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
you.
Best Wishes
Alan
G3NYK
----- Original Message -----
From: "Andrea Baldoni" <[email protected]>
To: <[email protected]>
Sent: Tuesday, January 27, 2015 3:53 PM
Subject: [time-nuts] 5>10 doubler and old Toko RF catalogue (Cirkit 2nd
ed.1994)
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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