This patch might be useful for successful reception at 300 baud.

It uses longer RX tone filters (at the expense of CPU time).

Signed-off-by: Guido Trentalancia <iz6rdb@trentalancia.com>
---
 afsk/modem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- soundmodem-0.16-orig2/afsk/modem.c	2016-01-31 15:54:04.345972364 +0100
+++ soundmodem-0.16/afsk/modem.c	2016-01-31 15:55:01.695779247 +0100
@@ -43,7 +43,7 @@
  * Rx FIR Filter length is normally equal
  * to 16. Longer filters require more CPU.
  */
-#define RXFILTLEN       16
+#define RXFILTLEN       96
 
 #define RXFILTOVERBITS	3