Re: Indoor apartment antenna rfi
TNX 72/73 DR TIMOTHY-ALLEN ALBERTSON
KD?OIA/(ex KG6IRH)
?
LEDs are semi-conductors and can produce noise, like a noise generator.?
Without proper bypassing and such, they can be quite the noise generators
like any diode.? I suspect in your case, there may be many sources
combined.
Like one suggestion, if you can run your radio off of a battery, cut all
the power to your apartment by the circuit breakers.? Then bring the
power back
up, one circuit at a time and then back off while you listen for the
noise in your receiver.? You may hear the noise reappear, either
partially or full boar.
That can help isolate it if it is coming from your apartment.? It may be
there with the power all off, suggesting it is from a source outside of
your apartment.
This is just a starting point for you to isolate the source or sources
of the nose.
73, Joe, K8JP/K5
On 6/23/2019 11:32 PM, 'markaren1@...' markaren1@... [FT817] wrote:
> Guys LEDs generally do not produce wide band hash unless they are
> smart dimmable?or are some kind of array.? Many of the sources
> suggested will produce noise on a particular frequency or band but
> wide band noise on all bands
> Is something else.? Old cfl?fluorescent bulbs were notorious for
> noise.? Aquarium heater were also bad, but you could tell easily as
> they had a glowing neon lamp in the heater.? Switching supplies
> (computers have these) will generate noise when you are close to them.
> I have to ask is the noise still present if you remove the antenna??
> If so, you might have nose entering the radio from nearby equipment.
> Al wb9uvj
> Sent from my HTC
--
Regards, Joe, K8JP/V31JP, Ronnie, Martin & Sidney Pontek
175 Diamond Loch Rd., Apt. 5
Gilmer, TX 75644-9374
U.S.A.
or
P.O. Box 280, Dangriga, Stann Creek District
(Hopkins Village) Belize
903-204-2318 (My TX cellular)
903-884-5990 (Skype telephone number, Belize & TX)
Also, K8JP, member FOC-1743, QCWA-LM21894, OOTC-4607, A1OP, SKCC-3171T, NAQCC-5798, Flying Pig-2819, FISTS-7625CC951, A1C-2299, SOC 1075, 10-10 22977, PG1915841, CW Rag chewers #21,
Facebook: Joe Pontek
Skype: v31joepalooka
I am looking for Vibroplex Model X, Double lever and prefer basket cases to restore.
LotW
|
Re: Indoor apartment antenna rfi
LEDs are semi-conductors and can produce noise, like a noise generator.? Without proper bypassing and such, they can be quite the noise generators
like any diode.? I suspect in your case, there may be many sources combined.
Like one suggestion, if you can run your radio off of a battery, cut all the power to your apartment by the circuit breakers.? Then bring the power back
up, one circuit at a time and then back off while you listen for the noise in your receiver.? You may hear the noise reappear, either partially or full boar.
That can help isolate it if it is coming from your apartment.? It may be there with the power all off, suggesting it is from a source outside of your apartment.
This is just a starting point for you to isolate the source or sources of the nose.
73, Joe, K8JP/K5
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On 6/23/2019 11:32 PM, 'markaren1@...' markaren1@... [FT817] wrote: Guys LEDs generally do not produce wide band hash unless they are smart dimmable?or are some kind of array.? Many of the sources suggested will produce noise on a particular frequency or band but wide band noise on all bands
Is something else.? Old cfl?fluorescent bulbs were notorious for noise.? Aquarium heater were also bad, but you could tell easily as they had a glowing neon lamp in the heater.? Switching supplies (computers have these) will generate noise when you are close to them.
I have to ask is the noise still present if you remove the antenna?? If so, you might have nose entering the radio from nearby equipment.
Al wb9uvj
Sent from my HTC
--
Regards, Joe, K8JP/V31JP, Ronnie, Martin & Sidney Pontek
175 Diamond Loch Rd., Apt. 5
Gilmer, TX 75644-9374
U.S.A.
or
P.O. Box 280, Dangriga, Stann Creek District
(Hopkins Village) Belize
903-204-2318 (My TX cellular)
903-884-5990 (Skype telephone number, Belize & TX)
Also, K8JP, member FOC-1743, QCWA-LM21894, OOTC-4607, A1OP, SKCC-3171T, NAQCC-5798, Flying Pig-2819, FISTS-7625CC951, A1C-2299, SOC 1075, 10-10 22977, PG1915841, CW Rag chewers #21,
Facebook: Joe Pontek
Skype: v31joepalooka
I am looking for Vibroplex Model X, Double lever and prefer basket cases to restore.
LotW
|
Re: Indoor apartment antenna rfi
I glean from what has been said is that an LED light supplied by a 5v power cord supplied by a 12v battery should not cause much RFI.? If I am incorrect, please disabuse me of my error. 72/73 DR TIMOTHY-ALLEN ALBERTSON
KD?OIA/(ex KG6IRH)
?
Guys LEDs generally do not produce wide band hash unless they are smart dimmable?or are some kind of array.? Many of the sources suggested will produce noise on a particular frequency or band but wide band noise on all bands Is something else.? Old cfl?fluorescent bulbs were notorious for noise.? Aquarium heater were also bad, but you could tell easily as they had a glowing neon lamp in the heater.? Switching supplies (computers have these) will generate noise when you are close to them. I have to ask is the noise still present if you remove the antenna?? If so, you might have nose entering the radio from nearby equipment.?? Al wb9uvj
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Re: Indoor apartment antenna rfi
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Re: Indoor apartment antenna rfi
LEDs them selves do not produce RFi. The culprit is the power circuit in the LED housing that converts the AC to DC. Practically ALL new radios are lit with LEDs. If they produced RFi, they would not be used. Also the light emitted from the LED chip is produced by movement of photons not radio frequency. Just wanted to clarify the statement that the other person stated. Tom KC7BJE
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Re: Indoor apartment antenna rfi
Yes! LED¡¯s can be a huge source of rfi.
Wayne
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On Jun 23, 2019, at 8:12 PM, Timothy-Allen Albertson kd0oia@... [FT817] < FT817@...> wrote:
?
Would LEDs cause this? 72/73 DR TIMOTHY-ALLEN ALBERTSON
KD?OIA/(ex KG6IRH)
?
Randy,
High noise across the bands is unusual unless there is something causing widespread hash.? Often these come from neon signs or plasma TVs both not often found in apartments these days.? Loop antennas are more sensitive broadside to the loop so if your loop goes around the room, then the noise is likely above or below you.? Dimmers can also produce a lot of hash but are usually not on all the time.? So if the noise comes and goes during the day that might give you a hint.? Do you have a ceiling fan in this room?? Does it have a remote control?? If so, you might try turning off the power to it.
Al Skierkiewicz
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Re: Indoor apartment antenna rfi
Big offenders I have found across our bands are:
Ccfl bulbs
LED lamps
Static Air Purifiers (furnace or portable)
Wall Chargers ****
Cheap Radios
Garry
W9WHF
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Re: Indoor apartment antenna rfi
Would LEDs cause this? 72/73 DR TIMOTHY-ALLEN ALBERTSON
KD?OIA/(ex KG6IRH)
?
Randy,
High noise across the bands is unusual unless there is something causing widespread hash.? Often these come from neon signs or plasma TVs both not often found in apartments these days.? Loop antennas are more sensitive broadside to the loop so if your loop goes around the room, then the noise is likely above or below you.? Dimmers can also produce a lot of hash but are usually not on all the time.? So if the noise comes and goes during the day that might give you a hint.? Do you have a ceiling fan in this room?? Does it have a remote control?? If so, you might try turning off the power to it.
Al Skierkiewicz
|
Re: Indoor apartment antenna rfi
My suggestion: switch off every electrical appliance in your appartement. ?Switch off every fuse so that there is no electrical power in your appartement. With your FT-817 you are still able to receive. If you hear no noise than your own equipment causes the noise. If you still have the same noise level the source should be somewhere outside of your appartement.? Vy 73 de Rolf, DL8BAG Rolf Schr?der Tel.: + 49 170 21 07 14 3
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?
Could be a bad wall wart psu
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Re: Indoor apartment antenna rfi
Could be a bad wall wart psu
On 23 Jun 2019 19:55, "'Al Skierkiewicz' markaren1@... [FT817]" <FT817@...> wrote:
?
Randy,
High noise across the bands is unusual unless there is something causing widespread hash.? Often these come from neon signs or plasma TVs both not often found in apartments these days.? Loop antennas are more sensitive broadside to the loop so if your loop goes around the room, then the noise is likely above or below you.? Dimmers can also produce a lot of hash but are usually not on all the time.? So if the noise comes and goes during the day that might give you a hint.? Do you have a ceiling fan in this room?? Does it have a remote control?? If so, you might try turning off the power to it.
Al Skierkiewicz
|
Re: Indoor apartment antenna rfi
Randy,
High noise across the bands is unusual unless there is something causing widespread hash.? Often these come from neon signs or plasma TVs both not often found in apartments these days.? Loop antennas are more sensitive broadside to the loop so if your loop goes around the room, then the noise is likely above or below you.? Dimmers can also produce a lot of hash but are usually not on all the time.? So if the noise comes and goes during the day that might give you a hint.? Do you have a ceiling fan in this room?? Does it have a remote control?? If so, you might try turning off the power to it.
Al Skierkiewicz
|
Re: Indoor apartment antenna rfi
[image: IMG-20190623-WA0012.jpg]
The photo of my magnetic loop antenna that I use in the window of the 11th
floor has 12 floors.
Works well.
Pu2olt oliveira
Oliveira PY2-255SWL
Call Sign PU2OLT
RX Morphy Richards 27024
RX/TX YAESU FT817D
RX/TX YAESU FT897D
Blog:
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Re: Indoor apartment antenna rfi
Friend I live in 11th floor apartment too and I have a Yaesu FT817 and FT897, both I use a Magnetic Loop antenna. I get good contacts near the window. See the antenna that I use in: This LoopMagnetic is very good. Oliveira PU2OLT Sao Paulo-SP Br ?
Oliveira PY2-255SWL
Call Sign PU2OLT RX Morphy Richards 27024 RX/TX YAESU FT817D RX/TX YAESU FT897D Blog:
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Re: Indoor apartment antenna rfi
You can solve half the problem (the receiving half) by using one of the online receivers at websdr.org.? I am currently listening to field day traffic using the Northern Utah WebSDR #2.? A good antenna in a low radio noise location.? When the S8+ noise level starts to drive you crazy, listening with the WebSDR is like a breath of fresh air.
What is cool about this is the WebSDR streams the whole band to you and you use the application to tune the receiver across this band.? Many people can be listening at one time, all tuned to different frequencies.
73 de KH6IDF
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Re: Indoor apartment antenna rfi
Concur!? Apartment operation sucks.? The ultimate solution is to move.
Some relief might be had.? Run your radio on battery power and pull your main breaker.? If your noise level is significantly reduced, there may be some relief found in cleaning up your own noise generators.? If the noise remains high, your neighbors are your main noise source.? You might ask them to work with you to reduce noise.? But that can become a problem too.
Although my home location is very quiet, I enjoy portable operations myself.? Just yesterday I was up on the highest summit in Northern Bavaria, making contacts on 40m-30m-20m.? Some of the signals were S-0, but the contact was completed.
Good luck.
Vy73 -- Mike -- DL/KD5KC
Rhon Mountains
Strahlungen Germany
On Sat, Jun 22, 2019 at 9:26 PM -0600, "af4o@... [FT817]" <FT817@...> wrote:
I hear some have success with a magnetic loop antenna. MFJ has
one or you can build. Turn it to null the noise may help.
Apartments are a soup of rfi generators. I suspect that there is a
way to make an antenna work somewhere in your situation to a
certain extent. Do you have a balcony? Move the antenna to
different places and try. Geez the way the bands are (lack of
sunspots), even those with tower based antennas are finding
conditions somewhat challenging.
Consider doing some hamming in the great outdoors. A park away
from the rfi can yield a zero noise floor with an antenna thrown
up in a tree. Nothing like being in the middle of a local forest
or large park away from all noise, you will be amazed at what you
can hear.
73
Chuck
AF4O
?
I live in an no outside antenna apartment.
I have a loop near the ceiling.? I have s8+ noise on my
ft897d.? Any suggestions? 75m-6m
Randy ka4nma
|
Re: Indoor apartment antenna rfi
I hear some have success with a magnetic loop antenna. MFJ has
one or you can build. Turn it to null the noise may help.
Apartments are a soup of rfi generators. I suspect that there is a
way to make an antenna work somewhere in your situation to a
certain extent. Do you have a balcony? Move the antenna to
different places and try. Geez the way the bands are (lack of
sunspots), even those with tower based antennas are finding
conditions somewhat challenging.
Consider doing some hamming in the great outdoors. A park away
from the rfi can yield a zero noise floor with an antenna thrown
up in a tree. Nothing like being in the middle of a local forest
or large park away from all noise, you will be amazed at what you
can hear.
73
Chuck
AF4O
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?
I live in an no outside antenna apartment.
I have a loop near the ceiling.? I have s8+ noise on my
ft897d.? Any suggestions? 75m-6m
Randy ka4nma
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Re: Indoor apartment antenna rfi
My correct email Is ka4nma at .
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Re: Indoor apartment antenna rfi
Thanks for the info.? Any others?
Hi, Randy.
Your issue is two-fold, at least. Your RX noise issue may benefit from some investigation. A larger issue is what RFI/EMI do you introduce into your neighbor¡¯s electronic equipment? You¡¯re looking at near- field magnetic insults from your transmitter into their stuff.
Happy to chat:
919-971-3100
73,
Tom N4TAB
> On Jun 22, 2019, at 21:36, Randy Davenport <pastor.spaceboy@...> wrote:
>
> I live in an no outside antenna apartment. I have a loop near the ceiling.? I have s8+ noise on my ft897d.? Any suggestions? 75m-6m
> Randy ka4nma
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Indoor apartment antenna rfi
I live in an no outside antenna apartment. I have a loop near the ceiling.? I have s8+ noise on my ft897d.? Any suggestions? 75m-6m Randy ka4nma
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Inrad is still in business but they have a limited supply of the out of production
mechanical filters.? Check their listing on the website.
Travis?
K5HTB
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Al WB9UVJ
Clyde Lambert
Rolf Schroeder
PY2255 SLW