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

steve heidmann steveheidmann at yahoo.com
Fri Jun 8 16:21:48 UTC 2012


Is it worth driving from Thousand Oaks to Altadena for  Snowcones  (qty 5) tomorrow ?

--- On Fri, 6/8/12, Jim Lux <jimlux at earthlink.net> wrote:


From: Jim Lux <jimlux at earthlink.net>
Subject: Re: [time-nuts] Procom GPS4 quadrifilar antenna...
To: time-nuts at febo.com
Date: Friday, June 8, 2012, 6:23 AM


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".



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