srsLTE: fix ZMQ RF module gain

lib/src/phy/rf/rf_zmq_imp.c

@@ -207,10 +207,10 @@ int rf_zmq_open_multi(char* args, void** h, uint32_t nof_channels)
     *h                        = handler;
     handler->base_srate       = ZMQ_BASERATE_DEFAULT_HZ; // Sample rate for 100 PRB cell
     handler->rx_gain          = 0.0;
-    handler->info.max_rx_gain = +INFINITY;
-    handler->info.min_rx_gain = -INFINITY;
-    handler->info.max_tx_gain = +INFINITY;
-    handler->info.min_tx_gain = -INFINITY;
+    handler->info.max_rx_gain = ZMQ_MAX_GAIN_DB;
+    handler->info.min_rx_gain = ZMQ_MIN_GAIN_DB;
+    handler->info.max_tx_gain = ZMQ_MAX_GAIN_DB;
+    handler->info.min_tx_gain = ZMQ_MIN_GAIN_DB;
     handler->nof_channels     = nof_channels;
     strcpy(handler->id, "zmq\0");
 

lib/src/phy/rf/rf_zmq_imp_trx.h

@@ -39,6 +39,8 @@
 #define ZMQ_TIMEOUT_MS (1000)
 #define ZMQ_BASERATE_DEFAULT_HZ (23040000)
 #define ZMQ_ID_STRLEN 16
+#define ZMQ_MAX_GAIN_DB (90.0f)
+#define ZMQ_MIN_GAIN_DB (-90.0f)
 
 typedef enum { ZMQ_TYPE_FC32 = 0, ZMQ_TYPE_SC16 } rf_zmq_format_t;