[time-nuts] Component level 1:2 splitter

[Brooke Clarke]

Hi Randy:

Do you know that one of the receivers causes a problem for the other one?

It may be that a passive splitter is all you need, like:
http://www.prc68.com/I/4GPS.shtml
To get more isolation you could pad between the splitter and receivers since 
most receivers operate over a large dynamic range.

If you think you will want to run a number of receivers you might consider a 
repeater.  It consists of a high gain amp (about 30 to 50 dB) followed by a 
passive antenna mounted on the ceiling pointing down.  I found that setting the 
receivers side by side where they were toughing each other caused problems, but 
6 inches of separation was all that was needed for isolation.

Have Fun,

Brooke Clarke
http://www.prc68.com/P/Prod.html  Products I make and sell
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randy warner wrote:
> Guys,
> 
> I need to come up with a 0db little splitter to route 1 antenna into 2 GPS
> receivers. To keep the isolation up I want to use an active splitter instead
> of a passive one. I suppose I could use a passive splitter followed by two
> LNA's (one to each receiver), but I would then have to add a lot of
> attenuation to knock the signal back down. I suppose it would work, but the
> noise factor sure wouldn't be optimum.
> 
> Does anyone out there know of a single/dual IC solution to this? Everything
> I have found LNA wise is in the 10-30 dB range. Note that this will be a
> board mounted circuit and I don't have to worry about connectors, etc. I'm
> hoping to find a little solution that I can cover with one of Laird's
> standard shield cans.
> 
> Thanks,
> 
> Randy Warner
> 
> 
> 
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