Figure of 8 is quite right ,The trick was to cut a shallow shape in the face
of a large cork to hold the crystal and to to cushion it . Also to finish
with what used to be called "Jewellers Rouge". A fine 'powder' being called
a 'flour' I believe.
Bryan [ older than one might think ;-(( ] G3GVB
----- Original Message -----
From: "Gary - G4WGT" <[email protected]>
To: <[email protected]>
Sent: 20 August 2006 10:52
Subject: RE: LF: TIP: modifiying X-tals
> Hi All,
>
> When I built my first xtal controlled Tx (2 Metres) I changed the
> frequencies of xtals for the oscillator using very fine carborundum paste
&
> rubbed the quartz slice in a figure of 8 movement on a flat surface, this
> was successful exept when putting too much pressure & breaking the tiny
> slice. The quartz slice probably can't be removed from the encapsulations
> today to use this method.
>
> 73
>
> Gary - G4WGT.
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of
[email protected]
> Sent: 19 August 2006 21:39
> To: [email protected]
> Subject: Re: LF: TIP: modifiying X-tals
>
>
> In the ol days we would use a pencil or rub a bit of solder on the face
> real hams used ? acid to etch and raise the frequency,, I dont remember
> what the acid was but the local chemical company would sell a bit
>
> drill a hole in the mount face, tap it and use a screw to apply
> pressure and move the frequency around
>
> Bob K3DJC
>
>
> On Sat, 19 Aug 2006 21:16:13 +0200 "Dick" <[email protected]> writes:
> For those who didn't know, use following 'trick' to tune your own X-tal.
> (found it in a magazine from the VERON)
>
> Take an permant marker pen ("Edding, or similar) and put a little
> stripe/line on the X-tal plate.
> You will notice that the frequency goes down a bit.
>
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