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

[Paul Bicknell]

Hi just a thought 

Video distribution amps for analogy video have been talked about 
Video is typically 7 mhz  so they should work OK 

The input signal is looped to each amplifier input and terminated on the
last amplifier input with a resistor for video it is 75 ohm but for a
reference signal it is 50 ohm

The amp output is normally fed via a 75 ohm resister so this will have to be
changed internally for a 50 ohm

The phase change through the amps will have to be measured but if all amps
are the same and only signals from the amps are used all phases differences
between the different outputs should be very low and they might not even be
easily measured 

Cct diagrams and descriptions are available in the older BATC CQ TV  books 

Regards Paul 

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of
Attila Kinali
Sent: 16 March 2019 20:27
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps

On Sat, 16 Mar 2019 18:01:36 +0000 (UTC)
Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:

> 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.

Amplify - split - amplify.

The first amplifier is there to compensate for the loss of the splitter.
You might want to add additional attenuators between the splitter
and the output amplifiers for increased isolation between channels.

> Have anyone run into this kind of thing?  Is there an existing design?  
> Anything anyone would like to share?

Anders Wallin has a design that seems to work very well:
http://www.anderswallin.net/2017/01/frequency-distribution-amplifier-2017-01
/
(His blog is worth watching, he does some very nice electronics)

			Attila Kinali

-- 
<JaberWorky>	The bad part of Zurich is where the degenerates
                throw DARK chocolate at you.

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