Updated Chroma Series SubGhz Tags (markdown)

Chroma-Series-SubGhz-Tags.md

@@ -97,6 +97,49 @@ If you like you can jumper pins 2 and 9 on the CC-Debugger to power the
 tag from the debugger to prevent having to have batteries installed while 
 programming.
 
+## Configuring a SubGhz Channel
+
+Unlike the 2.4 Ghz band the frequencies used in SubGhz band are not standarized 
+world wide. 
+
+Generally speaking the 868 MHz range is used in Europe and the 915 Mhz range is
+used in North America and Australia.
+
+The Open Elink project supports 5 channels in each of these bands, it is up
+to the user to configure the system to use a channel which is legal in their
+country.
+
+The SubGHz radio is an optional module that can be added to an AP to provide 
+SubGhz support.  
+
+Currently the OEPL AP firmware only supports the TI CC1101 
+module connected to an AP based on the ESP-C6 (Yellow AP, Mini AP v3 or 
+Mini AP v4).
+
+If the ESP-C6 detects the CC1101 module the Settings tab on the Open EPaper
+Link Access Point web page will show the SubGhz channel drop down selection 
+box.  
+
+SubGhz is disabled by default.
+
+![subgig_disabled](https://github.com/jjwbruijn/OpenEPaperLink/assets/4642629/e21cb9cd-8088-4ebf-9060-d0cccf246ea1)
+
+If your AP has a CC1101 module and SubGhz channel selection is not shown
+make sure your AP firmware has SubGhz support and that you have cleared
+your browse's cache. 
+
+If the SubGhz channel selection is stil not shown after clearing the cache
+and refreshing the page then something is wrong.
+
+Select a channel appropriate for your country from the drop down list.
+
+![subgig_selecting](https://github.com/jjwbruijn/OpenEPaperLink/assets/4642629/fb93aa54-0168-4571-81d4-489846567a4c)
+
+Save the new settings, SubGhz communications are now active and SubGhz tags
+should be able to connect.
+
+![subgig_saved](https://github.com/jjwbruijn/OpenEPaperLink/assets/4642629/89bf005e-9fa1-4b25-944c-9408cf2d67c1)
+
 ## Debug Serial port Connections
 
 Connecting a serial port to the Chroma is very handy for development 
@@ -116,3 +159,4 @@ systems and supports a wide range of baudrates.
 |J3  | GND | Black |
 |TP7 | Serial out Chroma -> PC | Yellow |
 |TP9 | Serial in PC -> Chroma<br>**Optional** | Orange |
+