[Elecraft] filters

[Merv Schweigert]

There is a newer 200HZ filter with more poles and does a great job in 
contest situations,

I have a FT-1000D with a Inrad 125hz filter in 455khz cascaded with a 
250HZ in the wide IF,
and the 1000D cannot hold a candle to a K3 skirt selectivity,   that is 
the one major reason
I bought the K3 after using one,  the difference in skirt selectivity 
was so apparent it was
not even a question,   I had several ft-1000D and none of them were even 
close,
If your ears cant hear the difference try measuring it.
Plus the 1000D filters cause IMD up the wazoo,  and by the way I also 
had the Inrad roofing
filter in the 1000D,  so actually 3 cascaded.

Merv K9FD
>
> Now, my previous rig, an FT-1000D, which is inferior to the K3 in 
> almost every other way, actually has better skirt rejection on CW, but 
> that's with cascaded crystal filters, both of either 500 or 250 Hz 
> bandwidth.  I'm not sure that's because of an inherent limitation of 
> the K3 DSP, or just the filter algorithm chosen (perhaps to limit 
> latency?).
>
> 73,
> Scott K9MA
>
>
> On 12/31/2017 21:32, john at kk9a.com wrote:
>> 400Hz is definitely my favorite CW and RTTY filter. I also use the 250Hz
>> roofing filter (switched in at 350Hz) when the QRM gets bad, what 
>> document
>> shows that this offers little improvement?
>>
>> John KK9A
>>
>>
>> K9MA wrote:
>>
>> Assuming it's for a K3(s), I don't think you will find the 250 Hz filter
>> very useful.  The response that both Elecraft and I measured shows that
>> the narrow filter really isn't much better.  Were I to do it again, I
>> would only use the 400 Hz ones.
>>
>> 73,
>> Scott  K9MA
>>
>> On 12/31/2017 17:02, doug dietz wrote:
>>> Guys
>>> i ordered a 400hz filter by mistake.  I have use for a 200h or 1k, 18.k
>>>    What ya got
>>> doug49707 at gmail.com  Doug WD8Z
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>
>