[OKDXA] Radios and noise
Rick
K9KK at atlinkwifi.com
Fri Jan 27 15:09:50 EST 2017
Hi Roger
The receiver bandwidth is much narrower on CW.
My SSB bandwidth is currently set to 2.4 KHZ.
My CW bandwidth is currently set to 500 cycles.
OOppss, I mean Hertz.
The different bandwidths is what your seeing.
regards
Rick
K9KK
On 1/27/2017 1:52 PM, Roger Simpson wrote:
>
>
> ------ 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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