[Lf] RE: QRSS and QRN

[Frank Gentges]

Hi,

Andy is on the right track.  A manual AGC with gain control adjusted to
clip just a bit above the signal may be optimum in the presence of
sferics.  The US Navy Verdin VLF system had that feature.  Perhaps
better yet is a noise blanker with a wideband impulse detector adjusted
to take out those few microseconds that trash the receiver so badly.  We
at AMRAD need to think about how we can make LF "all season" so we can
work with and through all this.  I was down at Nags Head last weekend
and heard quite a bit because no storms were trashing the band so the
propagation is there.  Sferics is our new frontier.

Frank K0BRA

Andre' Kesteloot wrote:
> 
> Talbot Andrew wrote:
> 
> > The static crashes are only " 20dB over 9" for the few microseconds
> > while they are happening.   When using Spectran etc. try turning off the
> > AGC completely and just allow the static crashes to overload the
> > receiver for their duration.  The Rx will continue working normally
> > between the crashes and should allow through the signal for processing
> > at normal strength.   Leaving the AGC operating just destroys receiver
> > gain during its hang period.  I find that for almost any radio
> > monitoring activity manual gain control is better than AGC operation.
> >
> > Andy  G4JNT
> 
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-- 
Frank Gentges 
K0BRA, ex AK4R, W3FGL
Check out our LF web page at <http://amrad.org/projects/lf>