[time-nuts] Distribution Amp

Magnus Danielson cfmd at bredband.net
Sat Sep 24 18:32:37 EDT 2005

From: xaos <xaos at darksmile.net>
Subject: Re: [time-nuts] Distribution Amp
Date: Sat, 24 Sep 2005 13:21:33 -0400
Message-ID: <43358B1D.9030501 at darksmile.net>

> This unit might be 75Ohms.

This unit is 75 Ohm. The user guide is on the web.



> George, N2FGX
> Mike Feher wrote:
> >This is for general information in case someone else needs an inexpensive
> >distribution amplifier for a frequency source. Just yesterday I received the
> >following distribution amp that I purchased on ebay -
> >http://tinyurl.com/bqalz . So far I have only completed some minimal
> >testing, as I am in the process of moving my lab but satisfied myself that
> >this would really do the job nicely. As you can see on the ebay ad it is
> >made for HDTV. It has 3 inputs and each input has six outputs. The inputs
> >can be DC or AC coupled. The testing I performed was at 10 MHz. I fed it
> >with one of my rubidiums with about a 7.8 dBm signal. The output on each of
> >the six output channels was about 7.3 dBm. This was the same regardless of
> >the input used or the output measured or of any loading on the other
> >outputs. It will be ideal to drive a bunch of test equipment simultaneously
> >from the same source. I did not yet measure any input to output phase shift
> >or output to output phase difference. Besides, as long as it is constant I
> >do not care. The outputs are also not isolated, but for what I want it for
> >that is OK as well. I intend to put an amplifier and a splitter on the
> >rubidium so I can drive all three ports at once giving me 18 frequency
> >correlated outputs. I am very pleased with the purchase. It is also small,
> >another benefit. I did not see any increase in the noise floor as compared
> >to the rubidium, nor did I see any extraneous spurious. The output, except
> >for the minimal signal loss was essentially identical to the input. 73 -
> >Mike 
> >
> >
> > 
> >Mike B. Feher, N4FS
> >89 Arnold Blvd.
> >Howell, NJ, 07731
> >732-886-5960
> > 
> > 
> >
> >
> >
> >
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> >
> >
> >  
> >
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