FSK Receiver - RF Cafe Forums

RF Cafe Forums closed its virtual doors in late 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2012, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts. Here is the full original RF Cafe Forums on Archive.org

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 Post subject: gps repeater
Posted: Wed Aug 17, 2011 12:18 pm 
 
Lieutenant

Joined: Mon Aug 15, 2011 6:41 pm

Posts: 2

Hi !!

I´m trying to build a gps repeater with mga8657 rf amplifier.

I´m using the layout provided in its datasheet and so far there is no way to receive gps signal on a ET332 gps module from inside a building.

Circuit details:

(I´m not using the input inductance to improve NF, just the 50ohm stripline)

DC blocking capacitors: 33pF

Vd bypass capacitor: 220pF

R1: 100ohm

Vd: 7V

At the output there is a patch antenna of 45 x 46 mm and it is feeded at a point where it has 50ohm approx.

If someone could take a look at the datasheet and give me some guidance I´d really appreciate it.

Thanks !!

Posted  11/12/2012