[Elecraft] [K3] Elecraft roofing filters

[WILLIS COOKE]

I would say that you don't really need all those filters.  The DSP filter does all the heavy lifting except for removing the artifacts from signals that are inside the pass band of the roofing filter.  I have the 2.7k, 500 Hz and 250 Hz in my main receiver and just the 2.7K and 500 Hz in my second receiver.  I don't feel the need for more, but I have zero interest in FM, AM and ESSB.

Willis 'Cookie' Cooke 
K5EWJ


--- On Fri, 2/6/09, Kjeld Holm <kh at kh-translation.dk> wrote:

> From: Kjeld Holm <kh at kh-translation.dk>
> Subject: Re: [Elecraft] [K3] Elecraft roofing filters
> To: elecraft at mailman.qth.net
> Date: Friday, February 6, 2009, 12:31 AM
> Dear all,
> 
> Once and again: Thanks to all for very interesting and
> informative answers.
> 
> Right now my conclusion according to my planed way of
> operation is the
> following setup
> 
> 2 pcs KFL3A-2.8_2.7sw replacement K3 and KRX3
> 2 pcs KFL3A-1.8K SSB
> 2 pcs KFL3A-200 5-pole CW + matching
> 2 pcs KFL3A-400 CW
> 2 pcs KFL3B-FM FM
> 
> For the purpose of working as many DXCC countries as
> possible including
> picking new ones during contests on crowded  bands.
> 
> As I understand this configuration will not allow me to
> receive or transmit
> on AM but it will maybe allow ESSB later if the firmware
> can be modified to
> use the FM filter for ESSB. 
> 
> Any further comments before my ordering will be
> appreciated.
> 
> Vy 73
> OZ1CCM Kjeld
> 
>   
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> Kjeld Holm
> Sent: 5. februar 2009 17:27
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3] Elecraft roofing filters
> 
> Dear all,
> 
> Thanks for all the kind answers.
> 
> Sorry for all that fuss. Somehow I mixed up everything so I
> ended up
> thinking of some nonsense like 1.0 kHz for SSB. :-o
> 
> I will go for 250 Hz and 400 Hz for CW plus 2.8 kHz for
> SSB. And also
> filters for AM and FM.
> 
> Vy 73
> OZ1CCM Kjeld
> 
> 
> 
> -----Original Message-----
> From: W0MU Mike Fatchett [mailto:w0mu at w0mu.com]
> Sent: 5. februar 2009 15:28
> To: 'Kjeld Holm'
> Subject: RE: [Elecraft] [K3] Elecraft roofing filters
> 
> They are available on the website.   
> 
> KFL3A-1.0K  1 kHz, 8-pole roofing filter   	125.95
> 
> I have one in my K3 but I don't use it too much.  You
> might want to use it
> over a 250 or 500 filter to listen to a pile up so you can
> hear if the
> station is working people above or below his frequency.  I
> have listened to
> SSB a bit on the filter and while very narrow for SSB you
> can hear the
> station.
> 
> The better question might be, what modes do you like to
> operate?  I am about
> to order a second K3 and I was going to go with the
> following filters.  2.8
> replacing the stock 2.7/ AM/ FM/ 400 or 500 and 250.  If
> you never play to
> transmit on AM or want to do ESSB or FM those slots would
> be available.  The
> K3 I have now has the 2.7 which is being replaced with the
> 2.8/1.8/1.0/400/200 in the main rcv, 2.8/400 in the sub.
> 
> Mike W0MU
> 
> "A slip of the foot you may soon recover, but a slip
> of the tongue you may
> never get over." Ben Franklin -----Original
> Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> Kjeld Holm
> Sent: Thursday, February 05, 2009 5:44 AM
> To: 'ElecraftList'
> Subject: [Elecraft] [K3] Elecraft roofing filters
> 
> Dear all,
>  
> In the "Roofing Filter Notes from Wayne and Eric"
> link on the Order page I
> see the two sentences: "Add narrower/wider filters as
> you prefer. I like to
> use the 1.0 kHz crystal filter when tuning a crowded band
> or listening to a
> pile up."
>  
> Can anyone point me to a place that can tell me what
> "the 1.0 kHz crystal
> filter" is, where to obtain one and when it is worth
> using?
>  
> Vy 73
> OZ1CCM Kjeld 
> 
> 
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