[Elecraft] Drift-K1

[Tom Althoff]

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" <DolfinDon at msn.com>
To: "Elecraft Discussion List" <elecraft at mailman.qth.net>; "Tom Althoff" 
<althoff at verizon.net>
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" <althoff at verizon.net>
> To: "Elecraft Discussion List" <elecraft at mailman.qth.net>
> 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" <kk5f at earthlink.net>
>> To: "Elecraft Discussion List" <elecraft at mailman.qth.net>
>> 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
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