Re: [Elecraft] [K2] Filters attenuation
Dave, I am wondering if you have some problem with the crystals in the variable IF filter. The variable filter design point is near 500 Hz. It will normally have attenuation below 200 Hz width and the passband will bet more 'ragged' above 1 kHz. What I am saying is that you should have a constant filter response at 700 Hz, 400 Hz with perhaps a small bit of attenuation at 200 Hz. Below that width, attenuation will increase rapidly. If your K2 is below SN 2560, and it has not been upgraded, you have the older crystals in it and I highly recommend that they be changed with the matched set of 7 crystals available from Elecraft. That will change the attenuation. Of course, if your filters are not aligned to properly center on your sidetone pitch, that alone could be the reason for your observations - that would be more apparent as the width is narrowed (the signal falls on the slope of the passband rather than at the peak). See the filter alignment information on my website www.w3fpr.com - look at part 3 of the article dealing with K2 Dial Calibration. Use Spectrogram or Spectrum Lab or similar to give you a visual picture of the filter passband placement and the relative amplitude of the filters. One of the aspects (limitations) of the K2 is that your listening sidetone pitch cannot be changed at will without peaking the narrow IF filters at that new sidetone frequency. You may be able to change the sidetone pitch by 50 Hz each side of the filter center, but much beyond that will require that the filter centers be repositioned. 73, Don W3FPR On 11/4/2010 2:12 PM, dave wrote: I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? 73 de dave ab9ca/4 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Petr, Have you used Spectrogram (or similar) to check the position of the filter passbands? If not, you should do so and center the filters at your chosen sidetone pitch. 73, Don W3FPR On 11/4/2010 12:48 PM, ok1rp wrote: Hi, I would like to ask for help. My K2 #4800 works fine but I realized the narrower filters have attenuation. I pre-set FL1200Hz, FL2400Hz and FL3700Hz but with FL1 I recognised too much attenuation which degrading the reception of weaks sigs. Is there something which I am doing wrong please? 73 - Petr, OK1RP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
G'day, The filters on K2 #1400 (fully updated): Mode: CW AGC: OFF ATT: ON Signal source: K3 Frequency: 18120kHz Pitch Freq: 650Hz Measured using Spectrogram ref level for audio peak -90dB. The sound card in my PC isn't particularly good and this low level eliminates displayed audio harmonics. Filter: 1000Hz -90 (ref) 700Hz -90 400Hz -92 200Hz - 94 FWIW. Regards, Mike VP8NO - Original Message - From: Curt rhule...@comcast.net To: elecraft@mailman.qth.net Sent: Thursday, November 04, 2010 10:37 PM Subject: Re: [Elecraft] [K2] Filters attenuation Yes, mine attenuates but haven't bothered to measure it. Strangely, the 700 Hz seems worse than the narrower filters. Curt KB5JO I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Mike, Your results are not all that abnormal. Most do not begin to encounter attenuation until less than 400 Hz, so yours is slightly worse off than normal in that regard - but then I usually consider 2 dB to be within measurement error range. However, I was concerned about those who said they had significant attenuation at 700 Hz. Even though there is attenuation at the narrow filter settings, the filters are still quite usable for combating QRM. On the lower bands, the band-noise is typically high enough that adding more gain is not beneficial unless your antenna is inefficient, but on the higher bands, running with the preamp on will more than make up for the few dB loss of the narrow filter. In other words, while this is an interesting topic for those of us with measuring tools (signal generator and Spectrogram), it is not likely to make a huge difference in actual operating. 73, Don W3FPR On 11/5/2010 1:29 PM, Mike Harris wrote: Measured using Spectrogram ref level for audio peak -90dB. The sound card in my PC isn't particularly good and this low level eliminates displayed audio harmonics. Filter: 1000Hz -90 (ref) 700Hz -90 400Hz -92 200Hz - 94 FWIW. Regards, Mike VP8NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Hi Don, I'm not concerned in the slightest, it is to be expected and was just another measured data point in the discussion. Regards, Mike VP8NO - Original Message - From: Don Wilhelm w3...@embarqmail.com To: Mike Harris mike.har...@cwimail.fk Cc: Curt rhule...@comcast.net; elecraft@mailman.qth.net Sent: Friday, November 05, 2010 3:12 PM Subject: Re: [Elecraft] [K2] Filters attenuation Mike, Your results are not all that abnormal. Most do not begin to encounter attenuation until less than 400 Hz, so yours is slightly worse off than normal in that regard - but then I usually consider 2 dB to be within measurement error range. However, I was concerned about those who said they had significant attenuation at 700 Hz. Even though there is attenuation at the narrow filter settings, the filters are still quite usable for combating QRM. On the lower bands, the band-noise is typically high enough that adding more gain is not beneficial unless your antenna is inefficient, but on the higher bands, running with the preamp on will more than make up for the few dB loss of the narrow filter. In other words, while this is an interesting topic for those of us with measuring tools (signal generator and Spectrogram), it is not likely to make a huge difference in actual operating. 73, Don W3FPR On 11/5/2010 1:29 PM, Mike Harris wrote: Measured using Spectrogram ref level for audio peak -90dB. The sound card in my PC isn't particularly good and this low level eliminates displayed audio harmonics. Filter: 1000Hz -90 (ref) 700Hz -90 400Hz -92 200Hz - 94 FWIW. Regards, Mike VP8NO No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.864 / Virus Database: 271.1.1/3239 - Release Date: 11/05/10 04:34:00 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? 73 de dave ab9ca/4 On 11/4/10 11:48 AM, ok1rp wrote: Hi, I would like to ask for help. My K2 #4800 works fine but I realized the narrower filters have attenuation. I pre-set FL1200Hz, FL2400Hz and FL3700Hz but with FL1 I recognised too much attenuation which degrading the reception of weaks sigs. Is there something which I am doing wrong please? 73 - Petr, OK1RP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Dave, yes I am confirming it is the attenuation which I am talking about... When I am decreasing BW from 1.5k to 700Hz there is not noticeable att (which means it's aprox. less then 3dB) but by going to 400Hz or even to 200Hz I hear big att which can be like You said 8dB or so. Anybody else has similar experiences pls? 73 - Petr, OK1RP On Thu, 04 Nov 2010 13:12:46 -0500, dave ho13d...@gmail.com said: I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? 73 de dave ab9ca/4 On 11/4/10 11:48 AM, ok1rp wrote: Hi, I would like to ask for help. My K2 #4800 works fine but I realized the narrower filters have attenuation. I pre-set FL1200Hz, FL2400Hz and FL3700Hz but with FL1 I recognised too much attenuation which degrading the reception of weaks sigs. Is there something which I am doing wrong please? 73 - Petr, OK1RP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Yes, mine attenuates but haven't bothered to measure it. Strangely, the 700 Hz seems worse than the narrower filters. Curt KB5JO I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [K2] Filters attenuation
Petr, I measured mine at 500 Hz a few years ago but never wrote down the number. I do remember being surprised at how much it was. I use a wider filter most of the time and only go to the narrowest when there is substantial qrm in the passband; for just the reason you mention. 73, Lenny W2BVH K2 sn 1520 On 11/4/2010 4:27 PM, Petr Ourednik wrote: Dave, yes I am confirming it is the attenuation which I am talking about... When I am decreasing BW from 1.5k to 700Hz there is not noticeable att (which means it's aprox. less then 3dB) but by going to 400Hz or even to 200Hz I hear big att which can be like You said 8dB or so. Anybody else has similar experiences pls? 73 - Petr, OK1RP On Thu, 04 Nov 2010 13:12:46 -0500, daveho13d...@gmail.com said: I dunno about the loss you are seeing but I've measured about 8 dB of loss in my K2 at 200 Hz vs 1 kHz BW. That does strike me a quite a bit of loss. I just don't use the narrow filters often. I know of at least one other K2 that has similar loss. Anyone else? 73 de dave ab9ca/4 On 11/4/10 11:48 AM, ok1rp wrote: Hi, I would like to ask for help. My K2 #4800 works fine but I realized the narrower filters have attenuation. I pre-set FL1200Hz, FL2400Hz and FL3700Hz but with FL1 I recognised too much attenuation which degrading the reception of weaks sigs. Is there something which I am doing wrong please? 73 - Petr, OK1RP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 Filters Will Not Align Properly
Howard W. Ashcraft wrote: When I started to set the filters, however, I could not get them within range. As noted above, I can not shift the passband to cover a 600hz sidetone. The filters appear to center around 900-1000 hz. I have attempted to set the filters back to my prior CAL FIL BFO settings, but to no avail. You probably did this, but I'll ask anyway: did you do CAL PLL before trying to do the CAL FIL? -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters Will Not Align Properly
I hope you are not trying to CENTER OP1 on 600 Hz. That's not right. You want the skirt to fall to zero around 200 Hz (left) and around 3K (right). There may be nothing wrong at all. If you did center it, you'd have reception on both sides of zero-beat. Dan / WG4S / K2 #2456 snip The crystal filter passband will not adjust to center on a 600hz sidetone. As you adjust the filters towards 600 hz using Spectrogram (say OP1), the filter shape degrades and then severely attenuates the signal until NO audio signal is visible on the Spectrogram display. /snip ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters Will Not Align Properly
Howard, Dan Barker's response was likely 'on target'. It is entirely possible that you have gotten the BFOs set to the wrong sideband. The CW filters should be at a lower BFO frequency than the CWr frequencies, and likewise the LSB filters should be lower than the USB filters. I suggest that you start over from 'scratch' - download the newest KSB2 manual from the Elecraft website and look at page 20 for the chart of initial BFO frequencies. Assume that your OP1 crystals are from the 3.6 set (unless you know the set designation) and enter 4913.5 in the LSB entry and 4916.3 in the USB entry and set the BFOs to the frequency indicated in that manual. Those frequencies should provide a good starting point for your filter alignment. When using Spectrogram, use a wideband noise generator or 'dead band' noise (turn the preamp on) - attempting to use a single signal to do the alignment will likely result in confusion and failure. Take care not to move the passband down through zero frequency on the Spectrogram display when moving the passband to your chosen sidetone pitch (that will move it to the wrong sideband). 73, Don W3FPR Howard W. Ashcraft wrote: After several years of faithful service, my K2/100 (with KDSP2 and KSB2) has developed a perplexing malady. The crystal filter passband will not adjust to center on a 600hz sidetone. As you adjust the filters towards 600 hz using Spectrogram (say OP1), the filter shape degrades and then severely attenuates the signal until NO audio signal is visible on the Spectrogram display. I have repeated the key realignment procedures three times, with identical results. The long story. The K2/100 generated an Info 080 message that I started diagnosing. The problem self-corrected which lead me to believe it was probably a loose connection to the KPA100. Despite lots of opening and closing the case, the problem has not reappeared. I now have better test equipment than I had when I built the K2 (serial 4357) and it seemed like a good time to realign the transceiver. I did a complete realignment, with minimal changes except a slight kick to the 4Mhz oscillator and a reasonable amount of repeaking of the bandpass filters. So far so good. All of the key tests/parameters were within range. When I started to set the filters, however, I could not get them within range. As noted above, I can not shift the passband to cover a 600hz sidetone. The filters appear to center around 900-1000 hz. I have attempted to set the filters back to my prior CAL FIL BFO settings, but to no avail. The following are the test results from this realignment. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters Will Not Align Properly
Thanks to everyone for their suggestions. However, it turned out to be a different problem. For reasons unknown, although possibly linked to the Info 80 messages, the KDSP2 was not disengaging as it should and the first DSP filter was wildly off the mark. This interfered with setting the crystal filters. Because I don't have access to the code (and if it isn't in C or C++, I would have difficulty following it), I'm not sure if a communication error could cause the DSP filter to errantly set itself. Before this all started, the DSP filters were at their default settings. In any event, once the KDSP2 was properly bypassing, everything fell in line. I'm beginning to think that the K2 saw me reading K3 specs and threw a snitfit... ;) Thanks, and 73, Howard W1WF -Original Message- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Sun 6/17/2007 5:35 PM To: Howard W. Ashcraft Cc: elecraft@mailman.qth.net; [EMAIL PROTECTED] Subject: Re: [Elecraft] K2 Filters Will Not Align Properly Howard, Dan Barker's response was likely 'on target'. It is entirely possible that you have gotten the BFOs set to the wrong sideband. The CW filters should be at a lower BFO frequency than the CWr frequencies, and likewise the LSB filters should be lower than the USB filters. I suggest that you start over from 'scratch' - download the newest KSB2 manual from the Elecraft website and look at page 20 for the chart of initial BFO frequencies. Assume that your OP1 crystals are from the 3.6 set (unless you know the set designation) and enter 4913.5 in the LSB entry and 4916.3 in the USB entry and set the BFOs to the frequency indicated in that manual. Those frequencies should provide a good starting point for your filter alignment. When using Spectrogram, use a wideband noise generator or 'dead band' noise (turn the preamp on) - attempting to use a single signal to do the alignment will likely result in confusion and failure. Take care not to move the passband down through zero frequency on the Spectrogram display when moving the passband to your chosen sidetone pitch (that will move it to the wrong sideband). 73, Don W3FPR Howard W. Ashcraft wrote: After several years of faithful service, my K2/100 (with KDSP2 and KSB2) has developed a perplexing malady. The crystal filter passband will not adjust to center on a 600hz sidetone. As you adjust the filters towards 600 hz using Spectrogram (say OP1), the filter shape degrades and then severely attenuates the signal until NO audio signal is visible on the Spectrogram display. I have repeated the key realignment procedures three times, with identical results. The long story. The K2/100 generated an Info 080 message that I started diagnosing. The problem self-corrected which lead me to believe it was probably a loose connection to the KPA100. Despite lots of opening and closing the case, the problem has not reappeared. I now have better test equipment than I had when I built the K2 (serial 4357) and it seemed like a good time to realign the transceiver. I did a complete realignment, with minimal changes except a slight kick to the 4Mhz oscillator and a reasonable amount of repeaking of the bandpass filters. So far so good. All of the key tests/parameters were within range. When I started to set the filters, however, I could not get them within range. As noted above, I can not shift the passband to cover a 600hz sidetone. The filters appear to center around 900-1000 hz. I have attempted to set the filters back to my prior CAL FIL BFO settings, but to no avail. The following are the test results from this realignment. * This communication, including any attachments, is confidential and may be protected by privilege. If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have. To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. The foregoing applies even if this notice is embedded in a message that is forwarded or attached. * ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
RE: [Elecraft] K2 Filters Will Not Align Properly
Dan, I should have been more careful when I said centering around 600hz. 600hz is set at about the first major peak of OP1 and is very close to the spacing you describe. Thanks and 73, Howard W1WF K2/100 KX1 * This communication, including any attachments, is confidential and may be protected by privilege. If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have. To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. The foregoing applies even if this notice is embedded in a message that is forwarded or attached. * ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 filters alignment
Bruce, when you tune the guy in FL1, are you tuning him in at the same pitch as the spot tone? de w1rt/john On 2/12/06, rattray [EMAIL PROTECTED] wrote: I've been enjoying operating my K2 for quite a while now - but one thing has bothered me and that is my alignment of the CW and SSB filters - my main problem is that I only have a basic understanding of what I'm doing - I feel I need a better understanding which will result in a better alignment of the filters for both modes - - here's what's bothering me - I can tune in a cw signal on the widest filter position XFIL#1 and when I switch to positions 2, 3, 4 [I've set them for 1.50, 700, 400, 100 cycles], I either lose the signal and have to retune for it or the signal is there but certainly a different tone and down in volume - it seems to me that if I have them set right, I shouldn't have to retune and the volume should be ok - - so I got out my N0SS noise generator and put a new battery in - booted up the 10 minute Spectrogram program, set it's parameters according to instructions I printed off the Elecraft Builders' Resources, set markers at 600 2000 hz and turned on the noise generator - then I went through all the steps, 1 through 15, for the CW alignment and adjusted the waveforms for each position - then returned the K2 to normal operation - - I tuned in a 40 mtr cw signal in the widest position, then switched in the next xfil position - the signal disappeared and I had to retune it in - then when I switched XFIL through the other positions I didn't have to retune - maybe I've made some progress seeing I don't have to retune xfil positions 2,3, 4 - - so I'm looking for suggestions on how to approach this procedure so I can tune in a cw signal in position 1 and then switch in xfil positions 2,3, 4 and not lose the signal - then of course I'll be looking at SSB - tnx 73 Bruce. 72/73 - Bruce ve5rc/ve5qrp - QRP-C#1, QRP-L#886, A1 Operator Enter QRP-Canada's RUN with RAC contest - details - http://www.qrp-canada.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] K2 filters alignment
Bruce, Are you certain that your first filter is set on the correct sideband? It sounds like it may not be. I suggest that you re-establish your starting point by using the manual chart of BFO frequencies and set the BFOs as indicated. After that, use the noise generator and Spectrogram to line up the filter centers better. The narrow filters can be centered on your sidetone pitch, but the 1.50 filter must not cross over the zero frequency mark (it will if you actually center the passband), I set the left edge slope of a wide CW filter to about the same as the left edge of the FL2 filter. It is easy to accomplish with Spectrogram, view the FL2 filter and place the cursor somewhere along the left edge (at about half amplitude) and click the left mouse button, that will leave a red crosshair at that point - switch to FL1 and align the left edge slope to the red crosshair mark and you will have it done. If you find the '10 minute' Spectrogram does not give you enough time, version 5 will allow you to do everything required for the K2 alignment without timing out and you can download that older version from Tom Hammond's website www.n0ss.net . As long as your desired signal is within the passband, the K2 will preserve the pitch of that signal when you switch filters - be certain you tune the signal pitch to match your sidetone and then it should be present in all the filters. You can find more information about what is happening with the filter alignment in the K2 Dial Calibration article on my website http://w3fpr.qrpradio.com . 73, Don W3FPR -Original Message- I've been enjoying operating my K2 for quite a while now - but one thing has bothered me and that is my alignment of the CW and SSB filters - my main problem is that I only have a basic understanding of what I'm doing - I feel I need a better understanding which will result in a better alignment of the filters for both modes - - here's what's bothering me - I can tune in a cw signal on the widest filter position XFIL#1 and when I switch to positions 2, 3, 4 [I've set them for 1.50, 700, 400, 100 cycles], I either lose the signal and have to retune for it or the signal is there but certainly a different tone and down in volume - it seems to me that if I have them set right, I shouldn't have to retune and the volume should be ok - - so I got out my N0SS noise generator and put a new battery in - booted up the 10 minute Spectrogram program, set it's parameters according to instructions I printed off the Elecraft Builders' Resources, set markers at 600 2000 hz and turned on the noise generator - then I went through all the steps, 1 through 15, for the CW alignment and adjusted the waveforms for each position - then returned the K2 to normal operation - - I tuned in a 40 mtr cw signal in the widest position, then switched in the next xfil position - the signal disappeared and I had to retune it in - then when I switched XFIL through the other positions I didn't have to retune - maybe I've made some progress seeing I don't have to retune xfil positions 2,3, 4 - - so I'm looking for suggestions on how to approach this procedure so I can tune in a cw signal in position 1 and then switch in xfil positions 2,3, 4 and not lose the signal - then of course I'll be looking at SSB - tnx 73 Bruce. 72/73 - Bruce ve5rc/ve5qrp - QRP-C#1, QRP-L#886, A1 Operator Enter QRP-Canada's RUN with RAC contest - details - http://www.qrp-canada.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 filters alignment
Bruce: - so I got out my N0SS noise generator and put a new battery in - booted up the 10 minute Spectrogram program, set it's parameters according to instructions I printed off the Elecraft Builders' Resources, set markers at 600 2000 hz and turned on the noise generator - then I went through all the steps, 1 through 15, for the CW alignment and adjusted the waveforms for each position - then returned the K2 to normal operation - - I tuned in a 40 mtr cw signal in the widest position, then switched in the next xfil position - the signal disappeared and I had to retune it in - then when I switched XFIL through the other positions I didn't have to retune - maybe I've made some progress seeing I don't have to retune xfil positions 2,3, 4 - Likely you have one (or more) of the BFO settings tuned to the OPPOSITE SIDEBAND (wrong side of the filter center value). Re-read my docs and HEED the part about keeping all BFO settings for CW NOR (or CE REV) on the same side (upper or lower) side of the filter center. This is a common problem for folks who haven't done it before. 73, Tom N0SS ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
For a QRPer, adding a DSP would be like a small religious experience. Adding a K100 would be like converting to Satanism. DSP replaces AF. Eric KE6US -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of wx9j Sent: Wednesday, April 20, 2005 9:41 AM To: elecraft@mailman.qth.net Subject: [Elecraft] K2 Filters I would like to know if adding a DSP unit to the K2 will make the KAF2 audio filter obsolete, or if they are used together ? Also I am curious what others think about the following, starting out with a K2, which do you think you would add next , the DSP unit or the 100 W option ? Just got my hands on a new K2 so building should start some time in the next few weeks. Thanks, Jim ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
On Wed, Apr 20, 2005 at 07:30:12PM +0200, Sverre Holm wrote: Also I am curious what others think about the following, starting out with a K2, which do you think you would add next , the DSP unit or the 100 W option ? If I read you right, your interest is in CW and not SSB, since you don't mention the KSB2 option. This is similar to my interests. I got my K2 up and running 2 months after I was licensed in 2001. It has taken me 3.5 years to upgrade to the KPA100 which I finished this winter, and the KAT100 which I finished this month. I had lots of fun with the basic QRP version, but then of course sun spots were more favorable some years ago. My impression from this list is that the KDSP2 is more useful for SSB than CW, altough opinions vary. I am still happy with the KAF2 and I don't have any plans to upgrade to a KDSP2 yet. I haven't used a KAF2, but the noise reduction function of the KDSP2 on CW is fantastic. 73, Bob N7XY ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
On Oct 13, 2004, at 9:57 PM, Joe - aa4nn wrote: I wish there was a K2 button you could push to see what filter is active. Not me. I just wish the K2 displayed the selected filter all the time... Of course, that would require more display room. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
There is! Put your finger between XFIL and AGC and press the phantom button. The filter setting displays without changing anything. I use it all the time. The book will say to press both buttons at the same time. That's hard to do. Just press between them instead. I know it's a nit, but a mind is a terrible thing. Dan / WG4S / K2 #2456 snip I wish there was a K2 button you could push to see what filter is active. /snip Sent via the WebMail system at visioncomm.net ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
If you use HamRadioDeluxe for computer control you'll see it on your screen. Gregg R. Lengling, W9DHI, Un-Retired K2/100 SN 3075 http://www.milwaukeehdtv.org - Original Message - From: Bill Coleman [EMAIL PROTECTED] To: Elecraft elecraft@mailman.qth.net Sent: Monday, December 20, 2004 7:19 AM Subject: Re: [Elecraft] K2 Filters On Oct 13, 2004, at 9:57 PM, Joe - aa4nn wrote: I wish there was a K2 button you could push to see what filter is active. Not me. I just wish the K2 displayed the selected filter all the time... Of course, that would require more display room. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
There IS a button... err... well a 'buttons'... briefly press both [AGC] and [XFIL] at the same time to see the currently active Xtal Filter. Availability is dependent upon firmware rev, but was implemented quite a while back, so most K2's should offer it. 73, Tom At 07:19 AM 12/20/04, Bill Coleman wrote: On Oct 13, 2004, at 9:57 PM, Joe - aa4nn wrote: I wish there was a K2 button you could push to see what filter is active. Not me. I just wish the K2 displayed the selected filter all the time... Of course, that would require more display room. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] K2 - Filters adjustement
Bob said: I used it after modification to inprove the filter rejection (positive) and it helped a lot. But I was not very glad with the results ! CW 1.0 - 0.7 - 0.4 - 0.2 LSB 2.4 - 2.0 - 1.8 - 1.6 USB 2.4 - 2.0 - 1.8 - 1.6 RTTY 1.8 - 1.5 - 1.0 - 0.6 Hi Bob, I use MixW too. I was using it with my TS850 with its nice 8.8 mHz 270 Hz filter for PSK31. With the MixW waterfall I could see that the Kenwood filter was pretty much about 300 Hz wide. It was a pretty nice setup for PSK31. I have an old K2 (s/n 402) that has not yet been upgraded with all the filter mods. I put the K2 in line with MixW and put in the 100 Hz wide CW filter. Note that I have not aligned this rig in 5 years. The 100 Hz K2 filter outperformed the 270 Hz filter in the TS850. I would say that the K2 filter at the nominal 100 Hz setting was about 175 Hz wide as judged by looking at the MixW waterfall and spectrum views. I'm sure using Spectromgram would give a better esult. I sold the TS850 to help pay for some K2 upgrades. So the K2 filtering stands up to and surpasses one of the better analog radios ever made. True - the filtering will not be IF Digital brick wall, but with the addition of the AF DSP unit, and the good BDR and IMD numbers that the K2 has, it should be tough to beat. Regards, Steve --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.802 / Virus Database: 545 - Release Date: 11/26/2004 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
- Original Message - From: [EMAIL PROTECTED] (Mike S) Date: Wednesday, October 13, 2004 10:28 pm Subject: Re: [Elecraft] K2 Filters At 09:57 PM 10/13/2004, Joe - aa4nn wrote... I wish there was a K2 button you could push to see what filter is active. Push AGC and XFIL together. Exactly! The trick, however is the 'together' part. I'm with Joe on this one - we could use a single button to show the filter selected. Tom WB2QDG k2 1103 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] K2 Filters
Don't think of it as pushing two buttons together. Put your finger between the buttons, and push it as one. It's easy (for us southpaws, anyhow). Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Thursday, October 14, 2004 3:31 PM To: [EMAIL PROTECTED] Cc: elecraft Subject: Re: [Elecraft] K2 Filters - Original Message - From: [EMAIL PROTECTED] (Mike S) Date: Wednesday, October 13, 2004 10:28 pm Subject: Re: [Elecraft] K2 Filters At 09:57 PM 10/13/2004, Joe - aa4nn wrote... I wish there was a K2 button you could push to see what filter is active. Push AGC and XFIL together. Exactly! The trick, however is the 'together' part. I'm with Joe on this one - we could use a single button to show the filter selected. Tom WB2QDG k2 1103 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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
