Jim,
I disagree. The selected roofing filter is the first IF filter in a K3.
You might want to read what Eric and Wayne have to say on the subject at
the following link:
http://www.elecraft.com/K3/Roofing_Filters.htm
73,
Bill - NA5DX
*Jim Brown*jim at
audiosystemsgroup.com<mailto:elecraft%40mailman.qth.net?Subject=Re%3A%20%5BElecraft%5D%20200%20Hz%205-pole%20filter&In-Reply-To=%3C55B55B5D.5070800%40audiosystemsgroup.com%3E>
/Sun Jul 26 18:12:45 EDT 2015/
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------------------------------------------------------------------------
On Sun,7/26/2015 2:02 PM, Bill Breeden wrote:
/Since Sherwood's Dynamic Range Narrow Spaced measurement is of great />/interest to
CW operators, it only makes sense to make the measurement />/using a CW filter,
optional or not. The measurement would be />/meaningless to CW operators if made
using the stock sideband filter. /
Not really -- the K3, K3S, and KX3 IF filters are implemented in DSP.
The plug-in filters are additional roofing filters that protect the DSP
from overload by strong signals outside of their passband. The K3, K3S,
and KX3 have very good CW receivers without the optional roofing
filters. The roofing filters simply allow them to work very close to
very strong signals, AND cascade with the DSP filter to provide
additional rejection outside the passband.
73, Jim K9YC
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