[OKDXA] Radios and noise

Steve Duskin sduskin at gmail.com
Fri Jan 27 09:59:04 EST 2017 

What I found in my shack that was causing noise...
- space heater
- CFL lights
- AC to DC power adapters (wall warts) for various pieces of PC and radio gear
- the 20w LED (AC powered) I was using to light my shack area
- the ionizer air cleaner on my central air system
- plasma TV on the other side of the shack wall (in the living room)
- and finally the family dogs when they want my attention!  :)

73

-Steve.
NE5SD

-----Original Message-----
From: OKDXA [mailto:okdxa-bounces at mailman.qth.net] On Behalf Of GARYLM at kiamichiwb.org
Sent: Thursday, January 26, 2017 12:18 PM
To: Oklahoma DX Association <okdxa at mailman.qth.net>
Cc: okdxa at mailman.qth.net
Subject: Re: [OKDXA] Radios and noise


IF YOU HAVE A LAPTOP COMPUTER, AND USE AC TO RUN IT AT YOUR STATION.  TRY UNPLUGGING IT
AND SEE IF NOISE GOES AWAY.   I HAVE A LAPTOP AND IF I PLUG IN THE EXTERNAL POWER CARD
IT RAISES MY NOISE BY 5 OR 6 S-UNITS.  FOUND OUT I COULD NOT USE IT IN SHACK ON EXTERNAL
POWER.
GOOD LUCK  SOME TIMES THESE NOISE SOURCES ARE HARD TO FIND.   I AM IN RURAL AREA SO DO
NOT HAVE MUCH HERE TO WORRY WITH EVEN MY PLASMA TV DOESN'T CAUSE ANY NOISE.
73 WQ5R GARY

--- af5cc2 at gmail.com wrote:

From: John Geiger <af5cc2 at gmail.com>
To: Coy Day <n5ok at arrl.net>, Oklahoma DX Association <okdxa at mailman.qth.net>
Subject: Re: [OKDXA] Radios and noise
Date: Wed, 25 Jan 2017 12:11:53 -0600

I didn't find any noise source in my house today switching on and off circuit breakers.

73 John AF5CC

On Wed, Jan 25, 2017 at 9:58 AM, Coy Day <n5ok at arrl.net> wrote:

> Also check out any fluorescent lights you might have.  I found that to 
> be a problem here once.
>
> --
> Coy Day, N5OK
> 20685 SW 29
> Union City, OK 73090
> 405-483-5632
>
>
>
>
> John Geiger wrote:
> > Hi Bob,
> >
> > Thanks for the info.  I did listen today during the day on 40m and 
> > it was still about the same.  Guess it is time to see if it is 
> > anything in my house causing it. Will probably do that tomorrow 
> > morning.  I was able to rule out the wireless router and desktop 
> > computer today, though, as a source of noise.
> >
> > 73 John AF5CC
> >
> > On Mon, Jan 23, 2017 at 7:20 PM, Robert Redmon <k5sm.bob at gmail.com>
> wrote:
> >
> >> John, I live in a rather (rf) quiet place several miles from town 
> >> and suffer from very little power line noise and my nearest 
> >> neighbor is several hundred feet away. The noise you hear on 40 
> >> meters is not abnormal for times when the band is open. Currently 
> >> on my dipole at 65' using either my
> >> K3 or my Flex 5k, the ambient noise on ssb (2.4khz filter) is S5-S6.
> >> During
> >> the day, it will fall to much lower levels.
> >>
> >> Bob
> >>
> >> On 1/23/2017 7:07 PM, John Geiger wrote:
> >>
> >>> I know if you buy a more expensive radio, you get a receiver that
> >>> (usually)
> >>> has better dynamic range and handles QRM conditions better, 
> >>> generating less IMD products and blocking when the band gets full 
> >>> of signals.  Does the same hold true for QRN and electrical crud?  
> >>> I know that some radios have more tools than others, like noise 
> >>> reduction, notch filters, stuff like that.  Do more expensive 
> >>> receivers get less affected by RFI and other junk, and by 
> >>> atmospheric noise?
> >>>
> >>> Here is my situation:  I was having some bad powerline noise from 
> >>> a pole close to my house. The noise blanker in the radio I have 
> >>> took out the buzz, but I am seeing a S6 noise level on 40m SSB and 
> >>> on 20m SSB sometimes.
> >>> I
> >>> figured some of that came from the line noise, so I didn't think 
> >>> about doing much until the line noise was fixed first.  Well the 
> >>> power company came and fixed it today. The buzzing is gone!  The 
> >>> noise level still is there, though.  I am using a Yaesu FT100D 
> >>> which has a great noise blanker, and does have AF DSP, but it is a 
> >>> cheap, mobile type HF/VHF/UHF radio.
> >>> On
> >>> 40 meter SSB I see a S5 or S6 noise level when on SSB, and that is 
> >>> with the preamp off.  On CW it is much less because I put the 
> >>> 500hz CW filter in line.  20 meters is sometimes the same, but 
> >>> sometimes on SSB the noise is much lower, which I think is 
> >>> probably from urban crud. I live in an older neighborhood where 
> >>> the houses are maybe 8 feet apart, if that much. I am sure many 
> >>> neighbors have switching power supplies in all sorts of 
> >>> electronics.
> >>>
> >>> So, is this 40 meter noise level pretty typical for most people?  
> >>> Would a more expensive radio like a Kenwood TS590 (which is 
> >>> supposed to have a great receiver), Yaesu FTDX1200 or Icom 7200 be 
> >>> less affected by these types of noises?  I can't afford much more 
> >>> than that right now,and would like something that is fairly small 
> >>> enough to still take mobile or portable from time to time.  I did 
> >>> try a yaesu FT891 which is a mobile sized radio and it was maybe 
> >>> very slightly better, but not really noticable.  A Ten Tec Eagle 
> >>> would also be small enough.
> >>>
> >>> Is this one of the compromises you have to live with when you get 
> >>> a smaller radio?
> >>>
> >>> 73 John AF5CC
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