Total posts : 45366
There’s more than one type of Ramsey FM Transmitter and they are not all based on the same circuit. So far we do not know which one Tim might build.
The one I care about is the 25B FM Transmitter, because it is only a transmitter and doesn’t contain a bunch of other integrated sections, like a mixer and all that. I think the audio components should be separate from the transmitter.
The 25B Manual lists 88 to 10 MHz as the range, but sometimes there are “secret” unpublished settings that can get to out-of-band frequencies such as 87.9. Maybe someone can tell us.
BACK WITH MORE –
I paid a quick visit to the Ramsey site to see what they have…
FM10C is a play-toy transmitter with manual tuning, not recommended $47.95;
FM25B is my choice for stable, pro-quality, stereo FM transmitter $139.95;
FM30B is interesting. The description says it is a 25B circuit with added bells and whistles including a metal cabinet and front panel display. $199.95;
FM100B looks like a microwave oven/air cleaner and has a built in mixer. Hint: in the professional radio world no transmitters have built in mixers. I am told this transmitter is a different design than the 25B. $269.95.
The only other FM transmitters are 1 Watt for export only.