[time-nuts] 10 MHz Filters

Joseph Gray jgray at zianet.com
Thu Nov 27 12:04:39 EST 2014


Just three days ago, I posted about my using transformers from
Ethernet cards. I also summarized the results of some measurements
using the spectrum analyzer. There was only one response, so it seems
that what I posted was widely ignored.

Dave M - good find on Electronic Goldmine.

Joe Gray

On Thu, Nov 27, 2014 at 8:50 AM, Dave M <dgminala at mediacombb.net> wrote:
> Electronic Goldmine has some Pulse Engineering LAN transformers (same as
> those used on many LAN boards) on clearance at $1.00 each.
> http://www.goldmine-elec-products.com/prodinfo.asp?number=G17078
> Datasheet is at http://www.datasheet4u.com/download_new.php?id=541958
> Quite cheap, in my opinion.
> Cheers,
> Dave M
> Perry Sandeen via time-nuts wrote:
>> List,
>> I have seen on the net a 10 MHz filter using 10.7 IFtransformers but
>> have no idea how well they would work for isolation with thenew style
>> Lucent boxes.
>> Thoughts?
>> On Ebay venders are offering 10 MHz crystals for almostnothing if you
>> buy 30. My question wouldthese be good for making some type of simple
>> ladder filter?
>> In his article *Modifying Lucent RFG-M-RB Rubidium FrequencyStandard*
>> the author used a 10MHz filter that was taken from an old
>> 10MbitEthernet LAN board. The part number he used was 20F001N and I
>> found them onEbay for low prices.
>> Now I don't have any access to any old ethernet LAN boardsso I'd have
>> to build from scratch.
>> Does anyone of these methods have an advantage over theothers on the
>> new style Lucent boxes or in the making of a small
>> distributionamplifier with good isolation?
>> Regards,
>> Perrier
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