No subject

on the filter.




On Sun, Feb 10, 2013 at 7:11 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> 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
>>> _..._
>>>
>>>
>