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Amateur Radio Toolkit is the best app for ham radio hobbyists. It contains many calculators to help you design radios and antennas for all your projects.

Tools:
Q code - A list of common Q codes
92 Code - A list of common 92 codes
RST code - A list of RST codes
Coordinate calculator - Find your latitude and longitude by entering your maidenhead square.
Grid square calculator - Find your maidenhead square by entering your latitude and longitude
Distance calculator - Find the distance between two Maidenhead squares
Unit converter - Convert between units
Location - Find your location
Dipole antenna - Calculate the optimal lengths of a dipole antenna for a given frequency
Vertical antenna - Calculate the optimal lengths of a vertical antenna for a given frequency
Cubical quad antenna - Calculate the optimal lengths of a cubical quad antenna for a given frequency
Inverted Vee antenna - Calculate the optimal lengths of an inverted vee antenna for a given frequency
Ground plane antenna - Calculate the optimal lengths of a ground plane antenna for a given frequency
J pole antenna - Calculate the optimal lengths of a J pole antenna for a given frequency
VSWR - Convert between VSWR, Refection coefficient, return loss and mismatch loss
Three element Yagi antenna - Calculate the optimal lengths of a three-element Yagi antenna for a given frequency
Seven-element Yagi antenna - Calculate the optimal lengths of a seven element Yagi antenna for a given frequency
Wavelength frequency converter - Convert between wavelength and frequency
Air core inductor - Calculate the inductance or lengths of an air core inductor
Low pass filter - Calculate the units of an RC or RL LPF circuit
High pass filter - Calculate the units of an RC or RL HPF circuit
Ohm's law - Convert between voltage, current, resistance and power by entering two
Reactance - Calculate the reactance of a capacitor or inductor
Decibel calculator - Convert between decibel values or calculate dB by entering the power or voltage
Voltage divider - Calculate the output voltage or resistance of one resistor
Resistor Color codes - Find the resistance of a resistor by entering the colors of the bands
Resistors in parallel - Calculate the resistance of resistors in parallel
Resistors in series - Calculate the resistance of resistors in series
Capacitors in parallel - Calculate the capacitance of capacitors in parallel
Capacitors in series - Calculate the capacitance of capacitors in series
Coaxial cable - Calculate the properties of a coaxial cable
Morse code
CW abbreviations
NATO phonetic alphabet

You can upgrade to the Pro version to remove all ads and get the following features:

Half wave coax balun - Calculate the optimal length of a half wave coax balun for a given frequency
Narrowband balun - Calculate the inductance and capacitance of a narrowband balun
Small magnetic loop - Calculate the optimal lengths of a small magnetic loop for a given frequency
Full wave loop antenna - Calculate the optimal lengths of a full wave loop antenna for a given frequency
ERP and EIRP - Calculate and convert ERP and EIRP
RMS voltage - Calculate the RMS voltage
Pi attenuator - Calculate the values of the resistors by entering the attenuation and impedance
T attenuator - Calculate the values of the resistors by entering the attenuation and impedance
Inductors in series - Calculate the inductance of inductors in series
Inductors in parallel - Calculate the inductance of inductors in parallel
Doppler shift - Calculate the Doppler shift
业余无线电工具包是火腿无线电爱好者的最佳应用。它包含许多计算器，可帮助您为所有项目设计无线电和天线。

工具：
Q代码 - 常见Q代码列表
92代码 - 常见92代码的列表
RST代码 - RST代码列表
坐标计算器 - 输入您的梅登黑德广场，查找您的纬度和经度。
网格方形计算器 - 输入您的纬度和经度，找到您的梅登黑德广场
距离计算器 - 找到两个梅登黑德广场之间的距离
单位转换器 - 单位之间的转换
位置 - 找到您的位置
偶极天线 - 计算给定频率的偶极天线的最佳长度
垂直天线 - 计算给定频率的垂直天线的最佳长度
立方四方天线 - 计算给定频率的立方四方天线的最佳长度
倒V形天线 - 计算给定频率的倒V形天线的最佳长度
地平面天线 - 计算给定频率的地平面天线的最佳长度
J极天线 - 计算给定频率的J极天线的最佳长度
VSWR - 在VSWR，Refection系数，回波损耗和失配损耗之间转换
三元八木天线 - 计算给定频率的三元八木天线的最佳长度
七元八木天线 - 计算给定频率的七元八木天线的最佳长度
波长变频器 - 在波长和频率之间转换
空芯电感 - 计算空芯电感的电感或长度
低通滤波器 - 计算RC或RL LPF电路的单位
高通滤波器 - 计算RC或RL HPF电路的单位
欧姆定律 - 通过输入两个来转换电压，电流，电阻和功率
电抗 - 计算电容器或电感器的电抗
分贝计算器 - 在分贝值之间转换或通过输入功率或电压计算dB
分压器 - 计算一个电阻的输出电压或电阻
电阻颜色代码 - 通过输入频带的颜色来查找电阻的电阻
并联电阻 - 并联计算电阻的电阻
串联电阻器 - 计算串联电阻器的电阻
并联电容器 - 并联计算电容器的电容
串联电容器 - 计算串联电容器的电容
同轴电缆 - 计算同轴电缆的属性
摩尔斯电码
CW缩写
北约语音字母表

您可以升级到专业版以删除所有广告并获得以下功能：

半波同轴巴伦 - 计算给定频率的半波同轴巴伦的最佳长度
窄带巴伦 - 计算窄带巴伦的电感和电容
小磁环 - 计算给定频率的小磁环的最佳长度
全波环形天线 - 计算给定频率的全波环形天线的最佳长度
ERP和EIRP - 计算和转换ERP和EIRP
RMS电压 - 计算RMS电压
Pi衰减器 - 通过输入衰减和阻抗来计算电阻值
T衰减器 - 通过输入衰减和阻抗来计算电阻值
串联电感 - 计算串联电感的电感
并联电感 - 并联计算电感的电感
多普勒频移 - 计算多普勒频移


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