[Elecraft] KPA500 - Rx Attenuation

[Rick Robinson]

Isn't this basically what the Roofing Filter option in the KX3 does.
Waiting on mine to arrive this Thursday...Rick

On Sun, Feb 10, 2013 at 6:08 PM, Eric Swartz WA6HHQ - Elecraft <
eric at elecraft.com> wrote:

> Hi Gary,
>
> This is normal as the KPA500 is designed to attenuate signals the further
> you go below the 160M band in order to protect the T/R switching diodes
> from BC band overload.
>
> 73,
>
> Eric  WA6HHQ
> elecraft.com
> _..._
>
>
> On Feb 10, 2013, at 5:28 PM, AG0N-3055 <mcduffie at ag0n.net> wrote:
>
> >
> > The spectrum below 160 meters is much more drastic.  Broadcast signals
> > suffer lots of signal loss, air-nav signals disappear except for locals,
> > and 60KHz WWVB is totally missing, along with all noise of any kind from
> > the antenna.  Switching the antenna in and out, had no effect on noise,
> > not even a pop is heard in the speaker when switching antennas or
> > disconnecting connectors when the amp is in OPER position.  In STBY, all
> > sounds normal.
> >
> > Generally speaking, the broadcast band could be summed up by saying, the
> > lower in frequency you go, the more loss you are going to see when
> > switching the amp in and out.  It varies from an S-unit or two, to
> > several S-units at the bottom of the band.  Below that, it gets much
> > worse.  Only the strongest signals get through in the 250-350KHz range,
> > and just about nothing makes it below that.
> >
> > These results are also being sent to support.  I don't know if there is
> > a pin-diode problem on mine, or if this is to be expected.  I don't like
> > it, but can obviously live with it if there's nothing to be fixed.
> >
> > Gary
> > --
> >
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