[OKDXA] Radios and noise

[John Geiger]

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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