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

[Glenn Little WB4UIV]

In the TV station we used video distribution amplifiers.
These were one amplifier that fed 8 75 Ohm resistors.
These were one in eight out amplifiers.
The other end of the resistor went to a BNC connector.
Each unused port we terminated with a 75 Ohm load.

I think I can provide schematics if you want.
These worked well to over 10 MHz.

Glenn


On 3/16/2019 2:01 PM, Taka Kamiya via time-nuts wrote:
> 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!
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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
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