[time-nuts] Simple 5 to10MHz frequency doubler

[paul swed]

Luciano,
Great they are 10.7 MC IF xformers then.
Thanks

On Mon, Dec 27, 2010 at 11:09 AM, Paramithiotti, Luciano Paolo S <
luciano.paramithiotti at hp.com> wrote:

>
> Hi Stan,Alan,
>
> ++++++++++++++++++
> Could you suggest a part number/source for the T2, T3, T4  10.7 MHz IF
> transformers ?
> +++++++++++++++++
> R: I have a little stock at home for my use.
> There is a seller http://www.rfmicrowave.it/catalogue.php?lang=ita have
> the green type I think is usable. The part nr is: "B-10.7-B-10-Verde" but I
> suggest you to ask to a local RF parts distributors. These transformers are
> used in FM radio.
> ++++++++++++++++++++++++
> I am concerned that a narrow 10MHz filter might give significant phase
> shifts (the YCL is a LP) is this likely to be a problem??
> ++++++++++++++++++++++++
> R: If you think the filter is a problem for the phase stability you can
> remove it, but the harmonics and fundamental will be high. I remember the
> frequency distributor HP5087A use tuned amplifiers inside. The Racal 1992 TI
> counter use a 5MHz oscillator and an active doubler inside with LC band pass
> filter and ALC.
> ++++++++++++++++++++++++
> Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16 DIL
> filter/isolating transformers ( identified as a 10F434 from YCL) ....and the
> spec an pin-out was still available on the YCL web site.....worth a look for
> 10MHz distribution??
> ++++++++++++++++++++++++
> R: I have not experience with this kind of transformers,I think the
> separation between the channels is very important (trigger level stability
> when we will measure it)), so I am preparing an active frequency doubler
> with high separation  between the 3 outpus. The circuit use separate
> elements and will take particular attention to the ground loops. I will
> email it to the Web when will be terminated.I use the core described as T1
> in the doubler.
>
> Thanks,
> Luciano
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