Unfortunately this transmitter continues to be a piece of junk. It simply won't compete with commercial radio audio levels and I'm not sure why. I can achieve better results using an HLLY transmitter (set at 50 microseconds pre-emphasis) and just adding 25 in the audio. Plus, the HLLY allows RDS without affecting the sound. I wouldn't recommend the CZE-T501 to anyone. I would do some research and purchase something that's high quality.
One last thing I need to mess with is the adjustment (ADJ) on the back of the transmitter. Hopefully it's for adjusting the audio input levels.
The 6db attenuators did little to bring level down to an acceptable level..... The person I bought the T501 from sent a "factory note" and a picture showing the pre-emp mod described in an earlier post here.... A LOT of work involved just to change out 2 caps!!!!! I've got a Wavemach FM-25WM coming from Canada...."guaranteed" to be set @ 75uS pre-emphasis...and "custom tuned" to my freq. (91.9MHz)... Someday when I'm feeling brave.....I MAY attempt the T501 "lobotomy"!!!
I figured out that my issues were coming from running RDS and having a faint 19 KHz pilot tone present in the audio. This would create a ringing effect and cause havoc with the transmitter's limiter. I believe i can drive my sound louder now with out RDS. I don't understand why I'm able to hear the tone with this transmitter but not the other one.
