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Re: LF: Re: Looking for 500 Khz xtal unit , any freq , inside 501 504

To: <[email protected]>
Subject: Re: LF: Re: Looking for 500 Khz xtal unit , any freq , inside 501 504 Khz ,
From: "Graham" <[email protected]>
Date: Wed, 23 Jul 2008 22:53:18 +0100
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Ok Alan

Its been a long time since i used anything like this ! , used to watch G3SX etching xtal's with a bath of hydrofloric acid and a bc221 , think FT840 or something like that or 480 , small unit that the front plate came off . ive edge ground them on a finishing oil stone , never used vim , dose that remove side bands ? :)
Any 'big' rock will do , I think I have a 500 Khz unit , which would grind
'hf' but would not like to make a mess of it , better , see if I can find
one 'in band' size is not a problem ...
Tnx - G ..






--------------------------------------------------
From: "Alan Melia" <[email protected]>
Sent: Wednesday, July 23, 2008 10:05 PM
To: <[email protected]>
Subject: LF: Re: Looking for 500 Khz xtal unit , any freq , inside 501 504 Khz ,
Hi Graham 500khz crystals are quite difficult to make and certainly you
wount fine one in a smaller package than HC6/U as far as I remember. There
are some 10X series rocks that were used in one of the frequency calibrators
(No 10 I think) They will need chasing up a little with some "scouring
powder". I think that is probably the best bet.....good luck finding
one...... I have one but its part of my crystal collection so not for sale
:-))

I have seen 453.xx kHz crystals in HC6/U but never come across any 500kHz.
You could always put a 500kHz ceramic resonator inside an HC6/U case !!

Cheers de Alan G3NYK


----- Original Message -----
From: "Graham" <[email protected]>
To: <[email protected]>
Sent: Wednesday, July 23, 2008 9:14 PM
Subject: LF: Looking for 500 Khz xtal unit , any freq , inside 501 504 Khz ,

Looking for  500 Khz xtal unit , any freq ,  inside 501 504 Khz ,

Pref round 502 KHz , fundamental, needs to be a 'big' one , for a valve
oscillator  !

I assume hc6u would be ok  or bigger , these look to  be the right type !

http://hipme.com/weblogs/wa5znu/20050302210827/xtals.jpg

Tnx - G ..





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