[Fwd: LF: QRN Free Site]

[Andre' Kesteloot]

vernall wrote:

> Hi all,
>
> Query on QRN versus QRM.  LF natural noise levels (QRN) are typically
> well above the front end noise in good receiving gear, and there is not
> much that can be done to improve matters further.  The QRN likely
> originates from lightning in the atmosphere.  Use of a whip/loop phased
> array producing a carioid pattern can improve S/N a little if the
> atmospheric noise is mainly from directions well away from the signal
> angle of arrival (as verified by Andrew ZL2BBJ and Nat ZL3VN, who
> regularly use phased systems for receiving amateur LF signals)
>
> On the other hand, man made noise (QRM) can be a real pain in the rear
> end when trying to receive weak LF signals.  Keeping as far as is
> practicable away from mains power seems to be the best countermeasure.
> A well decoupled power supply to an active whip sited down the backyard
> can give quite good relief from mains borne QRM at LF.
>
> Bob ZL2CA
>
> Andre' Kesteloot wrote:
> >
> > Hello LF Gang,
> > There is nothing that says that my receiver has  _got_  to be located
> > next to my transmitter, is there?
> > Over here, we are considering finding a qrn-free site, equipping it
> > properly with a good receiver, taking the whole 2 kHz band and
> > redistributing to all the members, either on a FM repeater, or on the
> > internet.
> > This won't happen probably until the fall, as we are first trying to
> > put a transmitter on the air!
> > 73
> > Andre'
> > *************************************
> > finbar o'connor wrote:
> >
> >      WHAT A DIFFERENCE WORKING FROM A QRN FREE SITE MAKES.
> >      [...]JOHN /G4GVC  HAS MADE A VERY GOOD POINT ABOUT  STATIONS
> >      PUTTING OUT GOOD  SIGNALS BUT BEING UNABLE TO HEAR VERY
> >      WELL.