From early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) was an international calling and distress frequency for Morse code maritime communication. For much of its early …

Worldwide, thousands of human lives were saved by using the 500 kHz ( 600 metres) radio distress frequency and manually keyed maritime SOS distress signals. Without the special …

MFLI 的频率范围包括DC – 500 kHz 或DC – 5 MHz。 当需要时，还可使用MF-F5M 带宽升级选件将频率范围从500 kHz 扩展至5 MHz。 其他升级选件为MF-MD 多解调器、MF-IA 阻抗分析仪 …

The radio frequency of 500 kilohertz (500 kHz) had been an international calling and distress frequency for Morse code maritime communication since early in the 20th century. For most of …

2006年3月28日 · For almost a century, 500 kHz was a lifeline for ships worldwide. Better known as 500 kilocycles, it was the spectrum reserved for ships and the shore stations that …

2010年3月23日 · The countries who have granted 500 kHz experimental privileges are the United States, Sweden, Germany, the Czech Republic, the United Kingdom, Belgium, Canada, …

2024年6月18日 · Depending on the specific model and configuration, the RTL-SDR can typically cover frequencies from 500 kHz to 1.75 GHz. Here’s a detailed frequency list showing what …

Convert between frequency units easily with our free online frequency converter. Transform Hz, kHz, MHz, GHz, rad/s and more. Accurate and instant frequency unit conversion.

2012年2月14日 · JUMA TX500 is a versatile building block for 500 kHz, it includes antenna switching for RX and it can be connected to any 500 kHz receiver. TX500 will enhance your …

2006年4月27日 · 555 timers are available from several different manufacturers in several different versions. Some of the data sheets show a chart going up to 100KHz but don't specify and …