Earlier on another thread there was mention of so many different transmitter manufacturers that I decided to start a new thread just for Transmitters so we can get this thing going. Please tell us rather or not the Transmitter has a certification and if so the FCC ID# if possible. Here is a start.
SainSonic AX-05B http://www.sainsonic.com/sainsonic-0-5w-long-range-10km-dual-mode-stereo-broadcast-fm-radio-transmitter-fashion-black.html
FCC Part 15 compliant FCC ID # 2ABT5AX05B7C Low Power -48dbM/500 mW (To adjust power hold down the power button while unit is unplugged then plug power in. Press Down arrow to switch to -48dbM or up arrow for 500mW Click power to confirm. You'll see the highest frequency 108Mhz click to confirm. Then you'll see lowest frequency 88.1 Mhz click power to confirm. Click again and transmitter will say OFF and the desplay will be dark. Now press power and select a blank frequency.
FM Stereo IC with PLL technology 75uS Audio pre emphasis, Limiter and Low Pass filter circuit. Large Digital display with blue backlight. Aluminum Enclosure. 88.1-107.9 Mhz US Factory setting or 76-108 Mhz outside USA. Tuning step 100Khz/0.1 Mhz. Power Supply 9-12 Volt DC (the current load of power supply should over 1A). Stability of frequency +- 0ppm (-10C +50C). Frequency Response 100-15000 Hz. Frequency to noise ratio >70db. Distortion <o.5%. Operation Time: True 24.7. Antenna Design: Rubber Antenna. Output Impedance 50 Ohm. Audio Input Connector: 3.5 mm headphone connector. Mic Input Connector: 3.5 mm headphone connector. Size of transmitter 113*88*38 mm. Transmission Signal: Stereo. Barrier free broadcast on 500mW setting 1,300 Feet (gray area in USA Note: I put that one in).
All specs were from the actually box the transmitter came in. Website says low power is 100mW but the actual transmitter when it arrived and I opened the package says low power is -48dbM (far less than 100mW). Again this is the revised transmitter with reverse threaded TNC connector.