This may be off topic but, since we’re talking RFI, EMI. It doesn’t
matter what level noise blanker reduction, it does nothing to reduce
interference that I have centered at 21.076MHz (JT65 Weak Signal band). Could
this be
arcing from brush and commutator of a motor? The start up and shut
Mark,
I had the same problem about 2 years ago on 40m. I ultimately tracked it
down by walking up and down the street with the FLEX-1500 powered by a
gel cell, my laptop, and a 3' diameter magnetic loop tuned to the area
of 40m visited by the 'hump'. The loop has an extremely sharp null
perpe
Additional data - when I disconnect the antenna input, all is quiet.
On the hex beam, the noise is more pronounced when pointing west.
When I switch to the dipole that is running E/W and broadside N/S, the noise
drops by 10 dBm.
The HiZ 4 square receiving array has more noise when
nsboro, NC FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com
From: Mark Lunday [mailto:wd4...@triad.rr.com]
Sent: Wednesday, February 20, 2013 11:17 AM
To: 'Bob McGwier'; 'Graham Haddock'
Cc: 'FlexRadio@flex-radio.biz'
Subject: RE: [Flexradio] Question about NB
Thanks, all. I will do some research to find the power supply source. The
interesting thing is that it is NOT present right now, 11:00 AM local.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com
___
FlexRad
Why is it my Flex 5000 picks up the camel hump in 160 meters but my
Hallicrafters S-76 does not. Same antenna.
It is the wifi/modem
--- On Wed, 2/20/13, Graham Haddock wrote:
Mark:
The "camel hump," as you call it, is the characteristic noise signature of
a switching power supply. You wil
Amen to all of this.
On Wed, Feb 20, 2013 at 10:56 AM, Graham Haddock wrote:
> Mark:
>
> The "camel hump," as you call it, is the characteristic noise signature of
> a switching power supply. You will be much better off eliminating that at
> its source
> than you will be getting poor Bob to writ
Mark:
The "camel hump," as you call it, is the characteristic noise signature of
a switching power supply. You will be much better off eliminating that at
its source
than you will be getting poor Bob to write a noise reduction routine to
reduce it
after it has already trashed the signal you want
Mark:
NB1 and NB2 are intended to aid mitigation of impulsive noise. NR is
intended to mitigate white noise. The hump does not fit what this (or most
any other radio) can do in its signal processing.
Bob
N4HY
On Tue, Feb 19, 2013 at 4:11 PM, Mark Lunday wrote:
> I don't normally use these.beca
I don't normally use these.because of what happens.
I have local conditions that are quiet (-130 dBm, But I do have a few RFI
sources (still to be located) which generate a 20 kHz wide "hilltop" of
noise up to -115 dBm. The noise looks like a camel hump on the panadapter,
and is usually on the
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