[time-nuts] 10 MHz low pass filter

[Bob Camp]

Hi

The next sine wave OCXO that I see with a buffered output will be the first one. Every one I've seen has an LC filter between the output amp and the connector. If you are lucky you might have a pad, but that's not much to count on.

Bob

On Jun 20, 2012, at 7:01 PM, lists at lazygranch.com wrote:

> If the output is buffered, there really shouldn't be a problem.
> 
> Incidentally, I can crank out high order LCR filters all day just by transforming prototypes out of Zverev. But it has been my experience at even 10MHz the parasitics of the elements will throw off the design. 
> 
> 
> -----Original Message-----
> From: Bob Camp <lists at rtty.us>
> Sender: time-nuts-bounces at febo.com
> Date: Wed, 20 Jun 2012 17:49:37 
> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
> 	<time-nuts at febo.com>
> Subject: Re: [time-nuts] 10 MHz low pass filter
> 
> Hi
> 
> That's a pretty high order filter. The output of most OCXO's already has a filter on it. Combining two filters (especially high order ones) without isolation between them is not a good idea. The resulting transfer function will not be what you expect it to be….
> 
> Bob
> 
> On Jun 20, 2012, at 4:54 PM, Joseph Gray wrote:
> 
>> I came across this filter design recently and thought I'd build a few.
>> 
>> http://www.jwmeng.com/AppNote/AppNote003.html
>> 
>> I was about to place a Mouser order when I came across someone selling
>> filters, based on the above design.
>> 
>> http://www.ebay.com/itm/10-MHz-filter-kit-for-tcxo-gps-pll-/110893777470
>> 
>> The price with a board seemed low enough that I ordered a few. I'll
>> let everyone know how they work out.
>> 
>> Joe Gray
>> W5JG
>> 
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