Total posts : 45366
I recommend, if you are using a “certified” transmitter, you not make any modifications to the transmitter. If you do, the the unit is no longer under its certification and would be considered an experimental kit. There are no specific FCC rules I can point to to help you, but inspection case law is not in your favor.
The early models of Talking House transmitters were designed for “voice only” use. As such, the audio circuits have very limited bandpass (attenuated high and low frequency) and help process the audio for maximum intelligibility of the voice-range audio. Remember, the original Talking House units were used almost exclusively by real estate firms for open house tours.
Talking House was purchased by Radio Systems, Inc. and have redesigned the unit and its now called “iAM”. The new iAM transmitters (based on the TH design) have an audio circuit more suited to transmission of music and other program material. Link to company: http://www.iamradio.net/index.php