[Elecraft] K4 model v. K3S for strong nearby signal rejection.

[Drew AF2Z]

That is what the K4 FAQ says: K4HD is equivalent to a K3S.

73,
Drew
AF2Z



On 11/01/19 00:34, Bill Breeden wrote:
> 
> I asked a similar question at the Elecraft K4 Forum at the Huntsville 
> Hamfest this year and came away with the impression that the K4HD would 
> be required to meet or exceed the performance of the K3/K3s in this regard.
> 
> Since Eric, Wa6HHQ presented the forum and answered my question, he can 
> correct me if I came away with the wrong impression.
> 
> 73,
> 
> Bill - NA5DX
> 
> 
> On 10/31/2019 9:58 PM, Eric Norris wrote:
>> This doesn't answer my question.  Is the K4HD required to provide nearby
>> signal  blocking equal to or better than the K3s?  There is no statement
>> like this in the FAQ, nor any technical specs.  I'm sure Elecraft has run
>> these tests, and I hope they'll share them, or at least give us some idea
>> of the relative performance of the various K4 models compared to the 
>> K3S as
>> regards to nearby signal rejection.
>>
>> 73 Eric WD6DBM
>>
>> On Thu, Oct 31, 2019, 3:47 PM Nr4c <nr4c at widomaker.com> wrote:
>>
>>> Read the FAQ. The K4HD is a K4D with a superheat front end with roofing
>>> filters added in front of the ADCs. Like adding a K3 in front of the 
>>> SDR.
>>>
>>> Sent from my iPhone
>>> ...nr4c. bill
>>>
>>>
>>>> On Oct 31, 2019, at 6:12 PM, Tox <scott.small at gmail.com> wrote:
>>>>
>>>> K4hd (is a k4(d?) With additional filters)
>>>>
>>>>> On Thu, Oct 31, 2019, 2:52 PM eric norris via Elecraft <
>>>>> elecraft at mailman.qth.net> wrote:
>>>>>
>>>>> Can somebody tell me which of the K4 models will produce better 
>>>>> blocking
>>>>> of extremely strong (S9+20 to S9+40) nearby in frequency signals 
>>>>> than a
>>>>> K3S?  Is this blocking gain compression?  I'm trying to plan a future
>>>>> station upgrade and I have ham neighbors.
>>>>> 73. Eric WD6DBM
>>>>>
>>>>> Sent from Yahoo Mail on Android
>>>
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