[OKDXA] Radios and noise

[Coy Day]

John,

I still haven't seen what kind of antenna you are using.  Verticals are
inherently noisier than horizontal dipoles.  Noise for the most part is
vertically polarized.

Coy
-- 
Coy Day, N5OK
20685 SW 29
Union City, OK 73090
405-483-5632




John Geiger wrote:
> Hi Kim,
>
> I will try that, thanks for the suggestion.
>
> 73 John AF5CC
>
> On Mon, Jan 23, 2017 at 8:12 PM, Kim Elmore <cw_de_n5op at sbcglobal.net>
> wrote:
>
>> A new radio is unlikely to effectively deal with the noise you hear.
>> There
>> could be many sources: it could be a plethora of small switch-mode power
>> supplies (SMPS) in your own home. If you can manage it, kill power at
>> your
>> house at the main breaker and see if the noise decreases. If it does,
>> you
>> can then look for the various possible sources.
>>
>> You didn't mention the antenna you use, but I know that on 40 m, I often
>> see noise levels like what you describe on my 2 el yagi up ~50 ft when
>> the
>> band is open. You'll likely see variations between day and night. Here's
>> a
>> quick way to determine if your RF environment is quiet (little man-made
>> noise): record your daytime noise level on a low band (80 or 160 m),
>> then
>> do the same at night (ou don't need a resonant antenna for this check).
>> If
>> you hear more noise at night than in the day, you're in a quiet place.
>> Why
>> does this work?  Sferics from lightning will propagate at night but be
>> absorbed in the daytime. If you can hear them at night based on an
>> increased noise level, you're in a pretty good place.
>>
>> 73,
>>
>> Kim N5OP
>>
>>
>> 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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>>>
>> --
>>
>> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
>> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>>
>> /"In theory there is no difference between theory and practice. But, in
>> practice, there is." //– Attributed to many people; it’s so true
>> that it
>> doesn’t matter who said it./
>>
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