2017年3月31日 · USA AMATEURS GRANTED 630-METER BAND! On 27 March 2017, as part of Report and Order FCC 17-33, the FCC adopted the final rules for the USA 630-Meter band.

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 history, this frequency was referred to by its equivalent wavelength , 600 meters , or, using the earlier frequency unit name, 500 kilocycles (per second ...

2016年5月29日 · A number of the WD2XSH 500-kHz stations will be on the air on Thursday night, November 3 to mark the 105th anniversary of the Berlin treaty that made 500 kHz the International Distress Frequency. Stations operating in the band from 495 to 510 kHz will call CQ on 500 kHz and then QSY to complete the QSO.

2012年2月14日 · The next map shows the location of all reporters who have posted one or more reports on the 500KC.com web page. The remainder of the maps are arranged in ascending numerical order by WD2XSH station.

2006年3月28日 · Better known as 500 kilocycles, it was the spectrum reserved for ships and the shore stations that communicated with them in Morse Code (sometimes referred to as CW, for continuous wave). If you’re a real radio old-timer, you might refer to the frequency as 600 meters.

Bankovka pět set korun českých, tedy bankovka o hodnotě 500 Kč (lidově též pětistovka), je třetí nejnižší českou bankovkou. Na líci je známá česká spisovatelka Božena Němcová a květ růže, na rubu pak hlava dívky s kvítím a trním.

2021年3月30日 · Because of the steady stream of signals on 500 a weak station sending a distress message might not be heard. And at one time, calls AND traffic were passed on 500 - there was no shifting to working frequencies to pass messages. Thus silent periods were created.

2014年12月31日 · "QRT 500: The final WT transmissions from UK Coast Stations" A TRANSCRIPT is provided (or a Morse Libretto if you wish). A WWII map of UK Coast Stations drawn by R/O Jim Farrior, drawn in 1944 showing the existing coastal stations.

2021年3月31日 · Starting at about 2100 local 500 would come alive. Any ship or shore station within 3000-4000 miles could be heard by an excellent combination of ground wave and sky wave - nothing was missed within this radius! Shore stations of more than 5000 miles were easily copied (Australia and New Zealand boomed in nightly).

KC-500 STEREO MIXING KEYBOARD AMPLIFIER RATED POWER OUTPUT: Speaker Out: 150 W Phone Out: 90 mW + 90 mW (both channels 100 ohm...