[hpsdr] [Hpsdr] Call for Comments - ALEX

[Ray J]

The GALI-74  looks a bit better than the MAV-11 ... I think these are 
more power amp parts,  not really LNA parts...

But I would imagine that we do not need the sub half db noise figure 
stuff... with cavity filters .. ect... that would be a little extreme 
and quite pricey..


http://www.minicircuits.com/pages/s-params/GALI-74+_VIEW.pdf
http://www.minicircuits.com/pages/s-params/MAV-11+_VIEW.pdf

Ray J


> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>> I still need a design for a 6 meter LNA.  Do you something that might be
>> appropriate to use here?
>> Anyone?  If not, I am going to use a 50 Ohm gain block with noise figure
>> below 2.5 dB. I found one
>> with a noise figure below 1 dB that might work.
>>     
>
> What is the target for gain and IP3 for the amp?
>
> One of the h/b transceivers here uses a MAV11 mmic on 6mtrs, this has OIP
> around I think 30dBm and works very well. I use only a simple single pole
> tuned circuit in FRONT of the amp then follow with a four pole Cohn bottom
> inductive coupled BPF.
>
> For really high dynamic range you could look at the Mini-Circuits HELA-10D,
> although its a little pricey at $15. After looking at this I wondered if a
> push pull pair of MAV11`s or similar  would work.
>
> The ATF-107--   range appears to be obsolete. Agilent now appear to be
> AVAGOTECH. They list an interesting P-Hemp part MGA53543, it's over kill on
> noise figure but has exellent dynamic range. I don't know if these Ghz parts
> suffer bath tub curves on noise figure?
>
> Shel CT1IZU
>
>
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