[time-nuts] REF osc distribution.

[Bob Camp]

Hi

There are a number of discrete transistor buffers that have very good
isolation and short term stability / phase noise performance. I'd take a
look at the one from the NIST papers and Bruce's more modern re-design.  All
are in the archives. http://tf.boulder.nist.gov/general/pdf/498.pdf is a
pretty good place to start.

Mostly what they do is to run a common emitter amplifier followed by several
common base amplifiers. They may or may not follow that with a buffer. Each
channel gets a separate string of amplifiers. All the common emitter amps
are driven in parallel by the reference source.

The transistors used are normally cheap stuff like the 2N3904. Except for
the power supply nothing in the circuit costs much. None of it is hard to
find.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rui Martins
Sent: Wednesday, September 05, 2012 10:19 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] REF osc distribution.

Bob and Paul,

 

I have at moment 6 equipment's maximum which I want sync with 10MHZ only.

The video distribution is an idea but the kit from Ve2zaz have other way but
the problem is the isolation.

I have 2 independent Nortel GPSTM but I don't need redundancy for the job.

G3ruh and ve2zaz Kits and rubidium oscillators only for analyzing the data
and compare.

I will use one of them with a doubler to get 20MHZ for driving a transceiver
(Crazy huh).

Any ideas will be considered.

 

Regards

 

CT1EBH

Rui Jorge Martins

Proudly user of FT-ONE, FT-980, FT736R, FT726R, FT-2000 and FL-7000

73!

 

 

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