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 <[email protected]> wrote:
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps To: "Taka Kamiya via time-nuts" <[email protected]> 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 -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. -----Inline Attachment Follows----- _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
