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-[Encoder receiver transmitter](https://en.wikipedia.org/wiki/Encoder_receiver_transmitter) (ERT) is a packet radio protocol developed by Itron for automatic meter reading. The system uses OOK short range radio which is transmitted in the unlicensed 900-920 MHz band, so that meters can be read from a passing vehicle. This is mainly used in USA. 
+[Encoder receiver transmitter](https://en.wikipedia.org/wiki/Encoder_receiver_transmitter) (ERT) is a packet radio protocol developed by Itron for automatic meter reading of water, gas and electricity. The system uses OOK short range radio which is transmitted in the unlicensed 900-920 MHz band, so that meters can be read from a passing vehicle. This is mainly used in USA. The data is not encrypted, and does not have functions to enable full control. The system is not as advanced as a smart meter and lacks the control or  security in the data transfered.
+ERT
+
+The Key Items on the App that can be selected with the cursor and changed with the encoder knob are:
+
+* **Title bar:** The usual Items may be changed and displayed.
+* **Gain:** Setting are shown in order of AMP 0=0db or 1=14dB, LNA(IF) (0-40) and VGA (Baseband Gain) (0-62).
+* **ID:** this is the meter ID.
+* **Tp:** This is the type of meter. 0=Unknown,1 =IDM, 2=SCM.
+* **Consumpt:** The Meter reading value.
+* **Cnt:** The count of the number of readings.
+
+The PortaPack ERT receiver monitors approximately 2.5 MHz centered around 911.6 MHz. It does not implement channel filters, so sensitivity is reduced in exchange for monitoring more simultaneous "channels".
+
+If a FAT-formatted micro SD card is present when this mode is entered, the receiver will log received packets to a file named "ERT.TXT". The log file contains one line per packet received. Each line consists of a timestamp in sortable "YYYYMMDDHHMMSS" format, the Manchester-decoded data bits, a "/", and a per-bit Manchester coding error indicator ("1" if the data bit is in error). 
+
+
 
-The data is not encrypted, and does not have functions to enable full control. The system is not as advanced as a smart meter and lacks the control or  security in the data transfered.