Here is what
might have been the first bicycle transmitter, a "breadboard"
model I built in 1938. I am shown
"tuning up" the rig, with two grade school friends looking on. I used a type 30
oscillator, another 30 for the modulator, and two 45 volt "B" batteries in
series. The antenna was my fishing rod.
I tuned the rig up on 1610, a clear spot just
above the broadcast band. Then I put a broadcast receiver on the frequency
at home so my mother could monitor and know where I was. I was
probably a little ahead of my time in the use of that frequency, which is
now used for highway information and weather conditions, along with
Bill Caldwell, W9ALM