KDSP2 question
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Is it normal that (according to Spectrogram) my new KDSP2's
filters have sharper skirts and far less ripple than the XFIL filters? I'm not talking about the denoiser or the autonotch, just the bandpass filters. Is the KDSP2 that good or are my X filters defective? Also, I'd like to hear from other KDSP2 owners as to what they have "nr" and "nt" set to. I have these values and they seem to work: nr 30 50 nt 50 00 Comments welcome.... 73 de Ken KGØWX - Flying Pigs #-1055 Elecraft K2 #4913 - Kadiddlehoppers #11,807 _______________________________________________ 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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This is normal, Ken.
A good DSP filter has exactly the characteristics you describe. When I use Spectrogram to adjust my crystal filters, I first set the DSP to the desired bandwidth, then the XFIL, then do the adjustment until I get the best looking curve. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Ken Bessler Sent: Wednesday, October 12, 2005 9:04 AM To: Elecraft Main Group Subject: [Elecraft] KDSP2 question Is it normal that (according to Spectrogram) my new KDSP2's filters have sharper skirts and far less ripple than the XFIL filters? I'm not talking about the denoiser or the autonotch, just the bandpass filters. Is the KDSP2 that good or are my X filters defective? Also, I'd like to hear from other KDSP2 owners as to what they have "nr" and "nt" set to. I have these values and they seem to work: nr 30 50 nt 50 00 Comments welcome.... 73 de Ken KGØWX - Flying Pigs #-1055 Elecraft K2 #4913 - Kadiddlehoppers #11,807 _______________________________________________ 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 _______________________________________________ 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 Ken Bessler
> Is it normal that (according to Spectrogram) my new KDSP2's
> filters have sharper skirts and far less ripple than the XFIL filters? Almost all the ripple you will see in a plot with spectrogram is the rippler from the crystal filters. The DSP filters have very little passband ripple of their own. The skirts for most of the filters fall off sharply in a couple hundred Hertz. The skirts for the CW "soft" positions are a bit gentler. 73, Lyle KK7P _______________________________________________ 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 n6wg
Best looking curve?? Can you elaborate Bob? It has been a while
since I set mine up and I have adjusted the sidetone somewhat to peak the sidetone to my hearing. I need to go in and make sure the sidetone is still in the center of the passband on the filters. I have never used Spectrogram to adjust my DSP filters. Stan Rife W5EWA Houston, TX K2 S/N 4216 -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Robert Tellefsen Sent: Wednesday, October 12, 2005 11:32 AM To: Ken Bessler; Elecraft Main Group Subject: RE: [Elecraft] KDSP2 question This is normal, Ken. A good DSP filter has exactly the characteristics you describe. When I use Spectrogram to adjust my crystal filters, I first set the DSP to the desired bandwidth, then the XFIL, then do the adjustment until I get the best looking curve. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Ken Bessler Sent: Wednesday, October 12, 2005 9:04 AM To: Elecraft Main Group Subject: [Elecraft] KDSP2 question Is it normal that (according to Spectrogram) my new KDSP2's filters have sharper skirts and far less ripple than the XFIL filters? I'm not talking about the denoiser or the autonotch, just the bandpass filters. Is the KDSP2 that good or are my X filters defective? Also, I'd like to hear from other KDSP2 owners as to what they have "nr" and "nt" set to. I have these values and they seem to work: nr 30 50 nt 50 00 Comments welcome.... 73 de Ken KGØWX - Flying Pigs #-1055 Elecraft K2 #4913 - Kadiddlehoppers #11,807 _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ 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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Hi Stan
You do it just the way you would without the DSP unit. First select the pitch you want to have at the center of the filter. I use about 550 Hz here. Then adjust the KDSP2 for the narrowest setting you want to use, say 100 Hz, centered on the pitch you have selected. Now do the adjustments to the crystal filter at its narrowest bandwidth until you see the most even symmetrical passband curve. Now step the DSP unit to the next wider bandwidth you want, and do the same for the crystal filter. Again adjust the crystal filter for the best looking curve at that bandwidth. Keep doing this up to the widest bandwidth of the crystal and DSP filters. For convenience I use the same bandwidth in both filters at a given selection setting--XF1=AF1, XF2=AF2, etc. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: Stan Rife [mailto:[hidden email]] Sent: Wednesday, October 12, 2005 9:56 AM To: 'Robert Tellefsen'; 'Ken Bessler'; 'Elecraft Main Group' Subject: RE: [Elecraft] KDSP2 question Best looking curve?? Can you elaborate Bob? It has been a while since I set mine up and I have adjusted the sidetone somewhat to peak the sidetone to my hearing. I need to go in and make sure the sidetone is still in the center of the passband on the filters. I have never used Spectrogram to adjust my DSP filters. Stan Rife W5EWA Houston, TX K2 S/N 4216 -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Robert Tellefsen Sent: Wednesday, October 12, 2005 11:32 AM To: Ken Bessler; Elecraft Main Group Subject: RE: [Elecraft] KDSP2 question This is normal, Ken. A good DSP filter has exactly the characteristics you describe. When I use Spectrogram to adjust my crystal filters, I first set the DSP to the desired bandwidth, then the XFIL, then do the adjustment until I get the best looking curve. Good luck and 73 Bob N6WG The Little Station with Attitude -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Ken Bessler Sent: Wednesday, October 12, 2005 9:04 AM To: Elecraft Main Group Subject: [Elecraft] KDSP2 question Is it normal that (according to Spectrogram) my new KDSP2's filters have sharper skirts and far less ripple than the XFIL filters? I'm not talking about the denoiser or the autonotch, just the bandpass filters. Is the KDSP2 that good or are my X filters defective? Also, I'd like to hear from other KDSP2 owners as to what they have "nr" and "nt" set to. I have these values and they seem to work: nr 30 50 nt 50 00 Comments welcome.... 73 de Ken KGØWX - Flying Pigs #-1055 Elecraft K2 #4913 - Kadiddlehoppers #11,807 _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ 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 Ken Bessler
Hi Ken,
Assuming you have the crystal filter adjustment where you want it in Spectragram, they tend to not to be as brick wall as the DSP, but still are very good for a single adjustable crystal filter. However, the crystal filters are in the IF and they are needed to cut out adjacent interference that would pulse the AGC like crazy and make the signal you want to hear unreadable if you were only using the audio DSP filters. (At least I think that’s how the agc works). So for operating you need to start wide open, and then you need to start narrowing the bandwidth first using the Xfil settings. Once you narrow it down so the adjacent interference is not causing the desired signal to degrade, then you can add a bit of the DSP filtering to sharpen up the skirts. I have the narrower dsp settings with a lot of audio boost so they really pop out of the background. That’s how I do it. Both the crystal (IF) and DSP (AF) have a purpose and individual advantage, but should really be used together. Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.14/128 - Release Date: 10/10/2005 _______________________________________________ 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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