[AMRadio] Re: Converting old 1.8-4.0 MHz AM Marine Radios

Kim Elmore Kim.Elmore at noaa.gov
Thu Sep 9 18:31:34 EDT 2004

I don't have an answer for you, but this sparks a non-amateur boat-anchor 

I recently took (and passed) my Second Class radiotelegraph test. I did 
this simply because I wanted to, not because I ever expect to be a marine 
radio operator. And yes, the FCC still issues this otherwise dead license. 
I also passed the GROL with radar endorsement; I figured I might as well, 
while I'm at it.

Because I'm a 20-wpm-Extra, I was grandfathered for the CW element (20 wpm 
plain text, 16 wpm coded ciphers). The written test was pretty arcane, 
asking how to adjust a bug (I used one for years, so I know), how to handle 
traffic (did that on CW nets, so I had a clue), lots of non-amateur 
Q-signals, some oddball abbreviations mainly for radio direction finding, 
and finally a surprising amount of stuff about *regenerative receivers.*

Now, this last part got me to wondering: were regenerative receivers made 
and used commercially in shipboard service within living memory?  I know 
something about them only because my Dad (W5JHJ) and I built some when I 
was kid.  But, when were they produced commercially? And when were they 
used in commercial service? I can only guess that it was for a short time 
around the 1920's or so, but I may be way off. My Dad was amused by this, too.

Anyone have any good answers?

Kim Elmore, N5OP

                           Kim Elmore, Ph.D.
                        University of Oklahoma
         Cooperative Institute for Mesoscale Meteorological Studies
"All of weather is divided into three parts: Yes, No, and Maybe. The
greatest of these is Maybe" The original Latin appears to be garbled.

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