Drift-K1
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I have had my K1 #1734 in use occaisionally since I built it.
The other day I noticed quite abit of drift,even after warm up,like 1-2 khz. over an hour or so.I think I remember it was going lower in freq. I just wondered if anyother owners have had a similar problem? Could be from day one and I just now noticed it! Can't really say, Thanks John KF7OM _______________________________________________ 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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John wrote:
>I have had my K1 #1734 in use occaisionally since I built it. >The other day I noticed quite abit of drift,even after warm up, >like 1-2 khz. over an hour or so. That sounds unusually high unless the ambient temperature around the K1 was changing significantly or the DC voltage was swinging very low. I'd want to check how stable the output voltage the 6v regulator RF-U6 was. I often turn on my K1 and set it for 60.0 in the LCD display. It doesn't matter which band, because the frequency display system senses and counts the LC VFO only, and senses neither of the two crystal oscillators that combine with the LC VFO to set the frequency of operation. I usually find several hours later that the display shows about 200 Hz lower, or 59.8. After the initial warm up, I can reset the K1 display back to 60.0 and find it still indicating 60.0 twenty hours later. I think that's very good for an LC VFO, so I have no complaints about K1 stability. 73, Mike / KK5F K1 #175 _______________________________________________ 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 john gabbard-4
My K1 is very sensitive to placement. If I pick it up or turn it upside
down, I can hear it shift up or down in frequency. If I move a speaker near the rig (or a PS) it moves a lot. If I just leave it alone it stays right on frequency. Does this sound like normal behavior? - Keith KD1E - _______________________________________________ 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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It is sensitive to electromagnetic fields (speaker, rotor control, and PS)
if they are closer than about a foot or so. So is the K2. But mine isn't sensitive to orientation. Maybe orientation puts it closer to an em field on your operating desk. Eric KE6US www.ke6us.com -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Darwin, Keith Sent: Thursday, February 23, 2006 1:04 PM To: Elecraft Discussion List Subject: RE: [Elecraft] Drift-K1 My K1 is very sensitive to placement. If I pick it up or turn it upside down, I can hear it shift up or down in frequency. If I move a speaker near the rig (or a PS) it moves a lot. If I just leave it alone it stays right on frequency. Does this sound like normal behavior? - Keith KD1E - _______________________________________________ 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 john gabbard-4
>My K1 is very sensitive to placement. If I pick it up or turn it upside
>down, I can hear it shift up or down in frequency. Anything that squeezes or otherwise distorts the K1 bottom cover plate (such as when the case is grabbed during repositioning) will cause a small frequency shift (I see well below 100 Hz), due to the change of metal bottom cover plate position near the LC VFO circuitry on the RF PCB. The frequency returns to original when the pressure is released on the bottom cover. 73, Mike / KK5F _______________________________________________ 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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Mike... That reminds me. I noticed that too. Whenever I picked up the K1
and sqeezed the bottom it would shift maybe even more than 100Hz. There was a small double sided sticky tape covered hard rubber piece in my packing material. I never saw what it was for in the instructions or if it even belonged in the K1 kit or not. But I exposed one side of the sticky tape and pressed it onto the bottom cover below the VFO section. Now when I sqeeze the distance between the bottom cover and the PC board doesn't change much at all and the freq shift is reduced dramatically. I just mention that in case others find a 1/2" black square with sticky tape on it in their K1 kits and would like to put it to good use. Tom K2TA ----- Original Message ----- From: "Mike Morrow" <[hidden email]> To: "Elecraft Discussion List" <[hidden email]> Sent: Thursday, February 23, 2006 6:41 PM Subject: RE: [Elecraft] Drift-K1 > >My K1 is very sensitive to placement. If I pick it up or turn it upside > >down, I can hear it shift up or down in frequency. > > Anything that squeezes or otherwise distorts the K1 bottom cover plate (such as when the case is grabbed during repositioning) will cause a small frequency shift (I see well below 100 Hz), due to the change of metal bottom cover plate position near the LC VFO circuitry on the RF PCB. The frequency returns to original when the pressure is released on the bottom cover. > > 73, > Mike / KK5F > _______________________________________________ > 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
If I remember right that 1/2 inch rubber with the sticky tape on it is used as a spacer for the LCD display. You are supposed to stick it on the pc board under the display and then stick the display to it and then solder the pins. I have not built a K1 lately (although I have built several) so with the new backlight this may not be the way it is mounted now. Don Brown KD5NDB ----- Original Message ----- From: "Tom Althoff" <[hidden email]> To: "Elecraft Discussion List" <[hidden email]> Sent: Thursday, February 23, 2006 6:10 PM Subject: Re: [Elecraft] Drift-K1 > Mike... That reminds me. I noticed that too. Whenever I picked up the > K1 > and sqeezed the bottom it would shift maybe even more than 100Hz. > > There was a small double sided sticky tape covered hard rubber piece in my > packing material. I never saw what it was for in the instructions or if > it > even belonged in the K1 kit or not. > > But I exposed one side of the sticky tape and pressed it onto the bottom > cover below the VFO section. Now when I sqeeze the distance between the > bottom cover and the PC board doesn't change much at all and the freq > shift > is reduced dramatically. > > I just mention that in case others find a 1/2" black square with sticky > tape > on it in their K1 kits and would like to put it to good use. > > Tom K2TA > > ----- Original Message ----- > From: "Mike Morrow" <[hidden email]> > To: "Elecraft Discussion List" <[hidden email]> > Sent: Thursday, February 23, 2006 6:41 PM > Subject: RE: [Elecraft] Drift-K1 > > > > >My K1 is very sensitive to placement. If I pick it up or turn it > > >upside > > >down, I can hear it shift up or down in frequency. > > > > Anything that squeezes or otherwise distorts the K1 bottom cover plate > (such as when the case is grabbed during repositioning) will cause a small > frequency shift (I see well below 100 Hz), due to the change of metal > bottom > cover plate position near the LC VFO circuitry on the RF PCB. The > frequency > returns to original when the pressure is released on the bottom cover. > > > > 73, > > Mike / KK5F > > _______________________________________________ > > 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 Mike Morrow-3
I have been reading these messages about the drift and or change of frequency when you move the K1. So, I just turned my K1 on for a few minutes and it is just as solid as a rock. I turned it upside down and moved it around but no change in frequency. I figure I should be happy about that!!
Paul Gates, KD3JF Elecraft Kits: K1 #0231 KX1 #1186 XG1: Signal Generator ----- Original Message ---- From: Mike Morrow <[hidden email]> To: Elecraft Discussion List <[hidden email]> Sent: Thursday, February 23, 2006 6:41:46 PM Subject: RE: [Elecraft] Drift-K1 >My K1 is very sensitive to placement. If I pick it up or turn it upside >down, I can hear it shift up or down in frequency. Anything that squeezes or otherwise distorts the K1 bottom cover plate (such as when the case is grabbed during repositioning) will cause a small frequency shift (I see well below 100 Hz), due to the change of metal bottom cover plate position near the LC VFO circuitry on the RF PCB. The frequency returns to original when the pressure is released on the bottom cover. 73, Mike / KK5F _______________________________________________ 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 Don Brown-4
AHA!! Now I understand. I installed the backlight at the same time that
I built my K1 so I never came across the instructions to use it as a spacer...although it sure seems thicker than the gap between the display and the backlight but I'm going just from memory. So for those of you who build a K1 and install the backlighting option you can mount that unused rubber piece between the main printed circuit board and the bottom cover to prevent shifting of the VFO when you press on the bottom. Not that that is a real problem in normal operation. Again...I attached mine to the bottom cover and left the anti-stick paper attached to the side facing the pc board. ----- Original Message ----- From: "Don Brown" <[hidden email]> To: "Elecraft Discussion List" <[hidden email]>; "Tom Althoff" <[hidden email]> Sent: Thursday, February 23, 2006 7:40 PM Subject: Re: [Elecraft] Drift-K1 > Hi > > If I remember right that 1/2 inch rubber with the sticky tape on it is > used as a spacer for the LCD display. You are supposed to stick it on the > pc board under the display and then stick the display to it and then > solder the pins. I have not built a K1 lately (although I have built > several) so with the new backlight this may not be the way it is mounted > now. > > Don Brown > KD5NDB > > > ----- Original Message ----- > From: "Tom Althoff" <[hidden email]> > To: "Elecraft Discussion List" <[hidden email]> > Sent: Thursday, February 23, 2006 6:10 PM > Subject: Re: [Elecraft] Drift-K1 > > >> Mike... That reminds me. I noticed that too. Whenever I picked up the >> K1 >> and sqeezed the bottom it would shift maybe even more than 100Hz. >> >> There was a small double sided sticky tape covered hard rubber piece in >> my >> packing material. I never saw what it was for in the instructions or if >> it >> even belonged in the K1 kit or not. >> >> But I exposed one side of the sticky tape and pressed it onto the bottom >> cover below the VFO section. Now when I sqeeze the distance between the >> bottom cover and the PC board doesn't change much at all and the freq >> shift >> is reduced dramatically. >> >> I just mention that in case others find a 1/2" black square with sticky >> tape >> on it in their K1 kits and would like to put it to good use. >> >> Tom K2TA >> >> ----- Original Message ----- >> From: "Mike Morrow" <[hidden email]> >> To: "Elecraft Discussion List" <[hidden email]> >> Sent: Thursday, February 23, 2006 6:41 PM >> Subject: RE: [Elecraft] Drift-K1 >> >> >> > >My K1 is very sensitive to placement. If I pick it up or turn it >> > >upside >> > >down, I can hear it shift up or down in frequency. >> > >> > Anything that squeezes or otherwise distorts the K1 bottom cover plate >> (such as when the case is grabbed during repositioning) will cause a >> small >> frequency shift (I see well below 100 Hz), due to the change of metal >> bottom >> cover plate position near the LC VFO circuitry on the RF PCB. The >> frequency >> returns to original when the pressure is released on the bottom cover. >> > >> > 73, >> > Mike / KK5F >> > _______________________________________________ >> > 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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