[time-nuts] 10811

billriches bill.riches at verizon.net
Mon Nov 17 19:28:46 EST 2014


Patiently waiting for my 10 mhz unit.  What are your ideas on using it to
control a 10811 instead of the built in 10 mhz osc?  Will there be enough
control voltage for the 10811?


Bill Riches
Cape May, NJ

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of S. Jackson
via time-nuts
Sent: Monday, November 17, 2014 6:40 PM
To: jim at jtmiller.com; time-nuts at febo.com
Subject: Re: [time-nuts] LTE Lite Came!!

Hi Jim,
thanks for your question. The reason we put that note in there is  two-fold:
1) On these 20MHz units the TCXO output in fact can drive 50 Ohms inputs as
we put a strong buffer on the board, but the synthesized RF output and the
1PPS output cannot drive 50 Ohms. Those two are CMOS 1M Ohms input  only.
Using 50 Ohms impedance on the TCXO output will however heavily tax  the
internal power supply and CMOS buffer, and create heating on the board
right next to the TCXO which will affect stability somewhat. So can it be
Yes. Should it be done? That's up to the user to decide.
2) On the next batch of 10MHz DIP-14 TCXO units the external TCXO itself
drives the output directly without a buffer. That TCXO is not capable of
driving  50 Ohms inputs, only CMOS 1M Ohms inputs. So a buffer is required
on these  10MHz units if 50 Ohms test equipment is to be used.
Hope that explains it,
In a message dated 11/17/2014 15:27:21 Pacific Standard Time,
jim at jtmiller.com writes:

Hello Said

I got a nice surprise in my mail today: LTE-Lite!

There was a note with it that said (in effect) none of the outputs are  
50ohm capable. So it looks like I should build up a little board with the  
divide by two and incorporate on that a 50ohm capable buffer for clock  
transmission to the rest of my system?

BTW, you're welcome to answer via Timenuts as I'm sure others will have  
the same question.



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