[Elecraft] [K3] KFL3A-1.0K 1 kHz, 8-pole roofing filter : Purpose?

[Douglas Maxwell]

It's useful as a roofing filter. The DSP is then used for selectivity. If
the band isn't too busy, all is well. There is less loss through the 1KHz
filter than some of the tighter roofing filters, so less amplification is
needed to counter balance the loss and therefore less noise. Might be handy
for searching a band that's just opening or looking for a the tell tale
'599', 'up', 'up' etc of a DXpedition.

Doug GM0ELP

----- Original Message ----- 
From: "Carl Clawson" <carlclawson at verizon.net>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, February 27, 2008 10:23 PM
Subject: RE: [Elecraft] [K3] KFL3A-1.0K 1 kHz, 8-pole roofing filter :
Purpose?


>
>
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of S Sacco
> > Sent: Wednesday, February 27, 2008 1:38 PM
> > To: elecraft at mailman.qth.net
> > Subject: [Elecraft] [K3] KFL3A-1.0K 1 kHz, 8-pole roofing
> > filter : Purpose?
> >
> > Ever since I started looking at the K3, I've been wondering
> > about the purpose of the 1 kHz roofing filter.
> >
> > It's too narrow for SSB, and, for me at least, WAY too wide for CW.
> >
> > What would it be used for?  RTTY?
>
> Well, if I'm searching and pouncing for multipliers in a contest I like to
> tune down the band and hear what I'm coming up on before I get to it. 1
kHz
> is about right for that. That way I can tune more quickly than if I have
to
> sit on a frequency long enough to see if someone's there -- someone I want
> to work may be listening to someone I can't hear and I could skate right
by
> them if I went too fast. A wider filter makes this possible. Of course you
> can use a 2.7 kHz roofing filter + DSP which is exactly what I plan to do,
> being too cheap to buy the 1 kHz filter. If I were a more serious
contester,
> I'd get the 1 kHz filter. It could mean an extra multiplier or two now and
> then.
>
> 73, Carl WS7L
>
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