Total posts : 45366
Thanks for all the help, but here is the issue again.
with the transmitter powered up and the rca NOT connected to the TX (on the TX side) its totally silent.. no hum..
When I plug in the audio RCA at the TX side, this is now seperated from the power lne, totally seperate line, that is no where near the power transmission line.. this gets hum..
I checked this line again and its wire correctly ground to ground and positve to positive..
The hum is always there even with the compression off..
The hum only stops when i unplug the audio RCA at the TX side.. if its plugged into or not into anything in the studio makes no diffrence.
I will try the two 9volts thing.. That will eliminate power supply issues.. But the odd thing is with the audio RCA at the TX disconnected its silent.. and the other odd thing is when i do connect that audio RCA line and pull it from the house the further I get away from the house the less the hum is in volume…further away i get teh lees it is. Thats really odd.
As for my settings, Im feeding the TX from my studio mixer, Its peeking right at zero DB.. The signal its self hooked to anything else sounds perfect.. absolutly no hum or interfierance. The signal in to the mixer is clean, the signal on headphones from the mixer is clean, the signal after the mixer is clean, the signal going into the encoding pc is clean, the signal comming from the encoding PC is clean on the studio monitors, and these monitors are ran off of a 12volt transformer that was on the same ccircuit as the tx power was on, before I moved it to a diffrent circuit..
I have two outputs on my mixer one that goes to the encoding PC for my internet broadcast, and the other goes to the TX.. both outputs are the same. My signal is compressed and limited by my automation system.. so I dont use any if a very small amount of compression at the TX, but even with it off the hum is still there, and not just slight its very notacable even when there is a loud piece of music or programming its always there. aleways constant.
The run is only about 30 foot long, right now the line runs 10 foot from my mixer to the window where it goes outside, down to ground leven and right now is just laying on the ground over to the TX,(abourt 20 feet) the line goes into the weather proof box, and into the TX audio jack, the joints that the RCAs are connected with are soldered and sealed with electrical tape.
My tx is set up according to the manual, like stated above, my actual settings are.. about 1/5th on the gain control, half on the modulation control, and the compression is off..
I have the trebble boost turned on on the TX, I messed with this, it didnt help.. I also messed witht he ground isolation jumers seeing if that made a diffrence.. no help there either.
Tomarrow I will pick up a ground loop isolator even though I dont think thats it.. Cant hurt I guess.