Merge pull request Hamlib#1703 from CallumMcEwen/master

Updates to codan_set_ptt command and README.md

Author: N0NB

rigs/codan/README.codan

@@ -9,3 +9,8 @@ programming.  This is most often the GP (general purpose) port which
 is a 15-pin D-Sub connector on a flying lead on the back of the radio.
 (NGT and Envoy models).  Programming must be set to select "CICS" as
 the device which is addressed via the GP port.
+
+As of SDR firmware V3.51 for Envoy and Sentry radios, the Amatuer option
+allows for Freetune Tx on ham bands only. Freetune Tx is no longer required
+for this rig file to work.
+VK5MCA

rigs/codan/codan.c

@@ -469,6 +469,10 @@ int codan_get_ptt_2110(RIG *rig, vfo_t vfo, ptt_t *ptt)
 /*
  * codan_set_ptt
  * Assumes rig!=NULL
+ *
+ * VK5MCA
+ * Changing PTT activation from 'connect tcvr rf ptt %s' to CICS command 'ptt %s voice'.
+ * This sets fast ALC and allows audio to pass to the transmitter via the GPIO port.
  */
 int codan_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 {
@@ -478,7 +482,7 @@ int codan_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
     rig_debug(RIG_DEBUG_VERBOSE, "%s: ptt=%d\n", __func__, ptt);
 
-    SNPRINTF(cmd_buf, sizeof(cmd_buf), "connect tcvr rf ptt %s\rptt",
+    SNPRINTF(cmd_buf, sizeof(cmd_buf), "ptt %s voice\rptt",
              ptt == 0 ? "off" : "on");
     response = NULL;
     retval = codan_transaction(rig, cmd_buf, 0, &response);