what they said, when they said they would look, when they looked, what they found, etc...  You can not log enough, nor can I stress how much the log will help later if needed.  Be sure to let the Power company know you have done Power off testing, and where when they arrive.  That will save them some time in testing as well...


Title: RE: Noise...started yesterday
Post by: K8AXW on March 29, 2013, 08:20:28 AM
David: Final comment..... I found out twice that the power company is more responsive when they learn that you know what you're talking about! They're experts at using male bovine effluent (aka. BS) with the public.

This reiterates what 7Z is saying but documenting "everything."


Title: RE: Noise...started yesterday
Post by: N4DOV on March 29, 2013, 08:23:26 AM
Thanks Dave NK7Z : will do as you say. Did tell them about my testing and will repeat it at every opportunity, all has been recorded.Thanks K8AXW will do.
73's David N4DOV


Title: RE: Noise...started yesterday
Post by: W8JX on March 29, 2013, 08:34:42 AM
Thanks Dave NK7Z : will do as you say. Did tell them about my testing and will repeat it at every opportunity, all has been recorded.Thanks K8AXW will do.
73's David N4DOV

Just remember that you will likely get more with sugar than salt here so give power company benefit of the doubt and do not be abrasive.


Title: RE: Noise...started yesterday
Post by: N8NSN on March 29, 2013, 10:48:55 AM
May want to re-post this in the RFI/EMI forum.

As a side note; I found a new source for RFI problems...

A good many of the low-wattage, fluorescent light units are noisy.
In the interest of saving as much on the electric bills many appear to be going to the new fluorescent type low-wattage lights. ESPECIALLY be wary of the ones made in China.
I bought a few six packs of them a couple weeks ago and installed a couple in the shack. On average, four of six emitted 20db over 9 on all my receivers of hash - when within 10 feet of the receivers! I have since replaced these low-wattage units, in the shack, with newer LED lamps. They only consume 2.1 watts of power and deliver the same light as a 25 watt incandescent light, and are quiet as any incandescent light.
Haven't experienced it personally, but have heard some of the Chinese low-watt fluorescent lights have been known to have power supply/ballast blowouts and can lead to house fires!

Side note 2:
My PS/Charger for my laptop PC is extremely noisy, too.

Yes, keep us posted...

If it turns out to be arc faults on the power lines, you'll be happy to know that the power company, no matter how much it appears you're being a PITA to them, want to know about this stuff. A GREAT deal of wasted energy/money is firing off with arc faults. When the problem is rectified (punny) it's a win/win for everyone ;-)

73,
N8NSNjimmie


Title: RE: Noise...started yesterday
Post by: WH7DX on March 29, 2013, 01:26:10 PM
I'm telling ya..  just mention to them that you're trying to wash the lines down to see if it makes a difference and they'll come right over!!    ;D 

Yes.. be nice.. offer some beers, show them the noise (portable AM/FM radio - how the Ham stuff is worthless now).. tell'm that if they don't fix it ASAP you'll be forced to spend more time with your better half!   :-*  and there's some big contests coming up.. ALSO, it's screwing up your RADIO.   Don't forget the radio part and the bunny ears on your TV!   (serious about the AM/FM Radio part).   That's a bigger deal to them then Ham radio (until the FCC gets involved in 9 months?).....

If the K index keeps going up..  we all might be in the same boat this weekend...   ;D



Title: RE: Noise...started yesterday
Post by: N4DOV on March 29, 2013, 03:45:39 PM
Thanks for further replies. As you can see I am monitoring this closely, no ham radio to wile away my time. Actually the XYL wants it sorted out so I dont bother her too much ! ! (wishful thinking). Today worked battery portable from a park 6 miles from the house. No change in noise - appears constant.

News: Power Company will be here at my home on late Monday to assess situation. Will keep you posted.


Title: RE: Noise...started yesterday
Post by: N4DOV on April 01, 2013, 04:02:30 PM
GOOD NEWS: RFI Investigator, Radio Operations foe the Power Company has just completed his visit. Isolated problem to pole behind house and with further testing was able to confirm the problem was a C phase lightening arrestor on the pole. He was happy the I submitted a report of my testing, as most complaints don't - so for that I must thank you all for guiding me through the process. Should be repaired within 2 weeks, which he said is standard .
Again thanks all.
David N4DOV.


Title: RE: Noise...started yesterday
Post by: W8JX on April 01, 2013, 06:08:05 PM
GOOD NEWS: RFI Investigator, Radio Operations foe the Power Company has just completed his visit. Isolated problem to pole behind house and with further testing was able to confirm the problem was a C phase lightening arrestor on the pole. He was happy the I submitted a report of my testing, as most complaints don't - so for that I must thank you all for guiding me through the process. Should be repaired within 2 weeks, which he said is standard .
Again thanks all.
David N4DOV.

Good to hear you have a fix coming. As I said earlier I was sure it was a power line problem based on symptoms.


Title: RE: Noise...started yesterday
Post by: K8AXW on April 01, 2013, 09:11:42 PM
 ;D  Very good David.  Now the next shocker will be when you turn on the rig for the first time after the power pole repair...... and think the radio is dead!


Title: RE: Noise...started yesterday
Post by: WN2C on April 02, 2013, 02:48:11 AM
Hey David, If you can...post a picture to maybe your QRZ webpage of the problem part.  If you can.  Might be helpful for others to see what this bad lightening arrestor looks like.  Glad you got the guy to come out and all will be well in a couple of weeks.  Just be sure to tell us how much a difference in noise there is.

Rick  wn2c


Title: RE: Noise...started yesterday
Post by: N4DOV on April 02, 2013, 06:08:18 AM
In my rush to record the finding of the RFI, I left one major detail out. The RFI Investigator for the Power Company is a RADIO HAM, so I was really fortunate. Below is my take on the process.

The procedure used yesterday, was, first he came to the shack and listened to the RFI on my 2  radios, including the one with the bandscope. Then went outside where the antenna was disconnected at the entrance panel and connected it to a portable testing receiver he had, and the noise was again very obvious. Then we walked the power lines and poles at the back garden of my home and neighbor next door and with a VHF direction finding antenna we located the exact pole. He then used an ultrasonic sound receiver-dish to isolate the faulty C-phase arrestor. Hope this makes sense.

Again I am highly appreciative to all the Elmers on this post for your wonderful help. It is gratifying to know you are out there with your expertise ready to help in situations where hams like me , lack the procedural knowledge. When this first happened my non-ham friends asked me how I was going to get help. I explained I had access to the "brains" of the country! I am proud to be associated with you. I will post again when it is fixed.

73's David N4DOV.


Title: RE: Noise...started yesterday
Post by: NK7Z on April 02, 2013, 06:52:50 AM
GOOD NEWS: RFI Investigator, Radio Operations foe the Power Company has just completed his visit. Isolated problem to pole behind house and with further testing was able to confirm the problem was a C phase lightening arrestor on the pole. He was happy the I submitted a report of my testing, as most complaints don't - so for that I must thank you all for guiding me through the process. Should be repaired within 2 weeks, which he said is standard .
Again thanks all.
David N4DOV.
Very good news Dave...  Congratz!  Be sure to keep a record of this interaction for later...  In the event you need it again, you can ask for the same fellow!


Title: RE: Noise...started yesterday
Post by: K8AXW on April 02, 2013, 09:49:59 AM
I have learned that ANY piece of hardware on a power pole can be a source of RFI if the circumstances are right.  When we consider how much hardware is hanging on a power pole, we should be happy that this kind of problem isn't more prevalent.

I worked in a power plant for 40 years which generated 500v, 4160v and 13.8Kv and had tie-transformers to a commercial system that came in at 138Kv.  It was always interesting to watch this hardware during a rain, especially after a long dry spell.  One always maintained a pucker factor of at least 5.0 while watching this display!  When it was necessary to visit the 138Kv to 13.8Kv substation to reset relays, this pucker factor always ramped up to 10!

QST ran a construction article a few years back on how to build an ultrasonic arc detector that used a small parabolic reflector. This would be very similar to what the power company engineer used to find David's problem. 


Title: RE: Noise...started yesterday
Post by: NK7Z on April 02, 2013, 12:02:53 PM
I have learned that ANY piece of hardware on a power pole can be a source of RFI if the circumstances are right.  When we consider how much hardware is hanging on a power pole, we should be happy that this kind of problem isn't more prevalent.

I worked in a power plant for 40 years which generated 500v, 4160v and 13.8Kv and had tie-transformers to a commercial system that came in at 138Kv.  It was always interesting to watch this hardware during a rain, especially after a long dry spell.  One always maintained a pucker factor of at least 5.0 while watching this display!  When it was necessary to visit the 138Kv to 13.8Kv substation to reset relays, this pucker factor always ramped up to 10!

QST ran a construction article a few years back on how to build an ultrasonic arc detector that used a small parabolic reflector. This would be very similar to what the power company engineer used to find David's problem. 

Many many years ago, (about 45 years), prior top my wife and I being married, we used to drive out in the woods to neck...  Happens that our favorite place was under a High Tension line...    Often when it rained after a dry spell, we could both hear and see the wires at night...  This spot was on a hill looking down a valley, and the High Voltage wires ran down hill for about two miles, in a very clear area...  The wires were glowing a purple/violet color...  Very cool...

Now that I am older, I have built one of those Ultrasonic detectors...  It work fairly well...  I have two reviews, one for the Ultrasonic device, and one for the MFJ three element RFI locator at:
http://nk7z.net/category/info/mitigation-of-rf-interference/
These reviews cover my general feelings towards these devices...


Title: RE: Noise...started yesterday
Post by: K8AXW on April 03, 2013, 09:45:54 AM
Dave: 

Quote
Many many years ago, (about 45 years), prior top my wife and I being married, we used to drive out in the woods to neck...  Happens that our favorite place was under a High Tension line...    Often when it rained after a dry spell, we could both hear and see the wires at night...  This spot was on a hill looking down a valley, and the High Voltage wires ran down hill for about two miles, in a very clear area...  The wires were glowing a purple/violet color...  Very cool...


Wow..... as I seem to recall..... given the same same circumstances.... I doubt if I would have noticed a July 4 fireworks display!   ::)   LOL.


Title: RE: Noise...started yesterday
Post by: NK7Z on April 04, 2013, 10:30:25 AM
Dave: 

Quote
Many many years ago, (about 45 years), prior top my wife and I being married, we used to drive out in the woods to neck...  Happens that our favorite place was under a High Tension line...    Often when it rained after a dry spell, we could both hear and see the wires at night...  This spot was on a hill looking down a valley, and the High Voltage wires ran down hill for about two miles, in a very clear area...  The wires were glowing a purple/violet color...  Very cool...


Wow..... as I seem to recall..... given the same same circumstances.... I doubt if I would have noticed a July 4 fireworks display!   ::)   LOL.

Snicker...  Once a geek...  Always a geek...  :)


Title: RE: Noise...started yesterday
Post by: N4DOV on April 08, 2013, 01:10:34 PM
I have had quite a bit of idle time since this all arose, I began to look at a number of things.
Firstly, I discovered it is NOT a C phase lightening arrester, but a THREE phase lightening arrester. Read up a bit to understand what this is and I think this has given me some perspective :

http://en.wikipedia.org/wiki/Three-phase_electric_power
http://en.wikipedia.org/wiki/Lightning_arrester

Am still confused if it is arrestOr or arrestEr !

Went to the back of the house and took this picture of the pole with the culprit arrester/arrestor and one of these ceramic/polymer objects, I assume is my problem :

http://i1098.photobucket.com/albums/g372/N4DOV/lighteningarrestors_zpsb5bc06fe.jpg

Well I also made of video of site and sound of the noise, together with how my 2 great radios handle THIS noise via their Noise Blanker capabilities, in this instance. I apologise for the shaky nature of the video but as soon as youtube have stabilised the video, I will repost the link.

http://www.youtube.com/watch?v=Si26cABHa9s

Again thanks to all and will update if problem resolved.
73's David N4DOV.


Title: RE: Noise...started yesterday
Post by: WH7DX on April 15, 2013, 11:29:28 AM
Anything yet Dave?    Curious.

Bryan.


Title: RE: Noise...started yesterday
Post by: N4DOV on April 15, 2013, 03:46:08 PM
Nothing yet. Tomorrow will be 2 weeks, which the Power Company said it would take to attend to it !
Did call the Power Company who confirmed my work-order  and then put me through to the unit responsible to fix it, got a recorded message to leave a message.


Title: RE: Noise...started yesterday
Post by: N4DOV on April 16, 2013, 10:04:28 AM
Good news !  ;D ("mostly"). Work was completed, details not available and have asked for someone from Power Company to call me. The RFI rate of impulse has significantly improved - gone from machine gun rate to old fashioned type writer rate (that rate is if I was typing !). Pictures below for before and after. Have called and emailed RFI Investigator to see if we can get further improvement. My ICOM 7600 can now handle this noise better, the Tentec Eagle never had a problem handling the noise from the beginning.

Impressed with Florida Power and Light for their RFI Investigator and for completing the work in their estimated time, especially with all the rain we have been having. Hopefully we can get the last remnants of the noise eliminated.

Again thanks to all for their help. It is wonderful to know out there,there are people ready to help the "hapless".

73' s David N4DOV


Below the before and after bandscope pictures.

http://i1098.photobucket.com/albums/g372/N4DOV/20130328_100737_zps0cf3e6a1.jpg

http://i1098.photobucket.com/albums/g372/N4DOV/rfifollowup_zps84f9c87f.jpg


Title: RE: Noise...started yesterday
Post by: WH7DX on April 16, 2013, 07:57:10 PM
Good to hear  ;D   

I just got WAV files working with the SignaLink USB / TS-570 and N1MM.  Also got it working with RTTY and Software. 

That should save my voice!   Now I need to get some macros working with DXKeeper and WinWarbler and learn the Digital software which looks pretty cool.

73!

Bryan
WH7DX