在GNU Radio中生成预定义方波信号失败的技术求助

我尝试在GNU Radio中生成由0和1组成的预定义方波信号，但多次尝试均失败。使用的Python Block代码如下：

def work(self, input_items, output_items):
    
    n_2= '1111010111010111000100000001001100000101011100110101010000011011100111011011110101001111110110011110100110110010000010100000110101011001110100010100010011000101010010111100011110010011010101010011100111010010111001110101100000010000111110110101000111100100100101000000100100111010000010100001100111011101011110011100011100001100010110101001100011100101011001010111101010100101011110000000100101110111011101111110100001101011110011000100011001010001110011000111001011110010111110010111010011011100011101100110111000000111101011101010001111010000101101010101011111101111010000101111111101010111111001101010010110001110100000000101001101011000110011101001001001010111011001101001000100110011101100011000111110000000111111011011110111111011001110001100010101010010010011000111111110110001110111100000011110011000010000100100100000101001100100001101111101011000111101110010001100100001110110010010000000011111100010010111100111101010101100010101100110110010011001111001110010011110100101011010101001101101010100110100010101101100000011011111011101011100001010110100001100010110110100011110001000110000100100100001011010001000001010000101010000100101001110100001111110100110000011001010001011001001010011101100111000000001001111100010101010001100100101000011001101000001111001111101100111100101101010000100011001001011001110101101010000000111111000001010111001000110010111000011111000111101110100011011111001100000101010001100001111010101000011111000001100010101001101100100000000011110011101110110101111100000001010100110000001000010111111000100101000100111101011110110010100111111000011001111110001001101010011010000000100111111000100010101001100010000011110001000110101101000110010101110101011010011111011001100110011000101001100110000010110000111111010110011110000100010101000010100010110011111110010001110011011111100110011101001110011011110100001001001101001010010000001011110011100001100011011010110011011010001001001011000000101001101011010011000110111010000111011101011111111101010111001010010110011000110010111000101110010000100111011101101115'
    n_2  = np.array(list(n_2))
    n_2 = n_2.astype(np.float32)
    input_items[0] = input_items[0][:2047]
    for i in range(0, len(input_items[0])):
        
        output_items[0][i] = input_items[0][i] * n_2[i]
    
    
    return len(output_items[0])

• 初始测试：输入标准周期性方波信号，预定义序列末尾以“5”作为结束位，输出信号与预期不匹配——结束位峰值后本该输出四个1，实际却出现0电平。
• 后续修改尝试：
  • 将输入改为恒定源，问题未解决；
  • 添加起始位“3”后，输出彻底异常：结束位“5”多次重复，且起始位与结束位本该连续，结果被大量无效位分隔。

内容的提问来源于stack exchange，提问作者Mohamed Abduljawad