[time-nuts] GPS from a window seat

Magnus Danielson magnus at rubidium.dyndns.org
Fri Oct 2 02:30:37 UTC 2009


jmfranke wrote:
> I used a bias tee with a capacitor block.  I varied the resistor until I 
> could see signals coming from the external antenna, the built in patch 
> was shielded with aluminum foil and the receiver verified that no 
> signals were coming from the internal antenna.  Some receivers needed 
> only a 10K resistor, some models needed 220 Ohms.

In my case I still want it to pass 5 VDC, but let the receiver see some 
additional current, so I put a coil in series with the resistor, to not 
load the RF too much.

Cheers,
Magnus



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