RF 433MHz Rx/Tx: Not Communicating

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I have the same problem !
Arduino Mega2560+Arduino Nano+rf 433Mhz
for two days I'm working on this and I can't make a connection.
none of the libraries seem to work . tested Radiohead , virtual wire and etc.
how should I know if the sender or receiver are ok?
does anyone have any suggestion about how I can send and receive data using these items?

Kuzou:
Hello everyone! I am working on my project where I can send data from using wireless. I am using RF 433MHz Rx/Tx. I have used a lot of examples using RadioHead library and VirtualWire library, however, I can't seem to communicate the Rx and Tx.

For my Transmitter I am using Arduino Nano, and for my receiver I am using Arduino Mega2560.
Apparently I am using this code but still not working:

For Receiver:

Serial.begin(9600);

Serial.println("Device is ready");
// Initialize the IO and ISR
vw_setup(2000); // Bits per sec
vw_rx_start(); // Start the receiver
}
void loop()
{
if (vw_get_message(message, &messageLength)) // Non-blocking
{
Serial.print("Received: ");
for (int i = 0; i < messageLength; i++)
{
Serial.write(message[i]);
}
Serial.println();
}
}




For Transmitter:

// transmitter.pde
//
// Simple example of how to use VirtualWire to transmit messages
// Implements a simplex (one-way) transmitter with an TX-C1 module
//
// See VirtualWire.h for detailed API docs
// Author: Mike McCauley (mikem@airspayce.com)
// Copyright (C) 2008 Mike McCauley
// $Id: transmitter.pde,v 1.3 2009/03/30 00:07:24 mikem Exp $

#include <VirtualWire.h>

void setup()
{
    Serial.begin(9600);   // Debugging only
    Serial.println("setup");

// Initialise the IO and ISR
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000); // Bits per sec
}

void loop()
{
    const char *msg = "hello";

digitalWrite(13, true); // Flash a light to show transmitting
    vw_send((uint8_t *)msg, strlen(msg));
    vw_wait_tx(); // Wait until the whole message is gone
    digitalWrite(13, false);
    delay(200);
}




I need your help! Thanks!