[Elecraft] Planning the next filters

[Jim Brown]

It's important to understand that the variable DSP IF is plenty good 
enough for most operation. The function of the roofing filter is to 
protect the DSP from overload by strong signals outside the passband. I 
would consider buying additional filters ONLY if you're a serious 
contester.  I am, and my favorites are 250 and 400 for CW, 2.1 for SSB, 
and I've replaced the 2.7 with 2.8 for the improved flatness it 
provides, which reduces incidental AM when transmitting RTTY. I agree 
that 1.8 is too narrow for my ears.

73, Jim K9YC

On 3/8/2018 8:22 AM, Chuck Chandler wrote:
> Right now I have the stock SSB and a 400 Hz filter in both main and sub
> rcvrs.  I would like to add some a few at a time.  My first priority is to
> add a couple to the main receiver, since it is the biggest chore to get
> to.
>
> I plan on a 250 Hz CW filter, but am going back and forth between the 2.1
> and 1.8 kHz filters.  I know that narrowing the DSP to 1.8 gives a really
> difficult to understand voice signal, while the 2.1 allows in more adjacent
> signals.  However, the roofing filters may not behave in the same manner.
> For example, the 1.8 could be set to turn on at 2.1 to take advantage of
> skirt shape.