[OKDXA] Radios and noise
Roger Simpson
rksimpson1 at cox.net
Fri Jan 27 14:52:06 EST 2017
------ Original Message ------
From: "Steve Duskin" <sduskin at gmail.com>
To: "'Oklahoma DX Association'" <okdxa at mailman.qth.net>
Sent: 1/27/2017 8:59:04 AM
Subject: Re: [OKDXA] Radios and noise
>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
========================================
Comment from K5RKS:
I guess i'm lucky. As far as I know I don't have noise from household
equipment. It could be that the noise level from this equipment is so
low and constant that I don't notice it. I do have a pretty high noise
level sometimes on 40m. However the noise varies between day and night.
It is higher at night so I guess the high noise is due to overall static
when the band is open [i.e. at night] and not something local at my
house or in the neighborhood.
One thing I noticed on my ICOM 7600 is that very different S meter
readings are observed when listening to 40 meters depending upon whether
I listening on LSB or CW. For example, right now I am listening at 7100
on LSB with the antenna connected and with no signal audible and the S
meter says S7. Without doing anything except switching to CW my S meter
says S3. I have no idea what the S meter is supposedly telling me. I
never pay any attention to S meter readings because they really don't
seem to mean much. All I know that a CW signal that peaks at S/9 is
louder than a CW signal peaking at S/3. That is about all I can make out
of whatever the S meter is saying.
I wonder any of you have seen S meters on other gear -- Kenwood, Yaesu,
Elecraft, etc. give totally different readings when everything stays the
same [band, antenna, time of day] and you switch from SSB to CW or
vice/versa?
>
> 73 Roger K5RKS
=======================================
>
>-----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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