make speechTX more polite and more verbose

examples/SpeechTX/SpeechTX.ino

@@ -2,6 +2,10 @@
  * Example: SpeechTX - This example used the basic JustTransmit example from the above site
  * This example uses the Talkie Arduino speech library. It transmits pre-encoded speech over the air.
  * More info at: https://github.com/going-digital/Talkie
+ * 
+ * Make sure you're using an Arduino Uno or equivalent. The Talkie library doesn't work
+ * with hardware that doesn't use the ATMega328 or ATMega168.
+ *
  * Connect the HamShield to your Arduino. Screw the antenna 
  * into the HamShield RF jack. Connect the Arduino to 
  * wall power and then to your computer via USB. After 
@@ -251,7 +255,10 @@ void setup() {
   radio.setRfPower(0);
   radio.frequency(145010);
 
+  radio.waitForChannel(); // wait for the channel to be empty
+  
   radio.setModeTransmit();
+  delay(100); // wait for PA to come up
   voice.say(spKILO); // to change these to the words you would like to say, or a ham radio call sign - uncomment above encoded words
   voice.say(spSIX);  // more word choices can be found at the talkie github site
   voice.say(spALPHA);
@@ -266,11 +273,9 @@ void setup() {
   voice.say(spIS);
   voice.say(spON);
   voice.say(spFIRE);
-  
+
+  radio.setModeReceive();  
 }
 
 void loop() {
-  radio.frequency(144025);
-  radio.setModeTransmit();
-  for(;;) { }
 }

src/HamShield.cpp

@@ -1682,7 +1682,7 @@ Does not take in account the millis() overflow
    
 */
 
-bool HamShield::waitForChannel(long timeout = 0, long breakwindow = 0, int setRSSI = HAMSHIELD_EMPTY_CHANNEL_RSSI) { 
+bool HamShield::waitForChannel(long timeout, long breakwindow, int setRSSI) { 
     int16_t rssi = 0;                                                              // Set RSSI to max received signal
     for(int x = 0; x < 20; x++) { rssi = readRSSI(); }                            // "warm up" to get past RSSI hysteresis 
     long timer = HSmillis() + timeout;                                              // Setup the timeout value

src/HamShield.h

@@ -515,7 +515,7 @@ class HamShield {
         char parseMorse(uint8_t rx_morse_char, uint8_t rx_morse_bit);
 		uint8_t morseLookup(char letter);
 		uint8_t morseReverseLookup(uint8_t itu);
-        bool waitForChannel(long timeout, long breakwindow, int setRSSI);
+        bool waitForChannel(long timeout = 0, long breakwindow = 0, int setRSSI = HAMSHIELD_EMPTY_CHANNEL_RSSI);
         void SSTVVISCode(int code);
         void SSTVTestPattern(int code);
         void toneWait(uint16_t freq, long timer);