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Message-ID: <20060822200539.19956.qmail@web86502.mail.ird.yahoo.com>
Date: Tue, 22 Aug 2006 21:05:39 +0100 (BST)
From: LECH LASZKIEWICZ <lechlaski@btinternet.com>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <20060819231248.81fh9er3m1ogkswk@webmail3.kuleuven.be>
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Subject: Re: LF: TIP: modifiying X-tals
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I etched my crystals with hydrofluoric (not hydrochloric) acid.This acid is extremely dangerous and deadly. It can only be stored in raw rubber bottles or bottles coated inside with bees wax (not synthetic). You are not likely to be able to buy it anywhere without a permit, fortunately. A little less deadly is phosphoric acid but it is much slower in action. You can grind crystals on a flat glass panel with a little of very fine carborundum powder mixed to a paste with paraffin. Rub gently pressing with one finger describing a letter 8. You can also gring  the crystal plate edgewise. A little at a time does the trick but it is tedious work.
  Good luck  de Lech G3KAU

Rik Strobbe <Rik.Strobbe@fys.kuleuven.be> wrote: 
  I even used sandpaper to make the quarz thinner and thus increase the 
frequency. That worked sometimes up to 10%.

73, Rik ON7YD - OR7T

Quoting riese-k3djc@juno.com:

> 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" 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.


Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm


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<div>I etched my crystals with hydrofluoric (not hydrochloric)&nbsp;acid.This acid is extremely dangerous and deadly. It can only be stored in raw rubber bottles or bottles coated inside with bees wax (not synthetic). You are not likely to be able to buy it anywhere without a permit, fortunately. A little less deadly is phosphoric acid but it is much slower in action. You can grind crystals on a flat glass panel with a little of very fine carborundum powder mixed to a paste with paraffin. Rub gently pressing with one finger describing a letter 8. You can also gring&nbsp; the crystal plate edgewise. A little at a time does the trick but it is tedious work.</div>  <div>Good luck&nbsp; de Lech G3KAU<BR><BR><B><I>Rik Strobbe &lt;Rik.Strobbe@fys.kuleuven.be&gt;</I></B> wrote: </div>  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I even used sandpaper to make the quarz thinner and thus increase the <BR>frequency. That worked
 sometimes up to 10%.<BR><BR>73, Rik ON7YD - OR7T<BR><BR>Quoting riese-k3djc@juno.com:<BR><BR>&gt; In the ol days we would use a pencil or rub a bit of solder on the face<BR>&gt; real hams used ? acid to etch and raise the frequency,, I dont remember<BR>&gt; what the acid was but the local chemical company would sell a bit<BR>&gt;<BR>&gt; drill a hole in the mount face, tap it and use a screw to apply<BR>&gt; pressure and move the frequency around<BR>&gt;<BR>&gt; Bob K3DJC<BR>&gt;<BR>&gt;<BR>&gt; On Sat, 19 Aug 2006 21:16:13 +0200 "Dick" <KNAAP159@ZONNET.NL>writes:<BR>&gt; For those who didn't know, use following 'trick' to tune your own X-tal.<BR>&gt; (found it in a magazine from the VERON)<BR>&gt;<BR>&gt; Take an permant marker pen ("Edding, or similar) and put a little<BR>&gt; stripe/line on the X-tal plate.<BR>&gt; You will notice that the frequency goes down a bit.<BR><BR><BR><BR>Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm<BR><BR><BR></BLOCKQUOTE><BR>
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