[Elecraft] KPA500 - Rx Attenuation

[Don Wilhelm]

Rick,

The roofing filter option for the KX3 serves an entirely different 
function.  It reduces the possibility of a strong adjacent channel 
signal overloading the KX3 at the product detector stage.

The filters in the KPA500 (and the K3) that attenuate signals below 1600 
kHz are in the front end (closer to the antenna) so that strong 
broadcast signals below 1600 kHz will not overwhelm the T/R switch PIN 
diodes and cause them to be ineffective.

73,
Don W3FPR

On 2/10/2013 6:48 PM, Rick Robinson wrote:
> 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
>> _..._
>>