===== A7105 =====
The A7105 module is necessary to support the Flysky protocol (also used by WLToys V911, V9x9, and Xeida 99x8) and the Hubsan X4 protocol.
It is possible to scavenge this module from a WLToys Flysky protocol transmitter, an Xeida 99x8 transmitter, or to purchase it standalone.

The XL7105-D03 is an A7105 transceiver with an integrated power-amp providing 17dBm of output power.  It can be obtained from Ebay or Aliexpress.  Typical search term: ‘A7105-500m’

I have run a range test comparing the XL7105-D03 and V911-Tx modules.  In both cases I set the Tx on the ground, the antenna was inside the Tx and was bound to the V911. I then walked until the light on the V911 would flash intermittently. The path was line-of sight, but along the edge of the woods, so not exactly a wide open field.

Using the V911 Module: range = 600ft
Using the aliexpress module: range = 650ft
The XL7105-D03 is rated at 500M, but at least with my setup, I didn’t see any where near that distance.

The Xeida module is similar to the WLToys modules, except that it has an antenna on the board, instead of a small attached antenna. A range test similar to the XL7105-D03 and V911-Tx modules (different location, different V911, different Tx) gave a range of about 100 ft.

==== XL7105-D03 ====
Link: http://www.ebay.com/itm/181091377178

{{https://bitbucket.org/repo/Ag6rxe/images/2956021120-XL7105-D03.jpg}}

*4.0.1 and earlier: Connect 8->GND and 9->3.3V.  Leave 6 and 7 floating

After 4.0.1, connect 6->9 and 7->8
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==== V911 ====
Link: [[:rf_module_installation:remove_v911|V911ModuleRemoval]]

{{https://bitbucket.org/repo/Ag6rxe/images/454457668-A7105-V911.jpg}}
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==== Xeida ====
Link: Similar to [[:rf_module_installation:remove_v911|V911ModuleRemoval]]

{{https://bitbucket.org/repo/Ag6rxe/images/1750415647-CC-958TG.png}}
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==== XL7105-SY ====
Link: http://www.ebay.com/itm/171154521980

{{https://bitbucket.org/repo/Ag6rxe/images/312503663-XL7105-SY.jpg}}