[time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit

[Brooke Clarke]

Hi Ulrich:

I think the answer is what other low cost options are available?  I 
would like to have a more modern TIC capability to add to the clock I'm 
working on.  But although there's been a lot of discussion about 
different ways of making TIC measurements, it's not clear to me how to 
do it on a budget.

For example the TIC232 circuit by Richard H McCorkle is easy to 
implement, but how good is it's noise floor.  See:
http://www.piclist.com/techref/member/RHM-SSS-SC4/TIC232.htm

Then there's the low cost frequency counting TIC that appeared in QEX 
that we know trades performance for low cost so it's not a candidate.

Any ideas on what circuits have a noise floor that's compatible with the 
M12+T or it's newer equivalents and at the same time are in the low cost 
category? 

Have Fun,

Brooke Clarke

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com

Ulrich Bangert wrote:

> <>Tom,
> .....
>
> What I wanted to explain is the Shera concept noise floor is a factor 20
> above what a modern receiver can deliver (again inc. the sawtoth
> correction). And yes, you are right: There were different numbers when
> this concept was thought out! And exactly because different number were
> there when this concept was thougt out I am going to ask why people
> still built it today.