Message-ID: <024c01c8ed0b$c29ecf70$7900a8c0@athlon1200>
From: "Dave Brown" <tractorb@ihug.co.nz>
To: <rsgb_lf_group@blacksheep.org>
References: <002201c8eb19$ef21f930$0301a8c0@mal769a60aa920> <3652E16C8DF5458ABDD4D14CF2537C0A@AGB> <004a01c8eb5e$f72eed00$0301a8c0@mal769a60aa920> <18E35B939E2A4A418472A930207A288D@AGB> <001701c8ed07$d9f49d20$0900a8c0@AM>
Date: Thu, 24 Jul 2008 09:33:32 +1200
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Subject: LF: Re: Re: Looking for  500 Khz xtal unit , any freq ,  inside 501 504 Khz , 
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Use one of these
http://sharon.esrac.ele.tue.nl/mirrors/zl1bpu/micro/EXCITER/Index.htm
 to generate half the output frequency and double that -you may even 
get by with feeding the ~250 kHz into the stage originally intended as 
the oscillator and running it as a doubler.
Alternatively- use the exciter as is (it wont quite stretch to 500 kHz 
out - directly) and another xtal to mix it onto 500 kHz-that way you 
get to use all the exciter capabilities at 500 kHz without having to 
think about the effect of doubling everything.  And since the exciter 
can operate anywhere from DC to 300 KHz or so you have a wide choice 
of mixing xtal frequencies.
73
 Dave, ZL3FJ


----- Original Message ----- 
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, July 24, 2008 9:05 AM
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" <g8fzk@g8fzk.fsnet.co.uk>
> To: <rsgb_lf_group@blacksheep.org>
> 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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