[Elecraft] KPA500 - Rx Attenuation

[Ron D'Eau Claire]

If you are using a K3 with your KPA500, you can connect the antenna for
lower frequency operation to the RX ANT IN port on the K3. That's works well
for me on the AM broadcast band.

73 Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Eric Swartz WA6HHQ -
Elecraft
Sent: Sunday, February 10, 2013 3:08 PM
To: mcduffie at garymcduffie.com
Cc: elecraft
Subject: Re: [Elecraft] KPA500 - Rx Attenuation

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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