[Elecraft] 700 Hz roofing filters

[Joe Subich, W4TV]

In general I agree with Wayne although I prefer to have a more
narrow bandwidth option for SSB (1.8 or 1.5 KHz).  In order to
make room for the 1.5/1.8 KHz filter, I deleted the AM filter
and use only the FM filter for the "low priority" modes wider
than 2.8 KHz.  However, it continues to frustrate me that
Elecraft have *STILL* not allowed us to use the 13 KHz filter
for AM/ESSB transmit (officially).

In any case, given the measured performance of the INRAD/Elecraft
"250 Hz" filter (about 350 to 375 Hz), I can certainly see the
utility of something like:

FL1   13 kHz (FM/AM/ESSB)
FL2   2.7 or 2.8 kHz (SSB and casual CW/DATA tuning)
FL3   1.8 or 1.5 KHz (Narrow SSB and wide data modes)
FL4   700 Hz (casual/normal CW/DATA)
FL5   350 Hz (Narrow CW/RTTY in heavy QRM)

While the "350 Hz" filter would lack the absolute selectivity of
the Elecraft 200 Hz 5-pole filter, it would be nearly optimum
for 45.45 baud RTTY and still provide a useful "narrow CW" option.

73,

    ... Joe, W4TV

On 9/21/2010 6:07 PM, Wayne Burdick wrote:
> 700 Hz is a useful CW/DATA filter bandwidth, certainly. I'm not
> surprised that some K3 owners are interested in this.
>
> Personally, I prefer much narrow CW/DATA bandwidths, and I use all
> modes. The lineup I use (and generally recommend) is:
>
> FL1   13 kHz (FM)
> FL2   6 kHz (AM/ESSB)
> FL3   2.7 or 2.8 kHz (SSB and casual CW/DATA tuning)
> FL4   400 or 500 Hz (normal CW/DATA)
> FL5   200 Hz (CW/DATA in heavy QRM)
>
> 73,
> Wayne
> N6KR
>
>
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