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A strange problem solved...

O

OKCRadioGuy

I have a friend that has a small market cluster. His money-maker FM had an odd problem in that the stereo pilot would drop to 0% then all the way back up and cycle, etc. The multipath indicator on his mod monitor would do the same thing. How did we fix it? Well..... That's an interesting one indeed! Did you guys know that some of the RVR exciters have a freak'in stereo generator in them? This TEX-LCD sure does. And, it was turned on and fighting the Omnia's pilot. I was racking my brain trying to figure out why it was acting so odd, thinking it was a mismatch between the exciter and the transmitter or a stage. Heck no. The Italians outfoxed me. Since I wasn't the original installer of this thing I just had to keep looking and isolating until I figured it out. To be honest, I switched to the backup exciter and noticed it was perfectly fine, not exibiting the odd behavior. That's when I started looking further at the RVR and noticed the Stereo switch on the back. Just a word of warning on RVR stuff: You want to find that "STEREO" switch and turn it OFF for normal MPX(Composite) input operation. Its a simple fix, but certainly an odd one :)! The book doesn't really make a very good point of this....
 
It isn't just RVR. Several of the European exciters have stereo generators included.
 
Interesting... I'll have to keep that in mind when dealing with any of that stuff. At least now when I see that symptom I'll know right where to begin to look (if I didn't install it in the first place).
 
It happens, partiocularly if you're forgetful. We were doing HD mask compliance measurements the other night, and I couldn't get an unmodulated carrier. Killed the processor output, turned the exciter injection to zero, and disabled the RDS. Still got a tone from someplace. After a few minutes of headscratching, we remembered, the exciter (802D1) was set to fall back to the copmposite input if its silence sense timed out. Went and turned the pilot off on the backup processor, got a quiet carrier, and went about our business. The fallback was put in when the plant was built, had always worked flawlessly, and consequently had escaped everyne's mind. Gotcha!
 
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