Bob Lear Jul 5 at 11:46 AM

Just in case you aren't wasting enough time on the internet, here are some interesting things I've found that I'll pass on for your perusal:

Indian Physicist J.C. Bose was using 60GHz before Marconi ever got started. In case you missed the link in the hackaday article, here is a very nice article from Darrel Emerson, AA7FV, that I have been reading over and over again over the years. Bose was a spectacular engineer: and

Also a comprehensive radio history paper from Darrell:

In the February 2016 QST, there is a nice article explaining how and why we use both wavelength and frequencies in referring to our ham bands. I learned something I didn't know before and was surprised that I hadn't ever tried to calculate with the formula waelength x frequency equals speed of light, or (lambda)f=c. (Can't do a lambda symbol in e-mail) Anyway, the surprise was that the only two ham bands that are actually "correct" with frequency and wavelength agreeing are 160m and 80m. The others are off enough that the wavelength numbers we use do NOT fall in the actual band of frequencies!! All above 160 and 80 are just rounded off. Didn't know that and never checked it. Good article and a recommended read. Also interesting to note that when they were allocated, all the ham bands were exactly HALF the previous in Wavelength. 160, 80, 40, 20, 10, 5, 2 1/2, 1 1/4. (The 15 meter band and the WARC bands came in later). Before WW2 the VHF bands were 5 instead of 6 and 2 1/2 instead of 2. 1 1/4 is still the same old 222(220) band.

Web SDR's available for free. Just do a google search for "sdr radio online" and you can listen to different radios all around the world for free. This might be the best deal of all. I listened to one on that worked good and also one on the website that should show up. Kind of interesting to listen to what the bands sound like on a receiver in Europe for example compared to what we might be able to hear here on the same frequency. I knew about them but really hadn't ever tried it out. Just listen through the PC speaker or headphones. I did a couple just now here on my computer and didn't have to do a thing except adjust the volume.


73 Bob W4ZST