[time-nuts] 5>10 doubler and old Toko RF catalogue (Cirkit 2nd ed.1994)

Alan Melia alan.melia at btinternet.com
Tue Jan 27 14:15:32 EST 2015

Hi Andrea I have here a Cirkit  2nd edition Toko catalogue dated 1993 (a 
firm local to me I dealt with quite a lot) The cat is in good condition but 
it is 128 pages and a glued spine so scanning risks breaking it up. However 
the 10k range occupies just one page and if the part adjacent to the spine 
does not copy well all you will lose is the 100off price column (and I dont 
think you can buy them for that now 20 years on :-))  )  Give me a little 
time and I will do you a scan of the page, and mail it direct as a PDF.

I might actually have some new Toko coils in the component drawers but they 
may not be 10K. However I also have a lot of 5MHz OCXOs including Racal an 
Toyocom so I might have something useful if you dont find a source nearer to 

Best Wishes

----- Original Message ----- 
From: "Andrea Baldoni" <erm1eaae7 at ermione.com>
To: <time-nuts at febo.com>
Sent: Tuesday, January 27, 2015 3:53 PM
Subject: [time-nuts] 5>10 doubler and old Toko RF catalogue (Cirkit 2nd 

> Hello All.
> Now I have some 5MHz DOCXO. I have started to experiment with them
> and I would like to build a frequency doubler.
> I already saw the very nice circuit from Gerhard Hoffmann for the Lucent, 
> I saw
> some diode circuits from Wenzel (my oscillators output around 1.5Vpp
> loaded, too scarce for diodes alone; I used a 1:2 transformer just to try
> and I obtained the 10MHz but not good for anything) and I saw the doubler
> circuit Racal Dana used in some counters I attached.
> I would like to build something like one of those; it's a full wave 
> rectifier
> made by a differential amplifier and two diodes, followed by a 10MHz 
> amp/filter
> chain much like the IF of FM radios (with AGC too!). I don't know if it's
> adequate for serious use; I also saw the Z3811-80007 doubler board used in
> Z3815A and Z3805A according to the seller, much more modern and surely 
> better,
> but I have not its schematic. Someone knows it?
> I have bought one of the Racal units, just to have the opportunity to 
> fiddle
> with an already working one; I identified the IF transformers used there 
> and
> are Toko common 10.7MHz Q=80 unit. They are not built anymore but it's 
> possible
> to find similar ones in Internet; however it happens to me frequently
> to need information about the old Toko 10K series and there is not any
> comprehensive source. I saw I share this frustration with many people in 
> the
> electronics newsgroups.
> Finally I found that a (fairly) complete Toko catalog existed, it was sold 
> by
> Cirkit in '94 and it's not available anymore.
> Someone has it in PDF form, or want to borrow it to me to scan it?
> By the way, I see that really many of the 10MHz reference out there, are 
> in
> effect doubled 5MHz ones so build a doubler seems reasonable for me.
> Best regards,
> Andrea Baldoni
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