OK, so I've been fighting not one, but two different modulators to provide an analog carrier at 859.25 MHz, (EIA 135). We've been doing this for a couple of years, in order that it will provide a reference for setting up nodes, amplifiers, and finding roll-off. The problem is this: Both modulators, (one is a GI C6M-II, the other a Standard TVM-860), both have stability issues; wherein they will jump around on the output levels, (this having been verified by three meters connected simultaniously), anywhere from .5 dB to an astounding 2 dB. The Standard is far worse than the GI, it continuously jumped all over by as much as 2 dB. The GI, is better; about .5 dB. I've set both to max output, backed of by three dB, then pad the output at the combiner, (utilizing PCI MaxNet gear with a JXP-* pad). Any thoughts on why this is?
-Doc
? Regarding the use of an analog carrier @ 859MHZ
Member #: 57427
Registered: 2/17/2008
Posted:
1
Name:
Doc
Company:
Bresnan
Occupation:
Engineer
Location:
Right here.
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