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.
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