Total posts : 45366
I have read this website for a couple of years
(slowly, because I am legally blind.) I have
an SS-Tran for yardcasting but it is not on
I have enjoyed the wealth of knowledge and
info about part 15.
I had a Lafayette KT-195 am transmitter in
1968. It had no power transformer so it was
dangerous. It used a 36AM3B and 2 50BM8
tubes. It was “AC-DC.” It had a speaker
connection in the back, but the audio was way
too loud if you hooked on a speaker when you
were transmitting with “correct?” modulation.
It transmitted a mixture of am and fm, so you
had to sort-of slope detect the audio when were
trying to tune it in. When my best friend and
I built it, we made many mistakes. When my father
finally fixed it, we found that it was really transmitting
in the “marine band” at about 2.1 MHz.
The case was blue and grey, it had a slide switch in
the front along with the frequency adjust trimmer
that stuck out of the front panel. There was lots
of hum on the signal.
We also had another Lafayette transmitter, or
phono oscillator, as it was called. It was an open
chassis unit that had no power switch. It was
silver metallic in color. It used a 35W4 rectifier
and a 12BE6 that did all the real RF and audio
stuff. The tube heaters were series connected
through a gigantic wire wound resistor that ran
real hot. A ten foot green wire protruded out
the back. It was also AC-DC and very dangerous.
Having had very little luck with these units, the
part15 crowd in my neighborhood went to FM,
with a Radio Shack P-Box kit. The RF oscillator
in that was a 2N5223. If you google Radio Shack
P-Box, you might find a website about those kits,
because there used to be one out there.
All the above was in 1968. The Radio Shack kit
started getting used all over the country by kids
like us. It was too powerful and Radio Shack
removed it from the kit line.
I use my SS-Tran to transmit around the house.
Since I am legally blind, everything takes a long
time to do. Maybe someday I will build the
outside 3 meter antenna, but it is not on the
agenda right now. When it was on, it was on
1700 kHz. It was little operation, not a serious
part15 am station. My kids got a real kick out
of it. My wife didn’t think too much of it.
Radio has always been part of me and I have
loved reading this website. But you won’t hear
too much from me, because my vision is very
Thanks a lot for such a great website!