Update README

README.md

@@ -5,6 +5,8 @@ Before you transmit, know your laws. **rpitx** has not been tested for complianc
 _Created by Evariste Courjaud F5OEO. Code is GPL_
 
 # Installation
+Assuming a standard install of Raspbian:
+
 ```sh
 git clone https://github.com/F5OEO/rpitx
 cd rpitx
@@ -13,13 +15,13 @@ cd rpitx
 ./install.sh
 ```
 # Hardware
-Plug a wire on GPIO 18, means Pin 12 of the GPIO header ([header P1](http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29)). This acts as the antenna. The optimal lenght of the wire depends the frequency you want to transmit on, but it works with a few centimeters for local testing.
+Plug a wire on GPIO 18, means Pin 12 of the GPIO header ([header P1](http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29)). This acts as the antenna. The optimal length of the wire depends the frequency you want to transmit on, but it works with a few centimeters for local testing.
 
 # Short manual
 ## General
 **rpitx** is the main software to transmit. It allows to transmit from:
 - **IQ** files *.iq (can be generated by external software like [GNU Radio](http://gnuradio.org/)).
-- **Frequency/Time** files *.ft (generally used to easily implement digital modes)  
+- **Frequency/Time** files *.ft (generally used to easily implement digital modes)
 
 Usage:
 ```
@@ -27,23 +29,23 @@ rpitx [-i File Input][-m ModeInput] [-f frequency output] [-s Samplerate] [-l] [
 -m            {IQ(FileInput is a Stereo Wav contains I on left Channel, Q on right channel)}
               {IQFLOAT(FileInput is a Raw float interlaced I,Q)}
               {RF(FileInput is a (double)Frequency,Time in nanoseconds}
-       	      {RFA(FileInput is a (double)Frequency,(int)Time in nanoseconds,(float)Amplitude}
-	      {VFO (constant frequency)}
+              {RFA(FileInput is a (double)Frequency,(int)Time in nanoseconds,(float)Amplitude}
+               {VFO (constant frequency)}
 -i            path to File Input
 -f float      frequency to output on GPIO_18 pin 12 in khz : (130 kHz to 750 MHz),
 -l            loop mode for file input
 -p float      frequency correction in parts per million (ppm), positive or negative, for calibration, default 0.
--d int 	      DMABurstSize (default 1000) but for very short message, could be decrease
+-d int        DMABurstSize (default 1000) but for very short message, could be decrease
 -c 1          Transmit on GPIO 4 (Pin 7) instead of GPIO 18
 -h            help (this help).
 ```
 
 ## Modulation samples
 Some modulations are included in this repository and can be easily extended. These scripts create files which can be used by rpitx.
-Some output in IQ (like ssb) other in FT (like sstv).
+Some output in IQ (like SSB) other in FT (like SSTV).
 
-### SSB modulation
-**pissb** converts an audio file (Wav 48KHZ mono only!) to SSB (USB right now) and outputs it
+### Single Side Band modulation (SSB)
+**pissb** converts an audio file (Wav 48KHZ mono only!) to [SSB](https://www.sigidwiki.com/wiki/Single_Sideband_Voice) (Upper Side Band right now) and outputs it
 to an IQ file.
 Assuming your audio file is in your current working directory:
 ```sh
@@ -55,7 +57,7 @@ sudo ./rpitx -m IQ -i ssbIQ.wav -f 50000 -l
 ```
 A sample script `testssb.sh` is included.
 
-### FM modulation
+### Frequency Modulation (FM)
 **pifm** converts an audio file (Wav, 48KHz, 1 channel, pcm_s16le codec) to Narrow band FM (12.5khz excursion) and outputs it to a .ft file.
 Assuming your audio file is in your current working directory
 ```sh
@@ -67,8 +69,10 @@ sudo ./rpitx -m RF -i fm.ft -f 100000 -l
 ```
 A sample script : `testfm.sh` is included.
 
-### SSTV
-**pisstv** converts an RGB picture to an SSTV .ft file.
+### Slow Scan Television (SSTV)
+**pisstv** converts an RGB picture to a [SSTV](https://www.sigidwiki.com/wiki/SSTV) .ft file.
+The SSTV module will transmit using the Martin M1 encoding mode.
+
 If you have a JPEG picture 320x256 you can convert it to an RGB picture with:
 ```sh
 imagemagick convert -depth 8 picture.jpg picture.rgb
@@ -83,12 +87,14 @@ sudo ./rpitx -m RF -i picture.ft -f 100000
 ```
 A sample script `snapsstv.sh` grabs a picture from a PiCamera and then transmits it on 50.105 MHz.
 
-### FSQ
-**pifsq** allows to send a text with the new FSQ modulation
+### Fast Simple QSO (FSQ)
+**pifsq** allows to send a text with the new [FSQ](https://www.sigidwiki.com/wiki/FSQ) modulation
+
 It is still under development.
+
 A sample script `testfsq.sh` allows to send a text with FSQ
 
-### VFO
+### Variable Frequency Offset (VFO)
 A **VFO** mode is provided to allows precise frequency resolution.
 For example to set a carrier on 100MHz (please set a correct frequency to be legal)
 ```sh