Posted on July 14, 2011
Most of the AM medium wave transmitters for Part 15 low power do not use transformer modulation, with one exception being the Ramsey AM25 which has a small hand-wound transformer. But the shortwave transmitters on the blogs titled Talking Pixie2 and Big Talker got their start with a schematic that shows a small Radio Shack transformer, 8-ohms to 1K, with no stated power handling capacity. Even though that transformer does function, I checked around and found a Triad audio transformer with a rating of 1-Watt, which seemed more in line with the circuits being used. It remains to be tested.
Right now I am only interested in your point of view about low power, Part 15, modulation transformers simply as a topic of conversation.
In the adult-sized world of power radio, making a comparison, a plate modulation transformer for a 50kW station might way a ton or more.
Down here in micro-radio, what kind of power rating should a modulation transformer have?