K3: birdie on 50.045?
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when I am on 50.045.05 with PRE on I hear a low continuous tone. With
PRE off it disappears. When I twist the shift, the tone gets lower or higher in frequency. (lower when shift to the right) When I switch the filter from FL5 (500) to FL4 (2100) the tone appears at 50.045.95. The tone obviously comes from inside the transceiver, because switching the antenna does not change it. Can anybody this phenomenon? 73! de Werner OE9FWV -- "Einige halten Fussball für einen Kampf auf Leben und Tod. Aber ich versichere Ihnen, dass es weit ernster ist." Bill Shankley Email powered by Pegasus Mail free at <http://www.pmail.com> Homepage: <http://www.qsl.net/oe9fwv/> Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 K3 #656 _______________________________________________ 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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No, in my case the reveiver is quiet on this frequency.
73 Michael
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In reply to this post by oe9fwv
> when I am on 50.045.05 with PRE on I hear a low continuous tone. > With PRE off it disappears. When I twist the shift, the tone gets > lower or higher in frequency. (lower when shift to the right) > When I switch the filter from FL5 (500) to FL4 (2100) the > tone appears at 50.045.95. I observe the same conditions although the frequency is slightly different - probably due to different filter offsets and CW pitch. After looking, I see similar "signals" at 50.030 and 50.078 that change tone with the "shift" control. In all three cases, the responses are the same with either antenna or no antenna. The response drops if the attenuator is engaged. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Dr. > Werner Furlan > Sent: Monday, May 12, 2008 5:50 AM > To: [hidden email] > Subject: [Elecraft] K3: birdie on 50.045? > > > when I am on 50.045.05 with PRE on I hear a low continuous tone. With > PRE off it disappears. When I twist the shift, the tone gets > lower or higher in > frequency. (lower when shift to the right) > When I switch the filter from FL5 (500) to FL4 (2100) the > tone appears at > 50.045.95. > The tone obviously comes from inside the transceiver, because > switching > the antenna does not change it. > > Can anybody this phenomenon? > > 73! de Werner OE9FWV > > -- > "Einige halten Fussball für einen Kampf auf Leben und Tod. Aber ich > versichere Ihnen, dass es weit ernster ist." > Bill Shankley > _______________________________________________ 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 |
SV: K3: birdie on 50.045?
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I observe the same conditions although the frequency is slightly different - probably due to different filter offsets and CW pitch. After looking, I see similar "signals" at 50.030 and 50.078 that change tone with the "shift" control. In all three cases, the responses are the same with either antenna or no antenna. The response drops if the attenuator is engaged. 73, ... Joe, W4TV ... and for me they are on 50.031, 047, 079 and 095. I did not look any higher but same patter, they exist only when using sharp filter, in my case 8-pole 400 and 250 Hz. They are weak and with antenna attached hardly noticeable. There is also one extremely weak on 1819.0 kHz. Have not checked the other bands 73 Len SM7BIC _______________________________________________ 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 DL5OCD
Nothing heard here SN 709..
73 John VE3NFK
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hi all,
I have to add: it is only in CW, with PREamp on. characteristic is that moving the shift alters the height of the tone. I found one on 50.030, 50.046, 50.078, 50.094 VE3NFK schrieb am 13 May 2008 um 5:12: > > Nothing heard here SN 709.. > 73 > John VE3NFK > > DL5OCD wrote: > > > > No, in my case the reveiver is quiet on this frequency. > > > > 73 > > Michael > > -- You know you're getting old when you stop to tie your shoes and wonder what else you can do while you're down there. Email powered by Pegasus Mail free at <http://www.pmail.com> Homepage: <http://www.qsl.net/oe9fwv/> Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 K3 #656 _______________________________________________ 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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I have found the 50.046.96 birdie on my K3 #732. In CW mode it does
disappear when I switch the preamp off. However, in USB the tone is there with the preamp on or off. In only have the stock 2.7 KHz filter. Russ, N3CO ----- Original Message ----- From: "Dr. Werner Furlan" <[hidden email]> To: <[hidden email]> Sent: Tuesday, May 13, 2008 7:09 PM Subject: Re: [Elecraft] K3: birdie on 50.045? > hi all, > > I have to add: > it is only in CW, with PREamp on. > characteristic is that moving the shift alters the height of the tone. > I found one on 50.030, 50.046, 50.078, 50.094 > > VE3NFK schrieb am 13 May 2008 um 5:12: > >> >> Nothing heard here SN 709.. >> 73 >> John VE3NFK >> >> DL5OCD wrote: >> > >> > No, in my case the reveiver is quiet on this frequency. >> > >> > 73 >> > Michael >> > > > > -- > You know you're getting old when you stop to tie your shoes and wonder > what else you can do while you're down there. > > > Email powered by Pegasus Mail free at <http://www.pmail.com> > Homepage: <http://www.qsl.net/oe9fwv/> > Fone +43 5522 75013 > Fax +43 820 555 85 2621 > Mobile +43 664 6340014 > Elecraft K2 #5203 K3 #656 > > > _______________________________________________ > 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. > Version: 7.5.524 / Virus Database: 269.23.16/1429 - Release Date: > 5/12/2008 6:14 PM > > _______________________________________________ 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 oe9fwv
I have found the 50.046.96 birdie on my K3 #732. In CW mode it does
disappear when I switch the preamp off. However, in USB the tone is there with the preamp on or off. In only have the stock 2.7 KHz filter. Russ, N3CO ----- Original Message ----- From: "Dr. Werner Furlan" <[hidden email]> To: <[hidden email]> Sent: Tuesday, May 13, 2008 7:09 PM Subject: Re: [Elecraft] K3: birdie on 50.045? > hi all, > > I have to add: > it is only in CW, with PREamp on. > characteristic is that moving the shift alters the height of the tone. > I found one on 50.030, 50.046, 50.078, 50.094 > > VE3NFK schrieb am 13 May 2008 um 5:12: > >> >> Nothing heard here SN 709.. >> 73 >> John VE3NFK >> >> DL5OCD wrote: >> > >> > No, in my case the reveiver is quiet on this frequency. >> > >> > 73 >> > Michael >> > > > > -- > You know you're getting old when you stop to tie your shoes and wonder > what else you can do while you're down there. > > > Email powered by Pegasus Mail free at <http://www.pmail.com> > Homepage: <http://www.qsl.net/oe9fwv/> > Fone +43 5522 75013 > Fax +43 820 555 85 2621 > Mobile +43 664 6340014 > Elecraft K2 #5203 K3 #656 > > > _______________________________________________ > 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. > Version: 7.5.524 / Virus Database: 269.23.16/1429 - Release Date: > 5/12/2008 6:14 PM > > _______________________________________________ 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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I'm glad to hear that there's only one little birdie of concern to the
list. This is a major victory :) The K3 uses down-conversion to a low first I.F. (so we can offer narrowband crystal filters). It's nearly impossible to eliminate all birdies using this kind of conversion scheme. Weak birdies generally arise from sum and difference products of VHF harmonics of the signal sources -- an unavoidable side-effect of a high-level switching mixer. But we made sure the birdies were minimized within ham bands by carefully choosing the I.F. (8.215 MHz), using integral low-pass filtering in the mixer switching path, and shielding the front panel module. 73, Wayne N6KR --- 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 Wayne,
wayne burdick schrieb am 14 May 2008 um 9:04: > I'm glad to hear that there's only one little birdie of concern to the > list. This is a major victory :) The K3 uses down-conversion to a low > first I.F. (so we can offer narrowband crystal filters). It's nearly > impossible to eliminate all birdies using this kind of conversion scheme. I did not look at the other bands ;-) but seriously: on 6m the band here is ususally very quiet and I was searching the beacon band for any signal so I discovered these tones. And Russ is right, I can hear them also on USB of course with a frequency offset. 73! de Werner OE9FWV -- No beer, wine, or liquor will ever touch my lips...I use a straw. Email powered by Pegasus Mail free at <http://www.pmail.com> Homepage: <http://www.qsl.net/oe9fwv/> Fone +43 5522 75013 Fax +43 820 555 85 2621 Mobile +43 664 6340014 Elecraft K2 #5203 K3 #656 _______________________________________________ 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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