[Elecraft] K3 SSB filters

[Don Wilhelm]

Hopefully that we will remember that the DSP filter skirts are steeper 
than the crystal filter skirts, so judicious use of the HiCut and LoCut 
will provide us with a better passband than narrow roofing filters.

What the roofing filters will do is keep the receiver from reducing the 
hardware AGC for stations which are within the roofing filter passband.
It takes adjacent signals in excess of S-9 +30 for the adjacent signal 
to activate the hardware AGC (which protects the front end DAC from 
overload).  If the interfering station does not exceed that threshold, 
then the DSP filters will take care of it, and the need for more narrow 
roofing filters is superfluous.

73,
Don W3FPR

On 3/31/2020 8:57 PM, Bob McGraw K4TAX wrote:
> Remember, different brands of 2.1 or 1.8 filters are not necessarily equal.  One must realize the shape factor is more important than the published BW.  Just because one radio filter is 1.8 kHz does not mean another 1.8 kHz BW is the same.
> 
> Bob, K4TAX
> 
> 
> Sent from my iPhone
> 
>> On Mar 31, 2020, at 7:02 PM, Nate Bargmann <n0nb at n0nb.us> wrote:
>>
>> I typically use Hi Cut the most, Lo Cut once in a while and almost never
>> use Width in SSB mode.  For me the 2.1 kHz filter works swell in this
>> application.
>>
>> In the late '90s I bought a TS-850s which was fitted with a 1.8 kHz
>> factory accessory filter.  I couldn't get rid of it fast enough and
>> outfitted the radio with Inrad 2.1 kHz filters.  They were far more
>> pleasing to me.
>>
>> 73, Nate, N0NB
>>
>> -- 
>>
>> "The optimist proclaims that we live in the best of all
>> possible worlds.  The pessimist fears this is true."
>>
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> 
> 
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