[Premium-Rx] Mini-circuit amps

[w8au at sssnet.com]

Use an attenuator at the input. Will improve your IMD a lot.

w8au

At 09:42 PM 11/12/05, Ka9p at aol.com wrote:
>I'm getting ready to fiddle with a MIni-Circuits ZFL-500LN amp ahead of a 
>12 way splitter to use as a poor man's multicoupler.  Because it was all 
>cheap :)
>
>The amp has nominally 20 - 25 db gain or so, which I'd like to reduce to 
>make the system a unity gain set up.  Can anyone hazard a guess what the 
>best approach to doing this might be?  I've considered an attenuator on 
>the output of the amp, but was also curious whether the gain might be 
>usefully varied by reducing the supply voltage, and what effect that might 
>have on noise figure (which is OK at less than 3db) or 3rd order IMD 
>(which ain't very good already at about +14 db).
>
>Thanks for any ideas.
>
>Scott
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