[time-nuts] 10 MHz low pass filter

Bob Camp lists at rtty.us
Thu Jun 21 00:28:21 UTC 2012


Hi

The standard FE-5680 very much has an LC filter between the output amp and the output pin. I'd take out their filter and put this one in. I would not use both together.

Bob

On Jun 20, 2012, at 7:23 PM, Joseph Gray wrote:

> I thought I'd put one on a FE-5680A and see what happens to the third
> harmonic. It might also be interesting to see if I get a decent sine
> wave out of the filter with a square wave in.
> 
> Joe Gray
> W5JG
> 
> On Wed, Jun 20, 2012 at 3:49 PM, Bob Camp <lists at rtty.us> wrote:
>> 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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>> 
>> 
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> 
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