[time-nuts] filtering a 10Mhz frequency standard?

[paul swed]

Luciano
I just placed an order for some parts with an electronics distributor in
the US called digikey.
I happened to notice they carried the orange 10.7 Mhz IF transformers
42IF222-RC so I ordered 10 of them up to build up your filter. Should have
everything late next week.
Time to warm up the soldering iron and sniff some flux.
Regards
Paul
WB8TSL

On Wed, Dec 14, 2011 at 10:02 AM, paul swed <paulswedb at gmail.com> wrote:

> Boy thats nice and simple. Shame I juts placed a order for parts could
> have added a few 10.7 xformers to the order.
>
>
> On Wed, Dec 14, 2011 at 9:55 AM, Timeok <timeok at timeok.it> wrote:
>
>> see also:
>> http://www.timeok.it/files/10_mhz_bandpass_filter.pdf
>> --
>> Luciano P. S. Paramithiotti
>> IZ5JHJ
>>
>>
>> --------- Original Message --------
>> From: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>> Subject: Re: [time-nuts] filtering a 10Mhz frequency standard?
>> Date: Dec 13, 2011 10:29 PM
>>
>> > If you are going to buffer the output, why does the filter have to be
>> > passive? Did I miss something here? Today 10MHz is in the realm of
>> > active filters. [Hey, not that I made an active filter at 10MHz.]
>> >
>> > Sensitivity is a function of the denominator. The only advantage to a
>> > LPF over a BPF is the BPF has to be centered at 10MHz, while you could
>> > bump the corner of the LPF to a higher frequency so there is less
>> > sensitivity at 10MHz This presumes you are only getting rid of harmonics
>> > and not spurs.
>> >
>> > For lowest component sensitivity, leap frog designs are best. But in
>> > continuous time designs, they require many op amps per pole.
>> >
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