[time-nuts] Frequency distribution isolation transformers YCL20F001n arrived

Alan Melia alan.melia at btinternet.com
Sun Dec 14 11:59:25 EST 2014

Hi Paul I confirm the 17MHz LPF response I didn't measure them for flatness 
:-)) The source I used was surplus 16way 10BaseT switches which were junked 
some time back but may still be lying in the back of store-room 
cupboards.....you get a lot on one board that way.


----- Original Message ----- 
From: "paul swed" <paulswedb at gmail.com>
To: "Time-nuts" <time-nuts at febo.com>
Sent: Sunday, December 14, 2014 4:18 PM
Subject: [time-nuts] Frequency distribution isolation transformers 
YCL20F001n arrived

> Another Time-nut suggested the use of 10 baseT ethernet transformers for 
> 10
> MHz isolation that he pulls from old ethernet boards. The 20F001n. These
> are available from UTSource on ebay at 90 cents each NOS. Ordered 20.
> Well I have to say as a BPF or something for 10 Mhz they are lousy. BUT
> then how could they be when they are a pretty flat transformer from 40 KHz
> to 17 MHz! Take that Mini-Circuits. (Only in jest) Yes there are some 
> lumps
> and bumps in that pass band But not large maybe 1-1.3db I need to get much
> more accurate. But now I have a nice transformer that can work at WWVB 60
> Khz as well as with frequency distribution.
> They come in a dip foot print and 2 X to a package.
> I have more to check because to good to be true almost always is. At least
> for me.
> Regards
> Paul
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