[Elecraft] Roofing Filters

[Joe Subich, W4TV]

 >          Could you elaborate on "dynamic range" in crystal filters?

All crystals have imperfections (flaws).  Those flaws create distortion
when the crystal is driven with a high level signal and the distortion
(non-linear response) results in intermodulation distortion (IMD).

The K3/K3S operates the crystal filter at a higher level than many other
receivers.  Thus, testing the filters for linearity at the maximum
signal level (equivalent to S9 +40 dB - where the hardware AGC engages)
is important to assure the best possible performance over the entire
operating range of the K3/K3S.

73,

    ... Joe, W4TV


On 6/22/2017 3:12 PM, Bob wrote:
> Hi Wayne,
> 
>          Could you elaborate on "dynamic range" in crystal filters?  A 
> quick search did not yield a definition.  A SWAG might be another term 
> for ultimate rejection or it with ripple in the passband...
> 
>          Just curious.
> 
> 73,
> Bob
> K2TK ex KN2TKR (1956) & K2TKR
> 
> 
> On 6/22/2017 12:54 PM, Wayne Burdick wrote:
>> Yes. We screen every INRAD filter. Those that don’t meet our dynamic 
>> range targets are rejected.
>>
>> Wayne
>> N6KR
>>
>>
>>> On Jun 22, 2017, at 9:46 AM, Vic Rosenthal <k2vco.vic at gmail.com> wrote:
>>>
>>> I recall Wayne saying that Elecraft tested filters received from 
>>> INRAD for some specific performance characteristics. I don't remember 
>>> the details.
>>>
>>> Vic 4X6GP
>>>
>>>> On 22 Jun 2017, at 17:14, Clay Autery <cautery at montac.com> wrote:
>>>>
>>>> INRAD makes Elecraft's filters as I understand it...
>>>>
>>>> I'll be getting mine from Elecraft directly.
>>>>
>>>> ______________________
>>>> Clay Autery, KY5G
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