J型发射天线计算器
J型天线是一种常见的天线类型，其结构类似于字母“J”，因此得名。J型天线主要用于无线通信、广播、雷达等领域。如果需要计算J型天线的一些参数，可以使用以下计算器：
Because of its simple production and easy material selection, J-type antenna has been favored by FM transmitter enthusiasts. It can be used with air-conditioning copper tubes of about 1 mm. It can be produced according to the calculated size and can achieve good results without professional tools. If you can't find the copper tube, you can also make it with 2.5 square copper wire.