[time-nuts] 10811

[Bob Camp]

Hi

The 10811 is a leaded part pc board construction. If you don’t mind tearing it down to pieces, you can make the EFC do just about anything you wish.

Bob

> On Nov 17, 2014, at 8:32 PM, S. Jackson via time-nuts <time-nuts at febo.com> wrote:
> 
> On the PSTI message fields question, I am checking into it, will get back  
> soon with an answer.
> 
> On the 10811, that OCXO can typically be mechanically tuned to have a  1.5V 
> nominal EFC set voltage. The LTE-Lite can drive from 0V to 3.0V EFC, so  
> that should be more than required on a good (well aged and good thermal  
> stability) 10811. We have not tried driving a 10811 with it yet though, so can't  
> say for sure. One requirement is that the OCXO has a positive EFC  slope.
> 
> Bye,
> Said
> 
> 
> In a message dated 11/17/2014 16:28:51 Pacific Standard Time,  
> bill.riches at verizon.net writes:
> 
> Said,
> 
> 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?
> 
> Regards,
> 
> 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
> done? 
> 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,
> bye,
> Said
> 
> 
> 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.
> 
> 
> Thanks!
> 
> 
> Jim  AB3CV
> 
> 
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