[600MRG] 630m noise

[lstoskopf at cox.net]

Totally agree.  Unless you are using some coherent mode it is really hard to get rid of a signal in band.  It probably is some drifting power supply somewhere and it will take some serious DF effort to find.  Worse if it is coming in over the power line.  Filtering isn't worth the effort unless you can set up a loop with a strong null to null it out.

Assuming the signal isn't blocking your RX just live with it.  If it is, build something better.

OT:  Here in central Kansas where we don't usually have a lot of such, one of my buddies, maybe 20 years or so ago, would have a strong carrier pop up on one of the lower bands.  We both are in rural, low noise sites.  He spent a bunch of time and found that one of the rural water districts had purchased a setup which, when the water tower water level was low would send a continuous CW signal to a remote pump which would pump as long as the signal was on!  Really high tech!  They weren't much concerned until he demonstrated that he could (legally?) run a KW on that frequency and run the tower over.  We never found out whether they changed systems or moved the frequency out of the Ham band.

N0UU

> On January 6, 2020 at 10:43 AM Andy - KU4XR via 600MRG <600mrg at mailman.qth.net> wrote:
> 
>     Hi Dave, All:
> 
>     I have the same issue here. " wandering ( drifting around ) " noise sources... Solar Chargers - SMPS, etc.
>     all kinds of neighborhood noise, and of course the usual Powerline buzzing.
>     My opinion on using a Notch Filter ( from trying to do so in software ); More often it hurt rather than helped.
>     A set frequency Notch worked only when the " drifter " was in it... Auto Notch would follow the drifter - BUT -
>     would end up - at some point - notching out wanted frequencies, And , had to be wide because the drifter
>     occupies several cycles of BW, as does its harmonics/sidebands... Results of others may be different...
> 
>     73:
>     Andy - KU4XR
> 
> 
> 
> 
>     On Monday, January 6, 2020, 9:49:32 AM EST, Dave Riley via 600MRG <600mrg at mailman.qth.net> wrote:
> 
> 
>     Is anyone here working on a way to increase their sig/noise ratio on 630m??
> 
>     My WSPR receiver has been relatively deaf but I may be on the road to
>     better sigs..
> 
>     With the SDR receiver on 475 khz. and set for long FFT times I see a
>     wandering, wide, noisy carrier coming down the water fall usually around
>     474.8 or so...
> 
>     And I see upper sides bands of the same 'carrier' going up through 476+...
> 
>     I broke out the old Dallas Lankford home brew phaser and am using the
>     80m windom as the noise antenna with the vertical loop as receive input...
> 
>     I see instant increase in signal and strength gathering of WSPR sigs..
> 
>     It is a work in progress so I'm looking for hints and kinks info..
> 
>     TNX from DaveR @ aa1a
>     ______________________________________________________________
>     600MRG mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/600mrg
>     Help: http://mailman.qth.net/mmfaq.htm
>     Post: mailto:600MRG at mailman.qth.net
> 
>     This list hosted by: https://www.qsl.net
>     Please help support this email list: https://www.qsl.net/donate.html
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/600mrg/attachments/20200106/9ea91337/attachment.html>