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, j...@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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