[time-nuts] Distribution amplifier for 10MHz and 1 pps

[JF PICARD]

The main problem in the distribution amplifiers for 10 Mhz is phase noise. There are two appoaches :
the first one with a tuned amplifier like HP 5087A distribution amplifier. have a look at the manual
the second one is the Racal 9478 wit phase locked VCO.
For 1PPs the main goal is jitter and the selection of the ICs is very tricky
--------------------------------------------
On Sun, 3/17/19, Joakim Langlet <joakim.langlet at seaview.se> wrote:

 Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps
 To: "Taka Kamiya via time-nuts" <time-nuts at lists.febo.com>
 Date: Sunday, March 17, 2019, 7:55 AM
 
 Hi,
 
 I used a monolithic amp for 10MHz (and 20 MHz)
 in my design. Since it is 
 driven directly
 from a digital signal it uses a low-pass filter at its 
 input. I used a Mini-circuits splitter at the
 output. I have enclosed a 
 part of the
 drawing.
 
 In my case, I have
 two amplifiers (driven from two 180 degrees separated 
 signals) and four outputs. The level at each
 output is high enough to 
 use an external 1
 by 4 splitter on the outside of the box. This gives me 
 16 possible 10 MHz signal to instruments. I
 have never used this many of 
 course.
 
 Just as an example.
 
 Regards,
 Joakim Langlet (SM0OET)
 
 
 Den 2019-03-16 kl. 19:01, skrev Taka Kamiya via
 time-nuts:
 > Hello....
 > I am thinking about distribution amplifier
 of a sort.  Not a kind with 8 or more output but just 2 or
 3.
 >
 > As you know,
 most timing equipment comes with just one output of a
 kind.  Say one 10MHz and 1 PPS.  This is rather
 inconvenient. If I want to scope it without disturbing the
 setup, I cannot.  On my home brew Rb setup, I made sure I
 am going to put in 2 of each.
 > 1 pps was
 easy.  Use 74HC04N.  Signal comes into a register and to
 one inverter.  Output of this inverter goes to all input of
 channel amplifiers.  Each channel consists of parallel
 inverters with output going to resisters, then tied
 together. Works well.  (amplifier meaning NOT gate)
 >
 > But how do I do this
 on 10MHz side?  I'd like to have minimal distortion
 (sine wave) and high isolation.  I acquired a few signal
 splitter and monolithic amplifiers.  Split first and
 amplify?  Amplify first and split?  Remember it's only
 2 to 3 channels.  Amplifier module has too much gain, so
 I'll probably have to use attenuators.
 >
 > Have anyone run into
 this kind of thing?  Is there an existing design? 
 Anything anyone would like to share?
 >
 > ---------------------------------------
 > (Mr.) Taka Kamiya
 >
 I'm stuck in a wormhole....  Hello, worms!
 >
 _______________________________________________
 > time-nuts mailing list -- time-nuts at lists.febo.com
 > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 > and follow the instructions there.
 _______________________________________________
 time-nuts mailing list -- time-nuts at lists.febo.com
 To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
 and follow the instructions there.
 
 -----Inline Attachment Follows-----