Install secondary GPS

I did provide a reinforced location on the top skin for a second GPS. The indications are that this is the best location for a GPS antenna - Midwest report issues in mounting any antenna near to or in front of the firewall. I am now installing Flarm which does require a GPS antenna which outputs a RF signal. A compatible antenna is the Rami AV801 which incorporates an active RF front-end. So this is the trigger for mounting such a second antenna. If in the future I need to install avionics which also requires an amplified active GPS antenna with RF output, this same antenna can be used, with a suitable splitter which takes care of the DC supply issue. The overall noise-figure of the system will not be degraded noticeably by the use of such splitters post the RF front end in the antenna.

https://www.rojone.com.au/wp-content/uploads/2014/11/AMA-2251-1400-SERIES-GPS-2-4-WAY-DIVIDERS-CODE-AMA-2251-1400-2MSDCB-AMA-2251-1400-4MS-ROJONE.pdf

https://www.rojone.com.au/wp-content/uploads/2014/02/AMA-2251-1400-2MSDCB-Datasheet-Rev01.pdf 

This 2nd sheet is garbled. The first sheet (same part) puts it correctly.

"Rojone’s AMA-2251-1400 Series of miniature dividers are specifically designed for space critical GPS applications. One output is AC coupled to the input while the other is DC coupled to allow for two receivers to a single active antenna. The receiver connection to the power divider’s DC path will be able to pass DC to the antenna. The DC current capability is > 500mA."

An important consideration is that once I install the inner arch skin, the opportunity to add a second GPS antenna is basically lost. So I decided to act now