CC2530: Zigbee Module Transmitting & Receiving Power and Range is very poor

/****************************************************************************
* �� �� ��: main.c
* ��    ��: Andy
* ��    ��: 2013-01-08
* ��    ��: 1.0
* ��    ��: ���ô��ڵ������ֲ����ʣ�115200bps 8N1
*           ���ڵ������ָ�CC2530���ַ���ʱ��������᷵�ؽ��յ����ַ���
****************************************************************************/
#include <ioCC2530.h>
#include <string.h>
#include <stdio.h>






//..............................................................................
void initUART(void) //sets all configurations in UART
{
        CLKCONCMD = CLKCONSTA & 0xB8; //clock control
       //CLKCONCMD &= ~0x40;                        //����ϵͳʱ��ԴΪ32MHZ����
 
       while(CLKCONSTA & 0x40);                   //�ȴ������ȶ�Ϊ32M
        CLKCONCMD &= ~0x47;                        //����ϵͳ��ʱ��Ƶ��Ϊ32MHZ   

 // CLKCONCMD = CLKCONSTA & 0xB8; //clock control
//   while(CLKCONSTA & 0x40); 


   PERCFG |= 0x02; // Configure UART1 for Alternative 2 => Port P1 (PERCFG.U1CFG = 1)

// P1SEL.SELP1_4/5/6/7 = 1 => CT = P1_4, RT = P1_5, TX = P1_6, RX = P1_7 
   P1SEL |= 0xF0;
// Configure relevant Port P0 pins back to GPIO function 
   P0SEL &= ~0x3C;

   U1CSR |= 0x80; // USART mode = UART (U1CSR.MODE = 1) 
   U1CSR |= 0x40;//0xC0; //UART mode selected for USART1.
   //U1UCR |= 0x00; //H/w flow control disabled

   U1GCR = 8;	//for 9600			       
   U1BAUD = 0x3B;           //9600
 // DMA Rx is always on (self-resetting). So flow must be controlled by the S/W polling the Rx
 // buffer level. Start by allowing flow.
#if 0
    P1 &= ~0x20;//HAL_UART_Px_RTS;
    P1DIR |=  0x20;//HAL_UART_Px_RTS;
// Trigger an interrupt on CTS input (enabled in HalUARTSuspendDMA).
    P1IFG &= ~0x10;
    P1IEN &= ~0x10;
    P0IE = 1;
#endif

}
//..............................................................................
char receive (void) 
{
     U1CSR |= 0x40;
     URX1IF = 0;      //interrupt flag
     while (!URX1IF ); 
         U1DBUF; //USART 0 Receive/Transmit Data Buffer
     URX1IF = 0;
return U1DBUF;
}
//..............................................................................
void send(unsigned char c) 
{ 
     UTX1IF = 0; 
     U1DBUF = c; 
     while (!UTX1IF); 
         UTX1IF = 0; 
}
//..............................................................................
void main()
{ 
       int i=0;
       initUART(); 
       

       while(1)
       {
          unsigned char uartdat;
      


          for (i=0;i<10;i++){
             uartdat='2';
             send(uartdat);
          }

          for (i=0;i<10;i++)
          uartdat=receive();
         
       }
}