[Elecraft] [KX3] KXFL3 dual-Passband Roofing Filter

[Bob]

Ok, but there's still another way of looking at it: the KXFL3 
filter only improves the narrow-spaced dynamic range by 8dB.
Look at the Sherwood Eng. table:

http://www.sherweng.com/table.html

*without* the KXFL3 the KX3 DRNS was measured at 96dB. That's the same as 
the K3 with the 400 Hz filter! If the KX3 must have the KXFL3 filter for 
field day or DX pileups, then the K3 isn't good enough either - yet is 
used a lot more than "sometimes" for exactly these types of operation!
What am I missing?

Bob NW8L

On Mon, 2 Jun 2014, Rick Tavan N6XI wrote:

> Date: Mon, 2 Jun 2014 18:40:09 -0700
> From: Rick Tavan N6XI <rtavan at gmail.com>
> To: Bill Frantz <frantz at pwpconsult.com>
> Cc: Elecraft Reflector <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] [KX3] KXFL3 dual-Passband Roofing Filter
> 
> The KXFL3 decision is pretty easy. If you plan to use the KX3 only with
> simple antennas (random wires, loaded verticals, magnetic loops) and for
> casual QSOs, you don't really need it. Unwanted signals will be weak enough
> not to overload the DSP. If you plan to use the KX3, even sometimes, with
> good antennas (big, high), especially in urban environments or
> multi-transmitter sites like Field Day, or on crowded bands as in contests
> or DX pileups, then you should have the filter to protect the DSP from very
> strong, adjacent signals.
>
> Another way of looking at it is, if the extra cost is not a hardship, get
> the filter. Some day you'll be glad you did.
>
> Either way, you're gonna love it!
>
> 73,
>