K2 filters alignment
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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: [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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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 <[hidden email]> 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: [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 Bruce Rattray
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: [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 > > > -- > 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: [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 Bruce Rattray
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: [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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