12-19-2019, 11:51 PM
"nothing to listen to on the very high shortwave band (23 to 60 mc)"
Here's a little FYI as I just learned a bit about this frequency band.
There is some interesting info on the "Apex" band if you google it. These high frequencies were being experimented with for HiFi. The FCC allowed a much wider bandwidth for better audio frequency response and less static. The McMurdo Silver Masterpiece V and VI went up to 70 mhz to take advantage of this. Other radios began to include these frequencies as well. At one time there were upwards of 50 stations broadcasting in this area. Transmission distance was thought to be line of sight like today's FM and so transmitting antennas were placed on high points, hence the name APEX band, and most stations were in high population areas. It only lasted a few years as FM supplanted the HiFi am stations. Most of the APEX band stations converted to FM fairly quickly. As Ron said, there's not much there now!
http://www.theradiohistorian.org/Apex/Apex1.htm
Here's a little FYI as I just learned a bit about this frequency band.
There is some interesting info on the "Apex" band if you google it. These high frequencies were being experimented with for HiFi. The FCC allowed a much wider bandwidth for better audio frequency response and less static. The McMurdo Silver Masterpiece V and VI went up to 70 mhz to take advantage of this. Other radios began to include these frequencies as well. At one time there were upwards of 50 stations broadcasting in this area. Transmission distance was thought to be line of sight like today's FM and so transmitting antennas were placed on high points, hence the name APEX band, and most stations were in high population areas. It only lasted a few years as FM supplanted the HiFi am stations. Most of the APEX band stations converted to FM fairly quickly. As Ron said, there's not much there now!
http://www.theradiohistorian.org/Apex/Apex1.htm
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