[time-nuts] Procom GPS4 quadrifilar antenna...

[Jim Lux]

On 6/8/12 5:20 AM, Michael Baker wrote:
> Time-nutters--
>
> The Procom website lists the noise-figure of their quadrifilar
> LNA as:
>
> GAIN > 30 dB
> NOISE FIGURE < 3 dB (incl. input filter).
> Typ. approx. 3 dB
> ------------------------------------------------------------
>
> I am a little surprised at this relatively high NF for a
> product in this price category. Even most low-end
> mass-produced consumer grade GPS antennas are
> spec'd at 1.5 to 2.0 dB NF.
>

One thing to check on NF specs is the temperature range over which they 
are valid.  A "consumer" spec might be "at room temperature only", a 
more rigorous spec might be "at -20 to +50C".