A couple links on what Bob is referencing: http://www.ko4bb.com/~bruce/IsolationAmplifiers.html
http://www.ke5fx.com/norton.htm On 9/5/2012 9:46 AM, Bob Camp wrote:
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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Rui Martins Sent: Wednesday, September 05, 2012 10:19 AM To: time-nuts@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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