K3 1.0 KHz filter for CW - Needed?
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K3 1.0 KHz filter for CW - Needed?
 
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I recently added
this filter to my K3 to go with the 2.7 KHz and 500 Hz filters it already
has. These are roofing filters so there is a question of whether or not
they're needed - or even if they make a difference you can
hear.
I've spent time
tuning the bands (mostly 40) with my filter width set to 1.1 KHz and 1.0 KHz,
listening to the difference as the crystal filter is engaged. Is it
needed? I'd usually no. Does it make a difference? Most
definitely!
I greatly prefer to
operate with the 1.0 KHz filter engaged. I can keep my DSP bandwidth wider
while still rejecting noise from 2 KHz away. The overall level of grunge
in the receiver goes down when the crystal filter kicks in. I used to run
with the DSP set to about 700 Hz to get the overall sound I wanted. With
the crystal filter, I can open the DSP to 1000 Hz and get the same or more
rejection of signals several KHz away.
- Keith N1AS
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- K3 711
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Re: K3 1.0 KHz filter for CW - Needed?
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I also have the 1.0 filter in my K3 (#740) and use it almost always
when in CW (in other words, all the time!). I had a 1.0 filter in the main IF on my OmniVI and it was great on CW. I only wished that INRAD had made a matching 1.0 filter for the bandpass IF! I got the matching set for the subrx, too (2.7, 1.0, .4, .25). Allan K7GT On Mon, Jan 12, 2009 at 7:37 AM, Darwin, Keith <[hidden email]> wrote: > I recently added this filter to my K3 to go with the 2.7 KHz and 500 Hz > filters it already has. These are roofing filters so there is a question of > whether or not they're needed - or even if they make a difference you can > hear. > > I've spent time tuning the bands (mostly 40) with my filter width set to 1.1 > KHz and 1.0 KHz, listening to the difference as the crystal filter is > engaged. Is it needed? I'd usually no. Does it make a difference? Most > definitely! > > I greatly prefer to operate with the 1.0 KHz filter engaged. I can keep my > DSP bandwidth wider while still rejecting noise from 2 KHz away. The > overall level of grunge in the receiver goes down when the crystal filter > kicks in. I used to run with the DSP set to about 700 Hz to get the overall > sound I wanted. With the crystal filter, I can open the DSP to 1000 Hz and > get the same or more rejection of signals several KHz away. > > - Keith N1AS - > - K3 711 Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Darwin, Keith
On Mon, 12 Jan 2009 08:37:21 -0700, you wrote:
>I recently added this filter to my K3 to go with the 2.7 KHz and 500 Hz >filters it already has. These are roofing filters so there is a >question of whether or not they're needed - or even if they make a >difference you can hear. > >I've spent time tuning the bands (mostly 40) with my filter width set to >1.1 KHz and 1.0 KHz, listening to the difference as the crystal filter >is engaged. Is it needed? I'd usually no. Does it make a difference? >Most definitely! > >I greatly prefer to operate with the 1.0 KHz filter engaged. I can keep >my DSP bandwidth wider while still rejecting noise from 2 KHz away. The >overall level of grunge in the receiver goes down when the crystal >filter kicks in. I used to run with the DSP set to about 700 Hz to get >the overall sound I wanted. With the crystal filter, I can open the DSP >to 1000 Hz and get the same or more rejection of signals several KHz >away. > >- Keith N1AS - >- K3 711 - With the selectivity the K3 has the 1k filter opens up just enough to allow you not to miss weak stations while moving the vfo up and down the band. That's what I use it for. Tom, N5GE _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Amateur Radio Operator N5GE
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Re: K3 1.0 KHz filter for CW - Needed?
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In reply to this post by Darwin, Keith
And - remember you can set the filter to engage at a different DSP width.
Since the roofing filter has a fairly wide skirt you might want it to engage earlier. For example, I have my 500hz filter engage when the DSP is at 750hz. That way, I get the roofing advantage earlier but can still hear signals in the DSP passband. Alternatively you might want the roofer to engage later. I can see not engaging the 1khz filter until you got the DSP down below 1khz. Buck k4ia K3# 101 In a message dated 1/12/2009 5:22:38 P.M. Eastern Standard Time, [hidden email] writes: On Mon, 12 Jan 2009 08:37:21 -0700, you wrote: >I recently added this filter to my K3 to go with the 2.7 KHz and 500 Hz >filters it already has. These are roofing filters so there is a >question of whether or not they're needed - or even if they make a >difference you can hear. > >I've spent time tuning the bands (mostly 40) with my filter width set to >1.1 KHz and 1.0 KHz, listening to the difference as the crystal filter >is engaged. Is it needed? I'd usually no. Does it make a difference? >Most definitely! > >I greatly prefer to operate with the 1.0 KHz filter engaged. I can keep >my DSP bandwidth wider while still rejecting noise from 2 KHz away. The >overall level of grunge in the receiver goes down when the crystal >filter kicks in. I used to run with the DSP set to about 700 Hz to get >the overall sound I wanted. With the crystal filter, I can open the DSP >to 1000 Hz and get the same or more rejection of signals several KHz >away. > >- Keith N1AS - >- K3 711 - With the selectivity the K3 has the 1k filter opens up just enough to allow you not to miss weak stations while moving the vfo up and down the band. That's what I use it for. Tom, N5GE **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100000075x1215855013x1201028747/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=De cemailfooterNO62) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K3 1.0 KHz filter for CW - Needed?
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-----Original Message----- And - remember you can set the filter to engage at a different DSP width. Alternatively you might want the roofer to engage later. Buck - k4ia - K3# 101 -------------------------- Yes, one of the games I wanted to play is to delay the 1000 Hz filter until maybe 500 Hz. Then I can listen to how the filter really affects the signals and junk that is in the DSP stop band. Not that it really matters a whole lot, since I'm really enjoying my K3 at bandwidths of 700 to 1000 Hz with the filter engaged. - Keith N1AS - - K3 711 - _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Darwin, Keith
I ordered my K3 #2192 with 6.0, 2.8, 2.1, 1.0 and 500Hz and I do use daily the 1.0 engaged with the DSP at 800Hz and it reject pretty good stations close moving the shift down some,besides it sounds very nice to my ears,only use the 500Hz roofing when band get too crowded.
AD4C
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