K2 CW filter alignment
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Morning all,
I have a new (to me) K2 #2481 it has the KSB2 and KAF2 . When I check the software version it reads "2.01 H 1.02" first question is: does that mean that I am running version 2.01 or 1.02 software? I don't yet have the dead tree version of the manual(s), so I have been spot reading the ones I found onlne. I really didn't want to get into the in depth BFO alignment stuff yet and am hopefully assuming it's on the correct side. My question arose when I wanted to move the previous owners cw center frequency up from 500hz to 600hz. Using the instructions I found on: http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf Everything went well, the center frequency is now 600hz and the filters look and sound nice and tight. Referencing page 8 of the above pdf I ran in to a problem, so it says. The DAC in CW Normal does is not lower than the determined center frequency value. Then I read on page 9 and it says *if* the BFO is on the wrong side, (which the DAC readings would seem to indicate), one or more filter setting would show a shift of the center freq and be more than 200hz off. All the filter settings are dead on, no vfo changes needed when cycling thru the 4 settings. SO what's the deal here, do I ignore the DAC readings? Bandwidths used are 1400, 800, 400, 100. Center freq DAO CW Normal DAO 142 157 135 154 130 152 128 151 Ah the joys of a rig you can actually work on, heheheh. TIA -- GB & 73's KA5OAI Sam Morgan _______________________________________________ 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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Sam Morgan wrote:
> Morning all, > I have a new (to me) K2 #2481 it has the KSB2 and KAF2 . > When I check the software version it reads "2.01 H 1.02" first > question is: > does that mean that I am running version 2.01 or 1.02 software? > > I don't yet have the dead tree version of the manual(s), so I have been > spot reading the ones I found onlne. > > I really didn't want to get into the in depth BFO alignment stuff yet > and am hopefully assuming it's on the correct side. My question arose > when I wanted to move the previous owners cw center frequency up from > 500hz to 600hz. Using the instructions I found on: > http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf > > Everything went well, the center frequency is now 600hz and the filters > look and sound nice and tight. > Referencing page 8 of the above pdf I ran in to a problem, so it says. > The DAC in CW Normal does is not lower than the determined center > frequency value. > > Then I read on page 9 and it says *if* the BFO is on the wrong side, > (which the DAC readings would seem to indicate), one or more filter > setting would show a shift of the center freq and be more than 200hz *correction that was meant to say 20 hz off* > off. All the filter settings are dead on, no vfo changes needed when > cycling thru the 4 settings. > > SO what's the deal here, do I ignore the DAC readings? > Bandwidths used are 1400, 800, 400, 100. > > Center freq DAO CW Normal DAO > 142 157 > 135 154 > 130 152 > 128 151 > > Ah the joys of a rig you can actually work on, heheheh. > TIA > -- GB & 73's KA5OAI Sam Morgan _______________________________________________ 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 Sam Morgan
Sam,
Do not ignore the DAC values, they are all on the high side of the carrier which indicates that they are on the wrong sideband - as you have it now, you will transmit 1.2 kHz (double your sidetone pitch) away from your received frequency! You may enter those values into the CWr filters, because they should be on the high side of the filter center. Setup with Spectrogram again and turn the vfo knob so the DAC values go lower. You will see the passband go lower on the screen and then will reappear and then go higher in frequency again - you just shifted to the opposite sideband. When the passband is positioned more or less like it was initially, that is the correct setting. 73, Don W3FPR Sam Morgan wrote: > Morning all, > I have a new (to me) K2 #2481 it has the KSB2 and KAF2 . > When I check the software version it reads "2.01 H 1.02" first > question is: > does that mean that I am running version 2.01 or 1.02 software? > > I don't yet have the dead tree version of the manual(s), so I have been > spot reading the ones I found onlne. > > I really didn't want to get into the in depth BFO alignment stuff yet > and am hopefully assuming it's on the correct side. My question arose > when I wanted to move the previous owners cw center frequency up from > 500hz to 600hz. Using the instructions I found on: > http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf > > Everything went well, the center frequency is now 600hz and the filters > look and sound nice and tight. > Referencing page 8 of the above pdf I ran in to a problem, so it says. > The DAC in CW Normal does is not lower than the determined center > frequency value. > > Then I read on page 9 and it says *if* the BFO is on the wrong side, > (which the DAC readings would seem to indicate), one or more filter > setting would show a shift of the center freq and be more than 200hz > off. All the filter settings are dead on, no vfo changes needed when > cycling thru the 4 settings. > > SO what's the deal here, do I ignore the DAC readings? > Bandwidths used are 1400, 800, 400, 100. > > Center freq DAO CW Normal DAO > 142 157 > 135 154 > 130 152 > 128 151 > > Ah the joys of a rig you can actually work on, heheheh. > TIA > 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 Sam Morgan
> Sam Morgan wrote:
snip >> SO what's the deal here, do I ignore the DAC readings? >> Bandwidths used are 1400, 800, 400, 100. >> >> Center freq DAO CW Normal DAO >> 142 157 >> 135 154 >> 130 152 >> 128 151 >> Thanks to Don for getting me straight about having tuned to the wrong sideband. All is well in K2 #2481 land. ;-) -- GB & 73's KA5OAI Sam Morgan _______________________________________________ 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 Sam Morgan
Hi Sam:
>I really didn't want to get into the in depth BFO alignment stuff >yet and am hopefully assuming it's on the correct side. My question >arose when I wanted to move the previous owners cw center frequency >up from 500hz to 600hz. Using the instructions I found on: >http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf > >Everything went well, the center frequency is now 600hz and the >filters look and sound nice and tight. > >Referencing page 8 of the above pdf I ran in to a problem, so it >says. The DAC in CW Normal does is not lower than the determined >center frequency value. > >Then I read on page 9 and it says *if* the BFO is on the wrong side, >(which the DAC readings would seem to indicate), one or more filter >setting would show a shift of the center freq and be more than 200hz >off. All the filter settings are dead on, no vfo changes needed when >cycling thru the 4 settings. The BFO center frequencies shift downward as the bandwidth is narrowed, so you must determine where 'center' is for each bandwidth. Then, the CW Normal DAC/Freq. values should ALL be below the filter center freq determined for EACH bandwidth selected. And the CW Reverse DAC/Freq. values should all be above filter center. If you can change bandwidths and not have to re-tune the VFO to 'find' the station, chances are that everything is A-OK. However, once the filters are aligned for a selected sidetone frequency, if you change the sidetone freq. the filters will NOT automatically 'track' the change, you must re-align to the new sidetone freq. Some folks got the mistaken impression that tracking was automatic, and it's not. >SO what's the deal here, do I ignore the DAC readings? >Bandwidths used are 1400, 800, 400, 100. > >Center freq DAO CW Normal DAO >142 157 >135 154 >130 152 >128 151 These values might well be CORRECT if you are performing the alignment on 15M and above, but they should be wrong if you are performing the alignment on bands below 15M. The recommended band for performing CAL FIL is 40M. >Ah the joys of a rig you can actually work on, heheheh. Hope this helps. If not gimme a SHOUT! 73, Tom Hammond 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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In reply to this post by Sam Morgan
Sam:
>>Then I read on page 9 and it says *if* the BFO is on the wrong >>side, (which the DAC readings would seem to indicate), one or more >>filter setting would show a shift of the center freq and be more than 200hz > >*correction that was meant to say 20 hz off* > >>off. All the filter settings are dead on, no vfo changes needed >>when cycling thru the 4 settings. Generally, if one or more filters is set to the opposite sideband, tuning will actually be closer to 800Hz-2kHz, depending upon the Sidetone selected. 73, Tom _______________________________________________ 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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