[time-nuts] Distribution Amp

xaos xaos at darksmile.net
Sat Sep 24 13:21:33 EDT 2005

This unit might be 75Ohms.

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 B. Feher, N4FS
>89 Arnold Blvd.
>Howell, NJ, 07731
>time-nuts mailing list
>time-nuts at febo.com

More information about the time-nuts mailing list